LG MX8550 Service Manual Download Page 86

Page: 86 / 190

- 85/148 -

LG Electronics Inc.

X8550

Checking Flow

Waveform

RF_OUT

RF_IN fed up with CW signal

in low gain mode of PAM

Figure 4.2.2.6

Check pin6, 8 at U107

Check if there is any major difference referring

To Figure 4.2.2.6. Is it similar?

Start

PAM circuit is OK. See next page

YES

Replace U107

YES

Check pin4, 12 at U107(Vcc)

whether it is higher than 3.4V.

Check Vcc line

YES

Check pin3 at U107(PA_R1 signal)

whether it is lower than 2.2V.

Check PA_R1 line

YES

Check pin7 at U107(PA_R1 signal)

whether it is higher than 2.2V.

Check PA_ON line

YES

Z3X-BOX.COM

Summary of Contents for MX8550

Page 1: ...luded 0 25W 400mA 4 2V AWT6321R PCS 0 25W 400mA 4 2V AWT6321R CELLULAR Power Current Voltage Part Name MODE 6 Functions of Major Semi Conductors Converts baseband signal to Tx RF signal RFT6150 Converts Rx RF signal to baseband signal RFR6500 Flash Memory 1024Mbit SDRAM 512Mbit Storing of terminal operation program Memory MCP TY9000A000BMGF Terminal operation control and digital signal processing ...

Page 2: ... 1 148 LG Electronics Inc MX8550 CDMA Mobile Subscriber Unit MX8550 SERVICE MANUAL SERVICE MANUAL DUAL BAND CDMA PCS Cellular w GPS CDMA MOBILE PHONE Z 3 X B O X C O M ...

Page 3: ...ucture and Functions of Dual band CDMA Mobile Phone 8 4 Specification 9 5 Installation 14 CHPATER 2 NAM Input Method 1 NAM Program Method and Telephone Number Inputting Method 16 CHAPTER 3 Circuit Description 1 RF Transmit Receive Part 26 2 Digital Voice Processing Part 32 CHAPTER 4 Trouble Shooting 37 CHAPTER 5 Safety 133 CHAPTER 6 Glossary 136 APPENDIX 148 Z 3 X B O X C O M ...

Page 4: ...le users in the same specific area resulting that it increases the capacity 10 times more compared with that in the analog mode currently used Soft Softer Handoff Hard Handoff and Dynamic RF power Control technologies are combined into this phone to reduce the call being interrupted in a middle of talking over the phone Cellular and PCS CDMA network consists of MSO Mobile Switching Office BSC Base...

Page 5: ...gy under the interference limited environment It can process more number of subscribers compared to other systems TDMA system has the processing capacity three times greater than the existing FDMA system whereas CDMA system about 12 15 times of that of the existing system CDMA system can be explained as follows TDMA or CDMA can be used to enable each person to talk alternately or provide a separat...

Page 6: ... power control on all the mobile stations the system capacity can be maximized If the signal power of mobile station is received too strong the performance of that mobile station is improved However because of this the interference on other mobile stations using the same channel is increased and accordingly the call quality of other subscribers is reduced unless the maximum accommodation capacity ...

Page 7: ...A signals and as a result improve system performance capacity increased by about two times 2 4 Protecting Call Confidentiality Voice privacy is provided in the CDMA system by means of the private long code mask used for PN spreading Voice privacy can be applied on the traffic channels only All calls are initiated using the public long code mask for PN spreading The mobile station user may request ...

Page 8: ...imes 2 7 Soft Capacity The subscriber capacity of the CDMA system is flexible depending on the relation between the number of users and service classes For example the system operator can increase the number of channels available for use during the busy hour despite the drop in call quality This type of function requires 40 of normal call channels in the standby mode during the handoff in an effor...

Page 9: ...tio The carrier wave of pilot channel from the cell site most adjacently located is demodulated in order to obtain the sequence of encoded data symbols During the operation with one cell site the searcher searches out multi paths in accordance with terrain and building reflections On three data receivers the most powerful 3 paths are allocated for the parallel tracing and receiving Fading resistan...

Page 10: ...A 1 1 mA CELLULAR MAX POWER IDLE SLEEP 4 1 5 Operating Temperature 0 C 60 C 4 1 6 Frequency Stability 1 CDMA 0 5PPM 2 PCS 0 1PPM 4 1 7 Antenna Stubby Type Helical 50 4 1 8 Size and Weight 1 Size 98 7 H 47 8 W 17 4 D mm 2 Weight 107 g Approximately with standard battery 4 1 9 Channel Spacing 1 CELLULAR 1 25MHz 2 PCS 1 25 MHz 4 1 10 Battery Type Capacity and Operating Time Unit Hours Minutes 140 Min...

Page 11: ... 4 Selectivity CELLULAR 3dB C N Degration With Fch 1 25 kHz 30dBm PCS 3dB C N Degration With Fch 1 25 kHz 30dBm 4 2 5 Spurious Wave Suppression Maximum of 80dB 4 2 6 CDMA Input Signal Range Dynamic area of more than 104 25 dB 79dB at the 1 23MHz band 4 3 Transmit Specification 4 3 1 Frequency Range CELLULAR 824 820MHz 848 190MHz PCS 1850 MHz 1910 MHz 4 3 2 Output Power CELLULAR 0 224W PCS 0 224W 4...

Page 12: ... 837 120 838 350 839 580 840 810 842 040 843 270 844 500 845 910 847 140 848 370 404 445 486 527 568 609 650 697 738 779 824 640 825 870 827 100 828 330 829 560 830 790 832 020 833 250 834 480 835 890 1011 29 70 111 152 193 234 275 316 363 Center Freq MHz Ch Center Freq MHz Ch 4 4 2 PCS mode 1898 75 975 1878 75 575 1858 75 175 1897 50 950 1877 50 550 1857 50 150 1896 25 925 1876 25 525 1856 25 125...

Page 13: ...889 500 890 910 892 140 893 370 404 445 486 527 568 609 650 697 738 779 869 640 870 870 872 100 873 330 874 560 875 790 877 020 878 250 879 480 880 890 1011 29 70 111 152 193 234 275 316 363 Center Freq MHz Ch Center Freq MHz Ch 4 5 2 PCS mode 1981 25 1025 1961 25 625 1941 25 225 1980 00 1000 1960 00 600 1940 00 200 1978 75 975 1958 75 575 1938 75 175 1977 50 950 1957 50 550 1937 50 150 1976 25 92...

Page 14: ... 350 1986 25 1125 1966 25 725 1946 25 325 1985 00 1100 1965 00 700 1945 00 300 1983 75 1075 1963 75 675 1943 75 275 1982 50 1050 1962 50 650 1942 50 250 4 5 3 GPS mode 1575 42 MHz 4 5 4 Bluetooth mode 2400 MHz 2483 5 MHz 4 6 AC Adaptor See Appendix 4 7 Cigar Lighter Charger See Appendix Z 3 X B O X C O M ...

Page 15: ...erous distance from the speaker 5 3 2 Cradle Installation Choose an appropriate flat surface where the unit will not interface with driver s movement or passenger s comfort The driver user should be able to access the phone with ease Using the four self tapping screws provided mount the supplied bracket on the selected area Then with the four machine screws provided mount the counterpart on the re...

Page 16: ...n wire to the car ignition sensor terminal In order to operate HFK please make sure to connect green wire to ignition sensor terminal Connect the kit s power cable connector to the interface box power receptacle 5 3 5 2 Antenna Cable Connection Connect the antenna coupler cable connector from the cradle to the external antenna connector Antenna is not included Z 3 X B O X C O M ...

Page 17: ...ng Method 1 Press 77647268550 SEND and then press 000000 2 Press 1 key for entering Service Prg Usually pressing soft key will save the change To exit service program press END key 3 MEID ESN You can see the MEID ESN number Press softkey OK Message key to edit more NAM1 items Press softkey Exit Contacts to exit Service Programming Z 3 X B O X C O M ...

Page 18: ...s 5 NAM1 Phone Number MIN You can edit the NAM1 Phone Number MIN Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items 6 NAM1 Home SID You can edit the NAM1 Home SID Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Z 3 X B O X C O M ...

Page 19: ...e NAM1 Programming You can decide to edit more NAM1 Name Press softkey OK Message key to exit Service Programming Press softkey More Contacts to edit more advanced NAM1 items 9 Service Code You can edit Service Code Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Z 3 X B O X C O M ...

Page 20: ...NAM1 items 11 NAM1 NMSID You can edit NAM1 NMSID Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items 12 NAM1 True IMSI MCC You can edit NAM1 True IMSI MCC Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Z 3 X B O X C O M ...

