LG OLED55B7P Service Manual

Oled tv

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Safety and reference (38 pages)

Owner's manual (65 pages)

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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: Table Of Contents
CONTENTS CONTENTS ....................2 SAFETY PRECAUTIONS ................ 3 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 SOFTWARE UPDATE ................9 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 16 DISASSEMBLY GUIDE ................17 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 -...
Page 3: Safety Precautions
SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many 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.
Page 4: Servicing Precautions
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or expo- NOTE: If unforeseen circumstances create conflict between the sure of the assembly.
Page 5 IC Remove/Replacement 3. Solder the connections. Some chassis circuit boards have slotted holes (oblong) through CAUTION: Maintain original spacing between the replaced which the IC leads are inserted and then bent flat against the cir- component and adjacent components and the circuit board to cuit foil.
Page 6: Specification
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range 3. Test method This specification is applied to the OLED TV used EA71E (1) Performance: LGE TV test method followed chassis. (2) Demanded other specification - Safety : UL, CSA, CE, IEC specification - EMC : FCC, ICES, CE, IEC specification 2.
Page 7 5. External Input Support Format 5.1. HDMI Input (PC/DTV) Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed HDMI-PC 640*350 31.46 70.09 25.17 720*400 31.46 70.08 28.32 640*480 31.46 59.94 25.17 VESA(VGA) 800*600 37.87 60.31 VESA(SVGA) 1024*768 48.36 60.00 VESA(XGA) 1360*768 47.71 60.01 84.75 VESA(WXGA) 1152*864...
Page 8 Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed 640*480 31.46 59.94 25.12 SDTV 480P 640*480 31.5 60.00 25.12 SDTV 480P 720*480 15.73 59.94 13.50 SDTV, DVD 480I(525I) Spec. out but display 720*480 15.75 60.00 13.51 SDTV, DVD 480I(525I) 720*576 15.62 50.00 13.50 SDTV, DVD 576I(625I) 50Hz 720*480...
Page 9: Software Update
SOFTWARE UPDATE 1. USB 2. NSU (1) Insert the USB memory Stick to the USB port (This Function is needed to connect to the internet) (2) Automatically detect the SW Version and show the below message (1) Menu -> All Settings -> General -> About This TV (3) Click [YES]: initiate the download and install of the update.
Page 10: Block Diagram
BLOCK DIAGRAM 1. SOC - 10 -...
Page 11 2. Tuner + CI - 11 -...
Page 12 3. Video & Audio IN/OUT - 12 -...
Page 13 4. HDMI 2.0 - 13 -...
Page 14 5. USB / Wi-Fi / M-Remote / UART - 14 -...
Page 15 6. I2C Map - 15 -...
Page 16: Exploded View
EXPLODED VIEW IMPORTANT SAFETY NOTICE Many 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.
Page 17: Disassembly Guide
DISASSEMBLY GUIDE ① Put the set on the flat pad. ② Remove Rear Small Cover Pull up bottom of Rear Small Cover to remove. - 17 -...
Page 18 ③ Remove Stand Screw and Stand FAB30016103 (M4*12mm), 4EA Remove Screw 4EA first, next remove Stand ④ Remove Back Cover Screw ⑤ Remove PowerCord Bracket Pull up Power Cord, than remove FAB31843216 (M3*5.5mm, Gray) 9EA Bracket, next remove cord from PSU. ...
Page 19 ⑥ Remove Back Cover Pull up bottom of Back Cover to remove. - 19 -...
Page 20 TROUBLE SHOOTING GUIDE...
Page 21 Contents of Standard Repair Process Error symptom (High category) Error symptom (Mid category) Page Remarks No video/Normal audio No video/No audio Picture broken/ Freezing A. Video error Color error Vertical/Horizontal bar, residual image, light spot, external device color error No power B.
Page 22 Standard Repair Process Established A. Video error Error date symptom No video/ Normal audio Revised date 1/15 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, Vx1 Cable, Speaker Cable, IR B/D Cable,,,) ☞A1 ☞A9 No video...
Page 23 Standard Repair Process Established A. Video error Error date symptom No video/ No audio Revised date 2/15 ☞A9 Check various voltages Check and Normal of Power Board (Main) No Video/ replace voltage? (20V, 12V…) No audio MAIN B/D Replace Power Board and repair parts...
