LG 55EF9500, Service Manual

Page 1: ...ODEL 55EF9500 55EF9500 UA CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL OLED TV SERVICE MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ...Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 13 BLOCK DIAGRAM 24 EXPLODED VIEW 34 TROUBLESHOOTING APPENDIX ...

Page 3: ...inals etc to be sure the 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 m...

Page 4: ...lectrostatic 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...

Page 5: ...he solder joints 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 replace...

Page 6: ...dard Voltage of each product is marked by models 4 Specification and performance of each parts are followed each drawing and specification by part number in accordance with BOM 5 The receiver must be operated for about 20 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL CSA CE IEC specification EMC FCC ICES CE IEC spec...

Page 7: ... H freq kHz V freq Hz Pixel clock MHz Proposed Remarks 1 720 480i 15 73 59 94 13 50 SDTV DVD 480I 525I 2 720 480i 15 73 60 00 13 51 SDTV DVD 480I 525I 3 720 480p 31 47 59 94 27 00 SDTV 480P 4 720 480p 31 50 60 00 27 03 SDTV 480P 5 1280 720 44 96 59 94 74 18 HDTV 720P 6 1280 720 45 00 60 00 74 25 HDTV 720P 7 1280 720 45 00 50 00 74 25 HDTV 720P 50Hz 8 1920 1080 28 13 50 00 74 25 HDTV 1080I 50Hz 9 1...

Page 8: ... 1080 33 71 29 97 79 12 HDTV 1080P 15 1920 1080 33 75 30 00 79 20 HDTV 1080P 16 1920 1080 67 43 59 94 148 35 HDTV 1080P 17 1920 1080 67 50 60 00 148 50 HDTV 1080P 18 3840 2160 53 95 23 98 297 00 UDTV 2160P UHD only 19 3840 2160 54 00 24 00 297 00 UDTV 2160P UHD only 20 3840 2160 56 25 25 00 297 00 UDTV 2160P UHD only 21 3840 2160 61 43 29 97 297 00 UDTV 2160P UHD only 22 3840 2160 67 50 30 00 297 ...

Page 9: ...osed Remarks 1 1280 720 37 50 50 74 25 HDTV 720P 2D to 3D Side by Side Top Bottom 2 1920 1080 28 13 50 74 25 HDTV 1080I 2D to 3D Side by Side Top Bottom 6 2 HDMI Input 6 3 HDMI1 4 2 0 3D supported mode manually No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remarks 1 720 480 31 469 31 5 62 938 63 59 94 59 94 60 27 00 27 03 SDTV 480P 2D to 3D Side by Side Half Top Bottom Checker Board ...

Page 10: ...Top and Bottom Side by side half Secondary HDTV 1080I Primary HDTV 1080I 28 12 50 00 148 50 20 Side by side Full HDTV 1080I 33 72 33 75 59 94 60 00 74 17 74 25 5 Top and Bottom Side by side half Secondary HDTV 1080I Primary HDTV 1080I 33 72 33 75 59 94 60 00 148 35 148 50 5 Side by side Full HDTV 1080I 56 25 50 00 148 50 20 Frame packing Primary HDTV 1080I HDTV 1080I 67 43 67 50 59 94 60 00 148 35...

Page 11: ...P 11 1920 1080 56 25 50 00 74 25 HDTV 1080P 12 1920 1080 26 97 23 97 74 18 HDTV 1080P 13 1920 1080 33 75 30 00 74 25 HDTV 1080P 14 1920 1080 33 71 29 97 74 18 HDTV 1080P 6 5 HDMI PC Input 3D 3D supported mode manually 6 6 Component Input 3D 3D supported mode manually No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remarks 1 1024 768 48 36 60 00 65 00 HDTV 768P 2D to 3D Side by Side hal...

Page 12: ...manually 6 9 USB DLNA 3D 3D supported mode automatically 6 10 Miracast Widi 3D supported mode manually Remark 3D Input mode No Resolution H freq kHz V freq Hz Pixel clock MHz 3D input proposed mode 1 Under 320x240 2D to 3D 2 Over 320x240 2D to 3D Side by Side Half Top Bottom No Resolution H freq kHz V freq Hz Pixel clock MHz 3D input proposed mode 1 1080p 33 75 30 00 74 25 Side by Side Half Top Bo...