Page 21: ...s 14 NAM1 PRL Enabled You can see NAM1 PRL Enabled Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items 15 CDMA Home SID NID You can edit NAM1 Home SID NID pair Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Z 3 X B O X C O M ...

Page 22: ...CDMA Sec CH A You can edit NAM1 CDMA Secondary Channel A Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items 18 NAM1 CDMA Pri CH B You can edit NAM1 CDMA Primary Channel B Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Z 3 X B O X C O M ...

Page 23: ... can edit Lockout SID NID pair Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items 21 NAM1 Home Sys Reg You can edit NAM1 Home System Registration Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Press Left Right Up Down key to toggle Yes No Z 3 X B O X C O M ...

Page 24: ...AM1 Forn NID Reg You can edit NAM1 Foreign NID Registration Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Press Left Right Up Down key to toggle Yes No 24 NAM1 ACC Ovld Class You can edit NAM1 Access Overload Class Press softkey OK Message key to edit more NAM1 items Press softkey Back Contacts to edit previous NAM1 items Z 3 X B O X C...

Page 25: ...elated items 26 Phone Model You can see the Phone Model Number Press softkey OK Message key to edit more items Press softkey Back Contacts to edit previous items 27 Slot Cycle Index You can edit Slot Cycle Index Press softkey OK Message key to save Slot Cycle Index Press softkey Back Contacts to edit previous items Z 3 X B O X C O M ...

Page 26: ...Restart Z 3 X B O X C O M ...

Page 27: ...nal directly Then this signal is changed into digital signal by the analog to digital converter ADC A D Converter and the digital circuit part of the MSM Mobile Station Modem 6500 processes the data from ADC The digital processing part is a demodulator In the case of transmission RFT6150 receives OQPSK modulated analog signal from the MSM6500 The RFT6150 connects directly with MSM6500 using an ana...

Page 28: ...Dist PLL1 LO Gen Dist PLL0 Diversity Rx VCO CDMA VCOs F ref F ref GPS VCO Digital I Os Controls Diversity Rx VCO Dual BPF GPS BPF Primary Path Secondary Path HDET RFT6150 RFR6500 Tx Rx Tx Rx Diplexer B7839 PCS Duplexer DCN Duplexer CDMA Antenna GPS Antenna CDMA RF connector GPS RF connector DCN BPF PCS BPF DCN PCS DCN Coupler F ref Loop Filter for CDMA Tx Buffer TCXO Loop Filter for CDMA Rx Loop F...

Page 29: ...mmon antenna The TX part BPF is used to suppress noises and spurious out of the TX frequency band The RX BPF is used to receive only RX signal coming from the antenna which is usually called preselector It s main function is to limit the bandwidth of spectrum reaching the LNA and mixer attenuate receiver spurious response and suppress local oscillator energy As a result frequency sensitivity and s...

Page 30: ... Cellular PCS Cellular Units High gain Middle gain Low gain Parameter 1 2 4 GPS LNA U104 The characteristics of Low Noise Amplifier LNA are low noise figure high gain high intercept point and high reverse isolation The frequency selectivity characteristic of mobile phone is mostly determined by LNA The specification of VX8550 GPS LNA is described below dBm 4 7 IIP3 dBm 1 8 1dB compression point dB...

Page 31: ...lar PCS Cellular Units High gain Low gain Parameter 1 3 Description of Transmit Part Circuit 1 3 1 RFT6150 U111 The RFT6150 Base band to RF Transmit Processor performs all TX signal processing functions required between digital Base band and the Power Amplifier Modulator PAM The Base band quadrate signals are up converted to the Cellular or PCS frequency bands and amplified to provide signal drive...

Page 32: ...oing through the AlGaAs GaAs HBT heterojunction bipolar transistor process The module of power amplifier is made up of an output end interface circuit including this MMIC The maximum power that can be inputted through the input terminal is 10dBm and conversion gain is about 26 5dB RF transmit signals that have been amplified through the power amplifier are sent to the duplexer 1 4 Description of F...

Page 33: ...al sources 2 2 2 Voice Processing Part The voice processing part is made up of an audio codec used to convert MIC signals into digital voice signals and digital voice signals into analog voice signals amplifying part for amplifying the voice signals and sending them to the ear piece amplifying part that amplifies ringer signals coming out from MSM6500 and amplifying part that amplifies signals com...

Page 34: ...at includes ARM926EJ S microprocessor core It supports both CDMA and Digital FM operating in both the cellular and PCS spectrums The subsystems within the MSM6500 include a CDMA processor a DFM processor a multi standard Vocoder an integrated CODEC with earpiece and microphone amplifiers general purpose ADC for subsystem monitoring an ARM926EJ S microprocessor and an RS 232 serial interfaces suppo...

Page 35: ...ass Boost Noise Gate Digital Equalizer 10 Band Band Expander Compressor Karaoke Voice Pitch Change Audio Engine DSP Dynamic Range Control DRC 8 48kHz rate 16bit Stereo 192kHz sampling frequency DAC Stereo HP amp Mono Digital Speaker amp Class D Non clip by S W 700mW 16bit 8bit Wheel Light I2C B Register MAX 9722B CODEC YMU 800 To MSM Voice Call To CODEC Recording flix MIC MIC IN Mono A IN Stereo C...

Page 36: ...e MSM6500 receives TCXO 19 2MHz from the X100 and controls the phone in CDMA modes The major components are as follows CPU The ARM926J S microprocessor includes a 3 stage pipelined RISC architecture both 32 bit ARM and 16 bit THUMB instruction sets a 32 bit address bus and a 32 bit internal data bus It has a high performance and low power consumption MCP NAND Flash is used to store the terminal s ...

Page 37: ...internal register setting sensor supplies YUV422 image data synchronous signal and pixel clock synchronized with pixel of image data to DSP VSYNC is a synchronized signal to differentiate frames and HREF is a synchronized signal to differentiate lines These signals are synchronized with the pixel clock Input image data through the sensor interface is previewed on the LCD up to 30fps through the IM...

Page 38: ... W Diplexer DCN_Duplexer RFR6500 VCTCXO Check flow Check flow 1 Check DC Power Supply circuit 2 Check VCTCXO Rx TEST SETUP HHP Test Channel 384 Test Band US Cellular SID 2004 Sector Power 30 dBm Spectrum Analyzer Setting Oscilloscope Setting Start 3 Check Control signal Redownload S W Cal NO 4 Check RF Signal path 5 Check Rx I Q data Z 3 X B O X C O M ...

Page 39: ... 38 148 LG Electronics Inc MX8550 4 1 1 1 Checking DC Power supply circuit PMIC R328 R330 Test Point Test Point Circuit Diagram Circuit Diagram TP1 TP2 Z 3 X B O X C O M ...

Page 40: ... R330 2 9V_RX is OK Check R328 2 6V_MSMP2 is OK YES Start DC Power supply Circuit is OK See next Page to check VCTCXO circuit The Problem may be Logic part Refer to Logic troubleshoot The Problem may be Logic part Refer to Logic troubleshoot NO NO YES Z 3 X B O X C O M ...

Page 41: ... 40 148 LG Electronics Inc MX8550 4 1 1 2 Checking VCTCXO circuit X100 pin3 X100 pin4 Test Point Test Point Circuit Diagram Circuit Diagram TP1 TP2 Z 3 X B O X C O M ...

Page 42: ...gure 4 1 1 a NO Start Replace Main B D VCTCXO circuit is Ok See next page to check control signal The Problem may be Logic part Refer to Logic troubleshoot YES NO NO Check X100 pin4 Is it 2 8V Refer to figure 4 1 1 b Replace X100 and then check C152 R107 YES Is it similar VCTCXO circuit is Ok See next page to check control signal YES Z 3 X B O X C O M ...

Page 43: ... 42 148 LG Electronics Inc MX8550 4 1 1 3 Checking Control signal Test Point Test Point Circuit Diagram Circuit Diagram U110 pin49 SBST0 pin50 SBDT0 pin51 SBCK0 Z 3 X B O X C O M ...

Page 44: ...f there is any major difference referring To Figure 4 1 1 c d Start Control signal is Ok See next page to check RF signal path YES NO Redownload S W NO Check pin49 50 51 at U110 Check if there is any major difference referring To Figure 4 1 1 c d Control signal is Ok See next page to check RF signal path YES Replace Main B D Z 3 X B O X C O M ...

