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LG 32LH500B Service Manual
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LG 32LH500B Service Manual

LG 32LH500B Service Manual

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LED TV
SERVICE MANUAL
MODEL : 32LH500B/32LH500D
43LH5000/43LH500T
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG 32LH500B

  • Page 1 LED TV SERVICE MANUAL MODEL : 32LH500B/32LH500D 43LH5000/43LH500T CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2 CONTENTS CONTENTS …………………………………………………………………..2 SAFETY PRECAUTIONS……………………………………………………..3 SERVICING PRECAUTIONS…………………………………………………4 SPECIFICATION………………………………………………………………..6 ADJUSTMENT INSTRUCTION………………………………………………8 BLOCK DIAGRAM……………………………………………………………10 EXPLODED VIEW…………………………………………………………….12 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 -...
  • Page 3 SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by the Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards.
  • Page 4 SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or expo- NOTE: If unforeseen circumstances create conflict between the sure of the assembly.
  • Page 5 IC Remove/Replacement 3. Solder the connections. Some chassis circuit boards have slotted holes (oblong) through CAUTION: Maintain original spacing between the replaced which the IC leads are inserted and then bent flat against the cir- component and adjacent components and the circuit board to cuit foil.
  • Page 6 1. Application range 3. Test method This specification is applied to the LED TV used 1) Performance: LGE TV test method followed 32LH500B-43LH5000(SA) and 2) Demanded other specification - Safety : IEC 60065 Ed.7 or Ed.8(TBD), QR Code(SEC), 32LH500D-43LH500T(AP-MEA) Model...
  • Page 7 Component Video Input (Y, C Resolution H-freq(kHz) V-freq.(Hz) 15.73 59.94 720(1440)*480i 15.73 60.00 31.47 59.94 720*480p 31.50 60.00 720(1440)*576i 15.63 50.00 720*576p 31.25 50.00 44.96 59.94 1280*720p 45.00 60.00 37.50 50.00 33.72 59.94 1920*1080i 33.75 60.00 28.13 50.00 67.43 59.94 1920*1080p 67.50 60.00...
  • Page 8 ADJUSTMENT INSTRUCTION [1] ADC Adjustment and White Balance Adjustment (a) ADC not adjustment. (b) White Balance Adjustment. Click “menu（SETTINGS）+1+9+9+9+ Back (Q.VIEW)” Enter the factory mode ,As shown in figure: select menu Source: choose ATV Source; select W/B pattern; change 80IRE white picture; mp of different color temperature;...
  • Page 9 [2] SOFTWARE UPGRADE PROCEDURE Step 1: Ready for F/W Upgrade 1.1 Prepare a FAT 32 format USB memory . 1.2 Copy the software(*.bin file) to USB flash disk(root directory). Step 2: F/W Upgrade 2.1 Plug the USB memory on the USB port. 2.2 Automatically detecting update file in USB Stick 2.3 Press YES, Updating is starting.
  • Page 10 BLOCK DIAGRAM 1. MAIN...
  • Page 11 2. Main board Power tree +16V_AUD U601 TAS5729MD +16V_AUD For Audio Am plifier +16V U704 SY8104ADC +12V Q708 AO4449 -7A PANEL LVDS Pow er U703 SY8104ADC +3V3SB +5VSB U705 M5723B-33F61U U401 MSD8120PBM For MSD8120PBM U410 G690H293T73 For Reset IC U403 MX25L3206EM2I-12G For SPI Flash VCCK U705 M5723B-33F61U...
  • Page 12 EXPLODED VIEW 32LH500B/32LH500D/32LH501C / -C Suffix...
  • Page 13 EXPLODED VIEW 32LH500B/32LH500D/32LH501C / -S Suffix...
  • Page 15 43LH5000/43LH500T/43LH501C / - S Suffix...
  • Page 17 Contents of LCD TV Standard Repair Process Error symptom (High category) Error symptom (Mid category) Page Remarks No video/Normal audio No video/No audio Tuning fail Video error Color error Vertical/Horizontal bar, residual image, light spot, external device color error No power Power error Off when on, off while viewing, power auto on/off...
