LG 50UM7300AUE Service Manual Download Page 67

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Checking order when there is no audio

1.Check the contact condition of or 13.2V connector of Main Board

2. Measure the 13.2V input voltage supplied from Power Board

(If there is no input voltage, remove and check the connector)

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.

Standard Repair Process Detail Technical Manual

Voltage and speaker checking method
when there is no audio

C. Audio error_No audio/Normal video

A22

Established

date

Revised

date

Error

symptom

Content

A22

①

②

③

SPK_R-FT

SPK_R+FT

SPK_L-FT

SPK_L+FT

Only for training and service purposes.

Summary of Contents for 50UM7300AUE

Page 1: ...il 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 2019 LG Elect...

Page 2: ... rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 10 BLOCK DIAGRAM 12 EXPLODED VIEW 13 DISASSEMBLY 14 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ...he set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as ...

Page 4: ...c charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrosta...

Page 5: ...oints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 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 CAUTION Maintain original spacing between the replaced component...

Page 6: ...erated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 4 General Specification No Item Specification Remark 1 Market North America 2 Broadcasting system ATSC NTSC M 64 256 QAM 3 Available Channel VHF 02 13 UHF 14 69 DTV 02 69 CATV 01 135 CADTV 01 135 4 Receiving system Digital ...

Page 7: ...0 297 UDTV 2160P 14 3840 2160 112 5 50 594 UDTV 2160P 15 3840 2160 135 60 594 UDTV 2160P 16 3840 2160 225 100 1188 UDTV 2160P 17 3840 2160 270 120 1188 UDTV 2160P 18 4096 2160 53 95 23 97 296 7 UDTV 2160P 19 4096 2160 54 24 297 UDTV 2160P 20 4096 2160 56 25 25 297 UDTV 2160P 21 4096 2160 67 5 30 297 UDTV 2160P 22 4096 2160 112 5 50 594 UDTV 2160P 23 4096 2160 135 60 594 UDTV 2160P 24 4096 2160 225...

Page 8: ...80P 16 1920 1080 27 24 63 36 HDTV 1080P 17 1920 1080 33 71 29 97 79 12 HDTV 1080P 18 1920 1080 33 75 30 79 2 HDTV 1080P 19 1920 1080 56 25 50 148 5 HDTV 1080P 20 1920 1080 67 43 59 94 148 35 HDTV 1080P 21 1920 1080 67 5 60 148 5 HDTV 1080P 22 1920 1080 112 5 100 297 HDTV 1080P 23 1920 1080 134 86 119 88 296 7 HDTV 1080P 24 1920 1080 135 120 297 HDTV 1080P 25 3840 2160 53 95 23 98 296 7 UDTV 2160P ...

Page 9: ...1188 8K 8K Model Only 52 7680 4320 220 50 2376 8K 8K Model Only 53 7680 4320 263 74 59 94 2376 8K 8K Model Only 54 7680 4320 264 60 2376 8K 8K Model Only No Resolution H freq kHz V freq kHz Pixel clock MHz Proposed 1 720 480i 15 73 59 94 13 5 SDTV DVD 480I 525I 2 720 480i 15 75 60 13 514 SDTV DVD 480I 525I 3 720 576i 15 625 50 13 5 SDTV DVD 576I 625I 50Hz 4 720 480p 31 47 59 94 27 SDTV 480P 5 720 ...

Page 10: ...USB port 2 Automatically detect the SW Version and show the below message 3 Click YES initiate the download and install of the update 4 Click Check Now move to About This TV page for update 5 TV is updating 6 After finished the update below Pop up appear 7 Click Yes TV will be DC OFF ON 8 After TV turned on Check the updated SW Version and Tool Option ...

Page 11: ... update progress go to Menu All Settings General About This TV 4 If you want to cancel update click 1 1 CANCEL UPDATE 5 NO Keep updating Yes Cancel updating Case 2 NOT Allow Automatic Updates Toggle Item 1 Menu All Settings General About This TV 2 TV will automatically check for updates when every TV boots When an updated is detected the TV will issue an Alert letting the user know that an update ...

Page 12: ...ain PMIC M0 M1 IF CVBS SIF GST MCLK GCLK EO I2C 6 NVRAM 256Kb I2C_1 I2C 2 EPI CEDS block TS DDR3 2133 X 32 256MB X 2EA DDR3 2133 X 32 512MB X 2EA EPI 60P 65 8 lane 55 6lane CEDS 68P IR KEY I2C_SDA_1 1 5V DDR 0 95V Core CPU 3 3V Normal 1 0V Eth 3 5V ST_BY 1 8V 5V Normal Sub PMIC 0 95V 1 5V 3 3V 5V 1V 1 8V 3 5V_ST 0 95V 1 5V 3 3V 3 3V 5V 1V 1 8V 1 8V 3 5V_ST 3 5V_ST 3 3V 3 5V_ST 3 5V_ST 13V 3 5V_ST ...

