Sharp LC-26D43U Service Manual page 30

LC-26D43U
TROUBLESHOOTING TABLE
No video output from extermal input <<INPUT-1>>
Is INPUT-1 selected on the input switching menu screen?
Yes
Is video signal fed to pin 21 of IC501 (AV SWITCH)?
Yes
Is video signal sent to pin 60 of IC501?
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.
<Component video signal input> No video output (1)
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 J507 and pin 38 of IC501.
No
Check between J507 and pin 21 of IC501.
No
Check IC501 (AV SWITCH) and peripheral circuits.
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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Yes