LG LG500 Service Manual Download Page 35

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5.2.10 Rx Sensitivity Trouble(E GSM)

START

(40CH, Sector Power-60dBm)

Rework on Calibration

(over G_MAGIC 200)

Check SW300 and

circumference Circuit

Check BPF401 and

circumference Circuit

Check U402 and

circumference Circuit

Check BPF402 and

circumference Circuit

Check U401 and

circumference Circuit

Check BPF404 and

circumference Circuit

Check BPF404 and

circumference Circuit

Check U401 and

circumference Circuit

SW300

pin9 RF signal is over

-63dBm

BPF401

pin5 RF signal is over

-65dBm

U402 pin27

RF signal is over

-50dBm

BPF 402

pin4,6 RF signal is over

-55dBm

U402 pin20

LO signal is over

-10dBm

BPF404

pin5.6 IF is signal over

-40dBm

BPF404

pin1,2 IF signal is over

-46dBm

U402 pin37

IF signal is over

-10dBm

YES

NOTE : SW300 : Antenna Switch

BPF400 : RF SAW Filter

U402

: TRF 6053

U401 :

PLL

BPF403 : RF SAW Filter

BPF404 : IF SAM Filter

★

Must use high frequency
probe.

Summary of Contents for LG500

Page 1: ...GSM Phone SERVICE MANUAL MODEL LG 500 SERVICE MANUAL MODEL LG 500 ...

Page 2: ...wnload Procedure 20 5 1 3 Test Equipment 24 5 1 4 Test Equipment Setup 24 5 2 Test Method 25 5 2 1 Power On Trouble 25 5 2 2 MIC Trouble 26 5 2 3 RECEIVER Trouble 27 5 2 4 Melody Trouble 28 5 2 5 LCD Trouble 29 5 2 6 Charge Trouble 30 5 2 7 Vibrator is not working 31 5 2 8 Backlight is not Working 32 5 2 9 TX POWER Trouble 33 5 2 10 Rx Sensitivity Trouble E GSM 34 5 2 11 Rx Sensitivity Trouble DCS...

Page 3: ...on LG 500 supports Full Rate FR Enhanced Full Rate HFR and Half Rate HR For easy text is implemented and WAP protocol is adopted for internet connection 2 Specification Feature 2 1 Product Name LG 500 2 2 Supporting Standard 2 3 Main Parts GSM Solution Item Feature Supporting Standard GSM 900 DCS 1800 Dual Band E GSM Phase 2 and Phase 2 SIM Toolkit Class 1 2 3 Frequency Range E GSM TX 880 915 MHz ...

Page 4: ...Text Language All available languages 2 languages per market Predictive word input Phone Book 1 Phone Numbers for 1 Name 500 Phone numbers Voice Recording up to 90 seconds Dialing up to 20 names Schedule Manager Calendar Day Scheduler Calendar includes Weekly Scheduler lunar Chinese Game Applied Five games Clock Current time World time Alarm Calculator General calculator WAP Version 1 1 AUR Browse...

Page 5: ... Up to 150 hours 600 mAh on network service Charging time 2 hr RX sensitivity GSM 900 108 dBm Conducted emission test DCS 1800 108 dBm TX output power GSM 900 33 dBm Class4 GSM DCS 1800 30 dBm Class1 DCS SIM card type Plug In SIM 3V 5V Display Full Graphic type No Hard Icon Pixels 128 x 90 Line 9lines 8 X 8 Size Active 29X 23 mm 5lines 8 X 12 4lines 8 X 16 pixels Back light Single LED X 4 Pure Gre...

Page 6: ...zzer Applied Built in Buzzer Function by Using Function Speaker Phone Melody IC C Mike Built in Receiver Built in Speaker Phone Built in Travel Adapter Built in Accessories Belt Clip Some optional items may be Cigarette Lighter Adapter basic items depending on Data communication Kit circumstances Extended Battery 1 050mAh Pack DeskTop Charger Handsfree Car Kit Portable Handsfree Ear Phone ...

