LG 55G2 Service Manual
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LG 55G2 Service Manual

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LED LCD TV
SERVICE MANUAL
CHASSIS : LA23G
MODEL : 55G2
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67366702 (1203-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
55G2-UG
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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  • Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LED LCD TV SERVICE MANUAL CHASSIS : LA23G MODEL : 55G2 55G2-UG CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67366702 (1203-REV00) Printed in Korea...
  • Page 2 SPECIFICATION ..................4 ADJUSTMENT INSTRUCTION .............. 10 SCREW ASSEMBLY WORKING GUIDE ..........19 EXPLODED VIEW .................. 20 SCHEMATIC CIRCUIT DIAGRAM .............. - 2 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Application Range

    2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : ~ 85 % - 4 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 VESA(SVGA) 1024*768 48.363 60.00 65.00 VESA(XGA) 1360*768 47.712 60.015 85.50 VESA (WXGA) Х 1920*1080 67.5 148.8 WUXGA (Reduced Blanking) - 5 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 HDTV 1080P 1920*1080 26.97 23.976 74.176 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Usb Input

    Side by Side , Top & Bottom Checkerboard 1920*1080p 33.75 30.000 74.25 Side by Side, Top & Bottom Checkerboard - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 50.35 / 50.40 Line Alternative 640*480p 31.469 / 31.50 59.94 / 60.00 50.35 / 50.40 Side by Side (Full) - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Component Input

    - Remark: 3D Input mode Side by Side Top & Bottom Checkerboard Single Frame Frame Packing Line Column Sequential Interleaving Interleaving LLLLL - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Adjustment Instruction

    ▪ USB Download(S/W Update, Option, Service only) ▪ ad 00 10 [Adjust 1024*768 RGB] ▪ ad 00 90 End adj. Ref) ADC adj. RS232C Protocol_Ver1.0 - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Manual Adjustment

    1) Connect: PCBA Jig -> RS-232C Port == PC -> RS-232C Port 4.1.6. Inspection - In INSTART menu, check these keys. - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 60 | 00 00 00 1E 26 36 80 A0 70 38 1F 40 30 20 25 00 70 | A0 5A 00 00 00 1A 00 00 00 00 00 00 00 00 00 30 - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 60 | 00 00 00 1E 26 36 80 A0 70 38 1F 40 30 20 25 00 70 | A0 5A 00 00 00 1A 00 00 00 00 00 00 00 00 00 10 - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: White Balance Adjustment

    R Gain G Gain B Gain Medium R Gain G Gain B Gain Warm R Gain G Gain B Gain - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Note that there are Wi-Fi MAC and MAC address. Wi-Fi MAC is used for wireless network and MAC address is used for wired network - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 Step 6) Check "Back Light(xxx)" on the screen, check data increase . You should change Eye Q sensor. <Step 2> <Step 3> <Step 6> <Step 4> <Step 5> - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 (2) Select "Tool Option 1" and Push “OK” button. (3) Punch in the number. (Each model has their number.) - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Optional Adjustments

    RF signal in 216 Gray pattern. (12) If ADC calibration is failure, after recheck ADC pattern or condition, retry calibration - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 Module will get damaged Module will get damaged • FAB31339201 (M3*L10, BK, Taptite) • 8EA • FAB30016122 (M4*L20, BK, Taptite) • 4EA - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN & GPIO Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 22 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN POWER 11/05/31 Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 23 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MAIN AUDIO/VIDEO THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 24 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN DDR Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 25 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 26 LG1152 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 27 2011.12.12 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 28 2011.10.19 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. HDMI Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 29 JACK HIGH / MID 2011.11.21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 30 JACK_COMMON 2011.11.21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 31 JACK_COMMON 2011.11.21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 32 IR / KEY 2011.11.21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 33 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 34 USB3_HUB_WiFi 2011.10.26 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 35 SCART GENDER 2011.10.26 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 36 MOTION REMOTE 2011.11.21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 37 LAN_VERTICAL 2011.12.09 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 38 LG1152 A0 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR ETHERNET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 39 2011.11.21 AMP_NEO ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 40 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 41 SCART AUDIO AMP 2011.11.21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 42 CI SLOT 2011.10.31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 43 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 44 TUNER 2011.11.21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 45 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 46 LVDS_HIGH_MID 2011.04.30 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 LOCAL DIMMING 2011.12.13 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 11.09.29 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 49 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. URSA5 block Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR URSA DDR3 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 52 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR URSA5 Power Block THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR IR Blaster/Boost THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 LCD TV Repair Guide `12 years New Models < Applicable Model > XXG2-UG Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 Overview for ’12 Broadband Model (Hardware) Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 Micom for Key/IR sensing Wifi Audio AMP (10W) Local Key +IR HDMI switch (4:1) Front Spk FRC IC, Motion assy DDR Memory Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 2Link AAD_DATA LG7303 HDMI HDMI1~4 Switch HSR_P/M USB1 USB2 USB3 RMII Q-Remote_R/TX Qwerty - R eMMC 128MB×1 4GB×1 256MB×4 (1600) (1600) Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 59 DDR3(x16) * 3 Host (x3) Audio PLL Audio Clocks w/ DCO 6(gbb, l9da) eMMC DDR3-PHY (3-port) Controller interrupt 3(hdmi, 3ch, gbb) Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 60 Clock Divide & Reset u_DPLL 27Mhz generation w/ test logic 200Mhz 27Mhz sclk About 220 internally generated clocks Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 61 L9 Block diagram Main SoC <ATSC> IF_AGC IFAGC ADC_I_INN/P IF N/P (B1) ATSC H/NIM I2C-CH6(Main) Tuner /TU_RESET TDSS-H151F TU_SIF TU_CVBS Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 62 DSUB_V/H SYNC [V/H SYNC] RGB_EDID RGB_EDID IC3600/ M24C02-RMN6T IC3600/ M24C02-RMN6T MICOM MICOM [EDID_WP] [EDID_WP] PC AUDIO SPDIF PC_L/R_IN SPDIF_OUT [GPIO4] [AUAD_L/R_CH5_IN] [IEC958OUT] Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 63 L9 Block diagram PC_L/R_IN MAIN 4P wafer AUD_SCK/LRCK/LRCH AV_L/R_IN NTP7500 NTP7500 I2C2_SDA/SCL 0x54 0x54 LG1152 AMP_MUTE AMP_RESET MICOM TU_SIF TR BUF SPDIF_OUT Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 64: Power Switch

