Sharp LC-19SK25U Service Manual page 52

LC-19SK25U/U-W
LC-19SB25U/U-W
LC-19SB15U
LC-19D45U
TROUBLESHOOTING TABLE (Continued)
Are signal fed from pins 1,2,3(Analog-R/G/B),and 13,14(H Sync/V Sync) of input terminal (SC401) to pins U2, N3, R, K1, J1 of
IC801 (C4US)?
Yes
Are signals from A6, A1, E1, E2, W5, W6, W7, Y6, AA6 of
IC801 normal?
Yes
Check IC9201 and peripheral circuits.
[FRONT-END SECTION]
Digital broadcasting cannot be received.
Yes
Are IF_OUT_P/N signal send from
pin (20) (19) of TU1101 respectively?
No
Check the TU1101.
No video output from PC input (INPUT4)
Yes
Yes
Are signal fed to pins Y1, A1
of IC801?
No
Check between TU1101 and
IC801.
Check peripheral circuits of IC801 and Q402,Q405,Q406.
No
Check IC801 and peripheral circuits.
Check IC9201 and peripheral circuits.
Yes
Check signal from A6, A1, E1, E2, W5,
W6, W7, Y6, AA6 of IC801 normal?
Check IC801 and peripheral circuits.
52
No
Yes
No