Troubleshooting - Samsung LRT19US Service Manual

5 Troubleshooting

5-1 No Power
Does proper DC14V appear
1
at BD600(+14V_IN)?
Yes
Does proper 0V appear at
R629? (MAIN_PW)
Yes
Does proper 5V appear at
2
R626?
Yes
Does proper 3.3V appear at
R630?
Yes
check IC400(scaler) or
IC402(memory).
No
Check Adaptor.
No
Check related circuit of Q604
or IC400
No
Check related circuit of IC606.
No
Check related circuit of IC607.
5 Troubleshooting
WAVEFORMS
1
2
5-1