Page 45: ...1 4 Checking RF signal path Mobile S W Diplexer Duplexer U10 1 Pin2 L117 C126 L125 C136 F105 Pin6 DP100 Pin3 L104 L139 C103 L103 Test Point Test Point Circuit Diagram Circuit Diagram PCS Tx DCN Tx PCS Rx DCN Rx TP1 TP2 TP3 Z 3 X B O X C O M ...

Page 46: ... detected at that point Check C103 L103 NO Check pin6 at F105 Check if there is any major difference referring To Figure 4 1 1 f Is any signal detected at that point YES Replace F105 NO YES Is any signal detected at that point Check L104 L139 NO Check pin3 at DP100 Check if there is any major difference referring To Figure 4 1 1 g Is any signal detected at that point YES Replace DP100 NO YES Is an...

Page 47: ... 46 148 LG Electronics Inc MX8550 Waveform Waveform 4 1 1 e 4 1 1 f 4 1 1 g U101 pin2 F105 pin6 DP100 pin3 Z 3 X B O X C O M ...

Page 48: ... 47 148 LG Electronics Inc MX8550 Test Point Test Point Circuit Diagram Circuit Diagram 4 1 1 5 Checking Rx I Q data U110 Pin7 RX0_QM Pin8 RX0_QP Pin9 RX0_IM Pin10 RX0_IP Z 3 X B O X C O M ...

Page 49: ...10 at U110 Check if there is any major difference referring To Figure 4 1 1 h i Start Replace U 110 YES NO Redownload S W and then recalibrate the Main B D NO Check pin7 8 9 10 at U110 Check if there is any major difference referring To Figure 4 1 1 h i Replace Main B D YES All DCN Rx check is completed If the phone still do not work change Main B D Z 3 X B O X C O M ...

Page 50: ...Checking Flow Checking Flow 1 Check DC Power Supply circuit 2 Check VCTCXO Rx TEST SETUP Joyphone Test Channel 675 Test Band US PCS SID 4182 Sector Power 30 dBm Spectrum Analyzer Setting Oscilloscope Setting Start 3 Check Control signal Redownload S W Cal NO 4 Check RF Signal path 5 Check Rx I Q data Z 3 X B O X C O M ...

Page 51: ... 50 148 LG Electronics Inc MX8550 4 1 2 1 Checking DC Power supply circuit PMIC R328 R330 Test Point Test Point Circuit Diagram Circuit Diagram TP1 TP2 Z 3 X B O X C O M ...

Page 52: ... R330 2 9V_RX is OK Check R328 2 6V_MSMP2 is OK YES Start DC Power supply Circuit is OK See next Page to check VCTCXO circuit The Problem may be Logic part Refer to Logic troubleshoot The Problem may be Logic part Refer to Logic troubleshoot NO NO YES Z 3 X B O X C O M ...

Page 53: ... 52 148 LG Electronics Inc MX8550 4 1 2 2 Checking VCTCXO circuit X100 pin3 X100 pin4 Test Point Test Point Circuit Diagram Circuit Diagram TP1 TP2 Z 3 X B O X C O M ...

Page 54: ...gure 4 1 1 a NO Start Replace Main B D VCTCXO circuit is Ok See next page to check control signal The Problem may be Logic part Refer to Logic troubleshoot YES NO NO Check X100 pin4 Is it 2 8V Refer to figure 4 1 1 b Replace X100 and then check C152 R107 YES Is it similar VCTCXO circuit is Ok See next page to check control signal YES Z 3 X B O X C O M ...

Page 55: ... 54 148 LG Electronics Inc MX8550 4 1 2 3 Checking Control circuit Test Point Test Point Circuit Diagram Circuit Diagram U110 pin49 SBST0 pin50 SBDT0 pin51 SBCK0 Z 3 X B O X C O M ...

Page 56: ...f there is any major difference referring To Figure 4 1 1 c d Start Control signal is Ok See next page to check RF signal path YES NO Redownload S W NO Check pin49 50 51 at U110 Check if there is any major difference referring To Figure 4 1 1 c d Control signal is Ok See next page to check RF signal path YES Replace Main B D Z 3 X B O X C O M ...

Page 57: ...in2 C135 C127 L126 C134 F105 Pin4 DP101 Pin3 C185 L140 L106 C103 L103 Test Point Test Point Circuit Diagram Circuit Diagram 4 1 2 4 Checking RF signal path Mobile S W Diplexer Duplexer PCS Tx DCN Tx PCS Rx DCN Rx TP1 TP2 TP3 Z 3 X B O X C O M ...

Page 58: ... detected at that point Check C103 L103 NO Check pin6 at F105 Check if there is any major difference referring To Figure 4 1 1 f Is any signal detected at that point YES Replace F105 NO YES Is any signal detected at that point Check L104 L139 NO Check pin3 at DP101 Check if there is any major difference referring To Figure 4 1 1 g Is any signal detected at that point YES Replace DP101 NO YES Is an...

Page 59: ... 58 148 LG Electronics Inc MX8550 Waveform Waveform U101 Pin 2 F105 Pin 4 DP101 Pin 2 Z 3 X B O X C O M ...

Page 60: ... 59 148 LG Electronics Inc MX8550 Test Point Test Point Circuit Diagram Circuit Diagram 4 1 2 5 Checking Rx I Q data U110 Pin7 RX0_QM Pin8 RX0_QP Pin9 RX0_IM Pin10 RX0_IP Z 3 X B O X C O M ...

Page 61: ...10 at U110 Check if there is any major difference referring To Figure 4 1 1 h i Start Replace U 110 YES NO Redownload S W and then recalibrate the Main B D NO Check pin7 8 9 10 at U110 Check if there is any major difference referring To Figure 4 1 1 h i Replace Main B D YES All DCN Rx check is completed If the phone still do not work change Main B D Z 3 X B O X C O M ...

Page 62: ...uit 2 Check VCTCXO Press 5473784236368 SEND key 000000 in Phone idle state Press 5 to enter FCC Test Press 2 to enter CDMA FCC mode Set channel to 384 and AGC to 360 Measure frequency domain waveform with Spectrum analyser Measure time domain waveform with Oscilloscope Start 6 Check Duplexer Redownload S W Cal NO 7 Check Diplexer 8 Check Mobile Switch 3 Check RFT6150 5 Check RF Dual PAM 4 Check RF...

Page 63: ... 62 148 LG Electronics Inc MX8550 4 2 1 1 Checking DC Power supply circuit PMIC Test Point Test Point Circuit Diagram Circuit Diagram R328 R333 TP1 TP2 Z 3 X B O X C O M ...

Page 64: ... R333 2 9V_TX is OK Check R328 2 6V_MSMP2 is OK YES Start DC Power supply Circuit is OK See next Page to check VCTCXO circuit The Problem may be Logic part Refer to Logic troubleshoot The Problem may be Logic part Refer to Logic troubleshoot NO NO YES Z 3 X B O X C O M ...

Page 65: ... 64 148 LG Electronics Inc MX8550 4 2 1 2 Checking VCTCXO circuit X100 pin3 X100 pin4 Test Point Test Point Circuit Diagram Circuit Diagram TP1 TP2 Z 3 X B O X C O M ...

Page 66: ...gure 4 1 1 a NO Start Replace Main B D VCTCXO circuit is Ok See next page to check control signal The Problem may be Logic part Refer to Logic troubleshoot YES NO NO Check X100 pin4 Is it 2 8V Refer to figure 4 1 1 b Replace X100 and then check C152 R107 YES Is it similar VCTCXO circuit is Ok See next page to check control signal YES Z 3 X B O X C O M ...

Page 67: ...1 3 Checking RFT6150 circuit Test Point Test Point U111 PIN23 TX_ON SBCK0 SBDT0 SBST0 TCXO TX_QP CELL_OUT TX_QM TX_IM PIN15 PIN 27 PIN 28 PIN 29 PIN 30 TX_IP PIN 1 2 3 4 Circuit Diagram Circuit Diagram TP1 TP2 TP3 TP4 TP5 Z 3 X B O X C O M ...

Page 68: ... Q data at U111 Check if there is any major difference referring To Figure 4 2 1 4 b Is it similar Check U204 MSM6500 NO YES Check pin1 at U111 TX_ON signal whether it is higher than 2 5V Check TX_ON signal MSM NO Check pin2 3 4 at U111 referring To Figure 4 2 1 4 d Is it similar YES Check SBI signal line MSM NO YES Check pin15 at U111 TCXO signal referring to Figure 4 2 1 4 b Is it similar Check ...