Page 7: ...atioal Access Applied Normal Features Dialled Number 10 Received Number 10 Missed Number 10 Scratch Pad Memory 1 Call Management Call Waiting Call Hold Call Swap Call Retrieve Voice Recording in call Any Key Answer Auto Answer Speaker Phone Closed User Group Automatic Redial Sending Number It depends on network and subscription Call divert Speed Dialling Last Number Redial Multi party Call Confere...

Page 8: ...ore and Recall In Numeric order Alpha Store In Alphabetical order Alpha Recall In Alphabetical order Displayed in alpha or number In Alpha Numeric order Copy Move SIM to Phone Phone to SIM Fixed Dial Number Barred Dial Number Service Dial Number Caller Group E mail Entry Call Cost Last Call Timer Last Call Charge Units Total Call Timer Total Charge Units Visible or Audible Call for Time Cost Indic...

Page 9: ...tract Number from Message Message Status Message Unread Indicator Settable Message Center Number Reply Path Validity Alerting for received visible audible messages Voice Mail Settable Voice Mail Center Number Message Protocol Normal Fax National Paging E mail X400 ERMES Voice Multi Band Supporting standard GSM 900 E GSM DCS1800 Miscelleous Development Test Facility Function Field Test Facility Dis...

Page 10: ...Local Time Number of Selectable Cities 24 Cities Calculator Operator Addition Substraction Multiplication Division Unit Convert Length Conversion Weight Conversion Volume Conversion Surface Conversion PC Sync Phone Book Sync Message Sync Scheduler Sync Game Corsair Crazy Race Diamond King Stone Axe Black Jack ...

Page 11: ...Indicator Light 2 Earpiece 3 Record Key 4 Display Screen 5 Up Down Side Key 6 Soft Left Key 7 Easy Key 8 Send Key 9 Numeric Keys 10 Star Key 11 Active Flip 12 Antenna 13 Handsfree Connector 14 Soft Right Key 15 Navigation Keys 16 END PWR Key 17 Hash Key 18 Microphone ...

Page 12: ...press this key without entering a number your phone shows the most recently dialled number Numeric Keys These keys are used mainly to dial in standby mode and enter numbers or characters in editing mode When you press these keys for a long time Use to call your voice mail box Use to make international call Use for speed dials Star Key Used to enter to vibration mode by pressing this key for a long...

Page 13: ...y of Upper Case 1 Push the battery locker and then remove the battery cover 2 Pull the battery downward and lift it up 3 Use your thumb to pull down the battery locker hard Figure 4 1 Removing the Battery cover and the Battery Upper Case Lower Case Battery Cover ...

Page 14: ...e the Lower case is detached from the Upper case twist the Lower case to the right for disassembling a hook Then twist it again to the left for disassembling the other hook Finally take out the Lower case from the Upper case Figure 4 2 Disassembling of Upper and Lower Case ...

Page 15: ...a type driver carefully to lift up the Lower case of the vibrator spindle Assembly Make sure the terminal of Speaker is being attached towards the Antenna When inserting the earphone cap place its upper part into the hole first And from the inside use a long nose to hold and pull it Figure 4 3 Removing the Speaker and Vibrator ...

Page 16: ...ft it up to remove the battery spring 4 Also for the SIM card cover use type driver to remove it 5 Release the Volume BTN by pushing it with opposite force onto each side And for the Recording BTN just push one its side to release it Figure 4 4 Removing the Battery spring and Sim Card cover ...

Page 17: ...up the rubber part of multi key and then the Dial BTN will be disassembled from the Lower Case 4 While holding the Lower case with your left hand use your right hand to twist the flip cover to the hinges Assembly Leave the flip cover open and insert one side of the flip cover into the hinge as shown in fig 4 6 Then twist the flip cover when inserting the other end DO NOT use too much force onto it...