Page 13: ...ion When still image is displayed for a period of 20 minutes or longer especially where W B scale is strong Digital pattern 13ch and or Cross hatch pattern 09ch there can some afterimage in the black level area 3 Adjustment items 3 1 Main PCBA Adjustments MAC Address Download ADC adjustment 480i Comp1 1920 1080 Comp1 EDID DDC download Above adjustment items can be also performed in Final Assembly ...

Page 14: ... 4 remove LAN CABLE 4 5 Model name Serial number Download 4 5 1 Model name Serial number D L Press P ONLY key of service remocon Baud rate 115200 bps Connect RS 232C Signal to USB Cable to USB Write Serial number by use USB port Must check the serial number at Instart menu 4 5 2 Method notice 1 Serial number D L is using of scan equipment 2 Setting of scan equipment operated by Manufacturing Techn...

Page 15: ... ID ⓑ Serial No Controlled on production line ⓒ Month Year Controlled on production line ex Monthly 01 01 Year 2015 19 ⓓ Model Name Hex LGTV ⓔ Checksum LG TV Changeable by total EDID data ⓕ Vendor Specific HDMI 5 2 4 1 EDID DTS HDMI1 C S 0xA0 0xE5 HDMI UHD Deep On Case EDID Block 0 Bytes 0 127 EDID Block 1 Bytes 128 255 EDID Block 0 Bytes 0 127 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 00 FF FF FF FF FF ...

Page 16: ... 62 63 64 23 09 57 07 7C 03 0C 00 10 00 B8 3C 20 20 C0 8E 01 02 03 04 01 4F 00 FE 08 10 06 10 18 10 30 28 10 38 10 E3 0E 61 66 01 1D 80 18 71 1C 16 20 40 58 2C 25 00 40 84 63 00 00 9E 01 1D 00 72 51 D0 50 1E 20 6E 28 55 00 40 84 63 00 00 1E 00 00 00 00 60 00 00 00 00 00 0 00 00 00 00 00 00 00 00 00 00 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 62 EDID Block 0 Bytes 0 127 0 1 2 3 4 5 6 7 8 9 A...

Page 17: ...9 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26 20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80 30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30 50 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 E6 EDID Block 1 Bytes 128 255 0 1 2 3 4 5 6 7 8 9 A B...

Page 18: ...hts reserved Only for training and service purposes AC3 HDMI1 C S E6 7B _3G_UHD Deep Color OFF AC3 HDMI2 C S E6 6B _3G_UHD Deep Color OFF AC3 HDMI3 C S E6 5B _3G_UHD Deep Color OFF PCM HDMI1 C S A0 60 _6G_UHD Deep Color ON PCM HDMI2 C S A0 50 _6G_UHD Deep Color ON ...

Page 19: ... _6G_UHD Deep Color ON TBD PCM HDMI1 C S E6 ED _3G_UHD Deep Color OFF PCM HDMI2 C S E6 DD _3G_UHD Deep Color OFF PCM HDMI3 C S E6 CD _3G_UHD Deep Color OFF Checksum HDMI 1 2 3 DTS AC3 PCM 3D 3G 6G 3G 6G 3G 6G HDMI1 E6 72 A0 E5 E6 7B A0 EE E6 ED A0 60 HDMI2 E6 62 A0 D5 E6 6B A0 DE E6 DD A0 50 HDMI3 E6 52 A0 C5 E6 5B A0 CE E6 CD A0 40 ...

Page 20: ...tion and cautionary items 1 Lighting condition in surrounding area surrounding lighting should be lower 10 lux Try to isolate adj area into dark surrounding 2 Probe location Color Analyzer CA 210 probe should be within 10cm and perpendicular of the module surface 80 100 3 Aging time 1 After Aging Start Keep the Power ON status during 5 Minutes 2 In case of LCD Back light on should be checked using...

Page 21: ...t data and decrease the others Adjustment mode mode Warm 5 3 7 Reference White Balance Adj coordinate and color temperature 1 Luminance 204 Gray 80IRE 2 Standard color coordinate and temperature using CS 1000 over 26 inch 5 3 8 Reference White Balance Adj coordinate and color temperature Luminance 204 Gray Standard color coordinate and temperature using CS 1000 over 26 inch Mode Coordinate Temp uv...

Page 22: ...y option select US CA MX Selection is done using or KEY 5 7 HDMI ARC Function Inspection 5 7 1 Test equipment Optic Receiver Speaker MSHG 600 SW 1220 HDMI Cable for 1 4 version 5 7 2 Test method 1 Insert the HDMI Cable to the HDMI ARC port from the master equipment HDMI2 2 Check the sound from the TV Set 3 Check the Sound from the Speaker or using AV Optic TEST program It s connected to MSHG 600 5...

