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LG C3400 Service Manual

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Service Manual
C3400
P/N : MMBD0046201
Date : March, 2005 / Issue 1.0

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  • Page 1 Service Manual C3400 P/N : MMBD0046201 Date : March, 2005 / Issue 1.0...

  • Page 2: Table Of Contents

    Table Of Contents ........ 1. INTRODUCTION 5. DISASSEMBLY INSTRUCTION 1.1 Purpose ..........2 5.1 Disassembly ........88 1.2 Regulatory Information ......2 5.2 Calibration .......... 95 1.3 Abbreviations ........4 6. BLOCK DIAGRAM ......98 ......... 2. PERFORMANCE 2.1 H/W Features ........6 ......

  • Page 3: Introduction

    1. INTRODUCTION 1. INTRODUCTION 1.1 Purpose This manual provides the information necessary to repair, calibration, 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 1. INTRODUCTION F. Pictures The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly different. G. Interference and Attenuation Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from unsuppressed engines or electric motors may cause problems. H.

  • Page 5: Abbreviations

    1. INTRODUCTION 1.3 Abbreviations For the purposes of this manual, following abbreviations apply: Automatic Power Control Baseband Bit Error Ratio CC-CV Constant Current – Constant Voltage Digital to Analog Converter Digital Communication System dB relative to 1 milli watt Digital Signal Processing EEPROM Electrical Erasable Programmable Read-Only Memory Electrostatic Discharge...
  • Page 6 1. INTRODUCTION Surface Acoustic Wave Subscriber Identity Module Sending Loudness Rating SRAM Static Random Access Memory PSRAM Pseudo SRAM STMR Side Tone Masking Rating Travel Adapter Time Division Duplex TDMA Time Division Multiple Access UART Universal Asynchronous Receiver/Transmitter Voltage Controlled Oscillator VCTCXO Voltage Control Temperature Compensated Crystal Oscillator Wireless Application Protocol...

  • Page 7: Performance

    2. PERFORMANCE 2. PERFORMANCE 2.1 H/W Features Item Feature Comment Li-ion, 1000mAh Standard Battery Battery Size : 34.15 (W) °ø53.55(H) °ø5.7(T) [mm] Battery Weight : 25g Under the minimum current consumption environment Stand by Current (such as paging period 9), the level of standby current is below 4mA.

  • Page 8: Technical Specification

    2. PERFORMANCE 2.2 Technical Specification Item Description Specification TX: 890 + n x 0.2 MHz RX: 935 + n x 0.2 MHz (n=1~124) EGSM Frequency Band TX: 890 + (n-1024) x 0.2 MHz RX: 935 + (n-1024) x 0.2 MHz (n=975~1024) TX: 1710 + (n-512) x 0.2 MHz RX: 1805 + (n-512) x 0.2 MHz (n=512~885) RMS <...
  • Page 9 2. PERFORMANCE Item Description Specification GSM, EGSM Offset from Carrier (kHz). Max. dBc +0.5 –30 –33 –60 600~ <1,200 –60 1,200~ <1,800 –60 1,800~ <3,000 –63 3,000~ <6,000 –65 Output RF Spectrum 6,000 –71 (due to modulation) Offset from Carrier (kHz). Max.
  • Page 10 2. PERFORMANCE Item Description Specification GSM, EGSM BER (Class II) < 2.439% @–102 dBm Bit Error Rate BER (Class II) < 2.439% @–100 dBm RX Level Report Accuracy ±3 dB 8±3 dB Frequency (Hz) Max.(dB) Min.(dB) –12 – – –12 Sending Response 1,000 –6...
  • Page 11 2. PERFORMANCE Item Description Specification At least 80 dB under below conditions: Ringer Volume 1. Ringer set as ringer. 2. Test distance set as 50 cm. Fast Charge : < 430 mA Charge Current Slow Charge : < 160 mA Antenna Bar Number Power –85 dBm ~...

  • Page 12: Technical Brief

    3. TECHNICAL BRIEF 3. TECHNICAL BRIEF 3.1 Transceiver (SI4205-BM, U502) The RF parts consist of a transmitter part, a receiver part, a frequency synthesizer part, a voltage supply part, and a VCTCXO part. The Aero I transceiver is the integrated RF front end for multi-band GSM/GPRS digital cellular handsets and wireless data modems.
  • Page 13 3. TECHNICAL BRIEF (1) Receiver Part The Aero I transceiver uses a low-IF receiver architecture which allows for the on chip integration of the channel selection filters, eliminating the external RF image reject filters and the IF SAW filter required in conventional super-heterodyne architectures. A.
  • Page 14 3. TECHNICAL BRIEF Figure. 3-2 SI4205 RECEIVER PART B. Intermediate frequency (IF) and Demodulation A quadrature image-reject mixer downconverts the RF signal to a 100KHz intermediate frequency (IF) with the RFLO from the frequency synthesizer. The RFLO frequency is between 1737.8 to 1989.9 MHz, and is internally divided by 2 for GSM 850 and E-GSM 900 modes.
  • Page 15 3. TECHNICAL BRIEF (2) Transmitter Part The transmit (Tx) section consists of an I/Q baseband upconverter, and offset phase-locked loop (OPLL) and two output buffers that can drive external power amplifiers (PA), one for the GSM 850 (824-849 MHz) and E-GSM 900 (880-915 MHz) bands and one for the DCS 1800 (1710-1785 MHz) and PCS 1900 (1850-1910MHz) bands.
  • Page 16 3. TECHNICAL BRIEF (3) Frequency Synthesizer Figure. 3-4 SI4205 FREQUENCY SYNTHESIZER PART The Aero I transceiver integrates two complete PLLs including VCOs, varactors, resonators, loop filters, reference and VCO dividers, and phase detectors. The RF PLL uses two multiplexed VCOs. The RF1 VCO is used for receive mode, and the RF2 VCO is used for transmit mode.

  • Page 17: Power Amplifier Module (Sky77325, U501)

    3. TECHNICAL BRIEF 3.2 Power Amplifier Module (SKY77325, U501) The SKY77325 Power Amplifier Module (PAM) is designed in a low profile (1.2 mm), compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation.

