Samsung LRT19US Service Manual page 36

5 Troubleshooting
5-4 No Picture (VIDEO/S-VIDEO/SCART)
Does a signal appear at
R716(VIDEO), R720,
R721(S-VIDEO),
R722(SCART)?
Yes
Does a signal appear at
8 RA787, R788 and R793?
(VCT_ROUT,GOUT,BOUT)
Yes
Does a signal appear at
9
Pin No. 99, 98
10
(VCT_H/V Sync)?
Yes
Does a signal appear at
RA709~RA714
(ADC output)?
Yes
Does a signal appear at
Pin No.1~30 of
6
CN400(LVDS output)?
Yes
Replace LCD Panel.
5-4
No
Check related circuit A/V Ass'y
and CN700.
No
Check related circuit IC701
and Q704, Q705, Q706.(VCTI)
No
Check related circuit
IC701.(VCTI)
No
Check related
IC705.(MST9886)
No
Check IC400.(GM1501H)
WAVEFORMS
6
8
9
10