Sharp LC46D43U Service Manual - Page 29

Check between IC501 and IC3301. Q2202, Q2210, etc.

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Page 29 highlights

No video output (2) No video output from external input Is INPUT-2 selected on the input switching menu screen? LC-42D43U Select INPUT-2 and the input signal on the input switching menu screen. NO When INPUT-2 cannot be selected since the characters INPUT-2 on the menu screen are gray. YES Is video signal fed to pin 71 of IC501 (AV SWITCH)? Is the video signal detection function normal? Check between J502 and pin 76 of IC501. NO Check between J502 and pin 71 of IC501. YES Is video signal sent to pin 60 of IC501? NO Check IC501 (AV SWITCH) and peripheral circuits. YES Is video signal sent to pin 2 of TERMINAL_UNIT connector (FC_SC501)? YES Is video signal fed to pin 2 of MAIN_UNIT connector (FC_SC1101)? YES Is video signal fed to pin K25 of IC8101 (Broadcom) via L.P.F. composed of Q2202 and Q2210? YES Are digital video (LVDS) signals sent from pins 37-42 and 45-48 of IC2602? Are digital video (COMOS) signal sent from IC8101 (DVODATA 0 ~ 23, DVOCLKO, DVODE, DVOHSYNC, DVOVSYNC)? YES Check LCD_CONTROL PWB. NO Check between IC501 and SC501. (Q501, Q502, etc.) NO Check the board-to-board cable "FC". NO Check between IC501 and IC3301. (Q2202, Q2210, etc.) NO Check IC2602 and peripheral circuits. NO Check IC8101 and peripheral circuits. 4 - 4

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LC-42D43U
4 – 4
<Component video signal input> No video output (2)
No video output from external input <<INPUT-2>>
Select INPUT-2 and the input signal on the input switching menu
screen.
Is INPUT-2 selected on the input switching menu screen?
NO
When INPUT-2 cannot be selected since the characters INPUT-2
on the menu screen are gray.
YES
Is the video signal detection function normal?
Check between J502 and pin 76 of IC501.
Is video signal fed to pin 71 of IC501 (AV SWITCH)?
NO
Check between J502 and pin 71 of IC501.
YES
Is video signal sent to pin 60 of IC501?
NO
Check IC501 (AV SWITCH) and peripheral circuits.
YES
Is video signal sent to pin 2 of TERMINAL_UNIT connector
(FC_SC501)?
NO
Check between IC501 and SC501. (Q501, Q502, etc.)
YES
Is video signal fed to pin 2 of MAIN_UNIT connector
(FC_SC1101)?
NO
Check the board-to-board cable “FC”.
YES
Is video signal fed to pin K25 of IC8101 (Broadcom) via L.P.F.
composed of Q2202 and Q2210?
NO
Check between IC501 and IC3301. (Q2202, Q2210, etc.)
YES
Are digital video (LVDS) signals sent from pins 37-42 and 45-48
of IC2602?
NO
Check IC2602 and peripheral circuits.
Are digital video (COMOS) signal sent from IC8101 (DVODATA 0
~ 23, DVOCLKO, DVODE, DVOHSYNC, DVOVSYNC)?
NO
Check IC8101 and peripheral circuits.
YES
Check LCD_CONTROL PWB.