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LG GB108 Service Manual

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GB108
Service
Manual
LG Electronics
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Summary of Contents for LG GB108

  • Page 1 GB108 Service Manual LG Electronics...

  • Page 2: Table Of Contents

    Table Of Contents 1. INTRODUCTION………………..3 4.10 LCD Trouble…………………………..67 1.1 Purpose………………………………..3 4.11 Microphone Trouble…………………...69 1.2 Regulatory Information……………….3 4.12 Receiver Trouble……………………….71 2. PERFORMANCE………………...5 4.13 Speaker Trouble………………………..73 2.1 H/W Features………………………….5 4.14 Headphone Trouble…………………….75 2.2 S/W Features…………………………..6 4.15 Charging Trouble……………………….79 3. TECHNICAL BRIEF……………11 4.16 FM Radio Trouble……………………...81 5.

  • Page 3: Introduction

    1. INTRODUCTION Purpose This manual provides information necessary to repair, description and download the features of this model. 1.2 Regulatory Information A. Security Toll fraud, the unauthorized use of telecommunications system by an unauthorized part(for example , persons other than your company’s employees, agents, subcontractors, or person working on your company’s behalf) can result in substantial additional charges for your telecommunications services.
  • Page 4 E. Notice of Radiated Emissions This model complies with rules regarding radiation and radio frequency emission as defined by local regulatory agencies. In accordance with these agencies, you may be required to provide information such as the following to the end user. F.

  • Page 5: Performance

    2. PERFORMANCE H/W Features Item Specifications Solution EGOLD voice PMB7880 (ULC2) Infineon Bar type Antenna Type Internal (dual-Band) Main Display 1.5＂ 128x128 CSTN/65k Battery 800mAh Li-ion inner pack 800mAh: 54x34x4.9mm Audio player MIDI ring tone, 16poly MIDI ring tone Loud Speaker Memory Size 32Mb+4Mb No user memory...

  • Page 6: S/W Features

    Audio Speech Code FR,EFR,HR,AMR-NB AMR code GSM Full Rate 3GPP Adaptive Multi Rate (AMR-NB) FM Radio Only GB105,GB105a,GB105b,Gb107,GB107a,GB107b,GB108 MP3 Ring Tone MP3 decode Integrated hands free Speaker phone mode speaker Key Tone Volume 6 Level (Include Mute) Ring Tone Volume...
  • Page 7 Dual Clock Home shortcut Display Shortcut icon in Idle Call History Last Dial Number Max : 20 records Last Received Number Max : 20 records Last Missed Number Max : 20 records Scratch Pad Memory Call Duration Last Call time, Total Call Time Call Cost Last Call Charge Units Total Charge Units...
  • Page 8 Email Entry Picture ID Video Caller ID vCard Business Card Delete Delete, Delete All(SIM or Phone), Multi Delete Supplementary Services Call Forwarding Unconditional Call Forwarding on Mobile Subscriber Busy CFNRy Call Forwarding on No Reply CFNRc Call Forwarding on Mobile Subscriber Not Reachable BAOC Barring of All Outgoing Calls BOIC...
  • Page 9 Settable Voice Mail Center Number Message Protocol Normal, Fax, National Paging, X400, ERMES, Voice Message Overflow Indicator Message Center Number Not supported. Nokia Smart Message [Can be supported based on operator request] Miscellaneous Development & Test Function Facility Field Test Facility Display Software Version IMEI Restore Factory Setting...
  • Page 10 Real Time Clock 12/24 Hour Calendar Time Zone Daylight saving Alarm Manager Dimming Clock Power-off Alarm On Alarm Event Others Mobile Tracking For India, Asia software M-DOG For China Accessory Micro SD Adapter Stereo Ear-mic without Ear-mic type Stereo without hook key. hook switch Only FM play supports Stereo.

