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Standard Repair Process Detail Technical Manual

LED driver B+ measuring method

A. Video error_No video/Normal audio

A2

Established

date

Revised
date

Error

symptom

Content

A2

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

Monitor Signage

<86UL3G>

<43/55/65UL3G>

Copyright

ⓒ

2020 LG Electronics Inc. All rights reserved.

Only training and service purposes.

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Summary of Contents for 50UL3G

Page 1: ...ay 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 P NO MFL715003...

Page 2: ...ronics Inc All rights reserved Only training and service purposes CONTENTS CONTENTS 2 PRECAUTION 3 SERVICING PRECAUTIONS 5 SPECIFICATION 7 SOFTWARE UPDATE 11 BLOCK DIAGRAM 12 EXPLODED VIEW 13 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ...e electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the module If the surface of panel become dirty please wipe it off with a softmaterial Cleaning with a...

Page 4: ... ved fejlagtig håndtering Udskiftning må kun ske med batteri af samme fabrikat og type Levér det brugte batteri tilbage til leverandøren ATTENTION II y a danger d explosion s il y a remplacement incorrect de la batterie Remplacer uniquement avec une batterie du même type ou d un type équivalent recommandé par le constructeur Mettre au rebut les batteries usagées conformément aux instructions du fa...

Page 5: ...by touching a known earth ground 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 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 electrostatic charge buildup or ex...

Page 6: ...nts 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 a...

Page 7: ...YCbCr422 12bits HDMI2 Maximum Resolution 3840x2160 60Hz Recommend Resolu tion 3840x2160 60Hz HDCP Support HDCP2 2 HDCP1 4 Color Format Depth 4K 60 50Hz RGB444 YCbCr444 8bits YCbCr422 12bits YCbCr420 8 10 12bits 4K 30 25Hz RGB444 YCbCr444 8 10 12bits YCbCr422 12bits HDMI3 Maximum Resolution 3840x2160 60Hz Recommend Resolu tion 3840x2160 60Hz HDCP Support HDCP2 2 HDCP1 4 Color Format Depth 4K 60 50H...

Page 8: ... Protection Main Board in Wi Fi BT Wi Fi 802 11ac 802 11n Built in LGSBWAC72 BT Version 4 0 Support Beacon Logo Detach able Yes 4 Video signal Operating Fre quency Horizontal frequency 30 83 kHz Ultra Deep Color Off 3G All Inputs 30 136 kHz Ultra Deep Color On 6G HDMI1 2 3 Vertical frequency 56 60 Hz 58 62 Hz HDMI1 2 3 Synchronization Separate Sync Digital 5 Remote control Wireless Remote Control ...

Page 9: ...ff Condition No more than 3s 11 Module Life Time 30 000 50 000 Hrs 12 Uniformity 340 425 cd m2 13 Environ ment Condition Operation Temperature 0 40 deg LGE Specification Operation Humidity 10 80 LGE Specification Storage Temperature 20 60 deg LGE Specification Storage Humidity 5 85 LGE Specification 14 Absolute maximum rating Voltage 2 port 2500Vac or 3540Vdc 1sec Current 100 mA AC 10 mA DC mA 15 ...

Page 10: ... 1680 x 1050 V Lines 59 954 1089 1050 3 6 30 6 H Pixels 148 5 67 5 2200 1920 88 44 88 1920 x 1080 V Lines 60 1125 1080 4 5 46 7 H Pixels 297 67 5 4400 3840 176 88 296 3840 x 2160 HDMI1 2 3 V Lines 30 2250 2160 8 10 72 8 H Pixels 594 135 4400 3840 176 88 296 3840 x 2160 HDMI1 2 3 V Lines 60 2250 2160 8 10 72 3 1 HDMI PC Mode No H freq kHz V freq Hz Remarks Resolution Support 1 31 5 60 EDTV 480p 480...

Page 11: ...e Copying files from memory 4 Updating is starting 5 Updating Completed The Signage Set will restart automati cally 6 If your SIGNAGE SET is turned on check your updated version and Tool option explain the Tool option next stage If downloading version is more high than your SIGNAGE SET have SIGNAGE SET can lost all channel data In this case you have to channel recover if all channel data is cleare...