Page 13: ...se parts are identified by in 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 Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 400 540 LV1 521 570 800 530 121 HP1 HS1 HW1 AR1 A10 700 901 120 500 820 902 571 Stand Screw ARC1 A...

Page 18: ...p Step 1 Main PSU SPK Wifi IR disassemble White Tape Delete Step 2 S PCB Cover Shield L R disassemble Step 3 LCM reverse and disassemble Source PCB from Holder Step 4 Case Top Screw disassemble back side screw and Case Top disassemble Rear Sliver screw 5ea top 5ea side L 5ea side R 6ea down side 7ea down Top Side White Tape ...

Page 19: ...el disassemble Step 6 Guide Panel disassemble Step 7 Optical Sheet disassemble DS Prism middle Prism down DP Step 8 DPS LED Fixer disassemble Reflector Sheet disassemble rotate DPS 6ea push LED fixer in back 4ea Move the FFC to the panel use the tape top 7ea side L 4ea side R 4ea down 6ea down Top Side ...

Page 20: ...h the Double Tape 1 Attach the Double Tape in Guide Line of Cover Bottom 4ea 2 Remove the protect film of Double Tape Step 2 Attach the LED Array 1 Attach the LED Array to the round hole on Cover Bottom embo 2 Press the LED Array on the surface of Cover Bottom 3 Connect the CNT to the LED Array C Bottom Guide Line Finish the Attached Double Tape 4ea NG OK Finish the Attached LED Array 4ea Inch 43 ...

Page 22: ... while viewing power auto on off 7 8 8 C Audio error No audio Normal video 9 9 Wrecked audio discontinuation noise 10 10 D Function error Remote control Local switch checking 11 MR19 remote operating checking 12 11 12 Wifi operating checking 13 14 External device recognition error 14 15 E Noise Circuit noise mechanical noise 15 16 F Exterior error Exterior defect 16 First of all Check whether ther...

Page 23: ...ts End Always check record S W Version and White Balance value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 16 Error symptom A Video error No video Normal audio A18 A1 A18 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS or EPI Cable ...

Page 24: ...o Check and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A18 Established date Revised date 2 16 Error symptom 2 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 25: ...ain B D Check Tuner soldering Normal Picture Y N Y Close Y Close By using Digital signal level meter By using Diagnostics menu on OSD Advanced Channels Channel Tuning Manual Tuning Check the Signal Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N Normal Picture Y Close N A4 Standard Repair Process Establishe...

Page 26: ...Check external device and cable Y External device Cable normal HDMI error Check external device and cable Replace Main T con B D Replace Main T con B D N N A Video error Color error A6 N Y End Replace module Request repair for external device cable Color error Check Test pattern A8 A7 Standard Repair Process Established date Revised date 4 16 Error symptom 4 Copyright 2019 LG Electronics Inc All r...

Page 27: ...y connecting Jig pattern Generator Set top Box etc N Y Replace Main T con B D Screen normal Check screen condition by input External Input Component HDMI DVI Request repair for external device Component error HDMI DVI Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc Replace Main T con B D...

Page 28: ...oltage of each output of Power B D N Y Normal voltage Replace Main B D Y OK Replace Main B D N Y Normal Check ST BY 3 5V Replace Power B D N Y Normal voltage Replace Power B D Y A17 A18 A18 A18 Standard Repair Process Established date Revised date 6 16 Error symptom 6 Stand By Red or Turn On Operating Turn Off Close Copyright 2019 LG Electronics Inc All rights reserved Only for training and servic...

Page 29: ...phase out Check A C cord Check for all 2 phase power out Check outlet Replace Main B D CPU Abnormal Replace Power B D N Y Normal End Established date Revised date 7 16 Error symptom Standard Repair Process 7 Abnormal 1 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 30: ...gh Check fail after multi power on Check Change Power B D CPUABNORMAL If the CPU attempts to reset in case of abnormal operation and Shut Down in case of failure Check Change Main B D NO POLING Power off when receiving no ack RESULT TV power off on Reboot CONDITION There is no I2C response from CPU for 15 seconds Check Change Main B D CPUCMD Power off by main SoC command Check Change Main B D INV_...