Page 69: ... 68 148 LG Electronics Inc MX8550 Graph 4 2 1 4 B Graph 4 2 1 4 A Graph 4 2 1 4 C Graph 4 2 1 4 D RX_Q_P RX_I_N SBD T SBS T SBC K SBC K RX_I_P RX_Q_N Waveform Waveform Z 3 X B O X C O M ...

Page 70: ... Circuit Diagram Circuit Diagram RF_OUT RF_IN F104 Checking Flow Checking Flow RF_IN RF_OUT Waveform Waveform Figure 4 2 1 5 RF_IN fed up with CW signal TP1 TP2 Check pin1 3 at F104 Referring to Figure 4 2 1 5 Is it similar Start Replace F 104 RF Tx SAW is OK YES NO Z 3 X B O X C O M ...

Page 71: ...48 LG Electronics Inc MX8550 4 2 1 5 Check DCN PAM circuit Test Point Test Point Circuit Diagram Circuit Diagram RFIN_CELL VBATT RFOUT_CELL VMODE VEN_CELL VCCA PCS Tx DCN Tx TP1 TP2 TP3 TP4 Z 3 X B O X C O M ...

Page 72: ... 4 2 1 6 Check pin2 13 at U107 Check if there is any major difference referring To Figure 4 2 1 6 Is it similar Start PAM circuit is OK See next page YES Replace U107 YES Check pin4 11 at U107 Vcc whether it is higher than 3 4V Check Vcc line NO YES Check pin3 at U107 PA_R1 signal whether it is lower than 2 2V Check PA_R1 line NO YES Z 3 X B O X C O M ...

Page 73: ...est Point Circuit Diagram Circuit Diagram ANT_PORT TX_PORT DP100 Checking Flow Checking Flow Waveform Waveform Figure 4 2 1 7 Tx Port ANT Port TP1 TP2 Check pin1 3 at DP101 Referring to Figure 4 2 2 7 Is it similar Start Replace DP 101 Duplexer is OK YES NO Z 3 X B O X C O M ...

Page 74: ...t F105 Ant Port DCN Port Circuit Diagram Circuit Diagram Checking Flow Checking Flow Waveform Waveform DCN Port ANT Port PCS Tx DCN Tx PCS Rx DCN Rx TP1 TP2 Check pin2 4 at F105 Referring to Figure 4 2 2 8 Is it similar Start Replace F 105 Diplexer is OK YES NO Z 3 X B O X C O M ...

Page 75: ...oint Test Point Circuit Diagram Circuit Diagram Checking Flow Checking Flow Waveform Waveform RF OUT RF IN Figure 4 2 1 9 RF IN RF OUT TP1 TP2 Check pin1 2 at U101 Referring to Figure 4 2 1 9 Is it similar Start Replace F 105 Mobile S W is OK YES NO Z 3 X B O X C O M ...

Page 76: ...it 2 Check VCTCXO Press 5473784236368 SEND key 000000 in Phone idle state Press 5 to enter FCC Test Press 2 to enter PCS FCC mode Set channel to 600 and AGC to 360 Measure frequency domain waveform with Spectrum analyser Measure time domain waveform with Oscilloscope Start 6 Check Duplexer Redownload S W Cal NO 7 Check Diplexer 8 Check Mobile Switch 3 Check RFT6150 5 Check RF Dual PAM 4 Check RF S...

Page 77: ... 76 148 LG Electronics Inc MX8550 4 2 2 1 Checking DC Power supply circuit PMIC Test Point Test Point Circuit Diagram Circuit Diagram R328 R333 TP1 TP2 Z 3 X B O X C O M ...

Page 78: ... R333 2 9V_TX is OK Check R328 2 6V_MSMP2 is OK YES Start DC Power supply Circuit is OK See next Page to check VCTCXO circuit The Problem may be Logic part Refer to Logic troubleshoot The Problem may be Logic part Refer to Logic troubleshoot NO NO YES Z 3 X B O X C O M ...

Page 79: ... 78 148 LG Electronics Inc MX8550 4 2 2 2 Checking VCTCXO circuit X100 pin3 X100 pin4 Test Point Test Point Circuit Diagram Circuit Diagram TP1 TP2 Z 3 X B O X C O M ...

Page 80: ...gure 4 1 1 a NO Start Replace Main B D VCTCXO circuit is Ok See next page to check control signal The Problem may be Logic part Refer to Logic troubleshoot YES NO NO Check X100 pin4 Is it 2 8V Refer to figure 4 1 1 b Replace X100 and then check C152 R107 YES Is it similar VCTCXO circuit is Ok See next page to check control signal YES Z 3 X B O X C O M ...

Page 81: ... 2 3 Checking RFT6150 circuit Test Point Test Point U111 PIN21 TX_ON SBCK0 SBDT0 SBST0 TCXO TX_QP PCS_OUT TX_QM TX_IM PIN15 PIN 27 PIN 28 PIN 29 PIN 30 TX_IP PIN 1 2 3 4 Circuit Diagram Circuit Diagram TP1 TP2 TP3 TP4 TP5 Z 3 X B O X C O M ...

Page 82: ... Q data at U111 Check if there is any major difference referring To Figure 4 2 2 4 b Is it similar Check U204 MSM6500 NO YES Check pin1 at U111 TX_ON signal whether it is higher than 2 5V Check TX_ON signal MSM NO Check pin2 3 4 at U111 referring To Figure 4 2 2 4 d Is it similar YES Check SBI signal line MSM NO YES Check pin15 at U111 TCXO signal referring to Figure 4 2 2 4 b Is it similar Check ...

Page 83: ... 82 148 LG Electronics Inc MX8550 Graph 4 2 2 4 B Graph 4 2 2 4 A Graph 4 2 2 4 C Graph 4 2 2 4 D RX_Q_P RX_I_N SBD T SBS T SBC K SBC K RX_I_P RX_Q_N Waveform Waveform Z 3 X B O X C O M ...

Page 84: ... Circuit Diagram Circuit Diagram Checking Flow Checking Flow RF_IN RF_OUT Waveform Waveform Figure 4 2 2 5 RF_IN fed up with CW signal RF_IN RF_OUT F103 TP1 TP2 Check pin1 4 at F103 Referring to Figure 4 2 2 5 Is it similar Start Replace F 103 RF Tx SAW is OK YES NO Z 3 X B O X C O M ...

Page 85: ... 148 LG Electronics Inc MX8550 4 2 2 5 Check DCN PAM circuit Test Point Test Point Circuit Diagram Circuit Diagram RFIN_PCS VBATT RFOUT_PCS VMODE VEN_PCS VCC PCS Tx DCN Tx TP1 TP2 TP3 TP4 Z 3 X B O X C O M ...

Page 86: ...s any major difference referring To Figure 4 2 2 6 Is it similar Start PAM circuit is OK See next page YES Replace U107 YES Check pin4 12 at U107 Vcc whether it is higher than 3 4V Check Vcc line NO YES Check pin3 at U107 PA_R1 signal whether it is lower than 2 2V Check PA_R1 line NO YES Check pin7 at U107 PA_R1 signal whether it is higher than 2 2V Check PA_ON line NO YES Z 3 X B O X C O M ...

Page 87: ...est Point Circuit Diagram Circuit Diagram ANT_PORT TX_PORT DP101 Checking Flow Checking Flow Waveform Waveform Figure 4 2 2 7 Tx Port ANT Port TP1 TP2 Check pin1 3 at DP101 Referring to Figure 4 2 2 7 Is it similar Start Replace DP 101 Duplexer is OK YES NO Z 3 X B O X C O M ...

Page 88: ...nt Port PCS Port Circuit Diagram Circuit Diagram Checking Flow Checking Flow Waveform Waveform PCS Port ANT Port Figure 4 2 2 8 PCS Tx DCN Tx PCS Rx DCN Rx TP1 TP2 Check pin2 6 at F105 Referring to Figure 4 2 1 8 Is it similar Start Replace F 105 Diplexer is OK YES NO Z 3 X B O X C O M ...

Page 89: ...oint Test Point Circuit Diagram Circuit Diagram Checking Flow Checking Flow Waveform Waveform RF OUT RF IN Figure 4 2 2 9 RF IN RF OUT TP1 TP2 Check pin1 2 at U101 Referring to Figure 4 2 1 9 Is it similar Start Replace F 105 Mobile S W is OK YES NO Z 3 X B O X C O M ...

Page 90: ... 3 1 Power 4 3 1 1 Power On Trouble U303 1 8V_MSMP1 2 9V_RX 2 6V_MSMP2 2 6V_MSMA 2 8V_TCXO Circuit Diagram Circuit Diagram Test point Test point 1 4V_MSMC 1 4_MSMC 1 8_MSMP1 2 6V_MSMP2 2 9V_RX 2 6V_MSMA 2 8V_TCXO R328 R330 R331 R332 L301 L302 Z 3 X B O X C O M ...

