LG -UD6100 Service Manual
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LG -UD6100 Service Manual

LG -UD6100 Service Manual

Single band cdma mobile phone
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Features of Mobile Subscriber Radio Handset
(LG-UD6100 Type)
1. Wave Type
• G7W
2. Frequency Scope
• Transmit Frequency : 824.820 ~ 848.190MHz
• Receive Frequency
3. Rated Output Power
• 0.251W(24dBm)
4. Output Conversion Method :
5. Voltage and Current Value of Termination Part Amplifier(Catalogue included)
Mode
CDMA
6. Functions of Major Semi-Conductors
Classification
QSC6010
MCP
(PF38F2040W0YBQE)
MCP
(PF38F2040W0YBQE)
7. Frequency Stability
• ±0.5PPM
LGE
LG Electronics Inc.
: 869.820 ~ 893.190MHz
This is possible by correcting the key board channel.
Type Name
Voltage
SKY77162
3.4V
MSM baseband, radioOne RF, and power management.
Flash Memory (64Mbit) ▶ Storing of the mobile station operation
program
PSRAM (32Mbit) ▶ Temporary storing of the data created while
busy
Current
Power
455mA
0.282W
Function

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Summary of Contents for LG LG-UD6100

  • Page 1 Features of Mobile Subscriber Radio Handset (LG-UD6100 Type) 1. Wave Type • G7W 2. Frequency Scope • Transmit Frequency : 824.820 ~ 848.190MHz • Receive Frequency : 869.820 ~ 893.190MHz 3. Rated Output Power • 0.251W(24dBm) 4. Output Conversion Method : This is possible by correcting the key board channel.
  • Page 2 CDMA MOBILE SUBSCRIBER UNIT LG-UD6100 SERVICE MANUAL SINGLE BAND CDMA MOBILE PHONE...

  • Page 3: Table Of Contents

    2.Features and Advantages of CDMA Mobile Phone……………………….5 Part List……….…………………….67 3.Structure and Functions of CDMA Mobile Phone……………………….8 4.Specification……………………….9 5.Installation…………………………12 Chapter 2. NAM Input Method……13 Chapter 3. Circuit Description……14 1.RF Transmit/Receive Part………14 2.Digital/Voice Processing Part….18 Chapter 4. Trouble Shooting…….22 LG Electronics Inc.

  • Page 4: General Introduction

    LG-UD6100 General Introduction The LG-UD6100 cellular phone functions as digital cellular phone worked in CDMA (Code Division Multiple Access) mode. CDMA mode applies the DSSS (Direct Sequence Spread Spectrum) technique that has been used in military. This technique enables to share one frequency channel with many users in the same specific area.

  • Page 5: Chapter 1. System Introduction

    Another method available is to make two persons to sing in different languages at the same time, space, and frequency when wishing to let the audience hear the singing without being confused. This is the characteristics of CDMA. LG Electronics Inc.
  • Page 6 At this time, the spectrums of other signals that have different codes are not recovered into its original state and instead, processed as noise and appears as the self-interference of the system. LG Electronics Inc. 4/21...

  • Page 7: Features And Advantages Of Cdma Mobile Phone

    The backward open loop power control is carried out in a corresponding mobile station; the mobile station measures power received from the cell site and then, reversely increases/decreases transmit power in order to compensate channel changes caused by the forward link path loss and terrain LG Electronics Inc. 5/21...
  • Page 8 During the soft hand, the cell site already in the busy state and the cell site to be engaged in the call later participate in the call conversion. The call conversion is carried out through the original call LG Electronics Inc. 6/21...
  • Page 9 In addition, in the CDMA system, services and service charges are classified further into different classes so that more transmit power can be allocated to high class service users for easier call set-up; they can also be given higher priority of using hand-off function than the general users. LG Electronics Inc. 7/21...

  • Page 10: Structure And Functions Of Cdma Mobile Phone

    (AGC Amp). Then, they are converted into RF band by the frequency synthesizer synchronizing these signals to proper output frequencies. Transmit signals obtained pass through the duplexer filter and then, are sent out to the cell site via the antenna. LG Electronics Inc. 8/21...

