Sharp LC-19SK24U Service Manual page 52

LC-19SK24U/U-W
LC-19SB24U/U-W
LC-19SB14U
LC-19D44U
TROUBLESHOOTING TABLE (Continued)
<Composite video signal/S-video signal input> No video output (INPUT2)
No video output from extermal input <<INPUT-2>>
Yes
<Composite video signal input>
Is video signal fed to pin 1 of IC503?
<S-video signal input>
Are Y and C signals fed to pins 3 and 5 of IC503
respectively?
Yes
<Composite video signal input>
Is video signal sent to pin 18 of P502?
<S-video signal input>
Are Y and C signals sent to pins 15 and 14 of P502
respectively?
Yes
Are signals from B16, A16, P22, P23, R22, R23, T22,
T23, U22, U23, V22, V23 of IC801 normal?
Yes
Check LCD_CONTROL PWB.
19K24U P18-57.indd 52
No
Select INPUT-2 and the input signal on the input switching
menu screen.
No
Check between J503 and pin 1 of IC503.
Check between J503 and pin 3 and 5 of IC503.
Check IC503 and peripheral circuits.
No
Check between IC503 and P502.(Q503,Q504)
No
Check IC801 and peripheral circuits.
52
2007-8-15 15:30:53