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LED TV
SERVICE MANUAL
CHASSIS : LD33B
MODEL : 55LA74** 55LA74**-Z*
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67727119 (1302-REV00) Printed in Korea
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CONTENTS CONTENTS .............................................................................................. 2 SAFETY PRECAUTIONS ........................................................................ 3 SERVICING PRECAUTIONS .................................................................... 4 SPECIFICATION ....................................................................................... 6 ADJUSTMENT INSTRUCTION .............................................................. 14 BLO
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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. General Guidance Leakage Current Hot Check
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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. following servicing precautions and any
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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. When holes are the slotted type, the following technique prevent excessive component temperatures. should be used to remove and replace the IC. When working with boards using the familiar r
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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 LED TV used LD33B 1) Performance: LGE TV test method followed chassis. 2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC 2. Requirement for Test Each part is tested as below without special appointment. 1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C 2) Relative Humidity: 65 %
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No. Item Specification Remarks 1) PAL-BG 2) PAL-DK 3) PAL-I/I’ 4) SECAM-L/L', DK , BG, I 2 Broadcasting system 5) DVB-T Model : *L*V*-Z* (T2 only Model) 6) DVB-C 7) DVB-T2 8) DVB-S/S2 DVB-S: Satellite 1 ) Digital TV - VHF, UHF - C-Band,Ku-Band 2) Analogue TV 3 Program coverage - VHF : E2 to E12 - UHF : E21 to E69 - CATV : S1 to S20 - HYPER : S21 to S47 ► DVB-T - Guard Interval(Bitrate_Mbit/s) 1/4, 1/8, 1/16, 1/32 - Modulation : Code Rate QPSK : 1/2, 2/3, 3/4, 5/6, 7/8 16-QAM : 1/2, 2
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5. Component Video Input (Y, Pb, Pr) No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock 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. 1920×1080 33.75 60.00 HDTV 1080i 12. 1920×1080 33.72 59.94 HDTV 1080i 1
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6. HDMI Input 6.1. DTV mode No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 1. 640*480 31.469 / 31.5 59.94/60 SDTV 480P 2. 720*480 31.469 / 31.5 59.94 / 60 SDTV 480P 3. 720*576 31.25 50 SDTV 576P 4. 720*576 15.625 50 SDTV 576I 5. 1280*720 37.500 50 HDTV 720P 6. 1280*720 44.96 / 45 59.94 / 60 HDTV 720P 7. 1920*1080 33.72 / 33.75 59.94 / 60 HDTV 1080I 8. 1920*1080 28.125 50.00 HDTV 1080I 9. 1920*1080 26.97 / 27 23.97 / 24 HDTV 1080P 10. 1920*1080 25 HDTV 1080P 11. 1920*1080 33.716 / 33.75
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7. 3D Mode 7.1. HDMI 1.4b (3D supported mode automatically) No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) VIC 3D input proposed mode Proposed Top-and-Bottom Secondary(SDTV 480P) 1 31.469 / 31.5 59.94/ 60 25.125 1 Side-by-side(half) Secondary(SDTV 480P) 640*480 Frame packing Secondary(SDTV 480P) 2 62.938/63 59.94/ 60 50.35/50.4 1 Line alternative (SDTV 480P) 3 31.469 / 31.5 59.94/ 60 50.35/50.4 1 Side-by-side(Full) (SDTV 480P) Top-and-Bottom Secondary(SDTV 480P) 4 31.469 / 31.5 59.94 /
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7.2. HDMI Input(1.3) No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed 3D input proposed mode 1 1280*720 45.00 60.00 74.25 HDTV 720P 2D to 3D, Side by Side(half), Top & Bottom, Single Frame Sequential 2 1280*720 37.500 50 74.25 HDTV 720P 3 1920*1080 33.75 60.00 74.25 HDTV 1080I 2D to 3D, Side by Side(half), Top & Bottom 4 1920*1080 28.125 50.00 74.25 HDTV 1080I 5 1920*1080 27.00 24.00 74.25 HDTV 1080P 2D to 3D, Side by Side(Half), 6 1920*1080 28.12 25 74.25 HDTV 1080P Top & Botto
