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LG 50GA6400 Service Manual
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LG 50GA6400 Service Manual

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Download this manual See also: Owner's Manual
LED TV
SERVICE MANUAL
CHASSIS : LA37G
MODEL : 50GA6400
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67657904 (1302-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
50GA6400-UD
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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Summary of Contents for LG 50GA6400

  • 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 TV SERVICE MANUAL CHASSIS : LA37G MODEL : 50GA6400 50GA6400-UD CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67657904 (1302-REV00) Printed in Korea...
  • Page 2 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION .............. 11 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: Servicing Precautions

    - 4 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. - 5 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : ~ 85 % - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 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 - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 Side by Side , Top & Bottom Checkerboard 1920*1080p 33.75 30.000 74.25 Side by Side, Top & Bottom Checkerboard - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 50.35 / 50.40 Line Alternative 640*480p 31.469 / 31.50 59.94 / 60.00 50.35 / 50.40 Side by Side (Full) - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 - Remark: 3D Input mode Side by Side Top & Bottom Checkerboard Single Frame Frame Packing Line Column Sequential Interleaving Interleaving LLLLL - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: 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 - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 1) US, Canada models (12Y LCD TV + MAC + Widevine + ESN + Google CA Key) 4.1.6. Inspection - In INSTART menu, check these keys. - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 60 | 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC 70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 42 - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 60 | 00 A0 5A 00 00 00 1E 26 36 80 A0 70 38 1F 40 30 70 | 20 25 00 A0 5A 00 00 00 1A 00 00 00 00 00 00 AA - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 - In case of LCD, Back-light on should be checked using no Medium R Gain signal or Full-white pattern. G Gain B Gain Warm R Gain G Gain B Gain - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Color Temperature