  • Page 18: 26 Mhz Clock (Vctcxo, X500)

    3. TECHNICAL BRIEF 3.3 26 MHz Clock (VCTCXO, X500) The 26 MHz clock(X500) consists of a TCXO(Temperature Compensated Crystal Oscillator) which oscillates at a frequency of 26 MHz. It is used within the Si4205, chipset (U102, AD6535), digital base band and MP3/AAC (U702) chipset. Figure 3-6 VCTCXO CIRCUIT DIAGRAM 2V75_VVCXO C528...

  • Page 19: Digital Main Processor (Ad6527B, U101)

    3. TECHNICAL BRIEF 3.5 Digital Main Processor (AD6527B, U101) AD6527/AD6527B GSM-PROCESSOR JTAGEN KEYPADCOL[7:0] Keypad KEYPADROW[7:0] TCK,TMS JTAG Matrix TDI,TDO BACKLIGHT[3.0] Backlight/ JTAG,HSL,GPIO Service Light Universal Servicelight USCTX/RX/CLK System Enhanced Generic Serial Port A Connector Generic Serial Port B Generic Serial Port D (USC) Flash ROMCS[1:0]...
  • Page 20 3. TECHNICAL BRIEF • AD6527B is an ADI designed processor. • AD6527B consists of 1. Control Processor Subsystem • 32-bit ARM7TDMI Control Processor • 58.5 MHz operation at 1.7V • On-board 16KB instruction/Data Cache • 1 Mbits of on-chip System SRAM 2.
  • Page 21 3. TECHNICAL BRIEF 3.5.1 Interconnection with external devices A. RTC block interface Countered by external X-TAL The X-TAL oscillates 32.768KHz B. LCD module interface The LCD module is controlled by CAMERA IC, CL761S If CL761S is in the state of by-pass mode, the LCD control signals from AD6527B are by-passed through CL761S.
  • Page 22 3. TECHNICAL BRIEF The backlight of LCD module is controlled by DBB via AAT2807 , U402. The control signals related to Backlight LED are given bellow. Signals Description C_FLASH Control flash ON and OFF (GPIO_24) LCD_DIM_CTL Control LCD backlight level in 16 steps (GPO 23) FLASH_LED Voltage source for FLASH LED...
  • Page 23 3. TECHNICAL BRIEF D. SIM interface The AD6527B provides SIM Interface Module. The AD6527B checks status periodically during established call mode whether SIM card is inserted or not, but it doesn't check during deep Sleep mode. In order to communicate with SIM card, 3 signals SIM_DATA, SIM_CLK, SIM_RST(GPIO_23)are required.
  • Page 24 3. TECHNICAL BRIEF 3.5.2 AD6527B Architecture AD6527/AD6527B AD6527/AD6527B AS6535 AS6535 SErial Link SErial Link Audio Baseband Audio Baseband Subststem Subststem and Power and Power Management Management DSP BUS DSP BUS EBUS EBUS PBUS PBUS DMA and BUS DMA and BUS PBUS 1M PBUS 1M ARBITRATION...

  • Page 25: Analog Main & Power Management Processor (Ad6535, U102)

    3. TECHNICAL BRIEF 3.6 Analog Main & Power Management Processor (AD6535, U102) AD6528 AD6535 LEDs Light Controllers Othello™ Crystal & Varactor GMSK Filter Filter Tone Filter Headhones or Headset Filter Filter Battery 11 Voltage Regulators Charger VCORE: 1.8 V, 80 mA VABB VMEM: 1.8 or 2.8 V, 150 mA VMIC: 2.5 V, 2 mA...
  • Page 26 3. TECHNICAL BRIEF • AD6535 is an ADI designed Analog Baseband processor. AD6535 covers the rocessing GMSK modulation interface, Aux ADC, Voice signal processing and Power Management. • AD6535 consists of 1. BB Transmit section • This section generates in-phase and quadrature BB modulated GMSK signals. •...
  • Page 27 3. TECHNICAL BRIEF 3.6.1 Baseband Transmit Section 1. The AD6535 Baseband Transmit Section is designed to support GMSK for both single- slot and multi-slot application. 2. The transmit channel consists of a digital GMSK modulator,a matched pair of 10-bit DACs and a matched pair of reconstruction filter.
  • Page 28 3. TECHNICAL BRIEF 3.6.3 Auxiliary Section 1. This section includes an Automatic Frequency Control(AFC)DAC,voltage reference buffers, an Auxiliary ADC,and light controllers. • AFC DAC:13 bits 2. This section also contains AUX ADC and Voltage Reference • IDAC:10 bits • The Auxiliary ADC provides : - Two differential inputs for temperature sensing.
  • Page 29 4. It interconnects with external devices like main microphone,main receiver,and headset. The descriptions of audio port used in C3400 are given bellow in detail. <Up Link> -AIN1P,AIN1N :Main microphone positive/negative terminal...

  • Page 30: Power Management

    3. TECHNICAL BRIEF 3.6.5 Power Management AD6535 CSFS Baseband Analog Control VABB CSDI LDO Regulator Serial CSDO Port Microphone VMIC 2.5 V, 2 mA LDO Regulator VCOREIN Digital Core 1.8 V, 80 mA LDO Regulator VCXO VVCXO VCORE 2.75 V, 10 mA LDO Regulator VMEMIN Memory Interface...
  • Page 31 3. TECHNICAL BRIEF AD6535 LDOEN VAPP Enable VAPPEn Control Bit Application LDO Regulator Mode VAPPmode Control Bit VCORE Enable Digital Core THERM Thermal LDO Regulator Shutdown Mode DDLO Enable Memory Interface VMEM UVLO LDO Regulator Mode CHGDET Enable VBAT External Interface VEXT VEXTmode Control Bit LDO Regulator...
  • Page 32 3. TECHNICAL BRIEF 3. Battery Charging Block 1. It can be used to charge Lithium Ion and/or Nickel Metal Hydride batteries. Charger initialization, trickle charging, and Li-Ion charging control are implemented in hardware. 2. Charging Process - Check charger is inserted or not - If AD6535 detects that Charger is inserted, the CC-CV charging starts.
  • Page 33 AUX_OUT_R EAR_SPK_R COM2 AOUT2P2 RCV_N AOUT2N1 AOUT2N2 C717 AOUT3L AUX_OUT_L AOUT3R AUX_OUT_R C137 C138 C139 C140 Figure 3-19. C3400 HEADSET SPEAKER CIRCUIT (AD6535) From Main Microphone AIN3L AIN3R AIN2P AUXIP AIN2N AUXIN VINNORP AIN1P AIN1N VINNORN NC_R12 U202 MAX4684EBC C130...
  • Page 34 3. TECHNICAL BRIEF (1%) NORMAL R122 1.2M IBIAS CHARGING VBAT C152 CRST VMEMSEL VCHARGE VBACKSEL NC_G16_VPLL_TE (1%) C143 R126 CHGDACREF (1%) (2012) C151 0.01u CHGOSC C126 D102 VBATSENSE VCHG CUS02 ISENSE R108 GATEDRIVE TPCF8102 Q100 AIN3L VCHARGE VBAT VCHARGE Pre_CHARGING R218 C216 R217...