  • Page 18 Contents of LCD TV Standard Repair Process Detail Technical Manual Error symptom Content Page Remarks Backlight converter measuring method Video error_ No video/Normal audio Main Board voltage measuring method LCD TV connection diagram Check Link Cable (LVDS) Video error_Color error reconnection condition Check test pattern Video error_Vertical/Horizontal...
  • Page 19 Contents of LCD TV Standard Repair Process Detail Technical Manual Continued from previous page Error symptom Content Page Remarks Check front display LED Check power input voltage and ST-BY 5V Power error_No power Checking method when power is ON Power board and main board voltage measuring method Audio error_No audio/Normal video Voltage and speaker checking...
  • Page 20 Standard Repair Process Established A. Video error 2016.03.07 Error date LED TV symptom No video/ Normal audio 1/12 Revised date First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, LVDS, Speaker Cable, IR B/D Cable) Check power board No video Check Back Light...
  • Page 21 Standard Repair Process Established Video error 2016.03.07 Error date LED TV symptom 2/12 No video/ No audio Revised date Check various voltage No Video/ Check and of mian board and power Normal No audio replace board(+5V_standby, Voltage MAIN B/D +12V_Normal) Replace Power Board and repair parts...
  • Page 22 Standard Repair Process Established A. Video error 2016.03.07 LED TV date Error symptom Revised date Tuning fail 3/12 Check RF signal cable Check whether other equipments have problem or not. Check RF Signal level (By connecting RF Cable at other equipment) →...
  • Page 23 Standard Repair Process Established Video error 2016.03.07 Error LED TV date symptom Color error Revised date 4/12 ※ Check Check color by input and replace -External Input Check external External Color Color Replace main chip Link Cable -COMPONENT/AV device and device/Cable error error...
  • Page 24 Standard Repair Process Established Video error 2016.03.07 Error date LED TV symptom Vertical / Horizontal bar, residual image, Revised date light spot, external device color error 5/12 Vertical/Horizontal bar, residual image, light spot Check color condition by input -External Input Screen -Component/AV normal...
  • Page 25 Standard Repair Process Established Power error Error 2016.03.07 date LED TV symptom Revised date 6/12 No power Replace DC Power on check power on Power On Check Normal Power "high",normal it is (LED Red off) by pressing Power Key Operati Power LED about 3.3V On Remote control...
  • Page 26 Standard Repair Process Established Power error 2016.03.07 Error LED TV date symptom Revised date Off when on, off while viewing, power auto on/off 7/12 Check outlet Check Power B/D Normal Replace Main B/D check power on Error voltage "high",normal it is Voltage about 3.3V Check A/C cord...
  • Page 27 Standard Repair Process Established Audio error 2016.03.07 Error LED TV date symptom No audio 8/12 Revised date Check amplifier Normal No audio power +AMP_Power Voltage Screen normal Replace amplifier or Replace main board Check mute control circuit normal it should be high-> (AMP_EN) Check Speaker disconnection...
  • Page 28 Standard Repair Process Established Audio error 2016.03.07 Error LED TV date symptom Wrecked audio/ discontinuation/noise Revised date 9/12 → abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio Check input signal Check and replace Check amplifier Wrecked Audio/ Signal speaker and Discontinuation/Noise...
  • Page 29 Standard Repair Process Established Function error 2016.03.07 Error date LED TV symptom Remote control & Local switch checking Revised date 10/12 1. Remote control(R/C) operating error Replace Main B/D Check & Repair Normal Normal Check IR Check R/C itself Normal Cable connection Normal Operating...
