LG LG- PX240 Service Manual Download Page 38

Page: 38 / 96

4.2.2 Checking VCTCXO Circuit

Circuit Diagram

Test Point

Checking Flow

Check F1301 Pin 3

Check F1301 Pin 4

19.2MHz OK?

+2.85V OK?

Yes

VCTCXO Circuit is Ok
See next Page to check
Quintplexer

Check U4101

Yes

Changing F1301

Figure 4.2-8 TCXO OUT WAVEFORM

Figure 4.2-9 +2.85V_TCXO WAVEFORM

Waveform

Figure 4.2-6 VCTCXO

Figure 4.2-7 VCTCXO CIRCUIT

F1301 Pin4

+2.85V_TCXO

F1301 Pin3
TCXO OUT

Z3X-BOX.COM

Summary of Contents for LG- PX240

Page 1: ...CDMA PORTABLE CELLULAR PHONE LG PX240 SERVICE MANUAL Dual band CDMA GPS PCS Cellular CDMA GPS CDMA Mobile Phone Z 3 X B O X C O M ...

Page 2: ...TENTS General Introduction CHAPTER 1 System Introduction CHAPTER 2 NAM Input Method CHAPTER 3 Circuit Description CHAPTER 4 Trouble Shooting CHAPTER 5 Safety CHAPTER 6 Glossary Appendix 2 Z 3 X B O X C O M ...

Page 3: ...tage DC 3 3 4 2V 1 1 4 Battery Power Consumption DC 3 7V SLEEP IDLE MAX POWER CELLULAR 1 5 mA 110 120mA 700 mA 24 dBm PCS 1 5 mA 120 130 mA 700 mA 24 dBm 1 1 5 Operating Temperature 30 C 60 C 1 1 6 Frequency Stability 1 CDMA 0 5PPM 2 PCS 0 1PPM 1 1 7 Antenna Internal Antenna 1 1 8 Size and Weight 1 Size 89 H 49 W 21 5 D mm 2 Weight 80 g Approximately with standard battery 1 1 9 Channel Spacing 1 C...

Page 4: ...4 MHz 2 PCS 1715 56 MHz 1768 89 MHz 3 GPS 3150 84 MHz 1 2 3 Sensitivity 1 CELLULAR 104 dBm C N 12dB or more 2 PCS 104 dBm C N 12dB or more 3 GPS 148 5 dBm w o SA 152 dBm w SA 1 2 4 Selectivity 1 CELLULAR 3dB C N Degration With Fch 1 25 KHz 30dBm 2 PCS 3dB C N Degration With Fch 1 25 KHz 30dBm 1 2 5 Interference Rejection 1 Single Tone 30dBm at 900 kHz CELLULAR 30dBm at 1 25MHz PCS 2 Two Tone 43dBm...

Page 5: ... below 1 98MHz 54 dBc 30kHz below 2 PCS 42 dBc 30KHz below 1 3 5 CDMA Minimum TX Power Control 1 CELLULAR 50dBm below 2 PCS 50dBm below 1 4 MS Mobile Station Transmitter Frequency 1 4 1 CELLULAR mode Ch Center Freq MHz Ch Center Freq MHz 1011 29 70 111 152 193 234 275 316 363 824 640 825 870 827 100 828 330 829 560 830 790 832 020 833 250 834 480 835 890 404 445 486 527 568 609 650 697 738 779 837...

Page 6: ... 1901 25 250 1862 50 650 1882 50 1050 1902 50 275 1863 75 675 1883 75 1075 1903 75 300 1865 00 700 1885 00 1100 1905 00 325 1866 25 725 1886 25 1125 1906 25 350 1867 50 750 1887 50 1150 1907 50 375 1868 75 775 1888 75 1175 1908 75 1 5 MS Mobile Station Receiver Frequency 1 5 1 CELLULAR mode Ch Center Freq MHz Ch Center Freq MHz 1011 29 70 111 152 193 234 275 316 363 869 640 870 870 872 100 873 330...

Page 7: ...8 75 575 1958 75 975 1978 75 200 1940 00 600 1960 00 1000 1980 00 225 1941 25 625 1961 25 1025 1981 25 250 1942 50 650 1962 50 1050 1982 50 275 1943 75 675 1963 75 1075 1983 75 300 1945 00 700 1965 00 1100 1985 00 325 1946 25 725 1966 25 1125 1986 25 350 1947 50 750 1967 50 1150 1987 50 375 1948 75 775 1968 75 1175 1988 75 1 5 3 GPS mode Center Freq 1575 42MHz 1 6 AC Adapter See Appendix 1 7 Cigar...