Page 91: ...4V_MSMC 1 8V_MSMP 1 2 6V_MSMP 2 2 6V_MSMA 2 8V_TCXO Logic level at PS _HOLD R306 of U303 High Does it work properly Charge of Change Battery and try again Check the contact of power key Replace U 303 Re download software andtry again The Phone will power on Does it work properly Re download software andtry again Re download software and try again YES NO NO NO NO NO NO YES YES YES YES YES Z 3 X B O...

Page 92: ...lectronics Inc MX8550 4 3 1 1 Charging Trouble Circuit Diagram Circuit Diagram Test point Test point 5V_CHAR of D301 pin1 Pin1 CON 701 U306 U702 5V_USB of D301 pin2 Battery Vcc VPWR 5V_CHAR 5V_USB Z 3 X B O X C O M ...

Page 93: ...V Voltage of pin 1 CON701 VBATT VPWR Is the battery charged Re soldering CON400 The charging adaptor TA or USB cable USB port of computer is out of order Replace U306 Charging will operate properly Check the soldering Replace U702 Re solder U702 The battery may have the problem Change the battery and try again YES NO YES NO NO NO NO NO YES YES YES YES Z 3 X B O X C O M ...

Page 94: ... 93 148 LG Electronics Inc MX8550 4 3 2 DSP 4 3 2 1 DSP Trouble Circuit Diagram Circuit Diagram TP700 TP701 TP702 TP704 TP703 TP705 R700 Clock out 28MHz C702 DSP_RESET Z 3 X B O X C O M ...

Page 95: ... 94 148 LG Electronics Inc MX8550 Test point Test point TP700 TP701 TP704 TP702 TP705 TP703 R700 C702 R324 2 6V_DSP_IO2 R325 1 8V_DSP_IO1 R326 1 2V_DSP_CORE1 R321 1 2V_DSP_IO2 Z 3 X B O X C O M ...

Page 96: ...the voltage of the following LDOs 1 2V_DSP_CORE 1 1 2V_DSP_CORE 2 1 8V_DSP_IO1 2 6V_DSP_IO2 Check DSP Clock at R700 Check the control signal TP700 TP705 C702 Replace U307 U308 U309 U310 Replace X700 Replace U701 DSP will operate properly YES NO YES NO NO YES Z 3 X B O X C O M ...

Page 97: ...atus of the LCD Module The assembly status of the main connector The Soldering of connector Circuit Diagram Circuit Diagram LCD Control signals From DSP LCD_D 0 15 LCD_CS LCD_WE LCD_ID From MSM LCD_RESET Test point Test point F205 F206 F209 F208 F207 F205 F206 F207 F208 F209 Z 3 X B O X C O M ...

Page 98: ...ble 4 3 2 Check theV oltageof R329 2 8V Check the Con trol signal Data 0 15 LCD_RESET LCD_CS WE Check CON 202soldering Change the LCDModule Replace U 701 Replace U 303 LCDdisplay will work properly Re solderCON202 YES NO YES NO NO NO NO YES YES YES Check F205 F206 F207 F208 F209 Signal line Z 3 X B O X C O M ...

Page 99: ...Camera Trouble Circuit Diagram Circuit Diagram Test point Test point U105 U106 U104 F100 F101 C107 C110 C109 C113 C108 C108 CAM_PCLK C107 CAM_RESET R106 CAM_SCL R107 CAM_SDA C113 CAM_MCLK C100 1 8V_C AM_D C101 2 6V_C AM_IO C102 2 8V_CA M_A Z 3 X B O X C O M ...

Page 100: ... following LDOs 1 8V_CAM_D 2 6V_CAM_IO 2 8V_CAM_A Check the Control signal CAM_DATA 0 7 CAM_RESET CAM_SDA CAM_SCL Check CON100 Soldering Replace U701 or Main board Replace the Camera module Replace U104 U105 U106 Camera will work properly Re solder CON100 YES NO YES NO NO NO NO YES YES YES Check F100 F101 C107 C108 C109 C110 C113 Signal line Z 3 X B O X C O M ...

Page 101: ...3 5 Audio 4 3 5 1 Speaker Trouble Circuit Diagram Circuit Diagram CODEC part MIC Analog S W part Headset Amp part R533 2 8V_TCXO R525 Level translated clock R532 1 8V_MSMP1 R530 3 0V_DSP_SD R532 VPWR C519 HPH_L C520 HPH_R Z 3 X B O X C O M ...

Page 102: ...2 Check the audio signal at CON 501 Check the state of speaker contact Replace U303 Speakerwill work properly YES YES NO NO NO YES YES Replace MSM or Main B D Check the soldering at C519 C520 Resolder C519 C520 Replace U516 Check the soldering at U516 Resolder U516 with heat gun Check the clock signal at R 525 NO YES YES Replace U303 Check the voltage at R533 Resolder U517 with heat gun NO NO NO Y...

Page 103: ... 102 148 LG Electronics Inc MX8550 4 3 5 2 Receiver Trouble Circuit Diagram Circuit Diagram Test point Test point R602 R601 R601 RCV R602 RCV Z 3 X B O X C O M ...

Page 104: ...pen or not between the pin 44 45 of 80pin connector and the receiver pad RCV RCV Replace FPCB Receiver will work properly YES YES NO NO Replace MSM or Main B D Check the soldering at R601 R602 Resolder R601 R602 Check the signal at RCV RCV NO YES YES Replace Receiver Check the soldering of receiver Resolder receiver NO NO YES YES Z 3 X B O X C O M ...

Page 105: ...it Diagram Circuit Diagram Circuit Diagram CODEC part MIC Analog S W part Headset Amp part R533 2 8V_TCXO R525 Level translated clock R532 1 8V_MSMP1 R530 3 0V_DSP_SD R532 VPWR C519 HPH_L C520 HPH_R C537 EAR_L C538 EAR_R U518 CODEC U516 Headset amp R526 2 6V_MSMA Z 3 X B O X C O M ...

Page 106: ... 105 148 LG Electronics Inc MX8550 EAR_MIC_KEY part Receptacle part 4pole Earjack part C428 LHP_EJ C427 RHP_EJ 18PIN_DETECT pull up U303 PMIC Z 3 X B O X C O M ...

Page 107: ... 106 148 LG Electronics Inc MX8550 Test point Test point CON400 C519 C520 C537 C538 U516 U518 CON401 C427 C428 R526 U303 R422 Z 3 X B O X C O M ...

Page 108: ...eceptacle or 4pole headset to 4pole earjack Does the audio profile of the phone change to the headset Mode 1 Headset detect problem Change headset and try again Can you hear the Sound from headset Set the audio part of the test equipment to continuous wave mode Can you hear your voice from headset Headset will work properly 4 3 2 Headset receiving path problem Headset sending path problem YES YES ...

Page 109: ...he soldering at C519 C520 Resolder C 519 C520 YES NO YES 2 Check the soldering at C537 C538 NO YES Resolder U 516 with heat gun Resolder C 537 C538 ReplaceU516 Check the audio signal at C 427 C428 NO YES Check the voltage at R526whether it is 2 6V NO YES Resolder U 518 with heat gun Resolder R 526 ReplaceU518 NO NO Check the soldering of CON 401or Pin4 5 of CON 400 Resolder CON 401or CON 400 NO Re...

Page 110: ...ng Flow Headset detect problem Check the voltage at pin 2 of CON403Whether its range is 1 65 2 1V YES NO YES 1 Check the soldering of U 303 NO YES ReplaceU303 Check the voltage at R 425 Whether its state is low NO YES Redownload S W Resolder U 303with heat gun 4 Z 3 X B O X C O M ...

Page 111: ... Flow Headset sending path problem Check the voltage at pin 2 of CON403Whether its range is 1 65 2 1V YES NO YES 3 Check the soldering of U 303 NO YES ReplaceU303 Does it work NO YES Redownload S W Resolder U 303with heat gun 4 Does it work well NO YES Replace Main B D Z 3 X B O X C O M ...

Page 112: ... 111 148 LG Electronics Inc MX8550 Circuit Diagram Circuit Diagram 4 3 5 4 MIC Trouble MIC Network MIC Bias MIC MIC MIC PAD MIC PAD Z 3 X B O X C O M ...

Page 113: ... 112 148 LG Electronics Inc MX8550 Test point Test point R538 U501 R210 C207 C208 MIC network Z 3 X B O X C O M ...