  • Page 30 Standard Repair Process Established Noise 2016.03.07 Error LED TV date symptom Circuit noise, mechanical noise 11/12 Revised date Replace PSU(with LED driver) Circuit Check location Identify of noise nose type noise Replace LED driver Check location of Check screw & internal Mechanical tape noise...
  • Page 31 Standard Repair Process Established Exterior defect 2016.03.07 Error LED TV date symptom Revised date Exterior defect 12/12 Zoom part with Module Replace module damage exterior damage Cabinet Replace cabinet damage Remote Replace remote controller Controller damage Stand Replace stand damage...
  • Page 32 Appendix : Exchange T -Con Board (1)
  • Page 33 Appendix : Exchange T -Con Board (2)
  • Page 34 Appendix : Exchange the Module (1)
  • Page 35 Appendix : Exchange the Module (2)
  • Page 36 Standard Repair Process Detail Technical Manual Error Established Video error_No video/Normal audio 2016. 03.07 symptom date LED TV Revised Content Backlight converter measuring method date 32inch 43inch 1. Measure DC ~15V applying to Backlight module section, Check the C9122. 2. Output DC~24V from Backlight module to Light bar module, Check the Pin1/2 of CN8601.
  • Page 37 Standard Repair Process Detail Technical Manual Error Established Video error_No video/ Audio 2016. 03.07 symptom date LED TV Revised Content Main Board voltage measuring method date Check all power point Parts Test point Check main 5V,3.3V ,V_CORE(1.2V),DDR_1.5V U701 +5V_Standby C738 U701 +5V_Standby U705...
  • Page 38 Standard Repair Process Detail Technical Manual Video error _Vertical/Horizontal bar, residual Error Established 2016. 03.07 image, light spot symptom date LED TV Revised LCD TV connection diagram (1) Content date As the part connecting to the external input, check the screen condition by signal...
  • Page 39 Standard Repair Process Detail Technical Manual Established Error Video error_Color error 2016. 03.07 symptom date LED TV Revised Content Check and replace Link Cable (LVDS) and contact condition date 32 inch 43 inch 1. Check and replace LVDS Cable. 2. Check LVDS connection condition.
  • Page 40 Standard Repair Process Detail Technical Manual Established Error Power error_No power 2016. 03.07 date symptom LED TV Revised Content Check front display LED date Remote control sensor Power Indicator...
  • Page 41 Standard Repair Process Detail Technical Manual Established Error Power error_No Power 2016. 03.07 date symptom LED TV Revised Content Check power input voltage and ST-BY 5V date Check “12V (CN701-1/2)” pin is high (about 12V) C738 +5V_Standby +3.3V_Standby C717 CN701-1/2 +12V...
  • Page 42 Standard Repair Process Detail Technical Manual Established Error Power error_No Power 2016. 03.07 date symptom LED TV Revised Content Check method when power is ON date Check “3.3V(R708)” pin is high (about 3.3V) CN701-1/2 +12V FB703 +3.3V_Normal C708 +5V_SW R708 +3.3 PS_ON...
  • Page 43 Standard Repair Process Detail Technical Manual Established Error Audio error_No audio /Normal video 2016. 03.07 date symptom LED TV Voltage and speaker checking method when Revised Content date there is no audio Checking order 1. Check the 12V for amplifier from C601. 2.
  • Page 44 Standard Repair Process Detail Technical Manual Established Error Function error_ No response in remote controller 2016. 03.07 date symptom LED TV Revised Content Remote controller operation checking method date 32 inch 43 inch Checking order 1. Check the 3.3V for IR power from CN401 PIN5 3.3V. 2.
  • Page 45 Standard Repair Process Detail Technical Manual Established Error Video error_Color error 2016. 03.07 symptom date LED TV Revised Content Check test pattern date Press “SETTINGS + 1999+Q.VIEW”to enter into factory mode, select “Burn in” item to switch different color pattern. NOTE:”Buin in”...

This manual is also suitable for:

32lh500d43lh500043lh500t