Page 8: ...ho sound when using the Hands Free Kit make sure that the speaker and microphone are not facing each other and keep microphone a generous distance from the speaker 2 3 2 Microphone Installation Install the microphone either by clipping I onto the sunvisor driver s side or by attaching it to door post driver s side using a velcno adhesive tape not included 2 3 3 Cable Connections 2 3 3 1 Power and ...

Page 9: ...AM Program Method and Telephone Number Inputting Method 1 NAM Programming Method Enter MENU Press Press 0 Press 000000 Î Î Î Press 2 Press 953047 Î Î Î 1 Check ESN and Press OK button Read only 2 Press 2 on keypad for entering PHONE NUMBER Edit OK Î Î 9 Z 3 X B O X C O M ...

Page 10: ...entering MDN Edit OK Î Î 4 Press 4 on keypad for entering Home SID Edit OK Î Î 5 Press 5 on keypad for entering NAM Name Edit OK Î 6 Press 6 on keypad for entering Service Program Code Edit OK Î Edit OK Î 10 Z 3 X B O X C O M ...

Page 11: ...eypad for entering MCC 8 Press 8 on keypad for entering NMSI 9 Press 9 on keypad for entering True MCC 10 Press 0 on keypad for entering True IMSI NMSI 11 Press on keypad for entering PRL Enabled 11 Z 3 X B O X C O M ...

Page 12: ...ton and Insert SID Number For NID Change do the same way as SID change 13 Choose Lockout SID NID for entering The action is same as Home SID NID 14 Choose CDMA Preferred CH for entering Insert the NAM 1 CDMA Primary CH B and press OK button 15 Choose Home Sys Reg for entering Use UP or DOWN key to select Yes or No and then press OK button 12 Z 3 X B O X C O M ...

Page 13: ...button 17 Choose Slot Cycle Idx for entering Insert Slot Cycle Index and Press OK button 18 Choose Acc Ovld Class for entering Insert the NAM Access Overload Class and Press OK button 19 Choose Phone Model for entering Check Phone Model and Press OK button 20 Choose Minlock for entering 13 Z 3 X B O X C O M ...

Page 14: ...o provide signal drive capability to the power amp After that the RF signal is amplified by the TX MCM in order to have enough power for radiation Finally the RF signal is sent out to the cell site via the antenna after going through the Quintplexer MX240 Block Diagram MX240 Block Diagram Rx VCO Frequency DCN 1738 08 1787 94 MHz PCS 1715 56 1768 89 MHz GPS 3150 84 MHz SBI 1 SKY74709 LO Distributio...

Page 15: ...ter into a single miniature package with a single antenna port The main function of Quintplexer ACFM 7101 is to prohibit the other band signals from flowing into the one band circuit and vice versa RF designer can use common tri band antenna regardless of frequency band 800 1575 and 1900 MHz The specification of MX240 Quintplexer is described below 15 Z 3 X B O X C O M ...

Page 16: ...16 Z 3 X B O X C O M ...

Page 17: ...ers with auto tuning loop UHF Voltage Controlled Oscillator VCO RF Phase Locked Loop PLL and DC Offset Compensation DCOC External components needed for operation include matching networks for differential mixer inputs and differential GPS Low Noise Amplifier LNA inputs CDMA PCS Surface Acoustic Wave SAW filters three bias resistors for accurate bias control over process variation and two high tole...

Page 18: ...18 Z 3 X B O X C O M ...

Page 19: ...ed to the desired RF frequency by the In Phase and Quadrature I Q modulator and amplified by the appropriate PA driver stage to provide variable output power The signal is filtered by an interstage transmit SAW filter and sent to the respective PA to obtain the final rated power The only external components needed to complete a CDMA radio subsystem are supply bypass capacitors and filtering capaci...

Page 20: ... of 3 2 V to 4 2 V Together with the SKY74609 receiver the SKY74709 transmitter forms Skyworks Tri Band Dual Mode CDMA RF Subsystem This subsystem is compliant with the IS 95 CDMA2000 and E 911standards 20 Z 3 X B O X C O M ...

Page 21: ...21 Z 3 X B O X C O M ...

Page 22: ...22 Z 3 X B O X C O M ...

Page 23: ...intercept point and high reverse isolation The frequency selectivity characteristic of mobile phone is mostly determined by LNA The specification of MX240 GPS LNA is described below Parameter GPS Band Units Gain 17 7 dB Noise Figure 0 6 dB 1dB compression point 14 4 dBm IIP3 6 5 dBm 23 Z 3 X B O X C O M ...