Page 24 Standard Repair Process Established A. Video error Error date symptom Picture broken/ Freezing Revised date 3/15 . By using Digital signal level meter ☞ A3 . By using Diagnostics menu on OSD ( All Settings→ Channels → Channel Tuning → Manual Tuning → Check the Signal ) Check RF Signal level - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%)
Page 25 Standard Repair Process Established A. Video error Error date symptom Color error Revised date 4/15 ☞ A7 ☞A6 ※ Check Check color by input and replace -External Input Link Cable Color Color Color Replace module Replace Main B/D error? (V by one) error? error? -HDMI...
Page 26 Standard Repair Process A. Video error Established Error date symptom Vertical / Horizontal bar, residual image, Revised date 5/15 light spot, external device color error Vertical/Horizontal bar, residual image, light spot Replace Module ☞A6 ☞ A7 Check color condition by input Check external Check and -External Input...
Page 27 Standard Repair Process Established B. Power error Error date symptom No power Revised date 6/15 ☞A8 ☞A9 DC Power on Replace Check Power LED Normal Check Power by pressing Power Key Power On ‘”High” Logo LED operation? On Remote control .
Page 28 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date 7/15 Check outlet ☞A10 Check Power Off Check A/C cord Error? Normal? Replace Main B/D Mode Abnormal Check for all 2- phase Abnormal Replace Power B/D power out...
Page 29 Standard Repair Process Established C. Audio error Error date symptom No audio/ Normal video Revised date 8/15 ☞A11 ☞A12+A9 Check user Check audio B+ No audio Normal menu > 20V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Disconnection...
Page 30 Standard Repair Process Established C. Audio error Error date symptom Wrecked audio/ discontinuation/noise Revised date 9/15 → abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio ☞A12+A9 Wrecked audio/ Check and replace Check audio Discontinuation/ speaker and B+ Voltage (20V) Noise for connector...
Page 31 Standard Repair Process D. Function error Established Error date symptom Remote control & Local switch checking Revised date 10/15 1. Remote control(R/C) operating error Replace Main B/D ☞A13 ☞A13 ☞A13 Check & Repair Check B+ Check R/C itself Normal Normal Normal Check IR Normal...
Page 32 Standard Repair Process D. Function error Established Error date symptom MR15RA operating checking Revised date 11/15 2. MR15RA (Magic Remocon) operating error ☞A4 Check the RF Receiver ver Check MR15RA Normal Turn off/on the Press the Is show ok is “00.00”? INSTART menu operating? itself Operation...
Page 33 Standard Repair Process D. Function error Established Error date symptom Wifi operating checking Revised date 12/15 3.Wifi operating error ☞A4 ☞A14 Check the Wi-Fi Mac value Check the Wifi wafer Normal Replace is “NG”? INSTART menu Voltage? 1pin Main B/D ☞A14 Check &...
Page 34 Standard Repair Process Established D. Function error Error date symptom External device recognition error Revised date 13/15 Check technical Check information Signal Technical External Input input Replace Main B/D input? - Fix information information? Recognition error signal - S/W Version HDMI/ Check and fix DVI, Optical...
Page 35 Standard Repair Process Established E. Noise Error date symptom Circuit noise, mechanical noise Revised date 14/15 Identify Check Circuit nose location of Replace PSU noise type noise Mechanical Check location of noise noise ※ When the nose is severe, replace the module ※...
Page 36 Standard Repair Process Established F. Exterior defect Error date symptom Exterior defect Revised date 15/15 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent...
Page 37 Contents of Standard Repair Process Detail Technical Manual Error symptom Content Page Remarks Check Vx1 lock A. Video error_ No video/Normal audio Check White Balance value TUNER input signal strength checking method A. Video error_ video error /Video lag/stop Version checking method Tuner Checking Part A.
Page 38 Contents of Standard Repair Process Detail Technical Manual Continued from previous page Error symptom Content Page Remarks Check front display LED B. Power error_ No power Check power input Voltage & ST-BY 3.5V B. Power error_Off when on, off POWER OFF MODE checking method while viewing Checking method in menu when there is no audio...