Page 114: ...1 2 1 5V Check the signal level at Each side of MIC Check the soldering at C207 C208 Check the soldering of MIC network Resolder U501 MIC will work properly YES YES NO NO NO YES YES Replace MSM or Main B D Check the soldering at R538 Resolder R538 Check the signal level at R210 NO YES YES NO YES Resolder MIC Resolder C207 C208 NO Resolder MIC network Z 3 X B O X C O M ...

Page 115: ...ectronics Inc MX8550 Circuit Diagram Circuit Diagram 4 3 6 Backlight 4 3 6 1 Numeric key backlight Test point Test point Q600 LED LED Q600 LED Switching Tr LED600 side lighting LED601 side lighting Z 3 X B O X C O M ...

Page 116: ...Flow START Is the voltage level of VPWR 3 3 4 2V Is Q600 working Charge battery Main key backlight will work properly YES NO NO YES Are all LEDs working NO YES YES Check the soldering of each R andLEDS or replace if not wor king Replace Q 600 Z 3 X B O X C O M ...

Page 117: ...550 4 3 6 2 Touch key backlight Circuit Diagram Circuit Diagram Test point Test point LED R118 R120 R122 R115 Q102 Q102 LED Switching Tr LED108 Soft key Right LED109 Soft key Left LED110 Speaker key LED111 Clear key Z 3 X B O X C O M ...

Page 118: ...king Flow START Is Q102 working Touch key backlight will work properly YES NO YES Are all LEDs working R115 R118 R120 R122 LED108 LED109 LED110 LED111 NO YES Check the soldering of each R andLEDS or replace if not wor king Replace Q 102 Z 3 X B O X C O M ...

Page 119: ...uit Diagram R134 a resistor for adjusting light difference C148 Charge pump output4 C147 Charge pump output3 C145 Charge pump output1 C146 Charge pump output2 C134 Charge pump Input U102 Expander1 U105 Expander2 U103 Expander3 U104 Expander4 U101 Charge Pump Z 3 X B O X C O M ...

Page 120: ... 119 148 LG Electronics Inc MX8550 Test point Test point R134 C134 C148 C145 C147 C146 R128 U105 U103 U104 U102 U101 Z 3 X B O X C O M ...

Page 121: ...eel light will work properly YES NO Check the R134 whether it is 56ohm NO YES YES Check the anodes of dual LEDs are short circuited Are there short circuited Resolder Dual LEDs Replace the expanders U102 103 104 105 in key PCB which are related with miss lighted LEDS 2 1 All LEDS do not turns on Z 3 X B O X C O M ...

Page 122: ...el light will work properly Check the voltage level at pin50 51 of CON102 of FPCB Is It VPWR level Check the voltage level at pin 54 55 56 of CON101 of FPCB Is It VPWR level Check the voltage level at pin 54 55 56 of CON600 of Main B D Is It VPWR level Replace FPCB Replace Main B D Resolder CON101 of FPCB Resolder CON201 of key PCB YES YES YES YES NO NO NO NO YES NO 3 Check the signal at C145 146 ...

Page 123: ... pin 6 of CON102 of FPCB Is there any pulse or something Check the voltage at pin 28 of CON101 of FPCB Is there any pulse or something Check the voltage at pin 28 of CON600 of Main B D Is there any pulse or something Replace FPCB Replace Main B D Resolder CON101 of FPCB Resolder CON201 of key PCB YES YES YES NO NO NO NO 3 Replace U101 of key PCB YES Z 3 X B O X C O M ...

Page 124: ...n 7 8 9 10 of CON102 of FPCB Is there any pulse or something Check the voltage at pin 24 27 of CON101 of FPCB Is there any pulse or something Check the voltage at pin 24 27 of CON600 of Main B D Is there any pulse or something Replace FPCB Replace Main B D Resolder CON101 of FPCB Resolder CON201 of key PCB YES YES YES NO NO NO NO 4 Replace U101 of key PCB YES Z 3 X B O X C O M ...

Page 125: ... 124 148 LG Electronics Inc MX8550 4 3 7 The Wheel operation Circuit Diagram Circuit Diagram Test point Test point Q101 C143 C143 2 6V_WHEEL Q101 wheel supply switching Tr Z 3 X B O X C O M ...

Page 126: ...3of Q101of key PCB Is it2 6V when you keep moving the wheel Check the control signal at pin 2 of Q101of key PCB Is it High level when you keep moving the wheel YES Replace Q 101 1 2 YES NO NO Is the wheel moving well mechanically Check the light diffusing sheet like white ring in the upper case whether it is well positioned Replace the light diffusing sheet Replace the wheel NO YES YES Z 3 X B O X...

Page 127: ... Replace FPCB Replace Main B D Resolder CON 101 of FPCB Resolder CON 201 of key PCB YES YES YES NO NO NO NO 2 Replace the wheel YES Check the voltage at pin 20 of CON 201 of key PCB Is there any pulse when you keep moving the wheel Check the voltage at pin 20 of CON 102 of FPCB Is there any pulse when you keep moving the wheel Check the voltage at pin 35 of CON 101 of FPCB Is there any pulse when ...

Page 128: ... 127 148 LG Electronics Inc MX8550 4 3 8 Vibrator Circuit Diagram Circuit Diagram Test point Test point R610 Q602 Q601 R611 R612 Motor driving Tr Motor Bias input Tr Z 3 X B O X C O M ...

Page 129: ...voltage of MOTOR_EN about 2 6V Check soldering of R610 R611 R612 Is Q602 Q603 Working Check the state at contact of vibrator Replace Q102 Q103 Replace Vibrator Re contact vibrator Re solder R125 R126 R129 YES YES YES NO NO NO NO Change the main board YES Start The vibrator will Work properly NO Z 3 X B O X C O M ...

Page 130: ...ositioned Conductive gasket which gives connection between upper window and sensing patterns of key PCB Sensing pattern of key PCB Upper window case Mechanical Figure for Touch function Mechanical Figure for Touch function R131 U106 R129 R130 C138 R131 TOUCH DATA R129 TOUCH CLOCK R130 TOUCH ACK C138 2 6V_TOUCH Z 3 X B O X C O M ...

Page 131: ...lace U106 NO YES YES NO Start Touch key will work properly NO 2 3 Check the conductive gasket whether it is well positioned Check the double adhesive tape on the gasket whether it is well positioned Are there any wrinkles on double adhesive tape Replace double adhesive tape YES YES YES Replace conductive gasket NO Make sure that the trouble is about mechanical thing at first Z 3 X B O X C O M ...

Page 132: ... pin 11 of CON102 of FPCB Is it 2 6V when you press touch key Check the voltage at pin 29 of CON101 of FPCB Is it 2 6V when you press touch key Check the voltage at pin 29 of CON600 of Main B D Is it 2 6V when you press touch key Replace FPCB Replace Main B D Resolder CON101 of FPCB Resolder CON201 of key PCB YES YES YES NO NO NO NO 2 Replace key PCB YES Z 3 X B O X C O M ...

Page 133: ...of CON102 of FPCB Is there any pulse when you press touch key Check the signal at pin 32 33 34 of CON101 of FPCB Is there any pulse when you press touch key Check the signal at pin 32 33 34 of CON600 of Main B D Is there any pulse when you press touch key Replace FPCB Replace Main B D Resolder CON101 of FPCB Resolder CON201 of key PCB YES YES YES NO NO NO NO 3 Replace key PCB YES Z 3 X B O X C O M...

Page 134: ...ion FCC proposed the adoption of this updated Standard The design of your phone complies with this updated Standard Of course if you want to limit RF exposure even further than the updated ANSI Standard you may choose to control the duration of your calls and operation your phone in the most power efficient manner Efficient Phone Operation For your phone to operate at the lowest power level consis...

Page 135: ...fore boarding any aircraft Use it on the ground only with crew permission Do not use it in the air To prevent possible interference with aircraft systems US Federal Aviation Administration FAA regulations require you to have permission from a crew member to use your phone while the plane is on the ground Using your phone while the plane is in the air Children Do not allow children to play with you...

Page 136: ...ane must compl7y with the National Fire Protection Standard NFPA 58 For a copy of this standard contact the National Fire Protection Association One Battery march Park Quincy MA 02269 Attn Publication Sales Division Rule of Thumb Using common sense at all times when handling installing or using the phone Any questions should be directed to you nearest Service Center or authorized service technicia...

Page 137: ...received from the base station Access Channel Slot The assigned time interval for an access probe An Access Channel slot consists of an integer number of frames The transmission of an access probe is performed within the boundaries of an Access Channel slot Access Probe One Access Channel transmission consisting of a preamble and a message The transmission is an integer number of frames in length ...