Page 24: ...Voltage Control Temperature Compensation Crystal Oscillator VCTCXO F1301 The temperature variation of mobile phone can be compensated by VCTCXO The reference frequency of a mobile phone is 19 2 MHz The receiver frequency tuning signals called TRK_LO_ADJ from MSM as 0 5 V 2 5 V DC via R and C filter in order to generate the reference frequency of 19 2 MHz and input it into the frequency synthesizer...

Page 25: ...rocessing 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 MSM6050 and amplifying part that amplifies signals coming out from MIC and transferring them to the audi...

Page 26: ... and Digital FM operating in both the cellular and PCS spectrums The subsystems within the MSM6050 include a CDMA processor a DFM processor a multi standard Vocoder an integrated wideband mono voice CODEC general purpose ADC for subsystem monitoring an ARM9TDMI microprocessor and both Universal Serial Bus USB and an RS 232 serial interfaces supporting forward and reverse link data communications o...

Page 27: ... assembling of terminals On the SRAM data generated during the terminal operation are stored temporarily 2 3 5 Power Supply Part When the battery voltage 3 7V is fed and the PWR key of keypad is pressed the power up circuitry in Power on off part is activated by the PWR_ON_SW signal and then the LDO regulators for MSM are operated and 1 86V_MSMC 2 85V_MSMP and 2 6V_MSMA are generated The Rx part r...

Page 28: ...m Using the down loading program the program can be changed even after the terminal is fully assembled SRAM is used to store the internal flag information call processing data and timer data z KEYPAD For key recognition key matrix is setup using KYPD 1 3 5 7 9 11 13 15 17 19 21 signal from MSM 17 LEDs and backlight circuitry are included in the keypad for easy operation in the dark z LCD MODULE LC...

Page 29: ...Channel DCN 610 or PCS 600 E5515C Setup CH DCN 610 or PCS 600 Sector Power 30 dBm Spectrum Analyzer Settiing Oscilloscope Setting 1 Check PMIC Circuit 2 Check VCTCXO Circuit 4 Check Duplexer Mobile SW 5 Check Rx I Q data Redownload SW CAL 3 Check Control Signal 1 2 3 5 4 CHAPTER 4 Trouble Shooting CHAPTER 4 Trouble Shooting 29 Z 3 X B O X C O M ...

Page 30: ...n 17 of U4101 2 85V_Rx OK No Pin 10 High No Changing Board PMIC Circuit is OK See next Page to check VCTCXO Replace U4101 Figure 4 1 2 MAX1827 PMIC U4101 Pin17 2 85V_RX Check Pin 10 of U4101 Yes Yes Figure 4 1 3 RX PART CIRCUIT OF MAX1827PMIC U4101 Pin10 PS_Hold 30 Z 3 X B O X C O M ...

Page 31: ...n 4 Refer to Figure 4 1 6 19 2MHz OK 2 85V OK No Yes VCTCXO Circuit is Ok See next Page to check Quintplexer Check U4101 No Yes Changing F1301 Figure 4 1 6 TCXO OUT WAVEFORM Figure 4 1 7 2 85V_TCXO WAVEFORM Waveform Figure 4 1 4 VCTCXO Figure 4 1 5 VCTCXO CIRCUIT F1301 Pin4 2 85V_TCXO F1301 Pin3 TCXO OUT 31 Z 3 X B O X C O M ...

Page 32: ...nce Refer to Figure 4 1 8 4 1 9 Level is High Similar to below Picture Yes No Yes No Download the SW Download the SW Control Signal is Ok See next Page to Check Quintplexer Mobile SW Figure 4 1 8 Rx MCM SKY74609 SBDT SBCK SBCK SBST Figure 4 1 9 SBDT SBCK WAVEFORM Figure 4 1 10 SBST SBCK WAVEFORM U1502 Pin20 SBST U1502 Pin18 SBCK U1502 Pin19 SBDT 32 Z 3 X B O X C O M ...

Page 33: ...t Circuit Diagram Figure 4 1 11 DUPLEXER SP3T SW MOBILE SW Figure 4 1 12 DUPLEXER SP3T SW MOBILE SW CIRCUIT U1003 Pin4 ANT U1004 Pin1 ANT U1004 Pin6 USPCS Tx U1004 Pin5 DCN Tx U1004 Pin4 GPS U1004 Pin3 USPCS Rx U1004 Pin2 DCN Rx 33 Z 3 X B O X C O M ...

Page 34: ...S Replace U1003 Check Quintplexer Check U1004 Pin2 Pin3 Level is Appear YES NO Check U1004 Pin1 Replace U1004 NO Level is Appear YES Replace Quintplexer Rx TEST SETUP HHP Test Channel DCN 610 or PCS 600 E5515C Setup CH DCN 610 or PCS 600 Sector Power 30 dBm Spectrum Analyzer Settiing Oscilloscope Setting Check U1004 Pin5 Pin6 34 Z 3 X B O X C O M ...