  • Page 11: Specification

    Talk Time 145 Min (Cell power -92dBm) 4.2 Receive Specification 4.2.1 Frequency Range : 869.820 MHz ~ 893.190 MHz 4.2.2 Local Oscillating Frequency Range : 1738.08MHz ~ 1787.94MHz 4.2.3 Intermediate Frequency : QSC60X0 seires (Zero IF) LG Electronics Inc. 9/21...
  • Page 12 4.3.5 CDMA TX Frequency Deviation : 4.3.6 CDMA TX Conducted Spurious Emissions • 900kHz : - 42 dBc/30kHz below • 1.98MHz : - 54 dBc/30kHz below 4.3.7 CDMA Minimum TX Power Control : - 50dBm below LG Electronics Inc. 10/21...
  • Page 13 885.810 MHz 873.330 MHz 874.560 MHz 887.04 MHz 875.790 MHz 888.270 MHz 877.020 MHz 889.500 MHz 890.910 MHz 878.250 MHz 879.480 MHz 892.140 MHz 880.890 MHz 893.370 MHz 4.6 Charge time 4.6.1 Standard Battery : 200 Min. LG Electronics Inc. 11/21...

  • Page 14: Installation

    Connect the kit’s power cable connector to the interface box power receptacle. 5.3.2.2 Antenna Cable Connection Connect the antenna coupler cable connector from the cradle to the external antenna connector. ( Antenna is not included.) LG Electronics Inc. 12/21...

  • Page 15: Chapter 2. Nam Input Method

    LG-UD6100 CHAPTER 2. NAM Input Method (Inputting of MIN included) 1. HOW TO POWER UP 1. Press power key. 2. You have to input correct PIN code[Default Code: 0000], then press [OK] key. 3. Handset start data loading process, and then searching signal.

  • Page 16: Chapter 3. Circuit Description

    After that, the RF signal is amplified by the Power Amp 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 duplexer LG Electronics Inc. 14/21...
  • Page 17 Insertion loss (IL) in the transmit band is 2.8dB (Max), whereas IL in the receive band is 3.5dB (Max). The receive band attenuation amount of transmit filter is 45dB (Min) and the transmit band attenuation amount of receive filter is 57dB or more (Min). LG Electronics Inc. 15/21...
  • Page 18 I and I/ are 180 deg. The mixer in QSC6010 converts baseband signals into RF signals. After passing through the upconverters, RF signal is inputted into the Power Amplifier Module. The QSC6010 Cellular CDMA RF specifications are described below: LG Electronics Inc. 16/21...
  • Page 19 1.4 Description of Frequency Synthesizer Circuit 1.4.1 Crystal Oscillator (X201) Crystal Unit generates the refrence frequency of 19.2MHz. Tolerance at 25 ° C is ±12x10 Max. at -30 to 85 ° C Max.Tolerance over the tmperature range is ±12x10 LG Electronics Inc. 17/21...

  • Page 20: Digital/Voice Processing Part

    Viterbi decoder, Mod/Demod, codec, and vocoder.with RF, and PA module 2.2.4 Memory Part The memory part is made up of a flash memory, SRAM for storing data. 2.2.5 Camera Part This is used to process image signals LG Electronics Inc. 18/21...
  • Page 21 The CDMA air interfaces mentioned earlier are implemented on the baseband CDMA processor. All necessary interfaces to the RF functions are provided, some using a portion of the 57 GPIOs. Many of the AMSS-configurable GPIOs are available for alternate uses LG Electronics Inc. 19/21...
  • Page 22 QSC6010(U201) is activated by the PWR_ON_SW/ signal, and then the LDO regulators embedded in QSC6010 are operated and +2.80V_MSMC, +2.85V_MSMP and +2.6V_MSMA are generated. 2.3.5 Camera Part The Camera Backend IC(U503) is activated by QSC6010 when QSC6010 catch the event signal of camera signal. LG Electronics Inc. 20/21...
  • Page 23 LCD module contains a controller which will display the information onto the LCD by 16-bit data from the QSC6010. It is also supplied stable 1.8V_MSM_E1 by inner regulator in U201 for fine view angle and and LCD reflects to improve the display efficiency. LG Electronics Inc. 21/21...