Page 31: ... Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A20 A21 A18 Disconnection Established date Revised date 9 16 Error symptom Standard Repair Process 9 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 32: ...nal Input Connect and check other external device N Y Normal audio Check and fix external device Replace Power B D N Y Normal voltage Check input signal RF External Input signal Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 13 2V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B ...

Page 33: ...heck Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A22 Normal Voltage Close N N Check 3 5v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A18 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A22 Replace Main B D Y A22 Standard Repair Process Established date Revised date 11 16 Error s...

Page 34: ...blished date Revised date 12 16 Error symptom Replace MR19 Turn off on the set and press the wheel Press the back key about 5sec Close If you conduct the loop at 3times change the MR19 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Down load the Firmware INSTART MENU 14 RF Remocon Test 3 Firmware download Y RF Receiver ver is 00 00 N Close A23 A4 A4 12 Copyri...

Page 35: ...ifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 13 16 Error symptom 13 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A24 A4 A4 A24 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 36: ...eck and fix external device cable HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information D Function error External device recognition error Established date Revised date 14 16 Error symptom Standard Repair Process 14 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 37: ...d as shown in the solution manual For models without any fix information provide the description Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part related to nose in the Owner s Manual E Noise Circuit noise mechanical noise Established date Revised date 15 16 Error s...

Page 38: ...e cabinet Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 16 16 Error symptom Standard Repair Process 16 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 39: ...ecking Part A5 6 A Video error _Vertical Horizontal bar residual image light spot Connection diagram A6 7 A Video error_ Color error Check Link Cable Vx1 EPI reconnection condition A7 8 Appendix Defected Type caused by T Con Inverter Module Check Cable 1 2 A 1 11 A 2 11 9 Exchange Main Board 1 3 A 3 11 A 5 11 10 Exchange Module 1 3 A 6 11 A 8 11 11 Exchange T Con 1 2 A 9 11 A 10 11 12 Exchange Pow...

Page 40: ... menu when there is no audio A21 17 Voltage and speaker checking method when there is no audio A22 18 D Function error Remote control operation checking method A23 19 Motion Remote operation checking method A24 20 E Etc How to use the Service remote control A25 A27 21 Check items after Main B D replacement A28 22 Adjustment Test pattern ADJ Key A29 23 How to use JIG Power B D Diganostic Smart Jig ...

Page 41: ... Content Check LCD back light with naked eye A Video error_No video Normal audio After turning on the power and disassembling the case check with the naked eye whether you can see light from locations A1 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...ideo Normal audio A2 ALL MODELS Entry method 1 Press the ADJ button on the remote control for adjustment 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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ...20dB etc Standard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A3 Established date Revised date Error symptom Content A3 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...or video lag stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version ALL MODELS A4 Established date Revised date Error symptom Content A4 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 45: ...easuring each voltage from power supply finally replace the MAIN BOARD Standard Repair Process Detail Technical Manual TUNER checking part A Video error_Video error video lag stop A5 Established date Revised date Error symptom Content A5 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...ical Horizontal bar residual image light spot As the part connecting to the external input check the screen condition by signal A6 Established date Revised date Error symptom Content A6 ALL MODELS Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ... condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content A7 43 49 55 65UM73 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 48: ...ction condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content A7 50UM73 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ...ction condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content A7 70UM73 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...n of FFC cable CABLE R Color Excessive Color is Excessive due to FFC Cable Contact CABLE Screen darkness screen is dark due to poor contact due to disconnection of the FFC cable pin CABLE G Color Excessive G color transient due to poor FFC cable connection Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 51: ...ead LVDS cable connection problem CABLE Color spread LVDS cable connection problem CABLE Screen stop Due to foreign substance withi nLVDS cable PIN Appendix Examples of Symptoms Image error Check for poor cable contact Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...Main Screen noise Broken screen due to Main IC problem Main Dark picture Dark left side screen Main Broken picture Top bottom screen part Picture problem due to tuner Inner side quality problem Appendix Examples of Symptoms Main Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 53: ...anner Main Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen Check parts by symptom Appendix Examples of Symptoms Main Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 54: ...n problem Right side screen problem Main LG logo Screen problem Screen picture spread problem Main Right side picture problem No problem at the initial stage During Heat run right side picture problem Check parts by symptom Appendix Examples of Symptoms Main Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 55: ...the screen MODULE Internal matter BLU internal foreign matter inflow MODULE Image broken 6 block image broken MODULE Image broken Screen sync signal broken A 6 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 56: ...ng due to lateral external impact and internal bending of BLU MODULE Vertical smear Vertical spreading on cube screen in no signal MODULE Over color Screen contour part brightly Over color A 7 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 57: ...nter of the screen 1 block dark MODULE Vertical bar Center Vertical Bar MODULE Darkness at the bottom of the screen MODULE internal BLU breakage A 8 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 58: ...d the picture below the screen is broken T CON screen lower image broken T Con is defective and the picture below the screen is broken T CON screen lower image broken T Con is defective and the picture below the screen is broken A 9 11 Check parts by symptom Appendix Examples of Symptoms T Con Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 59: ...f the screen Initial normal operation upper darkness during heat run T CON Image Broken The entire screen is dark and bit noise occurs T CON Image Broken The entire screen is dark and bit noise occurs A 10 11 Check parts by symptom Appendix Examples of Symptoms T Con Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 61: ...k front Power Indicator B Power error _No power A17 Established date Revised date Error symptom Content A17 ST BY condition On or Off Power ON condition Turn Off Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 62: ... Check Sequence 1 AC input Check SK100 100 240Vac 2 PWR ON Check Check Hole SET On above 3V SET St by 0V 3 13 2V DC Check D201 center Pin SET On 13 2V SET St by 7 8V 4 MS Level Check MS 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store Picture Condition VIVID Back light 100 Min Max 114 V 139 V SK100 AC input Power Board Voltage Current D201 13 2V Center Pin all condi...