Page 35: ...re is Any Major Difference Refer to Figure 4 1 14 4 1 15 Similar to upper picture Yes No Replace U1502 Redownload the Software Calibrate Figure 4 1 13 SKY74609 Figure 4 1 15 RX_I_P RX_Q_P WAVEFORM Figure 4 1 16 RX_I_M RX_Q_M WAVEFORM U1502 Pin16 RX_IM U1502 Pin17 RX_IP U1502 Pin15 RX_QM U1502 Pin14 RX_QP Circuit Diagram Figure 4 1 14 RX I Q DATA CIRCUIT 35 Z 3 X B O X C O M ...

Page 36: ... DCN CH610 or PCS CH600 AGC 400 Spectrum analyzer setting Oscilloscope setting 1 Check PMIC Circuit 2 Check VCTCXO Circuit 3 Check SBI Control Signal 4 Check SKY74709 Circuit 5 Check Quintplexer Mobile SW Redownload SW CAL Figure 4 2 1 CHECK POINTS OF TX PART Mobile SW Quintplexer VCTCXO SKY74709 36 Z 3 X B O X C O M ...

Page 37: ...OK See Next Page to Check VCTCXO U1102 U4101 YES YES NO NO U2002 MSM TX ON Figure 4 2 2 MAX1827E PMIC Figure 4 2 3 SKY74709 Figure 4 2 4 TX PART CIRCUIT OF PMIC Figure 4 2 5 TX_ON CIRCUIT OF MSM SKY74709 U1102 Pin32 TX ON U4101 PMIC Pin 19 3 0V_TX U111 RFT6100 TX ON U4101 Pin19 3 0V_TX SKY74709 Pin 32 TX ON High 37 Z 3 X B O X C O M ...

Page 38: ...n 4 19 2MHz OK 2 85V OK No Yes VCTCXO Circuit is Ok See next Page to check Quintplexer Check U4101 No Yes Changing F1301 Figure 4 2 8 TCXO OUT WAVEFORM Figure 4 2 9 2 85V_TCXO WAVEFORM Waveform Figure 4 2 6 VCTCXO Figure 4 2 7 VCTCXO CIRCUIT F1301 Pin4 2 85V_TCXO F1301 Pin3 TCXO OUT 38 Z 3 X B O X C O M ...

Page 39: ...re NO Control Signal is OK See next page to check SKY74709 Circuit Check Pin29 YES Download the SW Download the SW Waveform SBDT SBCK SBCK SBST Figure 4 2 10 SKY74709 Figure 4 2 11 SBDT SBCK WAVEFORM Figure 4 2 12 SBST SBCK WAVEFORM U1102 SKY74709 Pin28 SBCK Pin29 SBST Pin30 SBDT 39 Z 3 X B O X C O M ...

Page 40: ... Figure 4 2 13 Skyworks TX MCM Load Switch Figure 4 2 14 Skyworks TX MCM Load Switch CIRCUIT U1102 Pin49 PCS RF_OUT U1102 Pin 9 Pin33 3 0V_TX U1102 Pin 20 21 24 26 2 85V_SYNTH U1101 Pin 2 Vout U1101 Pin 13 14 15 16 I Q Data U1102 Pin43 DCN RF_OUT 40 Z 3 X B O X C O M ...

Page 41: ...I Q Level Appears YES Check U1101 Replace U1102 NO Output Level is Appear YES Check U1102 Pin 43 49 Replace U1102 Waveform PCS MCM Circuit is OK See next page to check Quintplexer Mobile SW Figure 4 2 17 RF_OUT WAVEFORM OF PCS YES Replace U1102 YES Replace U1102 Check U1102 Pin 13 14 15 16 Figure 4 2 15 TX I Q DATA WAVEFORM Figure 4 2 16 RF_OUT WAVEFORM OF DCN 41 Z 3 X B O X C O M ...

Page 42: ...NT U1004 Pin6 USPCS Tx U1004 Pin5 DCN Tx U1004 Pin4 GPS U1004 Pin3 USPCS Rx U1004 Pin2 DCN Rx Level is Appear YES NO Level is Appear NO Redownload SW and Recalibration Check U1003 Pin4 YES Replace U1003 Check Quintplexer Check U1004 Pin2 Pin3 Level is Appear YES NO Check U1004 Pin1 Replace U1004 NO Level is Appear YES Replace Quintplexer Check U1004 Pin5 Pin6 42 Z 3 X B O X C O M ...

