Sharp LC46D43U - Aquos - 720p LCD HDTV Service Manual page 28

LC-42D43U
<Component video signal input> No video output (1)
No video output from external input <<INPUT-1>>
Is INPUT-1 selected on the input switching menu screen?
Is video signal fed to pin 65 of IC501 (AV SWITCH)?
Is video signal sent to pin 60 of IC501?
Is video signal sent to pin 2 of TERMINAL_UNIT connector
(FC_SC501)?
Is video signal fed to pin 2 of MAIN_UNIT connector
(FC_SC1101)?
Is video signal fed to pin K25 of IC8101 (Broadcom) via L.P.F.
composed of Q2202 and Q2210?
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)?
Check LCD_CONTROL PWB.
YES
YES
YES
YES
YES
YES
YES
Select INPUT-1 and the input signal on the input switching menu
screen.
NO When INPUT-1 cannot be selected since the characters INPUT-1
on the menu screen are gray.
Is the video signal detection function normal?
Check between J501 and pin 70 of IC501.
NO Check between J501 and pin 65 of IC501.
NO Check IC501 (AV SWITCH) and peripheral circuits.
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.
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