Sharp LC-19SK24U Service Manual page 51

No video output from extermal input <<INPUT-1>>
Is video signal fed to pins 16, 11 and 8 of IC502?
Is video signal out from pins 3,5 and 6 of IC502?
Is video signal fed to pins J2, L1 and R1 via L.P.F.
composed of Q506, Q507 and Q508?
Are signals from B16, A16, P22, P23, R22, R23, T22,
T23, U22, U23, V22, V23 of IC801 normal?
Check LCD_CONTROL PWB.
19K24U P18-57.indd 51
TROUBLESHOOTING TABLE (Continued)
<Component video signal input> No video output (INPUT-1)
Yes
Yes
Yes
Yes
Yes
Select INPUT-1 and the input signal on the input switching
menu screen.
No
Check between J501 and pins 16,11 and 8 of IC502.
No
Check IC502 and peripheral circuits.
No
Check between IC801 and IC502.(Q506, Q507 and Q508)
No
Check IC801 and peripheral circuits.
51
LC-19SK24U/U-W
LC-19SB24U/U-W
LC-19SB14U
LC-19D44U
2007-8-15 15:30:53