  • Page 35: Memory (Rd38F3350Llzdq0, U302)

    3. TECHNICAL BRIEF 3.7 Memory (RD38F3350LLZDQ0, U302) Figure 3-22. MEMORY BLOCK DIAGRAM • 128Mbits flash memory + 128Mbits flash memory + 64Mbits PSRAM • 16 bit parallel data bus • ADD01 ~ ADD23. • RF Calibration data, Audio parameters and battery calibration data etc are stored in Flash memory area.

  • Page 36: Display And Interface

    3. TECHNICAL BRIEF 3.8 Display and Interface • Main LCD Properties Spec. Unit Active Screen Size 28.022(H) X 35.03(V) Color Depth 65,000 colors Resolution 128 X RGB X 160 dots Pixel Size 0.063(H) X 0.209(V) • Sub LCD Properties Spec. Unit Active Screen Size 18.902(H) X 13.43(V)
  • Page 37 3. TECHNICAL BRIEF R604 4.7K R605 4.7K C604 C603 C602 0.1u C600 R611 100K R635 100K 2V8_VEXT SUB_LCD_DET R634 100K 2V8_VEXT MONO_COLOR Figure 3-23. LCD INTERFACE CIRCUIT - 36 -...

  • Page 38: Camera Interface

    3. TECHNICAL BRIEF 3.9 Camera Interface C3400 has a built-in VGA(640 x 480) camera module. And the camera produces JPG pictures. Camera module is controlled by CL761S. Interface is done by I2C and YCbCr format. I2C is a control signal and YCbCr is real data interface signal.
  • Page 39 3. TECHNICAL BRIEF CL761S is using 2V85_VCAM power and camera module is using 2V85_VCAM via transistor. CL761S controls transistor. If control signal is high, camera power is off. Otherwise camera power is on. Camera power CAMERA CTL IC Camera interface signal C_PWDN STATUS 2V8_C_PWR...

  • Page 40: Keypad Switches And Scanning

    3. TECHNICAL BRIEF 3.10 Keypad Switches and Scanning The key switches are metal domes, which make contact between two concentric pads on the keypad layer of the PCB when pressed. There are 27 switches (Normal Key 24EA, Camera side key, Volume up down side key), connected in a matrix of 5 rows by 5 columns and additional GPIO 35 for KEY_ROW5, as shown in Figure 3-24, except for the power switch (KB1), which is connected independently.

  • Page 41: Microphone

    Figure 3-28. Connection between Microphone and AD6535 3.12 Main Speaker In the case of C3400 , there are 3 different speakers. One is main speaker for the received voice, another are loud speaker for playback of ring tone , key tone and other MIDI sounds and the other is headset speaker.

  • Page 42: Headset Interface

    3. TECHNICAL BRIEF 3.13 Headset Interface This phone chooses a 6 pin type headset which has 6 electrodes such as GND, AUXIP, AUXIN (this pin is floating), EAR_SPK_R, EAR_SPK_L, JACK_DETECT, HOOK_DETECT. This type supports stereo sound Switching from Receiver to Headset Jack If jack is inserted, JACK_DETECT goes from low to high.

  • Page 43: Mp3/Aac Decoder(Upd9993, U702) & Amplifier(Lm4923, U703)

    • supports differential MONO output and stereo output • supports 1.5V core and 3.0V or 1.8V IO interface C3400 is using a external amplifier. This amplifier supports differential MONO output for main speaker and stereo output for headset speaker. • Output Power at 1% THD+N, 1kHz : - for 8ohm, typically 1.1W...
  • Page 44 3. TECHNICAL BRIEF DGND1 DVDD1 DGND2 DVDD2 DGND3 DVDD3 DGND4 DVDD4 DVDD5 EGND EVDD AGND1 AGND2 AVDD AVDD_P AGND_P NC19 NC20 NC21 NC22 NC23 NC24 R710 C715 220n C720 C721 Figure 3-30. MP3/AAC DECODER & AMPLIFIER CIRCUIT - 43 -...

  • Page 45: Key Back-Light Illumination

    3. TECHNICAL BRIEF 3.15 Key Back-light Illumination In key back-light illumination, there are 12 Blue LEDs in Main Board, which are driven by KEY_BACKLIGHT signal from AD6527B. Keybacklight C322 On/Off control C323 Signal C310 C311 C313 LD300 R332 LEBB-S14H LD303 R335 LEBB-S14H LD304...

  • Page 46: Lcd Back-Light Illumination

    3. TECHNICAL BRIEF 3.16 LCD Back-light Illumination LCD backlight LEDs is controlled by DBB via AAT2807, U402. WHITE/FLASH LED LDO VBAT FB400 R409 2V8_VEXT VOUT_FL FLASH_LED FB403 C406 U402 VOUT_BL MLED AAT2807AIXN-4.5 R420 PGND C_FLASH EN_FLSH ISINK1 MLED1 R410 1.5K ISINK2 MLED2 LCD_DIM_CTL...

  • Page 47: Vibrator

    3. TECHNICAL BRIEF 3.17 VIBRATOR The vibrator is placed in the folder cover and contacted to LCD MODULE. The vibrator is driven from VIBRATOR (GPIO_3) of AD6527B. VBAT R351 VBAT R350 R352 Q300 VIBRATOR R353 1.5K VIBRATOR R354 MOTOR 7.5K C328 EMZ2 4.7u...