Page 63: ...25 On Store Mode Power Check Sequence 1 AC input Check SK100 100 240Vac 2 PWR ON Check SET On above 3V SET St by 0V 3 13 2V DC Check J21 SET On 13 2V SET St by 7 8V 4 MS Level Check MS 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store Picture Condition VIVID Back light 100 Min Max 100 8V 123 2V all condition meets Power Board OK SK100 AC input P801 P201 PWR ON Power ...

Page 64: ...2 75 3 25 On Store Mode Power Check Sequence 1 AC input Check SK100 100 240Vac 2 PWR ON Check SET On above 3V SET St by 0V 3 13 2V DC Check SET On 13 2V SET St by 7 8V 4 MS Level Check MS 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store Picture Condition VIVID Back light 100 Min Max 152 V 185 V SK100 AC input Power Board Voltage Current all condition meets Power Boa...

Page 65: ...75 3 25 On Store Mode Power Check Sequence 1 AC input Check SK100 100 240Vac 2 PWR ON Check SET On above 3V SET St by 0V 3 13 2V DC Check SET On 13 2V SET St by 7 8V 4 MS Level Check MS 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store Picture Condition VIVID Back light 100 Min Max 273 6V 334 4V all condition meets Power Board OK SK100 AC input P801 P201 Power Board ...

Page 66: ...und Out 4 Select TV Speaker Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A21 Established date Revised date Error symptom Content A21 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 67: ...speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video A22 Established date Revised date Error symptom Content A22 1 SPK_R FT 2 SPK_R FT 3 SPK_L FT 4 SPK_L FT Copyright 2019 LG Electronics Inc A...

Page 68: ...thod D Function error A23 Established date Revised date Error symptom Content A23 Checking order to check remote control IR LED EYE Sensor IR Eye LED Pin Pin name 1 3 5V_WIFI 2 WIFI_DM_JACK 3 WIFI_DP_JACK 4 GND 5 WOL WIFI_POWER_ON_JACK 6 3 5V_WIFI 7 WIFI Suspend Resume_Jack 8 GND 9 COMBO_RESET_JACK 10 BT_WAKEUP_HOST_JACK 11 GND 12 13 NC 14 NC 15 NC 16 EYE_SDA_JACK 17 EYE_SCL_JACK 18 GND 19 IR_JACK...

Page 69: ...ecking order to check motion remote wifi Wifi BT Front Wifi BT Rear Pin Pin name 1 3 5V_WIFI 2 WIFI_DM_JACK 3 WIFI_DP_JACK 4 GND 5 WOL WIFI_POWER_ON_JACK 6 3 5V_WIFI 7 WIFI Suspend Resume_Jack 8 GND 9 COMBO_RESET_JACK 10 BT_WAKEUP_HOST_JACK 11 GND 12 13 NC 14 NC 15 NC 16 EYE_SDA_JACK 17 EYE_SCL_JACK 18 GND 19 IR_JACK 20 LED_R_JACK 21 GND 22 3 5V_ST 23 KEY2_JACK 24 KEY1_JACK 25 GND A24 Copyright 20...