  • Page 24: Chapter 4. Trouble Shooting

    CHAPTER 4. Trouble Shooting CHAPTER 4. Trouble Shooting 4.1 Rx Part Trouble When Rx Sensitivity isn’t good enough Test Point Duplexer QSC6010...
  • Page 25 Circuit Diagram...
  • Page 26 Checking Flow START Rx TEST SETUP(HHP) - Test Channel : 610 E5515C Setup - CH : 610 1. Check Change RF cable or re-set loss RF cable & Loss 2. Check RF path Re-work or replace them Circuit connection 3. Check Replace them U101, DP101, F102 Download S/W &...
  • Page 27 4.2 Tx Trouble Test Point Mobile filter QSC6010 Duplexer Checking Flow START √ Connect the phone to u-USB connector √ Press H/W or F7, then click ‘offline-d’ -Click ‘Band select‘ to cdma & Tx on &Power Amp -Set channel to 610 & AGC :400 √...
  • Page 28 4.2.1 Check PAM Circuit Test Point U103 Pin7 (RF_OUT) U103 Pin 1,8 (Vcc1,2) U103 Pin4 (Vref +2.85V) U103 Pin2 (RF_IN) Circuit Diagram...
  • Page 29 Circuit Flow Check U103 Pin2 Check F101 circuit Input Level is Appear? RF_IN Check U103 Pin4 Is Vref 2.85V ? Check Q101 circuit V_ref Check U103 Pin1,8 Level is Check C206, U201 VCC1,2 3.2V~4.2V OK? Check U103 Pin7 Output Level Replace U103 RF_OUT is Appear?
  • Page 30 4.2.2 Check Duplexer & Mobile SW TEST POINT Mobile S/W U101 PIN1 Mobile S/W in DP101 PIN6 DP_out Duplexer DP101 Circuit Diagram Circuit Flow Check DP101 Pin6 Replace DP101 Level is Appear? DUP_OUT Check U101 Pin1 Level is Appear? Replace U101 Replace QSC6010...
  • Page 31 4.3 Logic Part Trouble 4.3.1 Power On Trouble Circuit Diagram Figure 4.3.1 QSC6010 circuit diagram Test Points C133(+3.0V_FM) R207(+2.8V_TCXO) C209(+2.6V_TX) C213(+2.8V_BACK_END) C216(+2.6V_MSMP) C212(+1.8V_MSM_E1) C207(+2.6V_RX) QSC6010 R203(+1.2V_MSMC) C218(+2.65V_MSMA) C219(+2.85V_RUIM) R411(PWR_ON_SW)
  • Page 32 Checking Flow START Check Battery Voltage Charge of Change Battery and try again > 3.2V ? Push power-on key and check Check the contact of power-key the level change of or dome switch R404 Check the voltage of the following port at U201 +1.2V_MSMC Replace U201 +2.6V_MSMP...
  • Page 33 4.3.2 Charging Trouble Test Points QSC6010 Q201 CON401 CON502 Figure 4.3.2 Charging PART Circuit Diagram...
  • Page 34 Checking Flow SETTING : Connect the battery and the charging adaptor (TA) to the phone START Charging Connector Re-solder or replace CON502 CON502 Well-soldered? Voltage at The charging adaptor (TA) is out of order. Pin1(V_CHAR) Change the charging adaptor. of CON502 = 5V? Check and replace Check CON401 = 4.2V ? QSC6010 or Q201...
  • Page 35 4.3.3 Key Backlight LED Trouble Test Points LED312 LED313 LED317 LED318 LED316 LED315 Figure 4.3.3 KEYPAD BACK LIGHT PART Circuit Diagram Figure 4.3.8 KEYPAD Back Light Circuit...
  • Page 36 Checking Flow START Charge or Change Battery and try again Turn on the phone Is the voltage level +VPWR Check the soldering of each R or (R301,R328,R307,R309,R310,R314,R325,R377~R386) Replace them. 3.2-4.2V? Check LEDs’ directions Re-solder or replace LEDs Check the signal level at Replace QSC KYPD_EN=high? BACKLIGHT WILL...
  • Page 37 4.3.4 LCD Trouble Test Points Pin34 Pin35 Pin6 U307 Pin1 Pin1 Pin2 Circuit Diagram...
  • Page 38 Checking Flow : LCD START Re-connect LCD fpcb Check LCD fpcb connection Check CON403 Check & replace QSC6010 circuit Pin3 (MSMP)= 2.6V ? Pin33 (MSM_E1) = 1.8V ? Check the Re-Soldering CON403 CON403 Soldering Check the Control signal Does F401,F402,U477 Re-soldering or Replace D[0:15], LCD_RESET/, (LCD connection)
  • Page 39 Checking Flow : Back Light START Check the U307 pin 5 Check & replace QSC +VPWR Re-Soldering or Does U307 work Properly? Replace U307 Check the signal level at Replace QSC LCD_BACK_EN=high? LCD backlight will work properly...
  • Page 40 4.3.5 UIM Trouble Test Points CON301 Circuit Diagram +3.0V...
  • Page 41 Checking Flow KCN-2T-0-0075 - CON301 : - U201 : QSC6010 START Re-soldering CON301 Check CON301 soldering? Check UIM Card circuit Re-solder or replace them (R368,R369,R378) Check QSC6010 Circuit...