Page 23: ...O output check No Item Min Typ Max Unit Remark 1 Audio practical max Output L R Distortion 10 max Output 9 10 12 W EQ Off AVL Off Clear Voice Off 6 07 8 10 10 8 Vrms 2 Speaker 8Ω Impedance 9 10 12 W EQ On AVL On Clear Voice On Measurement condition 1 RF input Mono 1KHz sine wave signal 100 Modulation 2 CVBS Component 1KHz sine wave signal 0 4Vrms 8 USB S W Download optional Service only 1 Put the ...

Page 24: ... 24 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes BLOCK DIAGRAM 1 LM14A URSA9 Circuit Block Diagram ...

Page 25: ... 25 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 2 LM14A URSA11 I2C Block Diagram ...

Page 26: ... 26 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 3 URSA11 Block Diagram ...

Page 27: ... 27 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 4 LM14A URSA11 Power Block Diagram ...

Page 28: ... 28 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 5 Tuner CI Block Diagram ...

Page 29: ... 29 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 6 Video Audio In Block Diagram ...

Page 30: ... 30 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 7 Audio Out Block Diagram ...

Page 31: ... 31 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 8 HDMI ...

Page 32: ... 32 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 9 USB WIFI M REMOTE UART ...

Page 33: ... 33 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes 10 LM14A URSA11 Internal Block ...

Page 34: ...ics These parts are identified by in the Schematic Diagram and 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 A10 A22 AG1 900 401 710 811 500 400 200 531 530 821 820 121 120 540 8...

Page 35: ...r auto on off 7 8 C Audio error No audio Normal video 8 9 Wrecked audio discontinuation noise 9 10 D Function error Remote control Local switch checking 10 MR13 operating checking 11 11 12 Wifi operating checking 12 13 Camera 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 t...

Page 36: ...d 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 LCD TV Error symptom A Video error No video Normal audio A9 A1 A9 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS Cable Speaker...

Page 37: ...eplace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A9 Established date Revised date 2 16 LCD TV Error symptom 2 2013 01 31 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 38: ... Normal Picture Y N Y Close Y Close By using Digital signal level meter By using Diagnostics menu on OSD Setting Quick Setting Programmes Programme 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 Established date Revis...

Page 39: ...ternal 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 A7 Standard Repair Process Established date Revised date 4 16 LCD TV Error symptom 4 2013 01 31 Copyright 2015 LG Electronics Inc All rights reserv...

Page 40: ... 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 41: ...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 A8 A9 A9 A9 Standard Repair Process Established date Revised date 6 16 LCD TV Error symptom 6 Stand By Red or Turn On Operating Turn Off Close 2013 01 31 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service...

Page 42: ...y REMOTE CONTROL POWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by 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...

Page 43: ...pair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A11 A12 A9 Disconnection Established date Revised date 8 16 LCD TV Error symptom Standard Repair Process 8 2013 01 31 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 44: ... 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 24V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D N End Established...

Page 45: ...ss the wheel Is show ok message Close N N N Y Replace MR15 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 M4 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 A14 A4 A4 Copyright 2...

Page 46: ... of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A13 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 A9 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A13 Replace Main B D Y A13 Standard Repair Process Established date Revised date 10 16 LCD TV Error symptom 10 Y 20...

Page 47: ... N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 12 16 LCD TV Error symptom 12 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A15 A4 A4 A15 2013 01 31 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 48: ... 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 LCD TV Error symptom Standard Repair Process 14 2013 01 31 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 49: ...tion 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 15 16 LCD TV Error symptom Stand...

Page 50: ...e controller Remote controller damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 16 16 LCD TV Error symptom Standard Repair Process 16 2013 01 31 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 51: ...ing method A3 4 LCD TV Version checking method A4 5 Tuner Checking Part A5 6 A Video error _Vertical Horizontal bar residual image light spot LCD TV connection diagram A6 7 A Video error_ Color error Check Link Cable EPI reconnection condition A7 8 Appendix Defected Type caused by T Con Inverter Module Exchange Module 1 A 1 2 Exchange Module 2 A 2 2 Continue to the next page Copyright 2015 LG Elec...

Page 52: ... Audio error_ No audio Normal video Checking method in menu when there is no audio A11 13 Voltage and speaker checking method when there is no audio A12 14 D Function error Remote controller operation checking method A13 15 Motion Remote operation checking method A14 16 Wifi operation checking method A15 17 E Etc Tool option changing method A16 Continued from previous page Copyright 2015 LG Electr...