Page 43: ...Figure 4 3 1 PMIC MAX1827ETL T FUNCTIONAL BLOCK DIAGRAM 4 3 Logic Part Trouble 43 Z 3 X B O X C O M ...

Page 44: ...ure 4 3 2 Power circuit diagram Figure 4 3 3 MAX1827 POWER MANAGEMENT SECTION 2 6V_MSMA U4101 MAX1827 L4600 2 85V_TCXO 1 86V_MSMC 2 85V_MSMP C4106 PS_HOLD PWR_ON_SW 4 3 1 Power On Trouble R4101 R4106 C4104 L4101 44 Z 3 X B O X C O M ...

Page 45: ...ewhere The Phone will power on Replace the main board Check the contact of power key or dome switch Push power on key and check the level change of U4101 PWR_ON_SW Check the voltage of the following port at U4101 1 86V_MSMC 2 85V_MSMP 2 6V_MSMA 2 85V_TCXO Logic level at PWR_HOLD of U4101 High Does it work properly Does it work properly YES YES YES YES NO NO NO NO NO YES YES 45 Z 3 X B O X C O M ...

Page 46: ... Test Points Figure 4 3 4 CHARGER CIRCUIT PART Block Diagram Figure 4 3 5 MAX8629 CHARGING CONTROL BLOCK Circuit Diagram CON5301 V_CHAR U4101 VPWR Pin28 Travel Adapter Battery C4102 D4101 CHAR_MON C4120 46 Z 3 X B O X C O M ...

Page 47: ...at V_CHAR of U4101 5V 0 1V Voltage of CHAR_MON 1 4V YES YES NO NO YES Replace U4101 Is the battery charged NO The battery may have the problem Change the battery and try again Charging will operate properly YES Voltage of pin 28 CON5301 VBATT NO YES Re soldering L5301 or Q5304 SETTING Connect the battery and the charging adaptor TA to the phone 47 Z 3 X B O X C O M ...

Page 48: ...eceiver Trouble Test Points Figure 4 3 6 RECEIVER PART Circuit Diagram Figure 4 3 7 RECEIVER PART Block Diagram Figure 4 3 8 RECEIVER CODEC BLOCK R4210 U4202 R4209 R4204 R4203 R4208 C4208 48 Z 3 X B O X C O M ...

Page 49: ...MSM6050 is out of order Re soldering R505 R506 Check the contact state of Receiver connector Replace the Receiver The Receiver will work properly Figure 4 3 9 AC VOLTAGE OF THE SIGNALS WAVEFORM Waveform R4210 Com_Spk R4209 Com_Spk RMS 349 mV RMS 349 mV AC voltage of the signals SETTING After initialize 5515C Test Cellular or US PCS YES 49 Z 3 X B O X C O M ...

Page 50: ...place the Receiver The Receiver will work properly Figure 4 3 10 AC VOLTAGE OF THE SIGNALS WAVEFORM SETTING After initialize 5515C Test Cellular or US PCS Voltage across C4208 Is over 2 6V Check the soldering of PIN B4 of U4202 Change Main Board Internal Pattern is opened Re soldering U4202 NO NO Yes Yes NO Check the signal level of PIN A2 of U4202 Check the soldering R4208 Re soldering R4208 NO N...

Page 51: ...3 4 USB Interface Trouble Test Points Figure 4 3 11 USB TRANCEIVER And USB RESONATOR PART Block Diagram Figure 4 3 12 USB Transceiver Block MAX1827 X200 U4101 USB D USB D 5V_USB R2008 51 Z 3 X B O X C O M ...

Page 52: ...Circuit Diagram Figure 4 3 13 USB TRANCEIVER Figure 4 3 14 USB RESONATOR Waveform D D Figure 4 3 15 USB Interface waveform 52 Z 3 X B O X C O M ...

Page 53: ... the signal level at R4110 R4111 Is it almost 3 3v YES NO Check the soldering R4110 R4111 Re soldering Replace CON5301 The USB interface will work properly X2001 is working Oscillator frequency 48 MHz YES NO Check the soldering X2001 R2008 Re soldering Replace X2001 R2008 NO YES NO YES 53 Z 3 X B O X C O M ...

Page 54: ... 5 Speaker Trouble Test points Circuit Diagram Figure 4 3 16 SPK PHONE AUDIO AMP PART Figure 4 3 17 LCD SPK CONNECTOR PART Figure 4 3 18 SPK PHONE AUDIO AMP R4210 U4202 R4209 R4208 C4208 R4204 R4203 54 Z 3 X B O X C O M ...

