LC-42D43U
4 – 3
<Component video signal input> No video output (1)
No video output from external input <<INPUT-1>> Select INPUT-1 and the input signal on the input switching menu
screen.
Is INPUT-1 selected on the input switching menu screen? NO When INPUT-1 cannot be selected since the characters INPUT-1
on the menu screen are gray.
YES
Is the video signal detection function normal?
Check between J501 and pin 70 of IC501.
Is video signal fed to pin 65 of IC501 (AV SWITCH)? NO Check between J501 and pin 65 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.
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