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LG 32LB520B Service Manual
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LG 32LB520B Service Manual

Chassis : 6m62n
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See also: Owner's Manual
LED TV
SERVICE MANUAL
CHASSIS : 6M62N
MODEL: 32LB520B
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
US/Canada/Mexico
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 32LB520B

  • Page 1 Internal Use Only US/Canada/Mexico http://aic.lgservice.com http://eic.lgservice.com http://biz.lgservice.com LED TV SERVICE MANUAL CHASSIS : 6M62N MODEL: 32LB520B CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Printed in Korea...

  • Page 2: Table Of Contents

    ....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: Specification

    Y/Cb/Cr, Y/Pb/Pr HDMI: DTV/DVI HDMI Input Support HDCP SPDIF out SPDIF out USB Input Music :MP3; Photo: JPEG Headphone - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 FHD only(Support to HDMI-PC) 60.015 85.5 VESA(WXGA) 1360*768 @60Hz 47.712 WUXGA 60.0 148.5 1920*1080 @60Hz 67.5 FHD only(Support to HDMI-PC) (Reduced blanking) - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Adjustment Instruction

    1. Connect your PC to TV set with USB debug cable. 2. Turn on the TV set, then open the HDCP operating tool “MStar IS P Utility V4.5.7 Alpha”. - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 * Display and Sound check is executed by Remote control. <Caution> Not to push the "RESTORE" key after completion if the function inspection. - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 2. Connect HDMI port and input 80% full white signal. 3 Calibrate the color analyzer (CA310). Positioning Ring 4 Open W/B auto adjust system and load saved parameters. - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 192 (default data) and decrease the others. (8) When adjustment is completed, exit adjustment mode using EXIT key on Remote control. - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 - If Test is failed, Buzzer operates. - If Test is passed, GOOD Lamp on and move to next process automatically. - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Schematic Circuit Diagram