Page 18: ...hown in fig 4 7 2 Use a pin to release the Receiver Figure 4 7 Removing the Receiver 3 Insert a type driver between the hinge and the Lower case and lift it up to remove the hinge 4 See the cover from the A direction shown in fig 4 8 and assemble a pink hinge on its left and a green hinge on its right Figure 4 8 Removing the Hinge ...

Page 19: ...odule into guide holes of Main PCB and push it in until it clicks When placing Backup battery onto Battery hold make sure the battery poles are facing the right direction Figure 4 9 Removing the LCD 2 Use a type driver to push away the antenna hook and then disassemble the Antenna Assembly Push the Antenna into the hole until it clicks Figure 4 10 Removing the Antenna ...

Page 20: ...e and push it down 2 Connect the lead wire of Speaker and Vibrator to the Main PCB Make sure that the poles are facing right directions 3 As shown in fig 4 11 insert Lower case to the hooks on the top of Upper case 4 Finally tighten the cases with 4 screws Figure 4 11 Reassembling Upper Case and Lower Case ...

Page 21: ...nload software of LG 500 the following working environments should be prepared LG 500 Data Link Kit DK 10G that is connected to COM1 or COM2 serial port in the Desktop or Notebook PC LG 500 Data Kit Download Monitor Program that is copied to Desktop PC or Notebook PC Target SW downloaded to LG 500 mobile phone Note Target SW means any necessary software to be downloaded to the mobile phone Warning...

Page 22: ... in PC 2 Execute monitor632 exe And then select the Target Menu shown in Fig1 Then choose Connect in the Target Menu Figure 1 3 A table will be displayed as shown in Fig 2 Then press the arrow button and choose a correct serial port And press OK button Figure 2 5 Data Kit Test Method ...

Page 23: ...lowing window shown in Fig 3 is displayed connect LG 500 Phone to Data Link Kit DK 10G and power on LG 500 If the connection is succeeded the following screen will show the contents as shown in Fig 4 Figure 3 Figure 4 ...

Page 24: ...23 5 Click on Flash on the top menu and select Erase and Program Appli Only item as shown in Fig 5 Figure 5 6 Finally choose the target SW that you want to download And then you can see the following window in Fig 6 Figure 6 ...

Page 25: ... succeeded then the following window is shown Figure 7 5 1 3 Test Equipment 1 Power Supply 2 HP8922 3 Spectrum Analyzer 4 Oscilloscope 5 1 4 Test Equipment Setup Power Supply RS232 Serial Cable I O Cable Power Cable RF Cable with test test ...

Page 26: ...e level of battery The level is higer than 3 32V The level is high 3V Check the level of U605 PIN8 ON OFF Charge the battery Check the battery Then the phone is powered on properly Check the LCD module END Power on sequence is not executed properly Try again If the result is same change U803 chipset YES NO NO YES ...

Page 27: ...e point U803 PIN9 R601 The level is 2 0V Check the signal level at the U601 PIN5 and U602 PIN5 after putting audio signal in MIC A few hundreds of mV of signal levels are measured Check the connectivity of R601 and 602 Check the MIC END Replace the U601 or U602 which does not have proper level YES YES NO NO ...

Page 28: ...ver is not working Connect the Phone to Network Analyzer Check the signal level at the U604 PIN4 while putting audio signal in MIC Check the connectivity of Receiver component END Check the receiver A few hundreds of mV of signal levels are measured NO YES ...

Page 29: ...r The connection is OK Check the level of U605 PIN5 VCC3V The level is high 3V Connect the speaker to the phone properly Check whether the melody signal a few hundreds mV is out from the U603 12 or U603 11 Replace the LDO U605 Replace the Melody IC U603 END YES YES YES NO NO NO ...

Page 30: ... module END Normal state contact of LCD module with LCD connector on PCB Reassemble LCD module with LCD connector LCD Connector Re Soldering Replace the U605 LCD connector is well soldered onto PCB The LCD Driver source voltage is 2 8V U605 PIN6 YES YES YES NO NO NO U605 LDC Component ...