Page 55: ...PIN C1 of U4201 Check the soldering C4204 R4990 Check the soldering of PIN C3 of U4201 Re soldering Replace MSM Check the signal level of PIN A2 C2 of U4201 Check the Soldering of R4203 R4204 Check the state Of contact of speaker Speaker will work properly Re soldering R4203 4204 Spk Connector NO NO NO NO NO NO Yes Yes Yes Yes Yes Yes Checking Flow Yes Yes Replace MSM NO Replace U4201 55 Z 3 X B O...

Page 56: ... Circuit Diagram Figure 4 3 20 MIC FILTER BIAS PART Figure 4 3 19 MIC INPUT PART Figure 4 3 21 MIC MIC FILTER 4 3 6 MIC Trouble U4002 MIC Input MIC Filter Network C2022 R2012 C2024 MIC Filter 56 Z 3 X B O X C O M ...

Page 57: ...f MIC Is It a few tens mV Replace the microphone Check the soldering of C2022 C2024 Re solder C2022 C2024 Check the soldering of MIC Filter Part Re solder MIC Filter part MIC will work properly Checking Flow Waveform Yes Yes Yes Yes No No No No No Figure 4 3 22 Graph Yes SETTING After initialize 5515C Test Cellular or US PCS 57 Z 3 X B O X C O M ...

Page 58: ...ector on Main PCB Figure 4 3 25 LCD MOTOR CONTACT PART MOTOR Connector M M FPCB TOP FPCB BOTTOM CON6002 Pin 57 CON6002 Pin 57 CON6003 Pin 19 Figure 4 3 24 FPCB 3 1V_MOTOR Main Board FPCB BOTTOM FPCB TOP Figure 4 3 26 3 1V_MOTOR LINE CON6002 CON6003 CON6002 58 Z 3 X B O X C O M ...

Page 59: ...d Check Pin 19 of Con6003 on FPCB Is it High Replace FPCB Check the state of Contact of Vibrator Re contact vibrator Replace Vibrator Vibrator will Work properly No No No Yes Yes Yes Yes Connect LCD to FPCB And check M Is it High Replace LCD No Yes SETTING Vibrate at Volume of Sounds menu 59 Z 3 X B O X C O M ...

Page 60: ...oints Figure 4 3 27 KEYPAD BACK LIGHT PART Figure 4 3 28 KEYPAD Back Light Circuit LED5204 LED5207 LED5217 LED5202 LED5208 LED5216 LED5211 LED5215 LED5210 LED5206 LED5219 LED5209 LED5201 LED5212 LED5205 LED5203 LED5218 60 Z 3 X B O X C O M ...

Page 61: ...212 LED5215 5219 working Q5201 R5206 is working BACKLIGHT WILL WORK PROPERLY Charge of Change Battery and try again Check the soldering of each R or replace LED s not working Check the condition of Q5201 R5206 If problem Change Q5201 R5206 No No No Yes Yes Yes 61 Z 3 X B O X C O M ...

Page 62: ...Earphone Trouble Test Points Circuit Diagram Figure 4 3 29 EAR MIC JACK PART CON4001 Figure 4 3 30 EAR MIC JACK PART R4001 R4003 C4002 Q4001 C4001 4 3 2 1 5 R4002 R4007 R4005 R4004 C4004 62 Z 3 X B O X C O M ...

Page 63: ... and try again No No Yes Yes Set the audio part of the test equipment to echo mode Earphone detect problem Audio path problem Can you hear your voice from the earphone Change Earphone Set the audio part of the test equipment to continuous wave mode Earphone receiving Path problem Can you hear the sound from the earphone Earphone sending path problem 1 4 2 3 Yes No Yes No Yes Yes Yes Yes 63 Z 3 X B...

Page 64: ...m Level of pin 4 of CON4001 about 2 6V No Yes 1 4 Earphone detect problem Earphone sending path problem Earphone sending path problem 3 Level pin4 of CON4001 is about 2 6V Level of C2025 is About a few tens or hundreds VAC Re solder C2025 Does it work well Re download software Does it work well 4 Change main board No No Yes Yes Yes Yes No No Change main board Change main board 64 Z 3 X B O X C O M...

Page 65: ...rom MSM D 0 16 LCD_RESET A 7 LCD_CS WR Check point The assembly status of the LCD Module The Soldering of connector The Soldering of EMI Filters FPCB Figure 4 3 31 LCD CONNECTOR PART Test Points U6003 CON6002 U6002 U6001 65 Z 3 X B O X C O M ...

Page 66: ...Circuit Diagram Figure 4 3 32 LCD 40PIN CONNECTOR Figure 4 3 33 MAIN 60PIN CONNECTOR 66 Z 3 X B O X C O M ...