    SCHEMATIC CIRCUIT DIAGRAM Connetor Inverter controller 5V Standby Power(option) 3A +5V_Standby BL-ON/OFF +12V_PWR AOZ3015PI/SOP8 +5V_Normal BL-ON/OFF BL-ADJUST BL-ADJUST 22uH_3A R1 100K/0402/5% 4.7K/0402/5% R3 27K/0402/5% 200R/0402/5%/NC COMP +12V_PWR +12V 51K/0402/1% BL-ON/OFF PGND 1nF/0402/16V/NC 100R/0402/5% 0.1uF/0402/16V 0.1uF/0402/16V/NC 0.1uF/0402/16V VBL_CTRL 470uF/16V/EC3.5 3904/SOT-23 10K/0402/5% 10uF/16V/0805 20K/0402/5% 0.1uF/0402/16V...
  • Page 15 HDMI Interface VDDC 1.15V HDMI0-RX0P HDMI0-RX0P HDMI0-RX0N HDMI0-RX0N HDMI0-RX1P HDMI0-RX1P VDDC HDMI0-RX1N HDMI0-RX1N HDMI0-RX2P HDMI0-RX2P HDMI0-RX2N HDMI0-RX2N HDMI0-CLKN HDMI0-CLKN HDMI0-CLKP HDMI0-CLKP HDMI0-SCL 0.1uF/0402/16V 0.1uF/0402/16V HDMI0-SCL HDMI0-SDA 2.2uF/0603/16V 0.1uF/0402/16V 0.1uF/0402/16V HDMI0-SDA HDMI0-HPDIN HDMI0-HPDIN HDMI1-RX0P HDMI1-RX0P HDMI1-RX0N HDMI1-RX0N HDMI1-RX1P HDMI1-RX1P HDMI1-RX1N HDMI1-RX1N HDMI1-RX2P HDMI1-RX2P DDR2 1.8V...
  • Page 16 LVDS CONNECTOR ( 1 DIP + 2 SMT OPTIONAL ) HI CONNECTOR Power for panel 0R/1206/5%/NC VPANEL_IN +5V_Normal VCC-Panel 9435/SOP8 0R/1206/5% +12V_NORMAL CA11 DIP/20*2 0.1uF/0402/16V/NC 100K/0402/5% AO3401A/SOT-23/NC 470uF/16V/EC3.5 1uF/0402/16V/NC R7_RXO0- R6_RXO0+ 0.1uF/0402/16V/NC R5_RXO1- R4_RXO1+ R3_RXO2- R2_RXO2+ 100K/0402/5% R1_RXOC- R0_RXOC+ G7_RXO3- G6_RXO3+ PANEL_ON/OFF PANEL_ON/OFF...
  • Page 17 AUDIO IN VIDEO OUT HD_L HD_R CVBS1_OUT HD_L 10K/0402/5% WHITE AV1-Lin HD_R 10K/0402/5% AV1-Rin RCA-2P 12K/0402/5% 12K/0402/5% 220pF/0402/16V/NC 220pF/0402/16V/NC FOR ATV/AV DEBUG SPDIF OUT YPBPR & AV IN 330R/0402/5% SPDIF_O SPDIF_OUT C102 33pF/0402/16V 100R/0402/5% Closed to IC YPbPr_PR YPbPr_PB R199 SPDIF_O INPUT 0R/0402/5%...
  • Page 18 VGA AUDIO IN VGA-Rin VGA-Gin VGA-Bin PHONEJACK 10K/0402/5% VGA-Lin_AU VGA-Lin_AU 10K/0402/5% VGA-Rin_AU VGA-Rin_AU VGA/15 PIN 12K/0402/5% 220p/0402/16V DDC_SCL_D UART_RX 12K/0402/5% DDC_SDA_D UART_TX 220p/0402/16V 100R/0402/5% VGA_VSYNC 100R/0402/5% VGA_HSYNC 10K/0402/5% 10K/0402/5% VGA-Bin VGA-Bin VGA-Gin VGA-Gin VGA-Rin VGA-Rin 75R/0402/5% 75R/0402/5% 75R/0402/5% Close to Mstar IC Title Title Title...
  • Page 19 USB INTERFACE USB POWER USB_A +5V_USB0 5V_USB +5V_Normal USB1_D1-_in USB1_D- 2.2/0402/5% USB1_D- USB1_D1+_in USB1_D+ 2.2/0402/5% USB1_D+ +5V_USB0 5V_USB 2.2uF/0603/16V 0.1uF/0402/16V USB_A +5V_USB0 USB2_D1-_in 2.2R USB2_D- +5V_USB0 5V_USB USB2_D- USB2_D1+_in R100 2.2R USB2_D+ USB2_D+ CA10 200uF/35V/ECS-5M 2.2uF/0603/16V 0.1uF/0402/16V Title Title Title MSD3393 MSD3393 MSD3393...
  • Page 20 HDMI3/5V HDMI3/5V HDMI3_RX2P R101 5.1R/0402/5% HDMI3-RX2P R102 HDMI3/5V HDMI0-RX2P R106 CEC/DDC GND HDMI3-DDC-SCL HDMI3_RX2N R103 5.1R/0402/5% HDMI3-RX2N R104 R105 DDC SCL HDMI0-RX2N HDMI3-DDC-SDA HDMI3_RX1P R107 5.1R/0402/5% HDMI3-RX1P HDMI0-RX1P DDC SDA 10K/0402/5% 1K/0402/5% HDMI3-HPD HDMI3_RX1N R108 5.1R/0402/5% HDMI3-RX1N HDMI3-HPD HDMI0-RX1N HDMI3_RX0P R109 5.1R/0402/5% HDMI3-RX0P...
  • Page 21 Silicon TUNER +3.3V_TU +3.3V_TU +3.3V_TU R153 100R/0402/5%/NC 600R/0402/500mA 47nF/0402/16V/NC R205 0.1uF/0402/16V/NC 24 MHz /ESR< 120 , CL=8pF 3.3R/0402/1% 2158 FOR LOW SINGER WATER WAVE 22pF/0402/16V 2157 CAN CANCLE 22pF/0402/16V C180 C181 3906 +1.8V_TU close 20pin C100 C177 C178 C179 120pF/0402/50V/NC 24MHz 68pF/0402/16V PE42750DS/NC...
  • Page 22 +12V_NORMAL TPA3110 VCC-AMP AUDIO OP AU. AMP +12V_NORMAL 0.1uF/0402/16V 22uH/2.7A C135 C163 R167 C164 R169 R166 150R/0402/5% 100K/0402/5% 1uF/0603/16V LINEOUT_APML C137 1N4148/SMD223 100K/0402/5% +5V_Normal R172 1K/0402/5% 220nF/0805/50V 47nF/0603/16V MUTE_AMP PVCCL PVCCL BH3544F/SOIC8 C138 R171 C143 EARPHONE_JACK_R OP_VCC1 2.2nF/0402/50V/NC 47K/0402/5% 220nF/0603/50V 22uH/2.7A FAULT PVCCL...