Page 39 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Content Check Vx1 lock date R7624 : 0[V] Check a voltage of R7624 after turn on the TV. If the voltage is low, Vx1 is locked.(OK)
Page 40 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Content Check White Balance value date Entry method 1. Press the ADJ button on the remote control for adjustment. 2. Enter into White Balance of item 12. 3.
Page 41 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised TUNER input signal strength checking method Content date All Settings  Channels  Channel Tuning  Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.)
Page 42 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised OLED TV Version checking method Content date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment...
Page 43 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised TUNER checking part Content date Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2.
Page 44 Standard Repair Process Detail Technical Manual Error A. Video error _Vertical/Horizontal bar, Established symptom residual image, light spot date Revised Content OLED TV Connection diagram date As the part connecting to the external input, check the screen condition by signal...
Page 45 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error symptom date Revised Content Check Link Cable (Vx1) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion.
Page 46 Appendix : Exchange Main Board (1) Solder defect, CNT Broken Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken T-Con Defect, CNT Broken 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...
Page 47 Appendix : Exchange Main Board (2) Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION A - 2/5...
Page 48 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 3/5...
Page 49 Appendix : Exchange the Module (1) Line Dim Brightness difference Vertical abnormal display Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Burnt A - 4/5...
Page 50 Appendix : Exchange the Module (2) Angle view Color difference Brightness dot noise Half dead Brightness difference Green Noise on power on/off time Line Defect Un-repairable Cases In this case please exchange the module. A - 5/5...
Page 51 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition: On or Off Power ON condition: Turn Off...
Page 52 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check power input voltage and ST-BY 3.5V date Check the DC 12VM line for ST-BY Voltage Power To Main B’d (ST-BY : 7.8V, Normal : 12V) P202 Power To Module P201...
Page 53 Standard Repair Process Detail Technical Manual Error Established B. Power error _Off when on, off whiling viewing symptom date Revised Content POWER OFF MODE checking method date Entry method 1. Press the IN-START button of the remote control for adjustment 2.
Page 54 Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video symptom date Revised Content Checking method in menu when there is no audio date Checking method 1. Press the Setting button on the remote control 2. Select the Sound function of the Menu 3.
Page 55 Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video symptom date Revised Voltage and speaker checking method Content date when there is no audio ① ② ② SPK_R-_FT SPK_R+_FT SPK_L-_FT SPK_L+_FT Checking order when there is no audio SPK_R-_CT SPK_R+_CT SPK_L-_CT...
Page 56 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date Pin name 3.5V_WIFI ① IR & EYE Sensor WIFI_DM_JACK WIFI_DP_JACK ② WOL/WIFI_POWER_ON 3.5V_WIFI COMBO_RESET_JACK BT_WAKEUP_DEVICE_JACK ① BT_WAKEUP_HOST_JACK EYE_SDA_JACK EYE_SDA_JACK IR_JACK LED_R_JACK +3.5V_ST...
Page 57 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Motion Remote operation checking method date ① Wifi & BT Front Pin name 3.5V_WIFI WIFI_DM_JACK WIFI_DP_JACK ② WOL/WIFI_POWER_ON 3.5V_WIFI COMBO_RESET_JACK BT_WAKEUP_DEVICE_JACK BT_WAKEUP_HOST_JACK Wifi & BT Rear EYE_SDA_JACK EYE_SDA_JACK IR_JACK...
Page 58 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error symptom date Revised Adjustment Test pattern Content date Press the P-ONLY  HDMI HOT  CH + or - You can view 11 types of patterns using the CH+ or - key Checking item : 1.

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LG OLED55B7P Service Manual

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