Page 67: ...properly Change the FPCB No No No Yes Yes Yes Re soldering U6001 U6002 U6003 Check CON6003 soldering Re soldering CON6003 Soldering U6001 U6002 U6003 Is good No Yes Yes Checking Flow Does LCD work properly Change the LCD Module LCD Display will work Does LCD work properly Yes Yes No Yes No Yes Re soldering L6001 No 67 Z 3 X B O X C O M ...

Page 68: ...t to human exposure to RF energy Over 120 scientists engineers and physicians from universities government health agencies and industry after reviewing the available boy of research developed this updated Standard In March 1993 the US Federal Communications Commission FCC proposed the adoption of this updated Standard The design of your phone complies with this updated Standard Of course if you wa...

Page 69: ...erating and entertainment system in motor vehicles Check with the manufacturer or its representative to determine if these systems are adequately shielded from external RF energy You should check with the manufacturer of any equipment that has been added to your vehicle Consult the manufacturer of any personal medical devices such as pacemakers hearing aids etc to determine if they are adequately ...

Page 70: ...or chemical transfer or storage facilities areas where the air contains chemical or particles such as grain dust or metal powders and any other area where you would normally be advised to turn off your vehicle engine Do not transport or store flammable gas liquid or explosives in the compartment of your vehicle which contains your phone or accessories Vehicles using liquefied petroleum gas such as...

Page 71: ...age A message on the Access Channel generated to reply to a message 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 ...

Page 72: ...command from the base station AWGN Additive White Gaussian Noise Bad Frames Frames classified as erasures frame category 10 or9600bps frames primary traffic only with bit errors frame category 9 See also Good Frames Base Station A station in the Domestic Public Cellular Radio Telecommunications Service other than a mobile station used for communicating with mobile stations Depending upon the conte...

Page 73: ...n the Control Filler Message that specifies the maximum authorized power level for a mobile transmitting on an analog reverse control channels Convolution Code A type of error correcting code A code symbol can be considered as the convolution of the input data sequence with the impulse response of a generator function CRC See Cyclic Redundancy Code Cyclic Redundancy Code CRC A class of linear erro...

Page 74: ...rgy of an information bit Ec I0 The ratio in dB between the pilot energy accumulated over one PN chip period Ec to the power spectral density in the received bandwidth Io Effective Radiated Power ERP The transmitted power multiplied by the antenna gain referenced to a half wave dipole Electronic Serial Number ESN A 32 bit number assigned by the mobile station manufacturer uniquely identifying the ...

Page 75: ...traffic or signaling traffic and whether there are detected error in the frame Frame Offset A time skewing of Traffic Channel frames from System Time in integer multiples of 1 25 ms The maximum frame offset is 18 75 ms Frame Quality Indicator The CRC check applied to 9600 bps and 4800 bps Traffic Channel frames Global Positioning System GPS A US government satellite system that provides location a...

Page 76: ... sequence with period 242 1 that is used for scrambling on the Forward CDMA Channel and spreading on the Reverse CDMA Channel The long code uniquely identifies a mobile station on both the Reverse Traffic Channel and the Forward Traffic Channel The long code provides limited privacy The long code also separates multiple Access Channels on the same CDMA channel See also Public Long Code and Private...

Page 77: ...eristics such as slotted operation and transmission power Mobile Station Identification Number MIN The 34 bit number that is a digital representation of the 10 digit directory telephone number assigned to a mobile station Mobile Station Originated Call A call originating from a mobile station Mobile Station Terminated Call A call received by a mobile station not to be confused with a disconnect or...

Page 78: ...tored in the mobile station Numeric Information Numeric information consists of parameters that appear as numeric fields in message exchanged by the base station and the mobile station and information used to describe the operation of the mobile station OLC See Overload Class CDMA or Overload Control analog Optional Field A field defined within a message structure that is optionally to the message...

Page 79: ...ot Channel An unmodulated direct sequence spread spectrum signal transmitted continuously by each CDMA base station The Pilot Channel allows a mobile station to acquire the timing of the Forward CDMA Channel provides a phase reference for coherent demodulation and provides a means for signal strength comparisons between base station for determining when to handoff Pilot PN Sequence A pair of modif...

Page 80: ...process by which a mobile station identifies its location and parameters to a base station Registration Zone A collection of one or more base stations treated as a unit when determining whether a mobile station should perform zone based registration Release A process that the mobile station and base station use to inform each other of call disconnect The set of all allowable pilot offsets as deter...

Page 81: ...Text Delivery Digital Paging i e Call Back Number CBN and Voice Mail Notification VMN SID See System Identification Signaling Tone A 10kHz tone transmitted by a mobile station on an analog voice channel to 1 confirm orders 2 signal flash requests and 3 signal release requests Signal Traffic Control message that are carried between the mobile station and base station on the Traffic Channel See also...