    - In case of LCD, Back-light on should be checked using no (Min) signal or Full-white pattern. 6-10 11-20 21-30 31-40 41-50 51-80 81-119 Over 120 - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 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 - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 (2) Select "Tool Option 1" and Push “OK” button. (3) Punch in the number. (Each model has their number.) - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 RF signal in 216 Gray pattern. (12) If ADC calibration is failure, after recheck ADC pattern or condition, retry calibration - 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 ⓒ 2013 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 ⓒ 2013 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 ⓒ 2013 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 ⓒ 2013 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 ⓒ 2013 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 ⓒ 2013 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 ⓒ 2013 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 29 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 30 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 31 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 32 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 33 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 34 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 35 LG1152 A0 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR ETHERNET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 36 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 37 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 38 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 39 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 40 TUNER 2012.03.08 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 41 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 42 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 43 LOCAL DIMMING 2012.02.22 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 44 11.09.29 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 45 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. URSA5 block Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 46 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR URSA DDR3 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR URSA5 Power Block THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR IR Blaster/Boost THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 LCD TV Repair Guide `13 years New Models < Applicable Model > XXGA6400-UD XXGA7900-UA Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 Overview for ’13 Broadband Model (Hardware) Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 52 Wifi + Motion assy Audio AMP (10W) Front Spk HDMI switch (4:1) Local Key + IR FRC IC, + LOGO DDR Memory Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53 2Link AAD_DATA LG7303 HDMI HDMI1~4 Switch HSR_P/M USB1 USB2 USB3 RMII Q-Remote_R/TX Qwerty - R eMMC 128MB×1 8GB×1 256MB×4 (1600) (1600) Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 54 DDR3(x16) * 3 Host (x3) Audio Clocks Audio PLL w/ DCO 6(gbb, l9da) eMMC DDR3-PHY (3-port) Controller interrupt 3(hdmi, 3ch, gbb) Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 Clock Divide & Reset u_DPLL 27Mhz generation w/ test logic 200Mhz 27Mhz sclk About 220 internally generated clocks Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 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-H651F TU_SIF TU_CVBS Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 Phone JACK _Yellow AV1_CVBS_IN [CVBS_IN4] AV1_CVBS_DET AV1_CVBS_DET [SPI_DI1/GPIO35] Component 1 COMP1_Y/Pb/Pr Phone JACK _Green [Y2/PB2/PR2_IN] COMP1_DET COMP1_DET [GPIO18] SPDIF SPDIF_OUT [GPIO4] [IEC958OUT] Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 L9 Block diagram MAIN 4P wafer AUD_SCK/LRCK/LRCH AV_L/R_IN COMP_L/R_IN NTP7500 NTP7500 I2C2_SDA/SCL 0x54 0x54 LG1152 AMP_MUTE AMP_RESET MICOM TU_SIF TR BUF SPDIF_OUT Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 59 DDC_I2C 2bits 5V_HDMI_3 MICOM (IC3000 / HDMI HDMI R5F100GEAFB) TMDS Link 8bits DDC_I2C 2bits HDMI_HPD_4 Power Switch MHL_DET (IC3202 / 5V_HDMI_4 TPS2554) Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 60 [USB_DM2 / DP2] USB3 USB_DM2 / DP2 USB2 USB_HUB_IC_IN_DP / DM [USB_DM1 / DP1] USB HUB USB_DM1 / DP1 USB1 (B1) Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 61 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 62 Check LVDS Power Voltage Replace Q2305 Q2305 : 12V Check Inverter Control Check Power Board or Module P2301 2 pin : High Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 63 Replace Capacitor. C116, C117 Check L9 Ace (IC101) Chip Replace IC101 Check L9 D-chip (IC100) Chip Replace IC100 or Main Board. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 64 Replace Resistor or Capacitor. R571, C549 Replace IC101 Check L9 Ace (IC101) Chip Check L9 D-chip (IC100) Chip Replace IC100 or Main Board. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 65 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 66 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 67 HDMI Switch (IC3201) Check L9 Ace (IC101) Replace IC 101 Check L9 D-chip (IC100) Replace IC 100 or Main Board. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 68 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 69 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 70 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 71 Check AV1_L , AV1_R path Replace component NENT Including L508,L511 to LG1152A(IC101) Follow procedure ‘8. All source audio’ trouble shooting guide. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 72 11. 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 73 - 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 74 R 5206 / R 5207 / R 108 / R 106 R 106 Check L9-D chip IC 100 Replace IC 100 or Main Board Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 75 Correct the Tool Option5 Check the Tool Option 6 Correct the Tool Option6 Check the Tool Option 7 Correct the Tool Option7 Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 76 15. 