  • Page 42 4.3.6 FM Radio Trouble Test Points Pin1 Pin1 X101 Pin8 U104 R366 U102 Pin4 R367 Circuit Diagram FM AMP Frequency Generator Circuit FM Receiver Circuit Circuit...
  • Page 43 Checking Flow SETTING : Attach the headset and “Listen to Radio” at Radio menu Start Check the Freq. at X101 is working? pin4 of U102. Check the pin1 of Replace X101 Freq.= 32.768kHz? X101. (Shown Graph 1) Freq.= 32.768kHz? Check the condition of U102 and external component.
  • Page 44 4.3.7 Audio AMP Trouble Test Points Pin4 COM_SPK- Pin4 COM_SPK+ U305 U306 Pin1 Pin1 QSC_AMP_OUT- QSC_AMP_OUT+ Figure 4.3.7 RECEIVER PART Circuit Diagram...
  • Page 45 Checking Flow SETTING : “Ringers” at Sounds menu START Check the contact of speaker or Does Speaker work Properly? Replace the speaker Replace QSC6010 or board Signal from U305,U306 pin1 Check the signal Re-soldering or level at pin4 of Replace the U305, U306 U305,U306 Speaker will work properly...
  • Page 46 4.3.8 MIC Trouble Test points R371 C327 M301(MIC) Circuit Diagram...
  • Page 47 Checking Flow SETTING : After initialize 5515C, Test US Cellular START Voltage at R371 = 1.2V? Check the soldering Re-solder R371 (MIC BIAS Voltage Check) Of R371 Replace U201(QSC6010) Check the signal level Replace the microphone at + pin of MIC. Is It a few tens mVAC? Check the soldering of Re-solder C327...
  • Page 48 4.3.9 Vibrator Trouble Test points Circuit Diagram D301, C309 Figure 4.3.9 Vibrator PART Figure 4.3.9 VIBRATION CONTROL BLOCK Checking Flow SETTING : “Vibrator on” at Sounds of test menu START Check the state of Re-contact vibrator Contact of Vibrator Replace Vibrator Does Vibrator work Properly? Check the solder of Re-solder or replace them...
  • Page 49 4.3.10 Earphone Trouble Test Points U303 U304 R413 CON402 Circuit Diagram...
  • Page 50 Checking Flow SETTING : After initialize 5515C, Test US Cellular START Insert the earphone to the handset. Earphone detect problem Does the audio Profile of the phone change to the earphone mode? Audio path problem Set the audio part of the test equipment to echo mode Set the audio part of the test equipment to...
  • Page 51 Earphone detect problem Change the earphone and then insert to the handset Does the audio Level of pin 5 of CON402 Profile of the phone change to is less than 1.4V? the earphone mode? Re-download software Does it work well? Replace QSC Check soldering Re-solder or replace CON402...
  • Page 52 Earphone sending path problem Re-download Level of pin4 at CON402 Re-solder Does it work well? software is more than 2.0V R412, R415 Does it work well? Level of C266 is Re-solder About a few tens C266 or hundreds mVAC? Replace QSC Earphone receiving path problem Signwave appear Change main board...
  • Page 53 4.3.11 Camera Trouble Test Points CON501 U503 R501 Pin2 U502 U501 CON406 Pin1 Pin35 Circuit Diagram 1.5V 2.8V U502 U501 CLOCK QSC6010 CAM Controller 19.2MHz Camera U201 GPIO[30] U503 R501 CON501 CON403...
  • Page 54 4.3.13 Camera Trouble Start Check camera Locking error Next page Check camera ! Remove it and is it combined recombine correctly? Check Check Replace Back_end_clk connection U201 [19.2MHz, R501 2.6V] Check Check Replace connection M_clock U503 R514 [12.8MHz] Check Check Power connection 2.8V &...
  • Page 55 Camera Locking Error BACK_END_CLOCK M_CLOCK P_CLOCK VS DATA[0]...
  • Page 56 RF500(U101) UD6100 Block Diagram Mobile S/W IL : 0.4~0.5dB SKY77162(U103) B9426(F101) IL=1.5~2.3 dB Quadrature Upconverter V ref=2.85V RF Block Quadrature Downconverter B7638(DP101) TX IL 1.5 ~ 2.1 dB B9432 RX IL 2.2 ~ 2.6 dB (F102) IL = 1.8~2.5 dB QSC6010 Camera Camera...
  • Page 57 LG-RD6100 MAIN Doc. Name Doc. Number SHEET : 1 OF 5 DRAW : DATE 2007.12.07 CHKD APRD <RF Tx PATH> Q101 KRX102U +VPWR +2.85V_TCXO <ANT> C113 ISSUE : 100n C106 C105 ANT102 ANT101 PA_ON 1608 10u-10V 2.2u C130 CONTENT : R107 Rev1.0...