  • Page 11: Technical Brief

    3. TECHNICAL BRIEF Digital Main Processor Figure.3-1 PMB7880 FUNCTIONAL BLOCK DIAGRAM...
  • Page 13 3.1.2 Features Baseband • High performance fixed-point TEAKlite DSP • C166S high performance microcontroller • There are several Interfaces: – I2S interface for DAI connections (for Tape Approval) – High Speed SSC Interface for connection of external peripherals – SIM Interface –...
  • Page 14 • 4 measurement interfaces (PA temperature, battery voltage, battery temperature, and ambient temperature) • Differential microphone input • System start up circuitry • Charger circuitry for NiCd, NiMh and LiIon cells • Integrated regulators for direct connection to battery.
  • Page 15 3.1.3 GSM System Description The E-GOLDvoice is suited for mobile stations operating in the GSM850/900/1800/1900 bands. In the receiver path the antenna input signal is converted to the baseband, filtered, and then amplified to target level by the RF transceiver chip set. Two A-to-D converters generate two 6.5 Mbit/s data streams.
  • Page 16 3.1.6 C166S Buses The C166S is connected to three buses: 1. Local Memory (LM) bus 2. X-Bus 3. PD-Bus. 3.1.7 TEAKLite Bus The TEAKlite is connected to the TEAKlite bus. 3.1.8 Bus Interconnections The interconnection between the X-Bus and the TEAKlite Bus uses: •...
  • Page 17 3.1.15 On-Chip Security Concept Secure boot is based on a public/private key approach. Flash images that are not signed with the private key during phone manufacture cannot be loaded. Verification of the Flash code is done with the public key. The public key as well as hash and verify algorithms are stored in the ROM, which ensures a hardware secured boot procedure.

  • Page 18: Power Amplifier Module(Sky)

    Power Amplifier Module(SKY77517/ SKY77518) 3.2.1 GB100/GB100b/GB102/GB105/GB105b/GB108 (SKY77518) Figure.3-2-1 SKY77518 FUNCTIONAL BLOCK DIAGRAM The SKY77518-21 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier Control (iPAC™) for dual-band cellular handsets comprising GSM900 and DCS1800 operation. Designed in a low profile, compact form factor, the SKY77518-21 offers a complete Transmit VCO-to- Antenna and Antenna-to-Receive SAW filter solution.
  • Page 19 band select pad (BS) selects between GSM and DCS modes of operation. The transmit enable (TX_EN) pad controls receive or transmit mode of the respective RF switch (TX = logic 1). Proper timing between transmit enable (TX_EN) and Analog Power Control (VRAMP) allows for high isolation between the antenna and TXVCO while the VCO is being tuned prior to the transmit burst.
  • Page 20 Arsenide (GaAs) die. One PA block supports the GSM850 band and the other PA block supports the PCS1900 band. Both PA blocks share common power supply pads to distribute current. The output of each PA block and the outputs to the two receive pads are connected to the antenna pad through PHEMT RF switches and a diplexer.

  • Page 21: 26Mhz Clock (Dcxo)

    26MHz Clock (DCXO) Figure.3-3 Crystal Oscillator Functional Overview The XO_TUNE register holds the digital correction value for the crystal oscillator frequency. The XOMODE bits of XO_INIT1 register contain setup informations for the crystal oscillator (for example, current programming, etc.).See Figure .3-3 Crystal Oscillator Functional Overview. The registers XO_INIT2 and XO_INIT3 contain the coefficients information for the linearization unit of crystal oscillator (LUXO) This linearization unit computes the required digital control word out of the programmed AFC bits in order to have a linear pulling curve ppm vs.

  • Page 22: Rtc(32.768Khz Crystal)

    RTC(32.768KHz Crystal) Figure.3-4 E-GoldVoice RTC Interface...

  • Page 23: Lcd Interface

    3.5 LCD Interface(3 wire SPI interface) Figure.3-5-1 LCD Interface Figure.3-5-2 Charging PUMP Interface...

  • Page 25: Sim Card Interface

    3.6 SIM Card Interface Figure.3-6 SIM CARD Interface...

  • Page 26: Keypad Interface

    3.7 KEYPAD Interface Figure.3-7 KEY MAXTRIX Interface...

  • Page 27: Battery Charging Block Interface

    3.8 Battery Charging Block Interface Figure.3-8 Charging IC Interface...

  • Page 28: Rf Interface

    3.9 RF Interface Figure.3-9 RF Module/SAW Filter Interface...

  • Page 30: Audio Interface

    3.10 Audio Interface Figure.3-10-1 Audio Interface...
  • Page 32 Figure.3-10-2 Main Speaker(Receiver) Interface...
  • Page 33 Figure.3-10-3 Main Microphone Interface Figure.3-10-4 Headset Interface...

  • Page 34: Key Led Interface

    3.11 Key LED Interface Figure.3-11 Key LED Interface This handset has 8 LEDs that illuminates blue color. Control signal is controlled by E-GoldVoice with PWM and handset has 3 methods, ON, OFF, Dimming.

  • Page 35: Vibrator Interface

    3.12 Vibrator Interface Figure.3-12 Vibrator Interface This handset has Vibrator operation. Control signal is controlled by E-GoldVoice with PWM.