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7.6. HDMI-PC Input (3D supported mode manually) No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode Proposed 2D to 3D, Side by Side(half) 1 1024*768 48.36 60 65 HDTV 768P Top & Bottom 2D to 3D, Side by Side(half) 2 1360*768 47.71 60 85.5 HDTV 768P Top & Bottom 2D to 3D, Side by Side(half) Top & Bottom, Checker Board, 3 1920*1080 67.500 60 148.50 Single Frame Sequential, HDTV 1080P Row Interleaving, Column Interleaving 640*350 720*400 4 Others - - - 2D to 3D 640*480 800
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ADJUSTMENT INSTRUCTION 3.2. LAN Inspection 1. Application Range This specification sheet is applied to all of the LED TV with 3.2.1. Equipment & Condition LD33B chassis. ▪ Each other connection to LAN Port of IP Hub and Jig 2. Designation (1) B ecause 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) The adjustment must be performed
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3.2.3. WIDEVINE key Inspection 3.4. Model name & Serial number Download - Confirm key input data at the "IN START" MENU Mode. 3.4.1. Model name & Serial number D/L ▪ Press "P-ONLY" 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. 3.4.2. Method & notice (1) Serial number D/L is using of scan equipment. (2) Setting of scan equipment operated by Manufacturing
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3.5.1. Check the method of CI+ Key value 4. Manual Adjustment (1) Check the method on Instart menu * A DC adjustment is not needed because of OTP(Auto ADC (2) Check the method of RS232C Command adjustment) 1) Into the main ass’y mode(RS232: aa 00 00) CMD 1 CMD 2 Data 0 4.1. EDID DATA A A 0 0 4.1.1. 3D EDID 2) Check the key download for transmitted command (RS232: ci 00 10) CMD 1 CMD 2 Data 0 C I 1 0 3) Result value - Normally status for download : OKx - Abnormally status for download : NGx
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4.1.2. 2D EDID 4.2.3. Equipment connection MAP Color Analyze r RS-232C Probe Compute r RS-232C RS-232C Pattern Generat or Signal Source * If TV internal pattern is used, not needed ▪ Reference 4.2.4. Adj. Command (Protocol) - HDMI1 ~ HDMI4 / RGB START 6E A 50 A LEN A 03 A CMD A 00 A VAL A CS STOP - In the data of EDID, bellows may be different by S/W or Input mode. - LEN: Number of Data Byte to be sent ⓐ Product ID - CMD: Command HEX EDID Table DDC Function - VAL: FOS Dat
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▪ Standard color coordinate and temperature using CA-210(CH 14) 4.2.5. Adj. method (1) Auto adj. method Coordinate Mode Temp ∆uv 1) Set TV in adj. mode using POWER ON key. x y 2) Z ero calibrate probe then place it on the center of the Cool 0.269 ± 0.002 0.273 ± 0.002 13000 K 0.0000 Display. 3) Connect Cable.(RS-232C to USB) Medium 0.285 ± 0.002 0.293 ± 0.002 9300 K 0.0000 4) Select mode in adj. Program and begin adj. Warm 0.313 ± 0.002 0.329 ± 0.002 6500K 0.0000 5) When adj. is complete (
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(2) When 3D OSD appear automatically, then select OK key. 4.3. Local Dimming Function Check Step 1) Turn on TV. Step 2) At the Local Dimming mode, module Edge Backlight moving right to left Back light of IOP module moving. Step 3) Confirm the Local Dimming mode. Step 4) Press "exit" key. (3) Don't wear a 3D Glasses, check the picture like below. 4.6. Wi-Fi Test Step 1) Turn on TV 4.4. Magic Motion Remote control test Step 2) Select Network Connection option in Network Menu. - Results are auto
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4.7. LNB voltage and 22KHz tone check 7. GND and Internal Pressure check (only for DVB-S/S2 model) 7.1. Method ▪ Test method (1) GND & Internal Pressure auto-check preparation (1) Set TV in Adj. mode using POWER ON. - Check that Power cord is fully inserted to the SET . (2) Connect cable between satellite ANT and test JIG. (If loose, re-insert) (3) Press Yellow key(ETC+SWAP) in Adj Remote control to (2) Perform GND & Internal Pressure auto-check make LNB on. - Unit fully inserted Power cord
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9. USB S/W Download(Service only) (1) Put the USB Stick to the USB socket (2) Automatically detecting update file in USB Stick - I f your downloaded program version in USB Stick is Lower, it didn’t work. B ut your downloaded version is Higher, USB data is automatically detecting (Download Version High & Power only mode, Set is automatically Download) (3) Show the message “Do not unplug!” (4) Updating is starting. (5) Updating Completed, The TV will restart automatically (6) I f your TV is tu