  • Page 58: Block Diagram

    LG-RD6100 MAIN Doc.Name Doc.Number SHEET QSC6030_MEMORY DRAW QSC6030_MEMORY DATE 2007.12.07 CHKD APRD TX_CP RX_CP ISSUE PA_ON PA_ON UART1_RFR_N/GPIO(56) UART_TP_SEN PA_R0 PA_R0 UART1_CTS_N/GPIO(55) CELL_OUTM CELL_OUTM GPIO(54) +3.0V_FM_EN CONTENT Rev1.0 CAM_DATA_7/GPIO(53) FM_AMP_EN CELL_OUTP CELL_OUTP TX_CP TX_CP CAM_DATA_6/GPIO(52) FM_RESET/ +/-1% RBIAS_TX CAM_DATA_5/GPIO(51) FM_GPIO2 R217 11.8k...

  • Page 59: Circuit Diagram

    LG-RD6100 MAIN Doc. Name Doc. Number SHEET : 3 OF 5 DRAW : G.S.KANG < AUDIO PART > <MEMORY> DATE 2007.12.07 +VPWR CHKD +1.8V_MSM_E1 C.M.PARK APRD +1.8V_MSM_E1 U305 NLAS4157DFT2G COM_SPK+ QSC_AMP_OUT+ RCV/SPK_MODE L301 R367 EAR10P COM_SPK+ R327 A[1] R348 ISSUE :...
  • Page 60 LG-RD6100 MAIN Doc. Name Doc. Number SHEET : 4 OF 5 DRAW : G.S.KANG <Battery CONNECTOR> DATE 2007.11.09 <MAIN KEY> CHKD C.M.PARK R416 CON401 220k HSBC-3P-58 SW409 APRD +2.6V_MSMP SW401 SW411 SW416 BATT_DET_ADC R401 SEARCH +VPWR KYPD[9] SW402 SW406 SW412...
  • Page 61 LG-RD6100 MAIN Doc. Name Doc. Number SHEET : 5 OF 5 DRAW : G.S.KANG R532 micro-USB RECEPTACLE +2.6V_MSMP DATE 2007.11.09 Q530 DC_PWR_SEN/ KRC404E CHKD C.M.PARK APRD USB_POWER PGPIO0 TP502 D502 PGPIO1 UDZS_TE-17_5_6B_DNI +1.8V_MSM_E1 VDD_CORE PGPIO2 CAM_PWR_EN R512 PGPIO3 LCD_ID PGPIO4...
  • Page 62 0 Ohm Pad 0 Ohm Pad DNI...
  • Page 63 0 Ohm Pad 0 Ohm Pad DNI...
  • Page 67 [ACCESSORIES] NO Ref No Part Name Part Number Rev QTY Unit Spec Main Maker Code Maker P/N 1 MCJA00 COVER,BATTERY MCJA0053401 EACH MOLD, PC LUPOY MCJA0053401 2 MHBY HANDSTRAP MHBY0000407 EACH Handstrap(Silver) 3 MMBB00 MANUAL,OPERATION MMBB0273701 EACH PRINTING, (empty) MMBB0273701 4 SBPL00 BATTERY PACK,LI-ION SBPL0091401...
  • Page 68 [ 2. PCB ] NO Level Ref No Part Name Part Number Rev QTY Spec Main Maker Main Maker Code Maker P/N SPFY00 PCB,MAIN SPFY0168001 FR-4 ,0.8 mm,BUUNITECH PRINTED CIRCUIT BOARD CORP. TW000442 SPFY0168001...