Page 138: ...omestic Public Cellular Radio Telecommunications Service other than a mobile station used for communicating with mobile stations Depending upon the context the term base station may refer to a cell a sector within a cell an MSC or other part of the Cellular system See also MSC Base Station Authentication Response AUTHBS An 18 bit pattern generated by the authentication algorithm AUTHBS is used to ...

Page 139: ...tecting codes which generate parity check bits by finding the remainder of a polynomial division Data Burst Randomizer The function that determines which power control groups within a frame are transmitted on the Reverse Traffic Channel when the data rate is lower than 9600 bps The data burst randomizer determines for each mobile station the pseudo random position of the transmitted power control ...

Page 140: ...nal expansion of the signaling message between the base station and mobile station to allow for the addition of new system features and operational capabilities Fade Timer A timer kept by the mobile station as a measure of Forward Traffic Channel continuity If the Fade timer expires the mobile station drops the call Flash An indication sent on an analog voice channel or CDMA Traffic Channel indica...

Page 141: ...the Traffic Channel Hard handoffs Occur when the mobile station is transferred between disjoint Active Sets the CDMA frequency assignment changes the frame offset changes or the mobile station is directed from a CDMA Traffic Channel to an analog voice channel See also Soft Handoff Hash Function A function used by the mobile station to select one out of N available resource The hash function distri...

Page 142: ...H a message body the part conveying the information and a CRC Message Body The part of the message contained between the length field MSG_LENGTH and the CRC field Message Capsule A sequence of bits comprising a single message and padding The padding always follows the message and may be of zero length Message CRC The CRC associated with a message See also Cyclic Redundancy Check Message Field A ba...

Page 143: ...to handle a special requirement A network can be as small or as large as needed as long as it is fully contained within a system See also System Network Identification NID A number that uniquely identifies a network within a Cellular system See also System Identification NID See Network Identification Non Autonomous Registration A registration method in which the base station initiates registratio...

Page 144: ...Channel Slot An 80ms interval on the Paging Channel Mobile station operating in the slotted mode are assigned specific slots in which day monitor messages from the base station Parameter Change Registration A registration method in which the mobile station registers when certain of its stored parameters change Parity Check Bits Bits added to a sequence of information bits to provide error detectio...

Page 145: ...ode Mask The long code mask used to form the private long code The mask contains the ESN of the mobile station See also Private Long Code Mask and Long Code Punctured Code An error correcting code generated from another error correcting code by deleting i e puncturing code symbols from the code output Quick Repeats Additional transmissions of identical copies of a message within a short interval t...

Page 146: ...ffic An additional traffic stream that can be carried between the mobile station and the base station on the Traffic Channel See also Primary Traffic and Signaling Traffic Seizure Precursor The initial digital sequence transmitted by a mobile station to a base station on a reverse analog control channel Seizure Option A service capability of the system Service options may be applications such as v...

Page 147: ...us Indicates whether a mobile station is in its home system Termination Status Indicates whether a mobile station must terminate the call when it is on an analog voice channel Supervisory Audio Tone SAT One of three tones in the 6 kHz region that is transmitted on the forward analog voice channel by a base station and transponder on the reverse analog voice channel by as mobile station Supplementa...

Page 148: ...y RAND Unique Random Variable RANDU A 24 bit random number generated by the base station in support of the Unique Challenge Response procedure Universal Coordinated Time UTC An internationally agreed upon time scale maintained by the Bureau International de l Heure BIH used as the time reference by nearly all commonly available time and frequency distribution systems i e WWW WWVH LORAN C Transit O...

Page 149: ...ix Appendix 1 Assembly and Disassembly diagram 2 Block and Circuit diagram 3 Part List 4 Component Layout 5 Accessories AC adaptor Handsfree kit Cigar Light Charger Data kit 6 WLPST LGE Product Support Tool for WIN98 2000 XP Z 3 X B O X C O M ...

Page 150: ...1 Assembly and Disassembly Diagram Z 3 X B O X C O M ...

Page 151: ...Z 3 X B O X C O M ...

Page 152: ...2 Block and Circuit Diagram Z 3 X B O X C O M ...

Page 153: ...PS VCO Digital I Os Controls Diversity Rx VCO Dual BPF GPS BPF Primary Path Secondary Path HDET RFT6150 RFR6500 Tx Rx Tx Rx Diplexer B7839 PCS Duplexer DCN Duplexer CDMA Antenna GPS Antenna CDMA RF connector GPS RF connector DCN BPF PCS BPF DCN PCS DCN Coupler Fref Loop Filter for CDMA Tx Buffer TCXO Loop Filter for CDMA Rx Loop Filter for GPS Ref SBI Control SBI Control Tx_I Tx_Q Rx0_I Rx0_Q Rx1_...

Page 154: ...d Expander Compressor Karaoke Voice Pitch Change Audio Engine DSP Dynamic Range Control DRC 8 48kHz rate 16bit Stereo 192kHz sampling frequency DAC Stereo HP amp Mono Digital Speaker amp Class D Non clip by S W 700mW 16bit 8bit Wheel Light I2C B Register MAX 9722B CODEC YMU800 To MSM Voice Call To CODEC Recording flix MIC MIC IN Mono A IN Stereo Charge Pump AAT3123 4 GPIO Expander 4 AAT4290 I2S D ...

Page 155: ...MX8550 MX8550 SCHEMATIC LAUOUT 1 Main PCB Revision 1 0 2 Slide Key PCB Revision 1 0 3 FPCB Revision 1 0 4 Side Key Revision 1 0 Z 3 X B O X C O M ...

Page 156: ...Z 3 X B O X C O M ...

Page 157: ...Z 3 X B O X C O M ...

Page 158: ...Z 3 X B O X C O M ...

Page 159: ...Z 3 X B O X C O M ...

Page 160: ...Z 3 X B O X C O M ...

Page 161: ...Z 3 X B O X C O M ...

Page 162: ...Z 3 X B O X C O M ...

Page 163: ...Z 3 X B O X C O M ...

Page 164: ...Z 3 X B O X C O M ...

Page 165: ...Z 3 X B O X C O M ...

Page 166: ...Z 3 X B O X C O M ...

Page 167: ...3 Part List Z 3 X B O X C O M ...

Page 168: ...NP0 TC 1005 R TP MCH155A060DK C128 CAP CHIP MAKER ECZH0000826 27 pF 50V J NP0 TC 1005 R TP C1005C0G1H270JT C129 CAP CHIP MAKER ECZH0000826 27 pF 50V J NP0 TC 1005 R TP C1005C0G1H270JT C130 CAP CERAMIC CHIP ECCH0000107 6 pF 50V D NP0 TC 1005 R TP MCH155A060DK C131 CAP CERAMIC CHIP ECCH0000107 6 pF 50V D NP0 TC 1005 R TP MCH155A060DK C132 CAP CERAMIC CHIP ECCH0000105 4 pF 50V C NP0 TC 1005 R TP MCH1...

Page 169: ... C191 CAP CHIP MAKER ECZH0001122 680 pF 50V K X7R HD 1005 R TP C1005X7R1H681KT C193 CAP CHIP MAKER ECZH0000801 220 pF 16V J NP0 TC 1005 R TP C1005C0G1C221JT C194 CAP CHIP MAKER ECZH0000801 220 pF 16V J NP0 TC 1005 R TP C1005C0G1C221JT C195 CAP CHIP MAKER ECZH0001106 4700 pF 25V K X7R HD 1005 R TP C1005X7R1E472KT C197 CAP CERAMIC CHIP ECCH0000143 1 nF 50V K X7R HD 1005 R TP MCH155CN102KK C198 CAP C...

Page 170: ...pF 50V K X7R HD 1005 R TP C1005X7R1H471KT C440 CAP CHIP MAKER ECZH0000813 100 pF 50V J NP0 TC 1005 R TP C1005C0G1H101JT C441 CAP CHIP MAKER ECZH0000813 100 pF 50V J NP0 TC 1005 R TP C1005C0G1H101JT C502 CAP CERAMIC CHIP ECCH0000155 10 nF 16V K X7R HD 1005 R TP MCH153CN103KK C503 CAP CERAMIC CHIP ECCH0002001 100000 pF 6 3V K B HD 1005 R TP C1005JB0J104KT C521 CAP CERAMIC CHIP ECCH0000155 10 nF 16V ...