    5V_HDMI_3 MICOM (IC3000 / HDMI HDMI R5F100GEAFB) TMDS Link 8bits CEC_REMOTE DDC_I2C 2bits HDMI_HPD_4 Power Switch MHL_DET 5V_HDMI_4 (IC3202 / TPS2554) Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 65 (B1) SOC_RX [UART0_RX / GPIO49] SOC_TX [UART0_TX / GPIO50] 15Pin RGB PC SOC_RX SOC_TX SOC_RX SOC_TX MICOM 4Pin debugging Wafer P3800 Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 66 SDA2/GPIO71 I2C_SDA3 R5F100GE) (B1) IR_B_RESET SD_DATA0/GPIO85 IR Blaster IRB_SPI_MISO SPI_DI0/GPIO39 Micom IR OUT IRB_SPI_MOSI SPI_DO0/GPIO38 (IC11002/ IRB_SPI_CK SPI_SCLK0/GPIO37 MC96FR3128) IRB_SPI_SS SPI_CS0/GPIO36 Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 67: Trouble Shooting - No Power

    Check LVDS Power Voltage Replace Q2305 Q2305 : 12V Check Inverter Control Check Power Board or Module P2301 18 pin : High Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 68 Replace Capacitor. C116, C117 Check L9 Ace (IC101) Chip Replace IC101 Check L9 D-chip (IC100) Chip Replace IC100 or Main Board. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 69 Replace Resistor or Capacitor. R571, C549 Check L9 Ace (IC101) Chip Replace IC101 Check L9 D-chip (IC100) Chip Replace IC100 or Main Board. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 70 AV1_CVBS_DET : R3810 Replace LG1152A(IC101) Check L9 Ace(IC101) Chip or Main Board. Replace IC100 or Main Board. Check L9 D-chip (IC100) Chip Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 71 Check COMP1_DET Signal Replace R3806 or Jack Check L9 Ace(IC101) Chip Replace IC101 Check L9 D-chip (IC100) Chip Replace IC100 or Main Board Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 72 Check DSUB_DET Replace R3646 Replace IC101 Check L9 Ace (IC101) Chip Replace IC100 or Main Board. Check L9 D-chip (IC100) Chip Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 73 HDMI Switch (IC3201) Check L9 Ace (IC101) Replace IC 101 Check L9 D-chip (IC100) Replace IC 100 or Main Board. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 74 P5400 :1, 2, 3, 4 pin IC5400 Replace connector Check Connector & P5400 If found to be damaged. Check speaker resistance and connector damage. Replace speaker. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 75 Replace L6500 Check DIF_P/N Signal Bad Tuner. Replace Tuner. TU6504 10,11 Pin Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 76 TU6504 6Pin Check TU_SIF path Replace TR Including Q6500 TR buffer to LG1152A(IC101) Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 77 L506 , L509 Check PC_L , PC_R path Replace component Including L506,L509 to LG1152A(IC101) Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 78 12. Trouble shooting - No audio (SPDIF) Check SPDIF Cable Check R630 , C630 , C3615 Check JK3602 VCC PIN Replace LG1152D(IC100) SPDIF_OUT Signal(3.3V) SPDIF Replace JK3602 Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 79 - USB power could be disabled by inrushing current - In this case, remove the device and try to reboot the TV (AC power off/on) Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 80 R 5206 / R 5207 / R 108 / R 106 R 106 Check L9-D chip IC 100 Replace IC 100 or Main Board Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 81: Reference File