Page 70: ...to use the Service remote control D Function error A25 Established date Revised date Error symptom Content A25 0 4 1 3 0 4 1 3 1 How to access the remote control Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 71: ...Cinema Zoom Aucto Screen 4 3 16 9 PSM Changes in the order of Bright Picture Easy Picture Cinema Spots Game Custom PIcture1 Custom Picture2 Bright Picture SSM Added Function Standard user music cinema sports game standard user PIP Picture In Picture is activated TEXT Access to the Power Only mode CAP Broadcasting caption on off MPX Stereo mode mono stereo foreign language access Used when in facto...

Page 72: ...attern Off White Red Green Blue Black Pattern Off Change X STUDIO Added function HDD USB external device s HDD screen is activated MENU User function gets activated EXIT Exit from the current mode TIME SHIFT Added function Moves forward backward of recorded contents MUTE Mute function 0 Volume IN STOP SET to factory mode VOL Volume Up Down CH Channel Up Down AV1 2 3 Added function Connects to exte...

Page 73: ...ber D L Key in the model name and serial number after checking the ID label on the back cover 1 Press the Service remote control instart Key 2 Press the Service remote control ADJ Key No 13 Select White Balance 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 2019 LG Electronics Inc All rights ...

Page 74: ... 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 A29 Established date Revised date Error symptom Content A29 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 76: ...K80 UK89 SK85 SK96 SK95 SK99 SM90 SM98 18Y 19Y UK63 UK64 UK65 UK68 UK7050 UM73 UM74 UM75 UM76 UM79 UM80 New JIG OLD JIG Cable Connection 18 Marking check No Marking 24 Marking Check 15Y OLED 17 18Y 19Y W7 B8 C8 E8 G8 W8 B9 C9 E9 W9 18Y 19Y LK57 32 43 49LK54 32LK61 32LK62 43 49LK61 LM57 LM63 18Y 19Y UK74 UK75 UK77 UK78 SK79 SM80 SM86 16Y UH 16 18Y 19Y UH UK UM 17Y 18Y SJ UJ UK SK 16Y 17Y UH SJ 16Y ...

Page 77: ... LH68 LH66 LH60 LH54 17 OLED B7 C7 E7 G7 W7 17 LED SJ95 UJ98 SJ85 UJ94 SJ80 UJ77 UJ75 UJ78 UJ65 UJ68 UJ63 UJ67 LJ61 LJ68 LJ55 LJ58 18 LED SK80 SK85 SK95 UK78 UK75 UK77 SK79 UK63 UK64 UK65 UK68 UK7050 LK57 32 43 49LK54 32LK61 62 43 49LK61 18 OLED B8 C8 E8 G8 W8 19 LED SM80 SM85 SM86 UM73 UM74 UM75 UM76 UM79 UM80 LM57 LM63 19 OLED B9 C9 E9 W9 Copyright 2019 LG Electronics Inc All rights reserved Onl...

Page 78: ...4 LCD POWER A 2013 Power Board Muitl Gender How to Connect Connect the Muiti Gender to the connector black as shown in picture 2 of the Smart JIG Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 79: ...agnosis can be made only if it is set correctly 24V Power Board Change the switch to 24V of Smart Jig Voltage 20V Power Board Change the switch to 24V of Smart Jig Voltage 13 2V 18V Power Board Change the switch to 24V of Smart Jig Voltage Power B D Smart Jig Voltage Switch 24V 24V 20V 20V 13 2V 18V 24V Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 80: ... Power Cable connector to the Muitl Gender JIG 24Pin connector 3 1 2 Check power board voltage Switch the product S W in JIG to LCD LCD MODEL Check the power voltage and switch 24V to the correct voltage Fix the LCD MODEL switch to 24V Smart JIG 4 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 81: ...oard Diagnostic method 2 5 6 When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 82: ...1 3 2 Switch the LCD MODEL S W to 24V by checking the power voltage Fix the LCD MODEL switch to 24V Smart JIG When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 83: ... switch to 24V Smart JIG Disconnect the Main Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 84: ... Main Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 85: ... Main Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 86: ... the Muitl Gender JIG 28Pin connector Switch the LCD MODEL S W to 20V by checking the power voltage Fix the LCD MODEL switch to 20V Smart JIG When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 87: ... Muitl Gender JIG 28Pin connector Switch the LCD MODEL S W to 20V by checking the power voltage Fix the LCD MODEL switch to 20V Smart JIG When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 88: ...the Main Board 18Pin Power Cable connector Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 89: ...the Main Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector When the OK 24V 12V LED turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 90: ...t the Main Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 91: ...the Main Board 12Pin Power Cable connector Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 92: ...e Main Board 12Pin Power Cable connector Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 93: ...e Main Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector When the OK LED 24V 12V turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

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