Page 171: ...x0 6x0 5t empty empty empty empty Rclamp0521P TCT D404 DIODE TVS EDTY0009601 SLP1006P2 5 V 100 W R TP 1 0x0 6x0 5t empty empty empty empty Rclamp0521P TCT D700 DIODE TVS EDTY0007401 SMD 12 V 350 W R TP SD12T1G DP100 DUPLEXER DCN SDDY0004101 836 5 MHz 881 5 MHz 2 0 dB 2 7 dB 49 dB 61 dB 3 0 2 5 1 25 SMD B7637 DP101 DUPLEXER PCS SDPY0002902 1880 MHz 1960 MHz 3 8 dB 3 5 dB 43 dB 52 dB 3 8 3 8 1 4 SMD...

Page 172: ...SJ101 R107 RES CHIP MAKER ERHZ0000490 51 ohm 1 16W J 1005 R TP MCR01MZSJ510 R108 RES CHIP MAKER ERHZ0003203 11 3 Kohm 1 16W F 1005 R TP MCR01MZSF1132 R109 RES CHIP MAKER ERHZ0000406 100 Kohm 1 16W J 1005 R TP MCR01MZSJ104 R110 RES CHIP MAKER ERHZ0000490 51 ohm 1 16W J 1005 R TP MCR01MZSJ510 R111 RES CHIP MAKER ERHZ0000299 5600 ohm 1 16W F 1005 R TP MCR01MZSF5601 R112 RES CHIP MAKER ERHZ0000401 0 o...

Page 173: ...1V150FR R435 RES CHIP MAKER ERHZ0000401 0 ohm 1 16W J 1005 R TP MCR01MZSJ000 R437 RES CHIP MAKER ERHZ0000404 1 Kohm 1 16W J 1005 R TP MCR01MZSJ102 R438 RES CHIP MAKER ERHZ0000404 1 Kohm 1 16W J 1005 R TP MCR01MZSJ102 R439 RES CHIP MAKER ERHZ0000401 0 ohm 1 16W J 1005 R TP MCR01MZSJ000 R440 RES CHIP MAKER ERHZ0000401 0 ohm 1 16W J 1005 R TP MCR01MZSJ000 R441 RES CHIP MAKER ERHZ0000401 0 ohm 1 16W J...

Page 174: ...SOP5 P 0 65A 5 PIN R TP INVERTER Pb Free TC7SH04FU U110 IC EUSY0257701 QFN 56 PIN R TP No lead Dual RF Receiver IC RFR6500 U111 IC EUSY0257801 QFN 32 PIN R TP No lead RF transmitter IC RFT6150 U112 IC EUSY0186502 Micropak 6 PIN R TP Single SPDT Analog Switch Pb Free FSA4157L6X U113 CONN RF SWITCH ENWY0000107 RF CONN ETC 0 15 dB HIROSE MS 156NB U201 RESONATOR EXRY0002401 48 MHz 5 14 pF SMD 2 0 1 2 ...

Page 175: ... J X7R TC 0603 R TP C0603C0G1H101JT C403 CAP CERAMIC CHIP ECCH0009103 100 pF 50V J X7R TC 0603 R TP C0603C0G1H101JT C404 CAP CERAMIC CHIP ECCH0009103 100 pF 50V J X7R TC 0603 R TP C0603C0G1H101JT C405 CAP CERAMIC CHIP ECCH0009103 100 pF 50V J X7R TC 0603 R TP C0603C0G1H101JT C406 CAP CERAMIC CHIP ECCH0009103 100 pF 50V J X7R TC 0603 R TP C0603C0G1H101JT C407 CAP CERAMIC CHIP ECCH0009103 100 pF 50V...

Page 176: ...5C1E330J C631 CAP CHIP MAKER ECZH0025908 8 pF 25V D NP0 TC 0603 R TP GRM0335C1E080D C632 CAP CHIP MAKER ECZH0025916 33 pF 25V J NP0 TC 0603 R TP GRM0335C1E330J C633 CAP CHIP MAKER ECZH0025916 33 pF 25V J NP0 TC 0603 R TP GRM0335C1E330J C635 CAP CHIP MAKER ECZH0025916 33 pF 25V J NP0 TC 0603 R TP GRM0335C1E330J C636 CAP CHIP MAKER ECZH0025916 33 pF 25V J NP0 TC 0603 R TP GRM0335C1E330J C637 CAP CHI...

Page 177: ...6W J 1005 R TP MCR01MZSJ100 R312 RES CHIP MAKER ERHZ0000402 10 ohm 1 16W J 1005 R TP MCR01MZSJ100 R313 RES CHIP MAKER ERHZ0000444 22 Kohm 1 16W J 1005 R TP MCR01MZSJ223 R314 RES CHIP MAKER ERHZ0000444 22 Kohm 1 16W J 1005 R TP MCR01MZSJ223 R328 RES CHIP MAKER ERHZ0000401 0 ohm 1 16W J 1005 R TP MCR01MZSJ000 R329 RES CHIP MAKER ERHZ0000401 0 ohm 1 16W J 1005 R TP MCR01MZSJ000 R330 RES CHIP MAKER ER...

Page 178: ...06 100 Kohm 1 20W 0 05W J 0603 R TP MCR006MZPJ104 R615 RES CHIP ERHY0009506 100 Kohm 1 20W 0 05W J 0603 R TP MCR006MZPJ104 R616 RES CHIP ERHY0009506 100 Kohm 1 20W 0 05W J 0603 R TP MCR006MZPJ104 R617 RES CHIP ERHY0009506 100 Kohm 1 20W 0 05W J 0603 R TP MCR006MZPJ104 R618 RES CHIP ERHY0009506 100 Kohm 1 20W 0 05W J 0603 R TP MCR006MZPJ104 R619 RES CHIP ERHY0009506 100 Kohm 1 20W 0 05W J 0603 R TP...

Page 179: ...FC FPC ENQY0010901 35 PIN 0 3 mm ETC H 1 2 XF2B 3545 31A P F205 FILTER EMI POWER SFEY0010501 SMD SMD 18 V 4ch EMI_ESD Filter 100Ohm 15pF Pb free ICVE10184E150R101FR F206 FILTER EMI POWER SFEY0010501 SMD SMD 18 V 4ch EMI_ESD Filter 100Ohm 15pF Pb free ICVE10184E150R101FR F207 FILTER EMI POWER SFEY0010501 SMD SMD 18 V 4ch EMI_ESD Filter 100Ohm 15pF Pb free ICVE10184E150R101FR F208 FILTER EMI POWER S...

Page 180: ...pty empty empty QSMF C16C D103 DIODE LED 7 SEG EDLS0001301 RED BLUE 2 DIGIT R TP DUAL INDICATOR empty 2 empty empty empty QSMF C16C D104 DIODE LED 7 SEG EDLS0001301 RED BLUE 2 DIGIT R TP DUAL INDICATOR empty 2 empty empty empty QSMF C16C D105 DIODE LED 7 SEG EDLS0001301 RED BLUE 2 DIGIT R TP DUAL INDICATOR empty 2 empty empty empty QSMF C16C D106 DIODE LED 7 SEG EDLS0001301 RED BLUE 2 DIGIT R TP D...

Page 181: ...T C113 CAP CHIP MAKER ECZH0000830 33 pF 50V J NP0 TC 1005 R TP C1005C0G1H330JT CON100 CONNECTOR BOARD T ENBY0020401 24 PIN 0 4 mm ETC H 0 9 Socket AXK7L24227G CON102 CONNECTOR BOARD T ENBY0023601 54 PIN 0 4 mm ETC H 0 9 Header AXK8L54125BG F100 FILTER EMI POWER SFEY0013501 SMD 18V 4ch EMI_ESD Filter 10 Ohm 7 5pF EVRC18S03Q015010R F101 FILTER EMI POWER SFEY0013501 SMD 18V 4ch EMI_ESD Filter 10 Ohm ...

Page 182: ...4 Components Layout Z 3 X B O X C O M ...

Page 183: ...Z 3 X B O X C O M ...

Page 184: ...Z 3 X B O X C O M ...

Page 185: ...Z 3 X B O X C O M ...

Page 186: ...Z 3 X B O X C O M ...

Page 187: ...Z 3 X B O X C O M ...

Page 188: ...Z 3 X B O X C O M ...

Page 189: ...Z 3 X B O X C O M ...

Page 190: ...Z 3 X B O X C O M ...

Search results

Summary of Contents for MX8550

Reviews:

Related manuals for MX8550

Brands by name

Popular brands

LG MX8550, Service Manual

Search results

Summary of Contents for MX8550

Reviews:

Related manuals for MX8550

Brands by name

Popular brands