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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 : LB22E MODEL : 60LM6450 60LM6450-TA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67441825 (1208-REV00) Printed in Korea...
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Technology Group. LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV) (3) Serial number D/L must be conformed when it is produced in production line, because serial number D/L is mandatory by e.
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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 Video error, video lag/stop, fail tunning 3, 4 A. Video error Color error Vertical/Horizontal bar, residual image, light spot, external device color error No power B.
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Contents of LCD TV Standard Repair Process Detail Technical Manual Error symptom Content Page Remarks Check LCD back light with naked eye LED driver B+ 24V measuring method A. Video error_ No video/Normal audio Check White Balance value Power Board voltage measuring method TUNER input signal strength checking method A.
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Standard Repair Process Established A. Video error 2010. 12 .14 Error date LCD TV symptom No video/ Normal audio Revised date 1/13 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,) ☞A1 ☞A4 Replace T-con Board...
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Standard Repair Process Established A. Video error 2010. 12 .14 Error date LCD TV symptom No video/ No audio Revised date 2/13 ☞A4 Check various voltages Check and No Video/ of Power Board Normal replace No audio ( 3.5V,12V,20V or 24V…) voltage? MAIN B/D Replace Power...
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Standard Repair Process Established A. Picture Problem 2010. 12 .14 Error date LCD TV symptom Picture broken/ Freezing Revised date 3/13 . By using Digital signal level meter ☞ A6 . By using Diagnostics menu on OSD ( Menu→ Set up→ Support → Signal Test ) Check RF Signal level - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%)
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Standard Repair Process Established A. Picture Problem (DVB-S/S2) 2011. 01 .24 Error date LCD TV symptom Tuning fail, Picture broken/ Freezing Revised date 3/13 ☞ A6 Check RF signal cable (DVB satellite signal or not) Check whether other equipments have problem or not. Check RF Signal level (By connecting RF Cable at other equipment) →...
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Standard Repair Process Established A. Video error 2010. 12 .14 Error date LCD TV symptom Color error Revised date 4/13 ☞A8 ☞ A10/ A11 ※ Check and Check color by input replace Link -External Input Color Cable Color Color -COMPONENT Replace Main B/D Replace module error?
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Standard Repair Process A. Video error Established 2010. 12 .14 Error date LCD TV symptom Vertical / Horizontal bar, residual image, Revised date 5/13 light spot, external device color error Vertical/Horizontal bar, residual image, light spot Replace Module ☞A8 ☞ A10/ A11 ☞...
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Standard Repair Process Established B. Power error 2010. 12 .14 Error date LCD TV symptom No power Revised date 6/13 ☞A17 ☞A19 DC Power on Replace Check Power LED Normal Check Power by pressing Power Key Power Power LED operation? On ‘”High”...
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Standard Repair Process Established B. Power error 2010. 12 .14 Error date LCD TV symptom Off when on, off while viewing, power auto on/off Revised date 7/13 Check outlet ☞A22 Check Power Off Check A/C cord Error? Replace Main B/D Normal? Mode Abnormal...
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Standard Repair Process Established C. Audio error 2010. 12 .14 Error date LCD TV symptom No audio/ Normal video Revised date 8/13 ☞A24 ☞A25 Check user Check audio B+ 24V No audio Normal menu > of Power Board Screen normal voltage Speaker off Cancel OFF...
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Standard Repair Process Established C. Audio error 2010. 12 .14 Error date LCD TV symptom Wrecked audio/ discontinuation/noise Revised date 9/13 → abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio ☞A25 Wrecked audio/ Check and replace Discontinuation/ Check audio speaker and...
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Standard Repair Process D. General Function Problem Established 2010. 12 .14 Error date LCD TV symptom Remote control & Local switch checking Revised date 10/13 1. Remote control(R/C) operating error Replace Main B/D ☞A27 ☞A27 ☞A27 Check & Repair Check R/C itself Normal Normal Check B+ 3.5V...
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Standard Repair Process Established D. Function error 2010. 12 .14 Error date LCD TV symptom External device recognition error Revised date 11/13 Check technical Check External Input information Signal Technical input Replace Main B/D And Component input? - Fix information information? signal Recognition error...
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Standard Repair Process Established E. Noise 2010. 12 .14 Error date LCD TV symptom Circuit noise, mechanical noise Revised date 12/13 Replace PSU(with LED driver) Check location Identify Circuit of noise nose type noise Replace LED driver Mechanical Check location noise of noise ※...