  • Page 48: Troubleshooting

    4. Troubleshooting 4. TROUBLESHOOTING 4.1 RX Trouble TEST POINT FL500 SW500 U501 X500 U503 Figure 4-1(a) - 47 -...
  • Page 49 4. Troubleshooting Checking Flow START HP8960 : Test mode 62 CH, 7 level setting (TCH) 62CH, -60dBm setting (BCCH) Spectrum analyzer setting Oscilloscope setting Check regulator circuit Check VCTCXO Check ANT SW & Mobile SW Check SAW filter circuit Check RX IQ Redownload SW or Do calibration again...
  • Page 50 4. Troubleshooting (1) Checking Regulator Circuit TEST POINT U503. 3 U503. 5 Figure 4-2 CIRCUIT RF_LDO RF2.85V VBAT U503 CLKON C536 C535 C539 4.7u MIC5255-2.85BM5 4.7u (1608) (1608) Checking Flow Voltage at Level at Change main board Pin5 of U503 Pin3 of U503 Is 2.85V? Is high?
  • Page 51 4. Troubleshooting (2) Checking VCTCXO Circuit TEST POINT Checking Flow X500. 4 VCTCXO Circuit is OK Check Pin 3. 26 MHzO.K? See next Page to check Refer to Graph 4-1(b) ANT SW & Mobile SW X500. 3 2.75V OK? Changing X500 Check Pin 4.
  • Page 52 4. Troubleshooting (3) Checking Ant SW & Mobile SW TEST POINT SW500. RF FL500. 10 FL500. 10 FL500. 1 CIRCUIT C537 (VC1) C531 (VC2) ANT500 ANT501 ANT502 C500 1.2p L509 3.3nH Figure 4-5 L500 22nH Waveform SW500 ENWY0002201 C508 FL500 GND1 GND2 EGSM_TX...
  • Page 53 4. Troubleshooting Checking Flow For these 2 test case, No Call connection is needed Check SW500 Pin ANT,RF Changing SW500 Open with RF Cable connected. Check SW500 Pin ANT,RF Short Changing SW500 with No RF Cable Connected Check C537,C531 VC1 :Low Changing the Board.
  • Page 54 4. Troubleshooting (4) Checking SAW Filter Circuit TEST POINT CIRCUIT C513 FL401 FL402 L501 FL401 27nH EFCH942MTCA7 C518 C521 L503 FL402 6.8nH EFCH1842TCA7 C522 Figure 4-6 Checking Flow Check RF Level of Changing FL401 FL401.3: ~ -64dBm Soldering is Saw Filter Input for GSM, FL402 FL402.3: ~ -64dBm For GSM : FL401.3...
  • Page 55 4. Troubleshooting (5) Checking RX IQ TEST POINT CIRCUIT U502 C519 C526 Figure 4-7 Waveform Graph 4-4 Checking Flow Check C519,C526. Check if there is any Similar? Replace U502 Major difference Refer to graph 4-4 Redownload software and calibration againg - 54 -...

  • Page 56: Tx Trouble

    4. Troubleshooting 4.2 TX Trouble TEST POINT FL500 SW500 U501 X500 U503 Figure 4-8 - 55 -...
  • Page 57 4. Troubleshooting Checking Flow START HP8960 : Test mode 62 CH, 7 level setting (TCH) 62CH, -60dBm setting (BCCH) Spectrum analyzer setting Oscilloscope setting Check regulator circuit Check VCTCXO Check ANT SW & Mobile SW Check PAM control signal Check TX IQ Redownload SW or Do calibration again...
  • Page 58 4. Troubleshooting (1) Checking Regulator Circuit TEST POINT U503. 5 U503. 3 Figure 4-2 CIRCUIT RF_LDO RF2.85V VBAT U503 CLKON C536 C535 C529 4.7u MIC5255-2.85BM5 4.7u (1608) (1608) Checking Flow Voltage at Level at Change main board Pin5 of U503 Pin3 of U503 Is 2.85V? Is high?
  • Page 59 4. Troubleshooting (2) Checking VCTCXO Circuit TEST POINT Checking Flow VCTCXO Circuit is OK 26 MHzO.K? See next Page to check Check Pin 3. X500. 4 X500. 3 ANT SW & Mobile SW Refer to Graph 4-1(b) 2.75V OK? Changing X500 Check Pin 4.
  • Page 60 4. Troubleshooting (3) Checking Ant SW & Mobile SW SW500. RF TEST POINT FL500. 10 FL500. 10 FL500. 1 CIRCUIT C537 (VC1) C531 (VC2) ANT500 ANT501 ANT502 Figure 4-5 C500 1.2p L509 Waveform 3.3nH L500 22nH SW500 ENWY0002201 C508 FL500 GND1 GND2 EGSM_TX...
  • Page 61 4. Troubleshooting Checking Flow For the test, TX Stand alone Mode is needed. Refer to chapter 11 (PL=7 for GSM, PL=2 for DCS) Check C531,C537 Check whether Ant SW Check VC1, VC2 Changing board Set as TX mode efer to Graph 4-6 efer to Table 6-11 Check RF Level of Pin5 : ~29.5dBm...
  • Page 62 4. Troubleshooting (4) Checking PAM Control Signal Checking Flow TEST POINT VBAT R501 GPO_17 PA_BAND C501 C507 R502 GPO_16 PA_EN RF2.85V RF2.85V C509 PA_EN (R502) C532 C525 100p PAC_ENABLE C516 R503 GSM_IN 26MHz TX_RAMP (R509) 1000p R504 R505 DCS_PCS_IN R506 C526 R507 R508...
  • Page 63 4. Troubleshooting (5) Checking TX IQ TEST POINT Waveform U502 C519 C526 Graph 4-8 Figure 4-13 CIRCUIT Checking Flow Check if there is Replace U102 Similar? Any Major Difference Refer to Graph 4-8 Redownload the Software And calibrate - 62 -...