Page 31: ... Voltage is between 3 2V 4 2V The T501 Voltage is between 0 65 0 9V Replace the T501 Replace the D501 Replace the R508 Re Mount J502 The D501 Voltage is lower than 0 3V The R508 Voltage is lower than 0 12V J502 is well connected to PCB Re Download S W END The TA CLA DTC Voltages are equal to 5 2V 800mA Reassemble Battery Pack Replace the Battery Pack Replace one of TA CLA and DTC ...

Page 32: ...2 Check Replace the R730 L701 C701 In the Test mode select Baseband Test then select Vibrator Mode J701 is well connected to the Vibrator R732 Voltage Level is High approx 3V T702 Collector Voltage Level is High Approx 3V Voltage level of R730 L701 C701 are Low YES YES YES YES NO NO NO NO NOTE To get to the Test mode press 2945 then hold down key ...

Page 33: ...prox 3V Replace Battery Replace D701 D708 Replace D701 D708 Voltage value of LED PIN1 is same as the voltage value of battery Replace the Battery Voltage value of LED PIN1 is same as voltage value of Vat R723 is well connected Re Mount the R718 R723 R724 Defected Key backlight Defected LCD backlight YES NO NO NO NO NO NO YES YES YES YES YES NOTE To get to the Test mode press 2945 then hold down ke...

Page 34: ...nal of U401 PIN10 is over 5dBm GSM at 1229 4MHz DCS at 1566 8MHz The Voltage level of U403 PIN7 is lower than 0 2V GSM and hight than 2 7V DCS Modulated Tx signal of U403 GSM pin6 DCS pin10 about 8dBm GSM902 4MHz DCS 1747 8MHz Modulated Tx signal of U302 GSM pin12 DCS pin16 is about 0dBm GSM902 4MHz DCS 1747 8MHz Amplified Tx signal of U302 GSM PIN4 DCS PIN8 is about 30dBm Input power of SW300 GSM...

Page 35: ...nd circumference Circuit Check U401 and circumference Circuit SW300 pin9 RF signal is over 63dBm BPF401 pin5 RF signal is over 65dBm U402 pin27 RF signal is over 50dBm BPF 402 pin4 6 RF signal is over 55dBm U402 pin20 LO signal is over 10dBm BPF404 pin5 6 IF is signal over 40dBm BPF404 pin1 2 IF signal is over 46dBm U402 pin37 IF signal is over 10dBm YES NO NO NO NO NO NO NO NO YES YES YES YES YES...

Page 36: ...BPF404 and circumference Circuit Check U401 and circumference Circuit BPF400 pin2 RF signal is over 65dBm U402 pin28 RF signal is over 50dBm BPF403 pin4 6 RF signal is over 55dBm U402 pin20 LO signal is over 10dBm BPF404 pin5 6 IF signal is over 45dBm BPF404 pin1 2 IF signal is over 50dBm U402 pin37 IF signal is over 10dBm Rework on Calibration over G_MAGIC 200 YES YES YES YES YES YES YES YES YES ...

Page 37: ... 36 6 PCB Diagram Testpoint Description ...

Page 38: ... 37 6 PCB Diagram Testpoint Description ...

Page 39: ... 38 ...

Page 40: ...er Anti aliasing Filter Sigma Delta Modulator Sigma Delta Modulator SINC Filter SINC Filter FIR Filter FIR Filter Offset Reg Offset Reg Fs 6 5MHz Fs 1 08MHz Fs 270 8kHz Timing Control Offset Reg Low pass Filter Low pass Filter 10 bit DAC 10 bit DAC 6 bit DAC 6 bit DAC Burst Buffer1 Burst Buffer2 GMSK Modulator Offset Reg 16X270kHz 270kHz from TSP from BSP to BSP Downlink Block Uplink Block Baseban...

Page 41: ... 40 7 2 RF Block Diagram ...

Page 42: ... 41 8 Schematic Diagram 8 Schematic Diagram ...