    Check the Tool Option 7 Correct the Tool Option7 ( using reference file ( GP4_L9_TOOL OPTION)) Reference file : GP4_L9_Tool option Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 82 16. Trouble shooting - SW download The latest S/W put in the ‘LG DTV’ folder of USB Memory USB connects to USB jack for service. If SW update screen appears, push the OK button. The SW update is finished, please check new SW version by in-start menu.
  • Page 83 Interconnection - PCBs XXG2-UG [PCBs] Main PCB Soft Touch + IR PCB RF Motion ASSY Wi-Fi ASSY T-CON ASSY Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 84 Soft Touch + IR PCB WIFI ASSY SPK unit RF MOTION ASSY Soft Touch + RF MOTION ASSY WIFI ASSY IR PCB To Main Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 85 Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GCSC System for these model. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 86 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 87 Power Board No Video/ replace voltage? No audio ( 3.5V,12V,20V or MAIN B/D 24V…) Replace Power Board and repair parts Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 88 2. Install Booster S/W Upgrade Normal Contact with signal distributor Picture? or broadcaster (Cable or Air) Normal Picture? Replace Main B/D Close Close Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 89 Request repair for external device/cable RGB/ Check external External device device and Replace Main B/D HDMI/DVI /Cable error cable normal Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 90 (Check normal operation of Main B/D normal? External Input, Component, HDMI/ RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 91: Power Error

    Measure voltage of each output of Power B/D Normal? ※ Normal Replace Main B/D voltage? Close Normal Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 92 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 93: Audio Error

    Screen normal voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board disconnection Replace Speaker Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 94 Connect and check Normal Input signal error) other external device audio? Check and fix external device Check and fix external device Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 95: Function Error

    (Power B/D don’t have problem) Close If R/C operate, Normal Explain the customer operating? cause is interference from light in room. Replace R/C Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 96 * If you conduct the loop at 3times, change the Qwerty Remote. * INSTART MENU 15.RF Remocon Test 3. Firmware download Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 97 Main B/D ☞A29 Close Check & Repair Wi-Fi cable connection ☞A7 Wi-Fi Mac value Close is “NG”? Change the Wi-Fi Assy Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 98 - S/W Version RGB,HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 99 ※ Describe the basis of the description in (For models without any fix information, provide “Part related to nose” in the Owner’s Manual. the description) Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 100 Zoom part with Replace module exterior damage damage Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand dent Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 101 Exchange LED driver Board (PSU) A-3/5 Inverter/ Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Continue to the next page Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 102 Remote controller operation checking method D. Function error Motion Remote operation checking method Wifi operation checking method E. Etc Tool option changing method Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 103 After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 104 2011. 12 .14 symptom date LCD TV Revised Content LED driver B+ 24V measuring method date Check the DC 24V and Inverter on Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 105 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re- enter the value after replacing the MAIN BOARD. enter the value after replacing the MAIN BOARD. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 106 (Power Board ↔ Main Board) - 공통 SMAW200-H24S (YEONHO) Power on 3.5V 3.5V 3.5V 3.5V V-sync DRV_ON PWM Dim #1 PWM Dim #2 Error-out Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 107 <ALL MODELS> When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Menu Settings Channel settings Manual Tuning Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 108 <ALL MODELS> 1. Checking method for remote controller for adjustment Version Press the IN-START with the remote controller for adjustment Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 109 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 110 LCD TV connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 111 Check Link Cable (LVDS) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 112 Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..) 4.Video error (Classification of MODULE or Main-B/D!) Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 113 LCD TV Revised Content Check front display LED date <XXG2-UG> ST-BY condition: Red or Turn Off Power ON condition: Turn Off Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 114 (Power Board ↔ Main Board) - 공통 SMAW200-H24S (YEONHO) Power on 3.5V 3.5V 3.5V 3.5V V-sync DRV_ON PWM Dim #1 PWM Dim #2 Error-out Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 115 (Power Board ↔ Main Board) - 공통 SMAW200-H24S (YEONHO) Power on 3.5V 3.5V 3.5V 3.5V V-sync DRV_ON PWM Dim #1 PWM Dim #2 Error-out Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 116 Entry method 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 117: Checking Method

    2. Select the Settings -> Picture & Sound -> Sound adjustment -> Sound setting 3. Select TV Speaker from Off to On Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 118 ③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 119 4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 120 Checking order 1, 2. Check Motion cable condition between Motion assy & Main board. Check the 3.3V on the terminal 1. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 121 Checking order 1, 2. Check Wifi cable condition between Wifi assy & Main board. Check the 5V on the terminal 1. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 122 Changing method Contact the USB memory. (USB 1,2,3 jack) Enter the password. (ex. 000000) * Access USB Memory has each password. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

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