Page 82: ...channel 32 in the Forward CDMA Channel which transports the synchronization message to the mobile station Sync Channel Superframe An 80ms interval consisting of three Sync Channel frames each 26 666 ms in length System A system is a cellular telephone service that covers a geographic area such as a city Metropolitan region country or group of countries See also Network System Time The time referen...

Page 83: ...ime reference by nearly all commonly available time and frequency distribution systems i e WWW WWVH LORAN C Transit Omega and GPS UTC Universal Temps Coordine See Universal Coordinated Time Voice Channel See Analog Voice Channel Voice Mobile Attenuation Code VMAC A 3 bit field in the Extended Address Word commanding the initial mobile power level when assigning a mobile station to an analog voice ...

Page 84: ... O M 60 Pin LCD Doesn t work LCD Side key Doesn t work side key button Key LED 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5215 5216 5217 5218 5219 Microphone connector PX240 _MAIN_Rev1 0 SPFY0118501 ...

Page 85: ... MCM No Service Low Sensitivity No Rx cal Ear jack Does t work Ear Mic Tx MCM No Service Low Tx Power No Tx cal VCTCXO No Service No power on MSM6050 No Power on Sleep Crystal Power on unable Camera DSP Camera LCD doesn t work Memory No Booting PMIC No Booting No Charge LCD Charge Pump No LCD Light ...

Page 86: ...Z 3 X B O X C O M TX RX PX240 ...

Page 87: ...Z 3 X B O X C O M TX RX Audio MIC Audio Earphone Audio Receiver Speaker PX240 ...

Page 88: ...Z 3 X B O X C O M PX240 ...

Page 89: ...Z 3 X B O X C O M Audio MIC Audio Earphone Audio Receiver Speaker PX240 ...

Page 90: ...Z 3 X B O X C O M PX240 ...

Page 91: ...Z 3 X B O X C O M PX240 ...

Page 92: ...Z 3 X B O X C O M PX240 ...

Page 93: ...Z 3 X B O X C O M ...

Page 94: ...OR TDK ECZH0001501 1608 1u 80 20 U6001 U6002 U6003 U6004 U6005 CM1400 03CS EMI FILTER CAMD SFEY000720 5 U4001 EM 1681 FT HALL EFFECT SWITC ASAHI KASELEUSY025000 1 2 1X2 1X0 65 C2022 C2024 GRM36X5R223K16P CHIP CAPACITOR MURATA ECCH0000172 1005 22n 10 L6001 HB 1M1005 601JT BEAD INDUCTOR CERATECH SFBH0000901 1005 600 R5012 R5013 R5014 R5015 ICVL0505101V150FRVARISTOR INNOCHIPS SEVY000360 4 1005 5 6V 1...

Page 95: ...n 80 20 U6014 CP0603A0836BNTR COUPLER AVX KYOCERA SCDY000310 1 0 85X1 6X0 7 X2001 CSTCW48M0X11047 R48M RESONATOR MURATA EXRY000110 1 F1301 DSA321SA 19 20M VCTCXO DAISHINKU EXSK000570 1 C5301 F950J476MQAAQ2 TANTAL Q CAPACITO NICHICON ECTH000290 1 3216 47u 6 3V 20 C1526 C1537 C2089 C310 1 C3203 GRM155R60J105KE19D CHIP CAPACITOR MURATA ECCH000490 9 1005 1u 10 C2005 C4603 GRM155R60J474KE19 CHIP CAPACI...

Page 96: ...J273 RESISTOR ROHM ERHZ000045 1 1005 27k 5 R4112 MCR01MZSJ333 RESISTOR ROHM ERHZ000046 1 1005 33k 5 R3102 R3103 MCR01MZSJ472 RESISTOR ROHM ERHZ000048 2 1005 4 7k 5 R7700 R7701 R7702 MCR01MZSJ473 RESISTOR ROHM ERHZ000048 3 1005 47k 5 R1301 MCR01MZSJ510 RESISTOR ROHM ERHZ000049 1 1005 51 5 R2017 MCR01MZSJ514 RESISTOR ROHM ERHZ000049 1 1005 510k 5 R4002 MCR01MZSJ561 RESISTOR ROHM ERHZ000049 1 1005 56...

Search results

Summary of Contents for LG- PX240

Reviews:

Related manuals for LG- PX240

Brands by name

Popular brands

LG LG- PX240, Service Manual

Search results

Summary of Contents for LG- PX240

Reviews:

Related manuals for LG- PX240

Brands by name

Popular brands