  • Page 36: Memory Interface

    3.13 Memory Interface Figure.3-13 Memory Interface...

  • Page 37: Power Block Interface

    3.14 Power Block Interface Figure.3-14-1 Power Block Interface The E-GOLDvoice integrated power management unit (PMU) supports direct connection to battery (DCB), see Figure 3-1 E-GOLDvoice Block Diagram. That means all supply voltages needed are generated on-chip with integrated linear voltage regulators. The input of these linear voltage regulators is the battery voltage.
  • Page 38 The integrated power management also provides the control state machine for system start up, including start up with discharged batteries, pre-charging and system reset control. After system start up several methods are implemented for active and idle power saving. LDO output voltage selection •...

  • Page 39: Fm Radio Interface

    3.15 FM Radio Interface (GB105a/b&GB106&GB107a/b&GB108 only) Figure.3-15 FM Radio Interface...
  • Page 40 3.15.1 FM Tuner (GB105a/b&GB106&GB107a/b&GB108 only) The Si4702 patented digital low-IF architecture reduces external components and eliminates the need for factory adjustments. The receive (RX) section integrates a low noise amplifier (LNA) supporting the worldwide FM broadcast band (76 to 108 MHz). Anautomatic gain control (AGC) circuit controls the gain of the LNA to optimize sensitivity and rejection of strong interferers.
  • Page 42 Antenna Matching component Antenna connect point Mobile SW PAM Matching component...

  • Page 51: Power On Trouble

    4 .3 Power On Trouble Test Point Check Points : - Battery Voltage(Need to over 3.35V) - Power-On key detection(PWRON signal) - Outputs of LDOs U101(EGV) Voltage PART VBUF 2.8V VMEM 2.8V 2.8V VSIM 2.85V VRF0 1.5V VANA 2.5V...
  • Page 52 Circuit Diagram...
  • Page 53 Checking Flow Start Check Battery Voltage > Charge or Change Battery 3.35V ? Push Power_ON key and Charge or Change Battery check the level change of PWRON key Check the Voltage of Replace U101 LDOs Output @U101 LDO Voltage The Phone will Power VBUF = 2.8V VMEM = 2.8V VIO = 2.8V...

  • Page 54: Sim Card Trouble

    4.4 SIM Card Trouble Test Point Circuit Diagram...
  • Page 55 Checking Flow Start Change the SIM Card . Our Does the SIM Card phone supports only 2V or 3V supports 2V or 3V ? SIM Card Check solding status of J201 Resolder J201 or other component and other component (R201/C203/C204/C205) Change Board Check TP1 = 2.85V ? Re-download the SW...

  • Page 56: Vibrator Trouble

    4.5 Vibrator Trouble Test Point Circuit Diagram...
  • Page 57 Checking Flow Start Enter the Engineer Mode and set Vibrator ON Check Voltage Level of Change Board TP1 ? TP1 = 2.8V ? Check Voltage level of Change U506 TP2 = 0V ? Replace Vibrator...

  • Page 58: Keypad Trouble

    4.6 Keypad Trouble Test Point Circuit Diagram...
  • Page 59 Checking Flow Start Check Metal Change Metal Dome Dome ? Change PCB...

  • Page 60: Rtc Trouble

    4.7 RTC Trouble Test Point Circuit Diagram...
  • Page 61 Checking Flow Start Is the Frequency about Replace X102 and try again 32kHz ? Check soldering status Replace C122,C123 of C122,C123 Check Voltage Level of Replace C101 TP1 = 2V ? RTC will work properly...

  • Page 62: Key Backlight Trouble

    4.8 Key Backlight Trouble Test Point...
  • Page 63 Circuit Diagram...
  • Page 64 Checking Flow Start Check Voltage Level of Replace U505 or Change PCB TP1 = 2.8V ? Replace Component Check LED Component (D501,D502,D503,D504,D505,R5 (D501,D502,D503,D504,D505,R 01,R507,R506,R508,R510,R513) 501,R507,R506,R508,R510,R51 Change PCB...

  • Page 65: Lcm Backlight Trouble

    4.9 LCM Backlight Trouble Test Point Circuit Diagram...
  • Page 66 Checking Flow Start Check Voltage Level of TP1 & Replace R408 or Change PCB TP2 as 2.8V step waveform ? Check Voltage Level of Replace U401 TP3 as 4.9V step waveform ? Change PCB...

  • Page 67: Lcd Trouble

    4.10 LCM Trouble Test Point Circuit Diagram...
  • Page 68 Checking Flow Start Backlight is OK ? Change PCB Check Control Signal and Replace Component or power including soldering status , as the waveform ? Replace J401 Check soldering status of J401 Change PCB...

