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LG 24LQ520S Service Manual
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LG 24LQ520S Service Manual

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LED TV
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70446540 (2204-REV00)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
Copyright © 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
LM22N
24LQ520S
24LQ520S-PU
24LQ520S-WU

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Summary of Contents for LG 24LQ520S

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
  • Page 2 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 SOFTWARE UPDATE ................9 BLOCK DIAGRAM .................. 10 EXPLODED VIEW .................. 11 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 3 When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 4 Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the - 4 - Copyright © LG Electronics Inc. All rights reserved. Only 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. 3. Solder the connections. - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 Refer 5. Feature and Func- tion USB Input EMF, DivX HD, For JPEG, MP3, Refer 5. Feature and Func- SVC (download) DivX HD tion - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 Remote control Wireless Remote Control Remocon Code LG code Local Key One Key(Power On/Off) Set Installation Wall Mount / Desk top - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 48.36 VESA(XGA) 1360*768 47.71 60.01 84.75 VESA(WXGA) 1152*864 54.34 60.05 VESA 1280*1024 63.98 60.02 SXGA FHD, UHD, 8K only 1920*1080 67.5 158.4 WUXGA(Reduced Blanking) - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 In this case, you have to channel recover. If all channel data is cleared, you didn’t have a DTV/ ATV test on production line. - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 BLOCK DIAGRAM - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 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. Do not modify the original design without permission of manufacturer. Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 TROUBLE SHOOTING GUIDE Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 ※Precaution ☞A4 & A2 Always check & record S/W Version and White Replace Adaptor Re-enter White Balance value Balance value before replacing the Main Board Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 Revised date 2/16 ☞A9 Check various Check and No video / Normal voltages of Adaptor replace No audio voltage? (19V…) MAIN B/D Replace Adaptor and repair parts Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 1. Reconnection 2. Install Booster S/W Upgrade Normal Contact with signal distributor or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 Replace Main/T-con B/D Component device/Cable cable error normal Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/Cable error cable normal Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 -External Input version HDMI External Input, HDMI by normal? -HDMI error connecting Jig, pattern Generator ,Set-top Box etc. S/W Upgrade Request repair for external device Normal screen? Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 Measure voltage of each output of Power B/D Normal? Normal ☞A9 Replace Main B/D voltage? Normal Check ST-BY 7.8V Close voltage? Replace Adaptor Replace Adaptor Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 (If Power Off mode is not displayed) Normal Replace Main B/D Check Adaptor voltage? voltage ※ Caution Check and fix exterior Replace Adaptor of Power B/D Part Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 Reboot by SW down load function UNKNOWN No meaning (same as initial value) COMP_END OLED threshold voltage degradation(Compensation) completes. PNWASHDONE Power off by panel noise wash function complited. (OLED) Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 -> of DCDC IC. Screen normal voltage Speaker off Cancel OFF Replace Adaptor and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 External Input (In case of Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 Replace Main B/D (Adaptor don’t have problem) If R/C operate, Normal Close Explain the customer operating? cause is interference from light in room. Replace R/C Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 “00.00”? Replace MR22x Close Down load the Firmware * If you conduct the loop at 3times, change the M22x INSTART MENU  11. RF Remote Test Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 “NG”? 1pin Voltage? Main B/D INSTART menu ☞A14 Close Check & Repair WIFI cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the WIFI assy Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 - Fix information information? Recognition error signal - S/W Version HDMI Optical Check and fix Recognition Fix in external device/cable error accordance with technical information Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 KMS fix information and “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 Revised date 16/16 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 Exchange Module (1) ~ (3) A-6/11 ~ A-8/11 Inverter/ Module Exchange T-Con (1) ~ (2) A-9/11 ~ A-10/11 Exchange Adaptor(PSU) A-11/11 Continue to the next page Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 (Magic) Remote/WIFI operation checking method How to use the Service remote control A15-A17 E. Etc Check items after Main B/D replacement Adjustment Test pattern – ADJ Key Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 Check LCD back light with naked eye Content date After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 2. Enter into White Balance. 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. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 TUNER input signal strength checking method date  All Settings Programmes Programme Tuning & Settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 Revised Content Version checking method date <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 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 ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 Established symptom residual image, light spot date Revised Content Connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 38 A. Video error_Color error symptom date Revised Content Check Link Cable(LVDS) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 CABLE Screen darkness disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 Color spread LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 41 Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner Inner side quality problem A - 3/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 42 Main Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 43 Main Screen picture spread problem Screen problem No problem at the initial stage. Right-side picture Main During Heat run, right-side picture problem problem A - 5/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 44 BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken A - 6/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 45 BLU Vertical spreading on cube screen in no MODULE Vertical smear signal MODULE Over color Screen contour part brightly Over color A - 7/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 Center of the screen 1 block dark MODULE Screen darkness MODULE Vertical bar Center Vertical Bar Darkness at the MODULE bottom of the MODULE internal BLU breakage screen A - 8/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 47 T-Con is defective and the picture below the T-CON image broken screen is broken screen lower T-Con is defective and the picture below the T-CON image broken screen is broken A - 9/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 The entire screen is dark and bit noise T-CON Image Broken occurs The entire screen is dark and bit noise T-CON Image Broken occurs A - 10/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 49 Appendix : Exchange Adaptor No Light No picture/Sound Ok A - 11/11 Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 50 B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition : On or Off Power ON condition : Turn Off Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 51 1. 19V DC Check : JK1200, 4 pin - SET On : 19V 2. LED B+ voltage Check : P1200, 1 pin All condition meets, Adaptor OK. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 52 POWER OFF MODE checking method date <ALL MODELS> RELEASE Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 53 1. Press the Setting button on the remote control. 2. Select the Sound function of the Menu. 3. Select the Sound Out. 4. Select TV Speaker. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 54 2. Connect the tester P5300 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 ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 55 2. Check the standby 3.5V on the terminal (③). 3. AS checking the Pre-Amp(IR LED light), the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 56 Checking order to check motion remote/WIFI Checking order 1. Check BT/WIFI cable condition between BT/WIFI assy & Main board. 2. Check the 3.5V on the terminal 1 pin. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 57 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date 1. How to access the remote control RELEASE Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 58 Function) Digital EYE function ON/OFF For some Model, access to the Test Pattern TILT Used for screen tilting change (Access to the old PDP control mode) Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 59 AV1,2,3 (Added function) Connects to external input 1,2,3 COMP1,2 (Added function) Connects to Component 1,2 HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 60 - Record the R, G, B (GAIN, Cut) value of the color temperature before main board replacement. After replacing the main board, key in the recorded value. Copyright ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 61 You can view 9 types of patterns using the ADJ Key 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 ⓒ 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.

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