  • Page 64: Power On Trouble

    4. Troubleshooting 4.3 Power On Trouble TEST POINT C117 C121 C122 C155 C154 C113 C114 C115 C116 C118 C113 CIRCUIT - 63 -...
  • Page 65 4. Troubleshooting Checking Flow START Check Battery Voltage Charge or Change Battery > 3.35V ? Push power-on key Check the contact of power key And check the level change Or dome-switch of PWRKEY Check the voltage of Replace U102 The LDO outputs at U102 VCORE=1.8V VVCXO=2.75V VMEM=2.8V...

  • Page 66: Charging Trouble

    4. Troubleshooting 4.4 Charging Trouble TEST POINT R106 Q100 R108 D102 CIRCUIT (1%) R122 1.2M IBIAS VBAT C152 CRST VMEMSEL VCHARGE VBACKSEL NC_G16_VPLL_TE (1%) C143 R126 CHGDACREF C151 0.01u (1%) (2012) CHGOSC C126 D102 VBATSENSE CUS02 VCHG ISENSE R108 GATEDRIVE TPCF8102 Q100 - 65 -...
  • Page 67 4. Troubleshooting Checking Flow START Resolder the CN300 I/O Connector(CN300) Pin 4,5 : VCHARGE Is well-soldered ? Pin12,19 : GND The TA is out of order Voltage at anode of Change the TA D102 = 5.2V ? Resolder the Q100,D102,R106 are Q100, D102, R106 well-soldered? Replace the...

  • Page 68: Vibrator Trouble

    4. Troubleshooting 4.5 Vibrator Trouble TEST POINT R354 R351 R353 R350 Q300 R352 Soldering Check in LCD Module CIRCUIT VBAT R351 VBAT R350 R352 Q300 VIBRATOR R353 1.5K VIBRATOR R354 MOTOR 7.5K C328 EMZ2 4.7u - 67 -...
  • Page 69 4. Troubleshooting Checking Flow SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu START Is the voltage at pin 3 Check the soldering of Q300 high ? of R353, R354 Resolder R353, R354 Is the voltage at pin 2 Check the soldering of R351...

  • Page 70: Lcd Trouble

    4. Troubleshooting 4.6 LCD Trouble TEST POINT FL604 FL602 FL600 CN601 FL603 FL601 Camera Module connection LCD Module connection LCD Module Connector ( 20Pin, female ) connector( 40Pin, male ) - 69 -...
  • Page 71 4. Troubleshooting Checking Flow START Is the connection of FPCB with connector on Reassemble FPCB with CN601 connector PCB(CN601) ok ? Check the connection LCD Reassemble LCD module with connector on FPCB module with connector On FPCB ? Check the soldering of Resoldering CN601 CN601 ? Change the FPCB and try again...

  • Page 72: Camera Trouble

    4. Troubleshooting 4.7 Camera Trouble TEST POINT FL607 FL606 CN601 FL605 FL608 U401 Q400 Camera Module Connector ( 20Pin, male ) LCD Module - 71 -...
  • Page 73 4. Troubleshooting Checking Flow START Does the LCD itself Go to the LCD trouble Has no trouble ? Replace the U401 Check the voltage Check the voltage Change the camera of pin 3 of of pin 1 of module, Does it work Q400 LOW ? Q400 is 3V ? properly ?

  • Page 74: Speaker Trouble

    4. Troubleshooting 4.8 Speaker Trouble TEST POINT CN601 U703 C710 C707 C706 C709 Soldering Check U702 - 73 -...
  • Page 75 4. Troubleshooting Checking Flow START The level of pin 3 of U703 Replace U101 is LOW ? Is there problem at Is there voltage level at Replace component C706, C707, C709, C710 Pin 2 or 6 of U703 ? R703, R707 ? Replace U702 Is there problem at Is there problem at...

  • Page 76: Sim Card Interface Trouble

    4. Troubleshooting 4.9 SIM Card Interface Trouble TEST POINT J300 CIRCUIT DIAGRAM 2V85_VSIM 2V85_VSIM SIM CONNECTOR R346 SIM_RST R348 R349 SIM_DATA SIM_CLK - 75 -...
  • Page 77 4. Troubleshooting Checking Flow START Change the SIM Card. Our phone Does the SIM cards supports only 3V SIM card. supports 3V ? Voltage output Voltage at pin1 of Resolder J300 of VSIM LCD J300 is 2.85V? Is 2.85V? Replace J300 Change the SIM Card Redownload SW.

  • Page 78: Earphone Trouble

    4. Troubleshooting 4.10 Earphone Trouble TEST POINT R228 C217 U200 C209 R210 CIRCUIT DIAGRAM 2V5_JACK R202 C289 R203 R204 R211 0.1u 1.5K AUXIN HOOK_DETECT CLOSE TO EARJACK R206 C205 C206 C277 C204 0.1u 2V8_VEXT 2V8_VEXT R201 J200 C200 C209 R210 EAR_SPK_L R214 R213...
  • Page 79 4. Troubleshooting Checking Flow START Resolder J200 Does the audio Level at pin1 profile of the phone Replace U200 of U200 is high change to the earphone mode? Resolder component Set the audio part of the test equipment to Download software Set the audio part of the test Change the earphone PRBS or continuous...

  • Page 80: Key Backlight Trouble

    4. Troubleshooting 4.11 KEY backlight Trouble .TEST POINT - 79 -...
  • Page 81 4. Troubleshooting CIRCUIT DIAGRAM VBAT VBAT KEY BACKLIGHT Q301 R373 KEY_BACKLIGHT R364 C340 IMX9T110 Checking Flow START Is the level at R390 Check U101 High? Are all LEDs Check the soldering Working? each R and LED Replace or resoldering Backlight will work properly. component - 80 -...

  • Page 82: Receiver Trouble

    4. Troubleshooting 4.12 Receiver Trouble TEST POINT CN601 R111 R113 CIRCUIT DIAGRAM R111 AOUT1P RCV_P C136 AOUT1N AOUT2P1 SPKP_P R113 AOUT2P2 RCV_N AOUT2N1 SPKP_N AOUT2N2 AOUT3L AUX_OUT_L C137 C138 AOUT3R AUX_OUT_R C139 C140 - 81 -...
  • Page 83 4. Troubleshooting Checking Flow SETTING : After initialize Agilent 8960, Test EGSM, DCS mode Set the property of audio as PRBS or continuous wave. Set the receiving volume of mobile as Max. START Does waveform at Replace main board R111 and R113 fluctuate? Is CN601 connected Reassemble CN601...