  • Page 69: Microphone Trouble

    4.11 Microphone Trouble Test Point Circuit Diagram...
  • Page 70 Checking Flow Start Make a Call Check Voltage Level of Replace U101(EGV) TP1 VMIC = 2.5V ? Re-solder or Replace Check Component Component status around Mic Re-solder or replace Check status of MIC Microphone Replace U101(EGV) or Change PCB...

  • Page 71: Receiver Trouble

    4.12 Receiver Trouble Test Point Circuit Diagram...
  • Page 72 Checking Flow Start Make a Call Check Component status Re-solder or Replace (L301,L302,R303,R309) Component L301 & L302 bias will fluctuate above 1.2V Resolder or Replace the Check TP1 & TP2 Component Check the Contact of Re-solder or replace Receiver Receiver Replace U101(EGV) or Change PCB...

  • Page 73: Speaker Trouble

    4.13 Speaker Trouble Test Point Circuit Diagram...
  • Page 74 Checking Flow Start Turn On the sound Check the voltage level Check the Battery of TP1 = VBAT ? Check the signal of Check U101(EGV) TP2 & TP3 Check U101(EGV) Check the Level of TP4 = High ? Re-solder L301,L302 Check the signal of TP5 &...

  • Page 75: Headphone Trouble

    4.14 Headphone Trouble Test Point...
  • Page 76 Circuit Diagram...
  • Page 77 Checking Flow Start Does the audio profile of the phone change to the earphone mode ? Earphone Check voltage level of Check U101(EGV) TP6 VMIC = 2.5V? Check component Re-solder or replace the status around VMIC component Check the signal level and Re-solder causal HS_MIC .
  • Page 78 Earphone Acoustic Does waveform at Replace U101(EGV) or TP3(U101.HS_REC) Change the PCB . fluctuate ? Does waveform at Check U305 and component TP4 & TP5(U305.3 status around U305 &.9) fluctuate ? Does waveform at TP1 Re-solder causal component(J501 , & TP2(J501.4 & .5) C322 etc) fluctuate ? Change another Ear-Mic set...

  • Page 79: Charging Trouble

    4.15 Charging Trouble Test Point Circuit Diagram...
  • Page 80 Checking Flow Start Re-solder the J501 I/O Connector(J501) is pin12,13 : VCHARGE well-soldered ? The TA is out of order . Is the Voltage of TP1 & TP2 Change the TA between 4.8V & 6.4V? The voltage of TP3 & Replace the U503 TP4 is over 2.5V ? Check the voltage of TP5...

  • Page 81: Fm Radio Trouble

    4.16 FM Radio Trouble (GB105a/b&GB106&GB107a/b only) Test Point...
  • Page 82 Circuit Diagram...
  • Page 83 Checking Flow Start INT FM INT-FM or EXT-FM ANT Check a condition of Ear Jack connector soldering(J501) for Ext-FM-ANT Replace the J501 A condition is Good ? Check a condition of FM tuner Matching component (TP5,6,7) Give the additory solder in A condition is Good ? TP5,6,7 FM_Radio working is...
  • Page 84 Check a condition of CLK(TP8 = 32KHz) Replace PCB A condition is Good ? Check a condition of U303 soldering Replace U303 A condition is Good ? Check a condition of TP10 , U304 Soldering Give the additory in TP10 , A condition is Good ? U304 Check a condition of FM_Radio...
  • Page 85 INT FM Check a condition of Pogo PIN for Z301 Int-FM-ANT(TP11) Replace the Z301 A condition is Good ? Check a condition of FM tuner Matching component (TP12,13,7) Give the additory solder in A condition is Good ? TP12,13,7 FM_Radio working is good ? Finish...

  • Page 86: Download

    5. DOWNLOAD 5.1 Download Setup...

  • Page 87: Download Process

    5.2 Download Process Download step[1] Ⓑ Ⓒ Ⓐ Ⓐ : Start or Stop download Ⓑ : Selected configuration DLL file Ⓒ : File name donwloading File(F) → Exit(X) : End program Setting(S) → Configuration : configuration download condition DLL, SW files and etc. About(H) →...
  • Page 88 Download step[2] Ⓐ Ⓑ Ⓒ Ⓓ Ⓐ : Select a appropriated DLL file - You must select KP100_xxxxxx.DLL file. Ⓑ Select files downloaded -GB100- *.bin. Ⓒ : Select download speed -You must 460800. System supports maximum 460800bps. Ⓓ : Select port -select start and end port be operated...
  • Page 89 Download step[3] Ⓐ Ⓐ : Start download and stop download next step. If configuration is finished, then push start button and then button is changed to STOP. Turn on power of multi download and connector phones. If download is started, then push start button else program will download repeatedly.
  • Page 90 Download step[4] Ⓐ Ⓐ : This region appears donwload status. If download is finished, PASS or FAIL.message is showed.