Page 12: ...N PHY1_RX0N PHY0_ARC OUT PHY2_RX0N PHY3_RX0N LAN MII AUDA_OUTL R_CH1 AUDIO OUT OP AMP SUB ASSY IR Light Sensor KEY WIFI BT Combo USB2_2 MICOM TI I2C I2C Temp Sensor I2C I2C RTC EEPROM 32Kb IR KEY1 Audio AMP 10W x2EA I2C I2S EYE_SDA SCL eMMC LCD Module 4Gb DDR3 2 4Gb DDR4 2 16Gb 2GB Vby1 8GB 3 840 x 2 160 60P RS 232C IN RS 232C OUT R1IN ROUT1 DOUT1 DIN1 R2IN DOUT2 DIN2 ROUT2 M1 M4 M4 M1 MUX UART_TX...

Page 13: ...electrical and mechanical parts in this chassis have special safety related characteristics These 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 ...

Page 14: ...TROUBLE SHOOTING GUIDE Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 15: ...n on off while viewing power auto on off 6 7 C Audio error No audio Normal video 7 8 Wrecked audio discontinuation noise 8 9 D Function error Remote control Local switch checking 9 10 Wifi operating checking 10 11 External device recognition error 11 12 E Noise Circuit noise mechanical noise 12 13 F Exterior error Exterior defect 13 First of all Check whether there is SVC Bulletin in GSCS System f...

Page 16: ...ower Board or parts 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 13 Monitor Signage Error symptom A Video error No video Normal audio A4 A1 A2 A5 A3 First of all Check whether all of cables between board is inserted properly or not Main B...

Page 17: ... and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A4 Established date Revised date 2 13 Error symptom 2 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 18: ...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 3 13 Error symptom 3 Copyright ⓒ 2020 LG Electronics Inc All...

Page 19: ...by 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 ...

Page 20: ...Measure Main Power voltage 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 at Main B D Replace Power B D N Y Normal voltage Replace Power B D Y A10 A4 A4 Standard Repair Process Established date Revised date 5 13 Error symptom Close 5 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service p...

Page 21: ... SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Download POWEROFF_UNKNOWN Power off by unknown status except listed case Abnormal POWEROFF_ABNORMAL1 Power ...

Page 22: ...r Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A4 Disconnection Established date Revised date 7 13 Error symptom Standard Repair Process 7 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 23: ...nly for External 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 Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check 13 2V Voltage Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D N End Established ...

Page 24: ...ir Cable connection Connector solder Normal operating Check B 3 5V On Main B D A12 Normal Voltage Close N N Check 13 2v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A4 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A12 Replace Main B D Y A12 Standard Repair Process Established date Revised date 9 13 Error symptom 9 Y 1 Remote control R C operati...

Page 25: ...Wifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 10 13 Error symptom 10 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A13 A5 A5 A13 Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 26: ...nal device cable HDMI RGB DVI DP 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 11 13 Error symptom Standard Repair Process 11 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 27: ...then proceed as shown in the solution manual For models without any fix information provide the description OR 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...

Page 28: ...et Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 13 13 Error symptom Standard Repair Process 13 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 29: ...ror_Color error Version checking method A5 6 connection diagram A6 7 Check Link Cable reconnection condition A7 8 Adjustment Test pattern ADJ Key A8 9 Appendix Defected Type caused by Main Inverter Module Exchange VX1 or EPI Cable or Main B D 1 A 1 5 10 Exchange VX1 or EPI Cable or Main B D 2 A 2 5 11 Exchange LED driver Board PSU A 3 5 12 Exchange Module itself 1 A 4 5 13 Exchange Module itself 2...