  • Page 23 RP29 100/0.25W RPA29 100/0.25W CP12 FUSE T2A 250VAC 471/1KV RP28 392/630V 100K 2W CY104 +24V RL256 DP11 +24V_Normal RL256 471/400VAC CP15 DPA8 CP19 CP14 RP42 ZD301 5397 1000U 35V 1.5K/2W 1000U 35V 68U 450V 68U 450V SB10200 5397 RL256 RL256 Aging socket RP41 CNV24...
  • Page 24 CP36 471/1KV RP44 100/0.25W +24V_Normal DP15 100uH +24V LED+ ZDP12 LED+ RP45 CN400 CP35 CN10_2.0 471/1KV +12V RP54 RP39 100/0.25W CP33 CP37 LED1 LEDB1 82UF/100V LED2 ISENSE CP34 CP26 82UF/100V LEDB2 DP12 LED3 RP52 2.2uF RP46 104/100V RP47 LEDB3 LED4 BL-ON/OFF 4148 2R2/0805...
  • Page 26 L14 Repair Process Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 27 F. Exterior error Exterior defect * First of all, Check whether there is SVC Bulletin in GCSC System for these model. Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 28 Exchange LED driver Board (PSU) A-3/5 Inverter/ Module A-4/5   Exchange Module itself (1) A-5/5   Exchange Module itself (2) Continue to the next page Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 29 Voltage and speaker checking method in audio/discontinuation case of audio error D. Function error_ No response in Remote controller operation checking method remote controller, key error Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 30 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 31 No audio Voltage board(+12V, 5V, +24V, 3.3V) MAIN B/D Replace Power Board and repair parts Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 32 1. Reconnection Picture Bulletin Picture 2. Install Booster Normal Contact with signal distributor S/W Upgrade change Picture or broadcaster (Cable or Air) Normal Picture Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 33 (DiSEqC, motor, etc…) Contact with signal Change satellite setting S/W Upgrade distributor (match with installed ANT) or broadcaster (Cable or Air) Normal Normal Picture Picture Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 34 Normal main board error cable Request repair for external device/cable Check external External HDMI device and Replace Main B/D device/Cable error cable Normal Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 35 Screen (Check normal operation of External Input, HDMI Screen Replace error Component, HDMI by normal Main B/D connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 36 Voltage Voltage board and ST-BY 5V or main board from main board Repair power circuit or Replace power board replace main board or main board Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 37 "POWEROFF_UNKNOWN" 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 © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 38 Cancel OFF Replace main board or amplifier Check mute control circuit normal it should be high Check Disconn Speaker Replace MAIN Board ection disconnection Replace Speaker Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 39 Normal Request repair to external Audio cable/ANT provider (In case of External Input Check and fix external device signal error) Check and fix external device Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 40 IR SERSOR Normal If R/C operate, Operating Explain the customer cause is interference from light in room. Replace R/C Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 41 - S/W Version Fix in accordance HDMI, Chec x i f Recognition error BURNING HDCP with technical external device/cable information E nd Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 42 “Part related to nose” in the Owner’s Manual. as shown in the solution manual (For models without any fix information, provide the description) Copyright © 2014 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Controller Replace remote controller damage Stand Replace stand damage Copyright © 2014 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 Check back light On with naked eye date -> disjoint back case ->check lighting at 2 points or other screws hole. Power On Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 45 1. Measure DC 24V applying to inverter PCB from Power Board. 