Page 43: ... 42 8 1 Baseband ...

Page 44: ... 43 8 Schematic Diagram 8 1 1 Baseband ...

Page 45: ... 44 8 1 2 Memory devices ...

Page 46: ... 45 8 Schematic Diagram 8 1 3 Audio ...

Page 47: ... 46 8 1 4 MMI ...

Page 48: ... 47 8 Schematic Diagram 8 2 RF top schematic 8 2 1 Baseband parts in RF ...

Page 49: ... 48 8 2 2 Pascal RF ...

Page 50: ... 49 8 Schematic Diagram 8 2 3 Hitachi PA ...

Page 51: ... 50 ...

Page 52: ...1 1 MICROPHONE M10 MBJA0000101 1 BUTTON DIAL M11 MBFJ0000101 1 BRACKET RECEIVER M12 SURY0002901 1 RECEIVER M13 MPBG0000101 1 PAD LCD M14 SVLM0000701 1 LCD MODULE NO PART NO Q TY DESCRIPTION M15 ADCA0000101 1 DOME ASSY METAL M16 SAFY0011201 1 PCB ASSY MAIN M17 MPBZ0002601 1 PAD M18 MBJN0000101 2 BUTTON VOLUME M19 MBJL0000101 1 BUTTON SIDE M20 GMZZ0000504 1 SCREW MACHINE M21 MBFK0000101 1 BRACKET SP...

Page 53: ...0101 CAP EARPHONE JACK LG 500 EUADG BK SILICONE RUBBER M27 2 MHDA MHDA0000101 HANDSET UPPER LG 500 EUADG BK GE141R 70566 M26 2 MHGB MHGB0000101 HOLDER CARD LG 500 EUADG SIM CARD HOLDER M28 2 MICA MICA0000101 INSERT FRONT LG 500 EUADG INSERT NUT 2 MLEA MLEA0000101 LOCKER BATTERY LG 500 EUADG BK GE141R 70566 M31 2 MSDB MSDB0000101 SPRING COIL LG 500 EUADG M30 2 MSDD MSDD0000101 SPRING PLATE LG 500 E...

Page 54: ...V K X 1005 R TP 3 C321 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 C322 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 C323 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 C325 ECCH0000117 CAPACITOR 27PF 50V J NP0 1005 R TP 3 C326 ECCH0000177 CAP CERAMIC CHIP 0 68 pF 50V C NP0 TC 1005 R TP 3 C400 ECCH0000379 CAP CERAMIC CHIP 2 2 uF 6 3V K X5R HD 2012 R TP 3 C406 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 C407 ECCH00001...

Page 55: ... 16V K X7R HD 1608 R TP 3 C502 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 C503 ECCH0000122 CAPACITOR CHIP CERAMIC M L TC 47PF 50V J NP0 1005 R TP 3 C504 ECCH0000130 CAPACITOR CHIP CERAMIC M L TC 150PF 50V J SL 1005 R TP 3 C505 ECTZ0003001 CAP TANTAL CHIP MAKER 595D336X0016B2T 33 uF 16V D STD ETC R TP 3 C506 ECCH0000179 CAP CERAMIC CHIP 22 nF 16V K X5R HD 1005 R TP 3 C507 ECCH0000402 CAP CERAMIC CHIP ...

Page 56: ... 10V K X5R HD 1005 R TP 3 C655 ECCH0000128 CAPACITOR CHIP CERAMIC M L TC 100PF 50V J NP0 1005 R TP 3 C656 ECCH0000128 CAPACITOR CHIP CERAMIC M L TC 100PF 50V J NP0 1005 R TP 3 C657 ECCH0000128 CAPACITOR CHIP CERAMIC M L TC 100PF 50V J NP0 1005 R TP 3 C660 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 C701 ECCH0000124 CAPACITOR CHIP CERAMIC M L TC 56PF 50V J NP0 1005 R TP 3 C710 ECCH0000182 CAP CERAMIC C...