  • Page 84: Microphone Trouble

    4. Troubleshooting 4.13 Microphone Trouble TEST POINT C202 C207 R209 C203 R200 R208 R205 C218 C208 R212 CIRCUIT DIAGRAM 2V5_VMIC R200 R205 C202 C203 2.2K R209 R208 MIC200 VINNORP C207 C208 C218 R212 SOB-413S44-RC3310 VINNORN 0.1u C211 C210 R215 2.2K CLOSE TO MIC - 83 -...
  • Page 85 4. Troubleshooting Checking Flow SETTING : After initialize Agilent 8960, Test EGSM, DCS mode START Voltage across C224 Voltage VMIC of U102 Replace U102 = DC 2.5V ? = DC 2.5V? Resolder R200 & R205. Check the signal Level at each side Replace microphone of MIC200.

  • Page 86: Rtc Trouble

    4. Troubleshooting 4.14 RTC Trouble TEST POINT X101 R109 CIRCUIT DIAGRAM _SUB_CS GPIO_43_NSUB_LCD_CS X101 C150 1000p CLKIN CLKON CLKON OSCOUT R109 OSCIN PWRON NRESET _RESET MC-146_7pF C142 32.768KHz GPIO_0_IRDA_TX GPIO_1_IRDA_RX GPIO 2 NIRDA EN - 85 -...

  • Page 87: Indication Led Trouble

    4. Troubleshooting 4.15 Indication LED Trouble TEST POINT Q200 R225 R218 LD200 R226 Q201 R223 CIRCUIT DIAGRAM VCHARGE VBAT VCHARGE R218 C216 R217 LD200 R221 Q201 R222 R223 Q200 RPWRON 7.5K 2SC5585 R224 R225 R226 100K UMX1NTN - 86 -...

  • Page 88: Folder On/Off Trouble

    4. Troubleshooting 4.16 Folder on/off Trouble TEST POINT U403 CIRCUIT DIAGRAM R418 FLIP C411 C412 C488 U403 0.1u 330p A3212ELH - 87 -...

  • Page 89: Disassembly Instruction

    5. DOWNLOAD AND CALIBRATION 5. DOWNLOAD AND CALIBRATION 5.1 Download A. Download Setup Figure 5-1 describes Download setup UART (If you have battery, no TA is needed) Figure 5-1. Download Setup - 88 -...
  • Page 90 5. DOWNLOAD AND CALIBRATION B. Download Procedure 1. Access Flash loader program in PC and select Erase.(Don’t check OWCD) 1. Select Erase 2. Check 3. Don’t Check OWCD 2. Press Start and Wait until Erase is completed. 1. Press Start and Wait - 89 -...
  • Page 91 5. DOWNLOAD AND CALIBRATION 3. Change Address and Size(Address : 18000000, Size : 0x800000), and Press Start and Wait until Erase is completed again. 1. Change Address and Size 3. Press Start 2. Don’t Check and Wait OWCD 4. Press Write to start Download and press Key to choose software (AlchemyData.mot) 1.
  • Page 92 5. DOWNLOAD AND CALIBRATION 5. Choose software 1. Select File 2. Press Open 6. Wait until converting from MOT to BIF is completed(Don’t check OWCD) 2. Wait until 1. Don’t Check OWCD completion - 91 -...
  • Page 93 5. DOWNLOAD AND CALIBRATION 7. Press Start and Power on the phone using JIG remote Power on(Switch 1) 1. Press Start 2. Turn on Switch VBAT 8. Wait until Sending Block is completed 1. Wait Until Sending Block is completed - 92 -...
  • Page 94 5. DOWNLOAD AND CALIBRATION 9. Press Write to start Download and press Key to choose software(CodeData.mot) 1. Press 2. Press 10. Choose software 1. Press Start 2. Turn on Switch VBAT - 93 -...
  • Page 95 5. DOWNLOAD AND CALIBRATION 11. Wait until Sending Block is completed 1. Wait Until Sending Block is completed - 94 -...

  • Page 96: Calibration

    5. DOWNLOAD AND CALIBRATION 5.2 Calibration A. Equipment List Equipment for Calibration Type/Model Brand Wireless Communication Test Set HP-8960 Agilent RS-232 Cable and Test JIG RF Cable Power Supply HP-66311B Agilent GPIB interface card HP-GPIB Agilent Calibration & Final test software Test SIM Card PC (for Software Installation) Pentium II class above 300MHz...
  • Page 97 5. DOWNLOAD AND CALIBRATION JTAG2 JTAG1 Status ADI-REMOTE TI-REMOTE POWER VBAT UART Status POWER Figure 5-3 The top view of Test JIG C. Test Jig Operation Power Source Description Power Supply usually 4.0V Travel Adaptor Use TA, name is TA-20G (24pin) Table 5-2.
  • Page 98 5. DOWNLOAD AND CALIBRATION 1. Connect as Fig 5-2(RS232 serial cable is connected between COM port of PC and MON port of TEST JIG, in general) 2. Set the Power Supply 4.0V 3. Set the 3 rd , 4 th of DIP SW ON state always 4.