2. Output 24V from Power Board supply to inverter PCB. Check Pin contacting statement and connection statement. Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 46 LED TV Revised Content Main Board voltage measuring method date Check main 5V,3.3V , V_CORE(1.15),DDR_1.8V 3.3V DDR_1.8V V_CORE(1.15V) MAIN_5V Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 Content date (MENU-CHANNEL-MANUAL TUNING) Signal quality: Normal:over 50%) When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 HD STB / DVD / PC / Digital Audio DVI to HDMI System As the part connecting to the external input, check the screen condition by signal Copyright © 2014 LG Electronics. Inc. All rights reserved. LGE Internal Use Only60 Only for training and service purposes...
  • Page 49 Check and replace Link Cable (LVDS) and contact condition A8/A9 date 1. Check and replace LVDS Cable. 2. Check LVDS connection condition. Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 T-Con Defect, CNT Broken Abnormal Power Section Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 51 Appendix : Exchange T-Con Board (2) Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 52 Panel Mura, Light leakage Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 53 Gate TAB IC Defect Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 54 Press “Input + 3195”, then enter into factory mode, select “System Setting” item, enter into next page, select “Test Pattern” to switch different color pattern. Blue pattern Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 Established Error B. Power error_No power 2014.07.07 date symptom LED TV Revised Content Check front display LED date ST-BY Condition: Red Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 LED TV Revised Content Check power input voltage and ST-BY 5V date Check “5VS (CA3)” pin is high (about 5.0V) Copyright © 2014 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 LED TV Revised Content Check methond when power is ON date Check “STB (R19)” pin is high (about 3.0V) Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 1. Press the MENU button on the remote controller. 2. Select the AUDIO function of the MENU. 3. Select TV speaker and check its state. Copyright © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 59 2. 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 © 2014 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 60 Block Diagram System Block Diagram PANEL CN400 EN25Q32 P7 USB1 GPIO 1 SPI FLASH LVDS INTERFACE CONTROL       SIGNAL POWER P6 USB2 DIGITAL   VIDEO SIGNAL 24MHZ CRYSTAL P8 HDMI1 DIGITAL  AUDIO SIGNAL ANALOG   VIDEO SIGNAL TUNER ANALOG   AUDIO  SIGNAL HDMI AUDIO MSD3393LU INTERFACE OUTPUT ANALOG VIDEO INPUT AUDIO INPUT SPDIF P10 HDMI2 TPA3110 SI2157...
  • Page 61 Power Tree RX1N_B SAR1 RX1N_B SAR1 RX1P_B SAR0 RX1P_B SAR0 RX2N_B AVDD_MOD RX2N_B AVDD_MOD RX2P_B DP_P1 RX2P_B DP_P1 AVDD_MOD DM_P1 AVDD_MOD DM_P1 RXCN_A DP_P0 RXCN_A DP_P0 RXCP_A DM_P0 RXCP_A DM_P0 RX0N_A RESET RX0N_A RESET RX0P_A INT/GPIO64 RX0P_A INT/GPIO64 RX1N_A IRIN RX1N_A IRIN RX1P_A...
  • Page 62 Wire Block DRIVER PANEL LVDS CN400 CN101 POWER BOARD POWER SOCKET MAIN BOARD KEY PAD IR BOARD CON2...