Page 57: ...KL 3 D712 EDLH0003201 DIODE LED CHIP E1S02 3G0A7 GREEN ETC R TP 3 0 1 5 LCD BACKL 3 D713 EDLH0003201 DIODE LED CHIP E1S02 3G0A7 GREEN ETC R TP 3 0 1 5 LCD BACKL 3 D714 EDLH0003201 DIODE LED CHIP E1S02 3G0A7 GREEN ETC R TP 3 0 1 5 LCD BACKL 3 D715 EDTY0002301 DIODE TVS P0402FC05C FLIP CHIP 5 0 V 250 W R TP 1 02 0 51 3 D716 EDTY0002301 DIODE TVS P0402FC05C FLIP CHIP 5 0 V 250 W R TP 1 02 0 51 3 D722...

Page 58: ...J 100 nH J 1005 R TP 3 L702 ELCH0005009 INDUCTOR CHIP HK1005R10J 100 nH J 1005 R TP 3 MCBA MCBA0000101 CAN SHIELD RF 3 N300 SCHY0000101 COUPLER RF HYBRID LDC15D190A0007A 19 0 dB 0 35 dB 24 0 dB 2 0 1 25 3 R300 ERHY0000213 RESISTOR 47 OHM 1 16 W 1005 5 D R T 3 R301 ERHY0000223 RESISTOR CHIP 150 OHM 1 16 W 1005 5 D R 3 R302 ERHY0000223 RESISTOR CHIP 150 OHM 1 16 W 1005 5 D R 3 R303 ERHY0000203 RESIS...

Page 59: ...470 47 ohm ohm 8 PIN J 1 32 W SMD R 3 R506 ERNR0000401 RES ARRAY R MNR04M0ABJ470 47 ohm ohm 8 PIN J 1 32 W SMD R 3 R508 ERHY0001102 RES CHIP 0 2 ohm 1 4W F 2012 R TP 3 R510 ERHY0000261 RESISTOR 10KOHM 1 16 W 1005 5 D R 3 R511 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 R512 ERHY0000213 RESISTOR 47 OHM 1 16 W 1005 5 D R T 3 R515 99999999999 NOT ASSEMBLE NOT ASSEMBLE 3 R516 99999999999 NOT ASSEMBLE NOT ...

Page 60: ... ohm 1 16W F 1608 R TP 3 R720 ERHY0006001 RES CHIP 3900000 ohm 1 16W F 1608 R TP 3 R723 ERHY0000244 RESISTOR SMD 1 5KOHM 1 16 W 1005 5 D R TP 3 R724 ERHY0000280 RESISTOR 100KOHM 1 16 W 1005 5 D R 3 R725 ERHY0000226 RESISTOR 220 OHM 1 16 W 1005 5 D R 3 R726 ERHY0000220 RESISTOR 100 OHM 1 16 W 1005 5 D R TP 3 R727 ERHY0000220 RESISTOR 100 OHM 1 16 W 1005 5 D R TP 3 R728 ERHY0000220 RESISTOR 100 OHM ...

Page 61: ...28DKB 1748 MHz PPM pF SMD 9 8 7 0 1 9 3 U507 EUSY0041001 IC X84256S8I 2 5 SOIC 8 PIN R TP UPORT SAVER EEPRO 3 U601 EUSY0077301 IC MAX4599 SC70 6 SOT23 6 6 PIN R TP 3 U602 EUSY0077301 IC MAX4599 SC70 6 SOT23 6 6 PIN R TP 3 U603 EUSY0077801 IC YMU757B QFN 20 PIN R TP 2 7 3 3V FM SYNTH 4 3 U604 EUSY0077401 IC MAX4624EUT T SOT23 6 6 PIN R TP 3 U605 EUSY0077601 IC SI9182DH 30 T1 MSOP 8 8 PIN R TP 3 U60...

Page 62: ...2 Specification Feature 61 ...

Page 63: ...P N AMBB0000201 April 2001 ...

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