Page 53: ...ck LCD back light with naked eye A Video error_No video Normal audio LCD TV A1 2014 12 31 After Remove the Rear Cover turning on the power and check with the naked eye Whether you can see video Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 54: ... TV A2 2014 12 31 Entry method 1 Press the ADJ button on the remote controller for adjustment 2 Enter into White Balance of item 10 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 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 55: ...o lag stop A3 Established date Revised date Error symptom Content LCD TV A3 2014 12 31 Quick Settings Programmes Programme Tunning Manual Tuning When the signal is strong use the attenuator 10dB 15dB 20dB etc Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 56: ...top 1 Checking method for remote controller for adjustment Version A4 Established date Revised date Error symptom Content LCD TV A4 2014 12 31 Press the IN START with the remote controller for adjustment Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 57: ...ymptom Content LCD TV A5 2014 12 31 Checking method 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 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 58: ...tal bar residual image light spot A6 Established date Revised date Error symptom Content LCD TV A6 2014 12 31 As the part connecting to the external input check the screen condition by signal Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 59: ... Video error_Color error A7 Established date Revised date Error symptom Content LCD TV A7 2014 12 31 Check the contact condition of the Link Cable especially dust or mis insertion Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 60: ...l display Line Dim Crosstalk Crosstalk Press damage Brightness difference Burnt Un repairable Cases In this case please exchange the module Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 61: ...please exchange the module Angle view Color difference Brightness dot noise Half dead Green Noise on power on off time Line Defect Mura Brightness difference Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 62: ...go B Power error _No power A17 Established date Revised date Error symptom Content LCD TV A8 2014 12 31 ST BY condition On or Off Power ON condition Turn Off Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 63: ...er LCD TV A9 2014 12 31 24Pin Power Board Main Board 1 PWR ON 2 INV CTL 3 DPC 4 PDIM 2 5 3 5V 6 GND 7 3 5V 8 3 5V 9 GND 10 GND 11 12V 12 12V 13 12V 14 12V 15 12V 16 GND 17 GND 18 12V_ON 19 24V 20 24V 21 24V 22 24V 23 GND 24 GND Check the DC 24V 12V 3 5V Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 64: ...iewing A19 Established date Revised date Error symptom Content LCD TV A10 2014 12 31 Entry method 1 Press the IN START button of the remote controller for adjustment 2 Check the entry into adjustment item 3 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 65: ...stablished date Revised date Error symptom Content LCD TV A11 2015 12 31 Checking method 1 Press the Setting button on the remote controller 2 Select the Sound function of the Menu 3 Select the Sound Out 4 Select TV Speaker Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 66: ...7 GND 18 12V_ON 19 24V 20 24V 21 24V 22 24V 23 GND 24 GND Checking order when there is no audio Check the contact condition of or 24V connector of Main Board Measure the 24V input voltage supplied from Power Board If there is no input voltage remove and check the connector Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal ...

Page 67: ...D 6 LOGO_LIGHT 7 IR 8 GND 9 EYE_SCL 10 EYE_SDA Checking order 1 2 Check IR cable condition between IR Main board 3 Check the st by 3 5V on the terminal 4 4 When checking the Pre Amp when the power is in ON condition it is normal when the Analog Tester needle moves slowly and defective when it does not move at all Copyright 2015 LG Electronics Inc All rights reserved Only for training and service p...

Page 68: ..._SCL 10 EYE_SDA P4101 1 GND 2 M_RFModule_RESET 3 NOT USE 4 WOL WIFI_POWER_ON 5 GND 6 WIFI_DP 7 WIFI_DM 8 3 5V_WIFI Checking order 1 Check IR cable condition between IR Main board 2 Check WIFI Combo cable condition between WIFI Combo Assy Main board 3 Check the st by 3 5V P4100 on the terminal 4 4 Check the 3 5V_WIFI P4101 on the terminal 8 Copyright 2015 LG Electronics Inc All rights reserved Only...

Page 69: ...Function error 2014 12 31 P4101 1 GND 2 M_RFModule_RESET 3 NOT USE 4 WOL WIFI_POWER_ON 5 GND 6 WIFI_DP 7 WIFI_DM 8 3 5V_WIFI Checking order 1 2 Check Wifi cable condition between Wifi assy Main board 3 Check the 3 3V on the terminal 8 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...