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LG 50UL3G Service Manual
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LG 50UL3G Service Manual

Chassis : uw92j
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LG Digital Signage
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71500378 (2006-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 © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
UW92J
50UL3G
50UL3G-BJ

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Summary of Contents for LG 50UL3G

  • 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 ..............5 SPECIFICATION ..................7 SOFTWARE UPDATE ................11 BLOCK DIAGRAM .................. 12 EXPLODED VIEW .................. 13 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 3 (Cleaning with a dirty or rough cloth may damage the panel.) CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 4 Mettre au rebut les batteries usagées conformément aux instructions du fabricant. VOrSIChT Explosionsgefahr bei unsachgemäßem Austausch der Batterie Entsorgung gebrauchter Batterien nach Anleitung - 4 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 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 - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 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. - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 Daisy Chain IR/Brightness Type Inner IR Sensor IR Receiver Brightness sensor CM3232 rJ45, 100Base- SuperSign CMS / Super- T(100Mbps) only Sign Control / SuperSign Control+ - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 Power On/Off only Onekey Input Change Time hDMI 1 / 2 3.0 sec + 10% below 1920x1080@60hz (1080p@60hz) rTC Clock Accuracy ± 3sec during 24 hours - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 Storage Temperature LGE Specification Storage humidity LGE Specification Absolute maximum rating Voltage(2 port) 2500Vac or 3540Vdc/1sec Current 100 mA (AC) / 10 mA(DC) Tilt(facedown) °(degree) - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 1080P 60hz 1080/60P 67.5 hDTV 1080P 60hz 1080/60P 67.5 uD 2160P 30hz 2160/30P hDMI1/2/3 112.5 uD 2160P 50hz 2160/50P hDMI1/2/3 uD 2160P 60hz 2160/60P hDMI1/2/3 - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 1) Push "IN-STArT" key in service remote control. 2) Select "Tool Option 1" and Push “Ok” button. 3) Punch in the number. (Each model has their number.) - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 BLOCK DIAGRAM - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 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 14 TROUBLE SHOOTING GUIDE Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 ※Precaution ☞A5 & A3 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 ☞A4 Check and Normal Check various voltages No Video/ replace voltage? of Power Board ( 13.2V) No audio MAIN B/D Replace Power Board and repair parts Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 Replace Main/T-con B/D device and error normal cable Request repair for external device/cable Check external External device device and /Cable Replace Main/T-con B/D HDMI cable error normal Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 Replace Screen (Check normal operation normal? Main /T-con of External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set- top Box etc. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 Measure Main Power voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY 3.5V at Main B/D voltage? Replace Power B/D ☞A10 Replace Power Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 Power off by S/W Download "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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 > Power Board Screen normal voltage Speaker Out Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board disconnection Replace Speaker Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 External Input (In case of External Input signal error) Connect and check Normal Check and fix other external device audio? external device Check and fix external device Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 Replace Main B/D in room (Power B/D don’t have problem) If R/C operate, Normal Close operating? Explain the customer cause is interference from light in room. Replace R/C Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 “NG”? INSTART menu Voltage? 1pin Main B/D ☞A13 Check & Repair Close Wifi cable connection ☞A5 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 - Fix information signal - S/W Version HDMI/ RGB Check and fix DVI/DP, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 ※ Describe the basis of the description in as shown in the solution manual “Part related to nose” in the Owner’s Manual. (For models without any fix information, provide the description) Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 Revised date 13/13 Module Zoom part Replace module damage with exterior damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 Exchange VX1 or EPI Cable or Main B/D (2) <Appendix> A-2/5 Defected Type caused by Main/ Inverter/ Exchange LED driver Board (PSU) A-3/5 Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 Voltage and speaker checking method when C. Audio error_No audio/Normal video there is no audio D. Function error_ No response in remote Remote control operation checking method A17-A18 control, key error Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 <43/55/65UL3G > <86UL3G > After turning on the power and disassembling the case, check with the naked eye, whether you can see light from module holes. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 1. Check the Voltage between LED+ / LED- 2. The Voltage spec is in Power B/D spec sheet 3. Refer to the Power B/D Spec sheet Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 2. Enter into White Balance of item 14. 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 Standard Repair Process Detail Technical Manual Error Established A. Video error_No video/ Audio symptom date Monitor Signage Revised Content Power Board voltage measuring method date Check the 13.2V and PWR_ON Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 Monitor Signage Version checking method Content date <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 Monitor Signage Revised Content Monitor signage connection diagram date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 Monitor Signage Revised Content Check Link Cable reconnection condition date <50/75/86UL3G> <43/55/65UL3G> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 38 You can view 8 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 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 A - 1/5 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 Appendix : Exchange VX1 or EPI Cable or Main B/D (2) Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack GRADATION Noise GRADATION A - 2/5 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 41 Appendix : Exchange Power Board No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 42 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 A - 4/5 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 43 Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect A - 5/5 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 44 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) Typ. 114 V 127 V 139 V SK100 (AC input) all condition meets, Power Board OK. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 45 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) Typ. 152.1 V 169 V 185.9 V SK100 (AC input) all condition meets, Power Board OK. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) SK100 (AC input) 175.5V 214.5V all condition meets, Power Board OK. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 47 ※ Home mode : General Customer Store mode : use Store 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) 272V, 410mA SK100 (AC input) Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) Voltage Current 204 V 420mA(399~441mA) 137 V 420mA(399~441mA) SK100 (AC input) all condition meets, Power Board OK. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 49 5. LED voltage Check : P801, Pin 1-3,5-7 Picture Condition : VIVID (Back light 100) Voltage Current (MS2) 240 V 410mA(393~434.8mA) 240 V 410mA(393~434.8mA) SK100 (AC input) all condition meets, Power Board OK. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 50 POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 51 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 52 2.Check the standby 3.5V on the terminal 16 pin (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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 53 EYE_SCL_JACK IR_JACK LED_R_JACK +3.5V_ST ② KEY2_JACK KEY1_JACK Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 22 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

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