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Standard Repair Process Established F. Exterior defect 2010. 12 .14 Error date LCD TV symptom Exterior defect Revised date 13/13 Zoom part with Module Replace module Adjust VCOM exterior damage damage ☞A28 Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand...
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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 & ST-BY 5V B. Power error_No power Checking method when power is ON POWER BOARD voltage measuring method B.
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Standard Repair Process Detail Technical Manual Error Established A. Video error_No video/Normal audio 2010. 12 .14 symptom date LCD TV Revised Content Check White Balance value date <ALL MODELS> Entry method Entry method 1. Press the ADJ button on the remote controller for adjustment. 1.
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Standard Repair Process Detail Technical Manual Error Established A. Video error_No video/ Audio 2010. 12 .14 symptom date LCD TV Revised Content Power Board voltage measuring method date Check the DC 24V, 12V, 3.5V. 24 Pin (Power Board ↔ Main Board) – Common Edge LED SMAW200-H24S (YEONHO)
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Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop 2010. 12 .14 symptom date LCD TV Revised TUNER input signal strength checking method Content date <ALL MODELS> MENU - Set up support - signal test select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.)
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Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop 2010. 12 .14 symptom date LCD TV Revised LCD-TV Version checking method Content date <ALL MODELS> 1. Checking method for remote controller for adjustment Version Press the IN-START with the remote controller for adjustment...
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Standard Repair Process Detail Technical Manual Error A. Video error _Vertical/Horizontal bar, residual Established 2010. 12 .14 symptom date image, light spot LCD TV Revised Content LCD TV connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal...
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Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop 2010. 12 .14 symptom date LCD TV Revised TUNER checking part Content date <ALL MODELS> Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2.
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Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error 2010. 12 .14 symptom date LCD TV Revised Adjustment Test pattern - ADJ Key Content date You can view 6 types of patterns using the ADJ Key Checking item : 1. Defective pixel 2.
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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...
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Appendix : Exchange PSU(LED driver) No Light Dim Light Dim Light Dim Light No picture/Sound Ok...
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Appendix : Exchange the Module (1) 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...
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Appendix : Exchange the Module (2) Vertical Line Vertical Block Vertical Block Source TAB IC Defect Source TAB IC Defect Source TAB IC Defect Horizontal Block Horizontal line Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Un-repairable Cases...
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Standard Repair Process Detail Technical Manual Error Established B. Power error _No power 2010. 12 .14 symptom date LCD TV Revised Content Check front display LED date Front LED control : Menu Option Power Indicator Standby light ON ST-BY condition: Red Power ON condition: white...
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Standard Repair Process Detail Technical Manual Error Established B. Power error _No power 2010. 12 .14 symptom date LCD TV Revised Content Check power input voltage and ST-BY 5V date For ’10 models, there is no voltage out for st-by purpose. When st-by, only 3.5V is normally on.
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Standard Repair Process Detail Technical Manual Error Established B. Power error _No power 2010. 12 .14 symptom date LCD TV Revised Content Checking method when power is ON date Check “power on” pin is high 24 Pin (Power Board ↔ Main Board) - Common SMAW200-H24S (YEONHO) Edge LED...
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Standard Repair Process Detail Technical Manual Error Established B. Power error _Off when on, off whiling viewing 2010. 12 .14 symptom date LCD TV Revised Content POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote controller for adjustment 2.
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Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video 2010. 12 .14 symptom date LCD TV Revised Content Checking method in menu when there is no audio date <ALL MODELS> Checking method 1. Press the MENU button on the remote controller 2.
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Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video 2010. 12 .14 symptom date LCD TV Revised Voltage and speaker checking method Content date when there is no audio <ALL MODELS> 24 Pin (Power Board ↔ Main Board) - Common ①...
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Standard Repair Process Detail Technical Manual Error D. Function error_ No response in remote controller, Established 2010. 12 .14 symptom key error date LCD TV Revised Content Remote controller operation checking method date <ALL MODELS> P4102 KEY1 KEY2 ③ St 3.5V RED_LED ④...
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Standard Repair Process Detail Technical Manual Error Established D. VCOM Adjustment 2010. 12 .14 symptom date LCD TV Revised Content Sequence of the Vcom adjustment date 1. Case ■ LCD module change ■ T-Con board change 2. Equipment ■ Service Remote controller 3.