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 77 Interconnection - PCBs XXGA6400-UD [PCBs] Main PCB LOGO + IR PCB RF Motion ASSY Wi-Fi ASSY Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 78 Interconnection – sub PCB( XXGA6400-UD Series ) SPK unit LOGO + IR PCB LOGO + KEY + RF MOTION ASSY WIFI ASSY IR PCB To Main Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 79 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 80 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 81 Power Board No Video/ replace voltage? No audio ( 3.5V,12V,20V or MAIN B/D 24V…) Replace Power Board and repair parts Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 82 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 83 Request repair for external device/cable RGB/ Check external External device HDMI/DVI device and /Cable Replace Main B/D error cable normal Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 84 (Check normal operation of normal? Main B/D External Input, Component, HDMI/ RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 85 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 86 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 87 Screen normal voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board disconnection Replace Speaker Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 88 Connect and check Normal Input signal error) other external device audio? Check and fix external device Check and fix external device Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 89 (Power B/D don’t have problem) Close If R/C operate, Normal operating? Explain the customer cause is interference from light in room. Replace R/C Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 90 * If you conduct the loop at 3times, change the Qwerty Remote. * INSTART MENU 15.RF Remocon Test 3. Firmware download Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 91 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 92 - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 93 ※ 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 94 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand dent Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 95 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 96 Remote controller operation checking method D. Function error Motion Remote operation checking method Wifi operation checking method E. Etc Tool option changing method Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 97 After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 98 2011. 12 .14 symptom LCD TV date Revised Content LED driver B+ 24V measuring method date Check the DC 24V and Inverter on Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 99 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 100 Revised Content Power Board voltage measuring method date Check the DC 24V, 12V, 3.5V. GA6400 : 18P GA7900 : 24P Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 101 <ALL MODELS> When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Menu Settings Channel settings Manual Tuning Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 102 <ALL MODELS> 1. Checking method for remote controller for adjustment Version Press the IN-START with the remote controller for adjustment Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 103 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 104 LCD TV connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 105 Check Link Cable (LVDS) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 106 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 107 Revised Content Check front display LED date <GA64/7900> ST-BY condition: White or Turn Off Power ON condition: White or Turn Off Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 108 Check power input voltage and ST-BY 3.5V date <GA64/7900> Check the DC 24V, 12V, 3.5V. GA6400 : 18P GA7900 : 24P Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 109 Content Checking method when power is ON date <GA64/7900> Check “power on” pin is high GA6400 : 18P GA7900 : 24P Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 110 Entry method 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 111 2. Select the Settings -> Picture & Sound -> Sound adjustment -> Sound setting 3. Select TV Speaker from Off to On Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 112 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 113 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 ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 114 Checking order 1, 2. Check Motion cable condition between Motion assy & Main board. Check the 3.3V on the terminal 1. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 115 Checking order 1, 2. Check Wifi cable condition between Wifi assy & Main board. Check the 3.3V on the terminal 1. Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 116 DDR3_1Gb LG1152A Composite L9 B0 Component SPDIF_OUT SPDIF OUT Qwerty-remote UART LG1152D Tuner Ethernet phy Ethernet L9 B0 H/NIM RTL8201F-VB-CG Wi-Fi Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 117 TUNER TU_RESET LG1152D I2C_SCL L9 B0 Tuner I2C_SDA H/NIM LG1152A IF_AGC L9 B0 IF_±, TUNER_SIF, TU_CVBS Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 118 AV_L/R_IN AV_CVBS_DET COMP_Y/Pb/Pr HDMI COMP_DET EEPROM LG1152A Switch 24C02 L9 B0 IF± Tuner ATSC H/NIM CVBS LG1152D SPDIF_OUT SPDIF L9 B0 Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 119 L9 B0 IR Receiver Main Micom Renesas IR Blaster 3.5pi SPI_CLK/SS /MOSI IR Out Micom MISO Abov [SD_DATA0] D/L 4Pin Wafer Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 120 [EXT_INTR0] [EB_CS1/GPIO79] USB_CTL3 USB_WIFI LG1152D Wi-Fi WIFI_DM/ DP [BT_USB_DM] L9 B0 [BT_USB_DP] M_REMOTE_RX [UART1_RX/GPIO61] M_REMOTE_TX Bluetooth [UART1_TX/GPIO62] M_RFModule_RESET [GPIO13] M_REMOTE_ISP [GPIO15] Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 121 L9 B0 HDMI_HPD_3 TMDS HDMI3 HDMI3 DDC_I2C 5V_HDMI_3 HDMI_HPD_4 LG1152D TMDS L9 B0 Micom HDMI4 HDMI4 DDC_I2C Renesas 5V_HDMI_4 X-tal 32.768kHz Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 122 L9 B0 LG1152A L9 B0 AMP_MUTE AMP_RESET TU_SIF TR BUF [AAD_ADC_SIF] MICOM LG1152A SPDIF_OUT_ARC [ARC0] L9 B0 SPDIF_OUT [IEC958OUT] LG1152D L9 B0 Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 123 L9 B0 TPS65178 SII9587CNUC NVRAM (PMIC, GA79) IC102 R1EX24256BSAS0A LGE5822 (T-CON, GA79) SCL1/GPIO58 +3.3V_Normal SDA1/GPIO57 MICOM SCL2/GPIO56 I2C_SCL3 IC3000 SDA2/GPIO71 I2C_SDA3 T-R5F100GDAFB Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 124 Scaler(sub) 2Dto3D PQ(R) LVDS TX (HS) L9-3D MIXED IPs (Bus) Left PQ(L) LVDS TX (HS) L9-3D NR(R) NR(L) PRE3D Line out Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 125 $0.055 Tol. 20% 400mA Wi-Fi $0.044 0.4A USB1 DC-DC HDD Only 1.8A $0.055 $0.145 Tol. 10% * DC-DC 효율 미 고려 Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 126 (2 Ch) USB2.0x3 HDMI1 HDMI2 HDMI AAD_DATA RMII HDMI (1 Ch) Ethernet HDMI3 HDMI4 TXA/B 51Pin LVDS HSR_P/M Keypad MICOM Qwerty-Remote_R/TX Qwerty-R Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 127 DDR3 Controller DDR3 Controller (x2) Micom SDIO CPU PLL DDR3 PHY DDR3 PHY DDR3 PHY RMII USB2.0x3 DDR3 DDR3 DDR3 eMMC Copyright ⓒ 2013 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

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