  • Page 99: Block Diagram

    6. BLOCK DIAGRAM 6. BLOCK DIAGRAM - 98 -...

  • Page 100: Circuit Diagram

    NAME KEY_COL2 KEYPADCOL2 USC4 USC4 Approved USB BOOT EXT CLOCK KEY_COL3 KEYPADCOL3 USC5 USC5 Song yoon seok 05/01/17 KEY_COL4 KEYPADCOL4 USC6 USC6 DRAWING Iss. Notice No. Date Name Ver 1.1 LG Electronics Inc. LGIC(42)-A-5505-10:01 LG Electronics Inc. - 99 -...
  • Page 101 MODEL C3400 Park bae sun Designer 05/01/17 Checked Kim kil su 05/01/17 DRAWING AUDIO / PreCharge NAME Approved 05/01/17 Song yoon seok DRAWING Iss. Notice No. Date Name Ver 1.1 LG Electronics Inc. LGIC(42)-A-5505-10:01 LG Electronics Inc. - 100 -...
  • Page 102 MEMORY, MMI, I/O EMZ2 C328 VSS3 NAME VSS4 _OE1 Approved R356 05/01/17 Song yoon seok 4.7u VSS5 _OE2 VSS6 _RST _RESET VSS7 WAIT _WAIT R357 VSS8 BURSTCLK DRAWING Ver 1.1 LG Electronics Inc. LGIC(42)-A-5505-10:01 LG Electronics Inc. - 101 -...
  • Page 103 MODEL Park bae sun Designer 05/01/17 Checked Kim gil su 05/01/17 DRAWING CAMERA IC/ CHARGE PUMP NAME Approved Song yoon seok 05/01/17 DRAWING Iss. Notice No. Date Name LG Electronics Inc. Ver 1.1 LGIC(42)-A-5505-10:01 LG Electronics Inc. - 102 -...
  • Page 104 Sign & Name Sheet/Sheets MODEL C3400 Designer Kim sang jun 05/01/17 Checked Lee ki sung 05/01/17 DRAWING NAME Approved 05/01/17 Song yoon seok DRAWING Iss. Notice No. Date Name Ver 1.1 LG Electronics Inc. LGIC(42)-A-5505-10:01 LG Electronics Inc. - 103 -...
  • Page 105 MODEL Sheets C3400 IM sang ho Designer 05/01/17 Checked 05/01/17 Kim kil su DRAWING LCD CONNECTOR NAME Approved 05/01/17 Song yoon seok DRAWING Iss. Notice No. Date Name Ver 1.1 LG Electronics Inc. LGIC(42)-A-5505-10:01 LG Electronics Inc. - 104 -...
  • Page 106 MAX4684EBC MIDI_AUDIO_SEL AMP_SD MIDI_AUDIO_SEL AMP DEACTIVE AUDIO(TO EARJACK) AUX_OUT_L COM1 EAR_SPK_L AMP ACTIVE MIDI(TO EARJACK) AUX_OUT_R COM2 EAR_SPK_R C717 C3400 Park Bae Sun 05/01/17 Kim kil su 05/01/17 MP3 / AAC Song yoon seok 05/01/17 Ver 1.1 - 105 -...

  • Page 107: Pcb Layout

    8. PCB LAYOUT 8. PCB LAYOUT - 106 -...
  • Page 108 8. PCB LAYOUT - 107 -...
  • Page 109 Note - 108 -...

  • Page 110: Engineering Mode

    9. ENGINEERING MODE 9. ENGINEERING MODE A. About Engineering Mode Engineering mode is designed to allow a service man/engineer to view and test the basic functions provided by a handset. B. Access Codes The key sequence for switching the engineering mode on is 2945#*#. Pressing END will switch back to non-engineering mode operation.

  • Page 111: Bb Test [Menu 1]

    9. ENGINEERING MODE 9.1 BB Test [MENU 1] 9.1.1 LCD 1) Contrast value: This menu is to control LCD Backlight from contrast value=80 to contrast value=100. 9.1.2 Camera 1) Main LCD preview : This menu is to test Camera preview on Main LCD screen. 2) Sub LCD Preview : This menu is to test Camera preview on Sub LCD screen.

  • Page 112: Rf Test [Menu 2]

    9. ENGINEERING MODE 9.1.8 Audio This is a menu for setting the control register of Voiceband Baseband Codec chip. Although the actual value can be written over, it returns to default value after switching off and on the phone. 1) VbControl1 : VbControl1 bit Register Value Setting 2) VbControl2 : VbControl2 bit Register Value Setting 3) VbControl3 : VbControl3 bit Register Value Setting 4) VbControl4 : VbControl4 bit Register Value Setting...

  • Page 113: Trace Option [Menu 4]

    9. ENGINEERING MODE 9.3.5 LCD 1)LCD Main LCD screen resolution tests horizontally and vertically one by one and fills the screen. 2)SubLCD Sub LCD screen resolution tests horizontally and vertically one by one and fills the screen. 9.3.6 Key pad When a pop-up message shows ‘Press Any Key’, you may press any keys including side keys, but not [Soft2 Key].

  • Page 114: Stand Alone Test

    10. STAND ALONE TEST 10. STAND ALONE TEST 10.1 Introduction This manual explains how to examine the status of RX and TX of the model. A. Tx Test TX test - this is to see if the transmitter of the phones is activating normally. B.

  • Page 115: Means Of Test

    10. STAND ALONE TEST 10.3 Means of Test a. Select a COM port b. Set the values in Tx or Rx c. Select band and channel d. After setting them all above, press connect button. e. Press the start button HW Test Gain Control Index Power Level...
  • Page 116 10. STAND ALONE TEST HW Test Gain Control Index Power Level Scaling Factor RSSI Level Signal Connect Signal Flow Send Receive Figure 10-1. HW test program Figure 10-1. HW test program - 115 -...

  • Page 117: Auto Calibration

    11.AUTO CALIBRATION 11. AUTO CALIBRATION 11.1 Overview Autocal (Auto Calibration) is the PC side Calibration tool that perform Tx ,Rx and Battery Calibration with Agilent 8960 (GSM call setting instrument) and Tektronix PS2521G (Programmable Power supply). Autocal generate calibration data by communicating with phone and measuring equipment then write it into calibration data block of flash memory in GSM phone.
  • Page 118 11.AUTO CALIBRATION Figure 11-1. Auto Calibration Program Screen ➝ Cable loss : Enter the RF cable loss GSM and DCS Screen ➝ GPIB(Primary address) : Enter the SS(Ag8960) and PS(Tektronix PS2521G) GPIB address Screen ➝ ADC Channel : Default ADC Calibration Channel Screen ➝...

  • Page 119: Agc

    11.AUTO CALIBRATION 11.4 AGC This procedure is for Rx calibration. In this procedure, We can get RSSI correction value. Set band EGSM and press Start button the result window will show correction values per every power level and gain code and the same measure is performed per every frequency.