Page 30: ... when on off while viewing POWER OFF MODE checking method A15 16 C Audio error_No audio Normal video Voltage and speaker checking method when there is no audio A16 17 D Function error_ No response in remote control key error Remote control operation checking method A17 A18 Continued from previous page Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 31: ...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 module holes 86UL3G A1 Monitor Signage 43 55 65UL3G Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 32: ... audio A2 Established date Revised date Error symptom Content A2 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 Monitor Signage 86UL3G 43 55 65UL3G Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 33: ...ntent A3 Entry method 1 Press the ADJ button on the remote control for adjustment 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 Monitor Signage ALL MODELS Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 34: ...r Board voltage measuring method A Video error_No video Audio A4 Established date Revised date Error symptom Content A4 Check the 13 2V and PWR_ON Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 35: ...ror video lag stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version ALL MODELS A5 Established date Revised date Error symptom Content A5 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 36: ...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 Monitor Signage ALL MODELS Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 37: ...ideo 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 Monitor Signage 50 75 86UL3G 43 55 65UL3G Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 38: ... 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 A8 Established date Revised date Error symptom Content A8 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 39: ...en Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange VX1 or EPI Cable or Main B D 1 A 1 5 Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 40: ...ower Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange VX1 or EPI Cable or Main B D 2 A 2 5 Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 41: ...No picture Sound Ok Appendix Exchange Power Board No Light Dim Light Dim Light Dim Light A 3 5 Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 42: ... Light leakage Press damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage Un repairable Cases In this case please exchange the module Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 43: ...ertical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 A 5 5 Un repairable Cases In this case please exchange the module Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 44: ...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 all condition meets Power Board OK SK100 AC input Power Board Voltage Current D201 13 2V Center Pin P801 PWR ON MS P201 Picture Condition VI...

Page 45: ...nce 1 AC input Check SK100 100 240Vac 2 PWR ON Check J3 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 Check Hole 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store all condition meets Power Board OK SK100 AC input Power Board Voltage Current D201 13 2V Center Pin P801 P201 Picture Condition VIVID Back lig...

Page 46: ...heck Sequence 1 AC input Check SK100 100 240Vac 2 PWR ON Check J30 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 Check Hole 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store all condition meets Power Board OK SK100 AC input Power Board Voltage Current P801 MS D201 13 2V P201 Picture Condition VIVID Back ...

Page 47: ... Check Hole 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 Check Hole 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store Picture Condition VIVID Back light 100 272V 410mA A12 Power Board Voltage Current MS PWR ON D201 13 2V Center Pin Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 48: ... input Check SK100 100 240Vac 2 PWR ON Check PWR ON SET On above 3V SET St by 0V 3 13 2V DC Check D204 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 all condition meets Power Board OK SK100 AC input Power Board Voltage Current D204 13 2V Center Pin P801 PWR ON MS A13 P201 Picture Condition VIVID Back ligh...

Page 49: ... BY 7 8V B Power error _No power MS Level Range V LED On Off MS 0V 0 0 25 Off MS 2V 1 75 2 25 On Home mode MS 3V 2 75 3 25 On Store Mode Home mode General Customer Store mode use Store Picture Condition VIVID Back light 100 Voltage Current MS2 240 V 410mA 393 434 8mA 240 V 410mA 393 434 8mA SK100 AC input Power Board Voltage Current P201 all condition meets Power Board OK SET Model Power P N Name ...

Page 50: ...t item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A15 Established date Revised date Error symptom Content A15 Monitor Signage Copyright ⓒ 2020 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 51: ...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 A16 Established date Revised date Error symptom Content A16 Main Ass y Monitor Signage VSINC SIN GND SCLK Drv_ON PDIM1 A GND A GND A13 A13 D13 D13 D GND D13 Pwr_ON PDIM2 D GND D GND 1 SPK_R FT 2 SPK_R FT 3 S...

Page 52: ...anual Remote control operation checking method D Function error A17 Established date Revised date Error symptom Content A17 Checking order to check remote control IR EYE Sensor Pin Pin name 1 VCC 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL WIFI_ON 6 VCC 7 WIFI_SUSPEND 8 GND 9 COMBO_RESET 10 BT_WAKEUP_HOST 11 GND 12 GND 13 14 15 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED_R 21 GND 22 VCC 23 KEY2 24 KEY1 25 GND I...

Page 53: ...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 Checking order 1 Check BT Wifi cable condition between BT Wifi assy Main board 2 Check the 3 5V on the terminal 22 Wifi BT Front ALL MODELS Copyr...

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