No Video (Pc Digital Signal); No Picture (Cvbs, S-Vhs, Scart Video) - Samsung LW29A13W Service Manual

5 Troubleshooting

5-3 No Video (PC Digital Signal)

Power indicator is green
Does the signal appear at
Pin 80, 81, 85, 86, 90, 91,
93 and 94 of IC833?
Yes
Does the signal
appear at RA603, RA631,
RA632 and RA633?
Yes
Replace LCD Panel.

5-4 No Picture (CVBS, S-VHS, Scart Video)

Check Pin 13, 15 (RF_CVBS1,
FR_CVBS2) of CN622?
Pin 9 (Scart1_Vin) of CN601
Pin 9 (Scart2_Vin) of CN621
Yes
Check Pin 3 (YIN), 5 (CIN)
and 7 (VCR) of CN601?
Yes
IC842 (VSP9437B)?
Yes
IC308, IC309 and replace it.
LW29A13W/LW40A13W
No
Check R2018, 2019, 2020, 2021,
2022, 2023, 2024 and 2025.
No
Check IC833 and related circuit of IC833.
No
Check Tuner, Scart1, Scart2 connector.
No
Check RCA, S-VHS connector.
No
Check related circuit of IC842
and replace IC842.
CONFIDENTIAL
5-3