  • Page 120: Exploded View & Replacement Part List

    12. EXPLODED VIEW & REPLACEMENT PART LIST 12. EXPLODED VIEW & REPLACEMENT PART LIST 12.1 EXPLODED VIEW - 119 -...
  • Page 121 Note. - 120 -...

  • Page 122: Replacement Parts < Mechanic Component

    APEY0188101 C3400 RUSTL, PHONE ASSEMBLY Titanium Black ABGA00 BUTTON ASSY,DIAL ABGA0003604 C3400 RUS, KEYPAD, MP3 & Download key, English, Titanium Silver Titanium Silver ACGG00 COVER ASSY,FOLDER ACGG0051104 C3400 RUS, ASSY FOLDER, MP3 & LG logo, Titanium Black Titanium Black ACGH00...
  • Page 123 TAPE,PROTECTION MTAB0059701 GE200 TAPE,PROTECTION (FOLDER) MWAE00 WINDOW,CAMERA MWAE0005101 C3300, LENS CAMERA ACGM00 COVER ASSY,REAR ACGM0042703 C3400, ASSY MAIN REAR, Titanium Silver Titanium Silver MCCC00 CAP,EARPHONE JACK MCCC0019301 C3300 , CAP EARPHONE JACK, Silver Silver MCJN00 COVER,REAR MCJN0029002 C3400, REAR, Titanium Siver...

  • Page 124: Main Component

    R,G,B ,3 LED,3.5*2.8*1.8 ,R/TP ,Flash LED ENBY00 CONNECTOR,BOARD TO BOARD ENBY0014501 40 PIN,0.4 mm,ETC , , SPCY00 PCB,FLEXIBLE SPCY0043801 POLYI ,0.5 mm,MULTI-4 ,C3400 FPCB SBCL00 BATTERY,CELL,LITHIUM SBCL0001303 2 V,1 mAh,COIN ,SOLDER TYPE BACKUP BATTERY SJMY00 VIBRATOR,MOTOR SJMY0002602 3.0 V,80 mA,12*3.4 ,...
  • Page 125 12. EXPLODED VIEW & REPLACEMENT PART LIST Level Location No. Description Part Number Specification Color Remark C152 CAP,CERAMIC,CHIP ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP C155 CAP,CERAMIC,CHIP ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP C160 CAP,CERAMIC,CHIP ECCH0000163 47 nF,10V,K,X5R,HD,1005,R/TP C170 CAP,CERAMIC,CHIP ECCH0000167...
  • Page 126 12. EXPLODED VIEW & REPLACEMENT PART LIST Level Location No. Description Part Number Specification Color Remark C509 CAP,CERAMIC,CHIP ECCH0000117 27 pF,50V,J,NP0,TC,1005,R/TP C510 CAP,CERAMIC,CHIP ECCH0000117 27 pF,50V,J,NP0,TC,1005,R/TP C512 CAP,CERAMIC,CHIP ECCH0000101 .5 pF,50V ,C ,NP0 ,TC ,1005 ,R/TP C513 CAP,CERAMIC,CHIP ECCH0000102 1 pF,50V ,C ,NP0 ,TC ,1005 ,R/TP C514 CAP,CERAMIC,CHIP ECCH0000115...
  • Page 127 12. EXPLODED VIEW & REPLACEMENT PART LIST Level Location No. Description Part Number Specification Color Remark FL605 FILTER,EMI/POWER SFEY0007103 SMD ,18 V, ,SMD ,4ch. R-Varistor Array(50Ohm,15pF) FL606 FILTER,EMI/POWER SFEY0007103 SMD ,18 V, ,SMD ,4ch. R-Varistor Array(50Ohm,15pF) FL607 FILTER,EMI/POWER SFEY0007103 SMD ,18 V, ,SMD ,4ch. R-Varistor Array(50Ohm,15pF) FL608 FILTER,EMI/POWER SFEY0007103...
  • Page 128 12. EXPLODED VIEW & REPLACEMENT PART LIST Level Location No. Description Part Number Specification Color Remark R313 RES,CHIP ERHY0000220 100 ohm,1/16W,J,1005,R/TP R315 RES,CHIP ERHY0000213 47 ohm,1/16W,J,1005,R/TP R316 RES,CHIP ERHY0000213 47 ohm,1/16W,J,1005,R/TP R317 RES,CHIP ERHY0000213 47 ohm,1/16W,J,1005,R/TP R320 RES,CHIP ERHY0000273 47K ohm,1/16W,J,1005,R/TP R321 RES,CHIP ERHY0000213...
  • Page 129 12. EXPLODED VIEW & REPLACEMENT PART LIST Level Location No. Description Part Number Specification Color Remark R710 RES,CHIP ERHY0000275 56K ohm,1/16W,J,1005,R/TP SW500 CONN,RF SWITCH ENWY0002201 ANGLE ,SMD ,0.8 dB, U101 EUSY0251701 BGA ,204 PIN,R/TP ,Digital BaseBand Hermes+USB SC70-5 ,5 PIN,R/TP ,1.8V Low Voltage Comparator with U200 EUSY0077701 Rail-to-Rail Input...
  • Page 130 12. EXPLODED VIEW & REPLACEMENT PART LIST Level Location No. Description Part Number Specification Color Remark R304 RES,CHIP ERHY0000237 680 ohm,1/16W,J,1005,R/TP R305 RES,CHIP ERHY0000237 680 ohm,1/16W,J,1005,R/TP R332 RES,CHIP ERHY0000217 75 ohm,1/16W,J,1005,R/TP R335 RES,CHIP ERHY0000217 75 ohm,1/16W,J,1005,R/TP R336 RES,CHIP ERHY0000217 75 ohm,1/16W,J,1005,R/TP R337 RES,CHIP ERHY0000217...

  • Page 131: Accessory

    SGDY0005601 DK-40G ,K8000 24PIN I/O + USB A TYPE SGEY00 EAR PHONE/EAR MIKE SET SGEY0003501 SRCY00 CDROM SRCY0001348 S/W ,NONE ,C3400 CD ,650 MB, SSAD00 ADAPTOR,AC-DC SSAD0007828 100-240V ,60 Hz,5.2 V,800 mA,CE,CB,GOST ,EU PLUG(24P),STD WSYY00 SOFTWARE WSYY0209601 - 130 -...

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