Internal Use Only North/Latin America Europe/Africa Asia/Oceania http://aic.lgservice.com http://eic.lgservice.com http://biz.lgservice.com LED TV SERVICE MANUAL CHASSIS : LD34N MODEL: 55LA970V/W/9 55LA970V/W/9-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS CONTENTS . ............................................................................................. 2 SAFETY PRECAUTIONS ......................................................................... 3 SERVICING PRECAUTIONS..................................................................... 4 SPECIFICATION........................................................................................ 6 ADJUSTMENT INSTRUCTION...............................................................
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 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.
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First. General Servicing Precautions 1.
IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above. Removal 1.
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to the LED TV used LD34N chassis. 3. Test method 1) Performance: LGE TV test method followed 2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC - Wireless : Wireless HD Specification (Option) 2. Requirement for Test Each part is tested as below without special appointment.
No.
5. External input format 5.1. 2D Mode (1) Component input(Y, CB/PB, CR/PR) No. Resolution H-freq(kHz) V-freq(Hz) 1. 720×480 15.73 60.00 SDTV, DVD 480i 2. 720×480 15.63 59.94 SDTV, DVD 480i 3. 720×480 31.47 59.94 480p 4. 720×480 31.50 60.00 480p 5. 720×576 15.625 50.00 SDTV 576i 6. 720×576 31.25 50.00 SDTV 576p 7. 1280×720 45.00 50.00 HDTV 720p 8. 1280×720 44.96 59.94 HDTV 720p 9. 1280×720 45.00 60.00 HDTV 720p 10. 1920×1080 31.25 50.00 HDTV 1080i 11.
5.2. 3D Mode (1) RF Input(3D supported mode manually) No. Resolution Proposed 1 HD - DTV 1080I 720P SD - DTV 576P 576I 2 3 3D input proposed mode 2D to 3D Side by Side(Half) Top & Bottom SD - ATV(CVBS/SCART) (2) RF Input(3D supported mode automatically) No. Signal 1 Frame Compatible 3D input proposed mode Side by Side(Half), Top & Bottom (3) HDMI 1.3 (3D supported mode manually) No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 1 720*480 31.5 60 27.
(4) HDMI 1.4b (3D supported mode automatically) No. Resolution 1 H-freq(kHz) V-freq.
(5) HDMI-PC Input (3D) (3D supported mode manually) No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode Proposed 1 1024*768 48.36 60 65 2D to 3D, Side by Side(half) Top & Bottom HDTV 768P 2 1360*768 47.71 60 85.5 2D to 3D, Side by Side(half) Top & Bottom HDTV 768P HDTV 1080P 3 1920*1080 67.500 60 148.50 2D to 3D, Side by Side(half) Top & Bottom, Checker Board, Single Frame Sequential, Row Interleaving, Column Interleaving 4 3840*2160 54 56.25 67.
(8) USB, DLNA -Photo (3D) (3D supported mode manually) 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 (9) USB, DLNA (3D) (3D supported mode automatically) No. 1 Resolution H-freq(kHz) 1080p 33.75 V-freq.(Hz) Pixel clock(MHz) 30 3D input proposed mode Side by Side(Half), Top & Bottom, Checker Board, MPO(Photo), JPS(Photo) 74.
ADJUSTMENT INSTRUCTION 1. Application Range 3.1.3. Adjustment (1) Adjustment method - U sing RS-232, adjust items in the other shown in "3.1.3.3)" This specification sheet is applied to all of the LED TV with LD34N chassis. (2) Adj. protocol 2. Designation Protocol (1) Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation transformer will help protect test instrument. (2) Adjustment must be done in the correct order.
3.3. LAN Inspection 3.4. LAN PORT INSPECTION(PING TEST) Connect SET → LAN port == PC → LAN Port 3.3.1. Equipment & Condition SET ▪ Each other connection to LAN Port of IP Hub and Jig PC 3.4.1. Equipment setting (1) Play the LAN Port Test PROGRAM. (2) Input IP set up for an inspection to Test Program. *IP Number : 12.12.2.2 3.4.2. LAN PORT inspection(PING TEST) 3.3.2.
3.5. Model name & Serial number Download 2) Check the key download for transmitted command (RS232: ci 00 10) 3.5.1. Model name & Serial number D/L Press "Power on" key of service remote control. (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. ▪ CMD 1 CMD 2 C I Data 0 1 0 3) Result value - Normally status for download : OKx - Abnormally status for download : NGx 3.5.2.
4. Manual Adjustment * ADC adjustment is not needed because of OTP(Auto ADC adjustment) ⓓ Model Name(Hex): LGTV Cf) TV set’s model name in EDID data is below. MODEL NAME MODEL NAME(HEX) LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV) 4.1. EDID(The Extended Display Identification Data)/DDC(Display Data Channel) download ⓔ Checksum(LG TV): Changeable by total EDID data. 4.1.1. Overview FHD EDID C/S data It is a VESA regulation.
4.2.4.
4.2.6. Adj. method How to adjust 1. I f G gain is adjusted over 172 and R gain and B gain less than 192 , Adjust is O.K. 2. I f G gain is less than 172 , increase G gain by up to 172, and then increase R gain and B gain same amount of increasing G gain. 3. I f R gain or B gain is over 255 , Readjust G gain less than 172, Conform to R gain is 255 or B gain is 255 (1) Auto adj. method 1) Set TV in adj. mode using POWER ON key. 2) Zero calibrate probe then place it on the center of the Display.
4.2.8. EDGE LED White balance table (1) EDGE LED module change color coordinate because of aging time. (2) Apply under the color coordinate table, for compensated aging time.
4.6. Wi-Fi Test 4.8. Inspection of light scattering Step 1) Turn on TV Step 2) Select Network Connection option in Network Menu. ▪ Test Method Step 3) Select Start Connection button in Network Connection. (1) Push “Power only” key. (2) Push “HDMI” hot key. (3) Inspect whether light scattering is occurred in internal black pattern or not. (4) Push “Power only” key. 4.9. Option selection per country Step 4) If the system finds any AP like blow PIC, it is working well. 4.9.1.
4.11. HDMI ARC Function Inspection 4.14. GND and Internal Pressure check (1) Test equipment - Optic Receiver Speaker - MSHG-600 (SW: 1220 ↑) - HDMI Cable (for 1.4 version) 4.14.1. Method (1) GND & Internal Pressure auto-check preparation - Check that Power cord is fully inserted to the SET.
6. USB S/W Download(Service only) (1) Put the USB Stick to the USB socket. (2) Automatically detecting update file in USB Stick. - If your downloaded program version in USB Stick is Low, it didn't work. But your downloaded version is High, USB data is automatically detecting.(Download Version High & Power only mode, Set is automatically Download) (3) Show the message "Copying files from memory". (4) Updating is starting. (5) Updating Completed, The TV will restart automatically.
EXPLODED VIEW IMPORTANT SAFETY NOTICE Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes Dual Play AT1 AG2 * Set + Stand AG1 A7 - 23 - (Option) A2 200 A22 201D 510 200D A10 530 CAM1 121 LV1 541 LV2 540 900 521 120 310 410 400 700 710 Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and EXPLODED VIEW.