  • Page 69: Part List

    [ 3. Mechanical Part ] NO Level Ref No Part Name Part Number Rev QTY Spec Main Maker Code Maker P/N ACGK00 COVER ASSY,FRONT ACGK0099701 ACGK0099701 MCCZ00 MCCZ0026701 MOLD, Urethane Rub MCCZ0026701 MCJK00 COVER,FRONT MCJK0079801 MOLD, PC LUPOY SC MCJK0079801 MICZ00 INSERT MICZ0027001...
  • Page 70 [RD6100 PCB Bottom Part List] Level Ref No Part Name Part Number Rev QTY Unit Spec Main Maker Code Maker P/N SAFC00 PCB ASSY,MAIN,SMT BOTTOM SAFC0103401 EACH C101 CAP,CHIP,MAKER ECZH0000839 EACH 4.7 pF,50V ,C ,NP0 ,TC KR008628 C1005C0G1H4R7CT C102 CAP,CHIP,MAKER ECZH0000813 EACH 100 pF,50V ,J ,NP0 ,T KR008628...
  • Page 71 100 5 C302 CAP,CHIP,MAKER ECZH0003103 EACH 0.1 uF,10V ,K ,X7R ,H JP000222 GRM36X7R104K10PT 101 5 C303 CAP,CERAMIC,CHIP ECCH0005603 EACH 2.2 uF,10V ,K ,X5R ,TC JP000222 GRM39X5R225K10 102 5 C304 CAP,CERAMIC,CHIP ECCH0005603 EACH 2.2 uF,10V ,K ,X5R ,TC JP000222 GRM39X5R225K10 103 5 C306 CAP,CHIP,MAKER ECZH0003103...
  • Page 72 203 5 Q101 TR,BJT,ARRAY EQBA0000601 EACH UMT5 ,.2 W,R/TP , KR008372 KRX102U 204 5 Q201 TR,BJT,PNP EQBP0008701 EACH SC-62 ,0.6 W,R/TP ,PN US000807 2SB1424 205 5 Q401 TR,BJT,PNP EQBP0006701 EACH ESM ,100 mW,R/TP ,PKR008372 KRA304E 206 5 R107 CAP,CHIP,MAKER ECZH0000813 EACH 100 pF,50V ,J ,NP0 ,T KR008628 C1005C0G1H101JT...
  • Page 73 Level Ref No Part Name Part Number Rev QTY Unit Spec Main Maker Code Maker P/N SAFD00 PCB ASSY,MAIN,SMT TOP SAFD0102001 EACH C103 CAP,CERAMIC,CHIP ECCH0000115 EACH 22 pF,50V,J,NP0,TC,1KR008627 MCH155A220JK C104 CAP,CERAMIC,CHIP ECCH0000115 EACH 22 pF,50V,J,NP0,TC,1KR008627 MCH155A220JK C112 CAP,CHIP,MAKER ECZH0000813 EACH 100 pF,50V ,J ,NP0 ,T KR008628 C1005C0G1H101JT C116...

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