  • Page 91: Block Diagram

    6. BLOCK DIAGRAM...

  • Page 98: Bga In Pin Check

    8. BGA IC PIN Check BGA PIN Check of main chip (Bottom view) Use U101 Main chip (PMB7880) Not Use (EUSY0317401)
  • Page 99 BGA PIN Check of Memory (Top View) Use U201 Memory (S71GL032N40BFW0P) Not Use (EUSY0328002)

  • Page 100: Pcb Layout

    9. PCB LAYOUT...
  • Page 101 U301 Speaker AMP No Speaker U101 BB chipset(PMB7880) No power on No service etc J501 I/O Connector No Charging etc U601 PAM(SKY77518/SKY77517) No TX & No RX X102 32.768KHz Crystal X6101 26MHz Crystal No Booting No TX & No RX U304 FM Speaker AMP J401 LCD Connector No sound...

  • Page 102: Engineering Mode

    10.Engineering Mode 1. Function Test 1.1 Test Purpose To verify handset functional is pass or fail when assembled by visual check. 1.2 Test Facilities List 1.Battery 2.Earphone 3.Charger 4.GSM tester (4201S) 5.Battery Cover 6.FM transmitter...
  • Page 103 1.3 Test Procedure 1.3.1 Auto test sequence 1. Operator not need to insert test SIM card, and enter ”*8*” to check “auto test” as below. 2. When operator into function test mode, we just press “yes” key or “enter” key to into next test item. 3.
  • Page 104 1.3.2 Test mode for after download MMI 1.3.2.1 Service information Test Operator not need to insert test SIM card, and enter”***” to check “Service information” as below. Service information Test Conducted Verifying item IMEI: Check IMEI number Software version: Read S/W Number & Version...

  • Page 105: Calibration

    11.Calibration 11.1 Test equipment setup 11.2 Calibration Steps Execute “HK_36.exe”...
  • Page 106 Click “SETTING” Menu Setup Logic operation such as the following figure Setup UART Port PWR : Power Supply Operation Mode CELL :Call-Test Equipment 1. By-Pass: not control by GPIB 2. Normal : control by GPIB...
  • Page 107 Select “MODEL” Click “START” for RF calibration RF Calibration finish...

  • Page 108: Stand Alone Test

    12. Stand alone test 12.1 Test program setting 12.1.1 Set COM port 12.1.2 Check PC Baud rate (115200) 12.1.3 Confirm EEPROM &Delta file prefix name...
  • Page 109 12.1.4 Press power on key, then click “V24AT#ON” and then “ Update Info” for communicating Phone and Test Program...
  • Page 110 12.1.5 For the purpose of the Stand alone Test ,Change the phone to ” ptest mode” and then click the “ Reset” bar 12.1.6 Select “Non signaling” in the Quick Bar menu. Then Stand alone Test set up finished.

  • Page 111: Tx Test

    12.2 TX Test 12.2.1 Click “Non signaling mode” bar and then confirm “OK” test in the command line. 12.2.2 Put the number of TX channel in the ARFCN. 12.2.3 Select “TX” in the RF mode menu and “PCL” in PA level menu . 12.2.4 Finally, Click “Write All”...

  • Page 112: Rx Test

    12.3 RX Test 12.3.1 Put the number of RX channel in the ARFCN. 12.2.2 Select “RX” in the RF mode menu. 12.2.3 Finally, Click “Write All” bar and try the efficiency test of phone.

  • Page 113: Exploded View& Replacement Partlist

    13. EXPLODED VIEW&REPLACEMENT PART LIST 13.1 Exploded View (GB108)

  • Page 115: Replacement Part

    Filter SAW_B39182B9308G110_GSM 900 & 1800 2in1_EPCOS_FOR GSM RX,50/150 OHM- 326-0000-00117 SFSY0038501 Saw Filter SMD10PIN Packing 479-00000-0048 MBAD0005204 BAG,VINYL(PE) 482-712000-001 GB108 Standard Box MBEF0132913 BOX,UNIT 478-711500-001 MLAC0003018 LABEL,BARCODE ADDITION 475-7120GR-001 Manual Assy . Operation Manual + Warranty card AMBA0153426 MANUAL ASSY, manual + warranty card 306-0000-00079 Li-ion Battery Cell Packing_3.7V_800mAh_BLACK_LGIP-431A-SBPL0092203_LG INNOTEK_Cell...

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