Samsung PS-50C7HR Service Manual page 39

Troubleshooting
6-2-5 No Video
Symptom - A normal/cable network analog broadcast screen is blank or abnormal.
- Check the antenna connection settings (Antenna 1 - Normal/Cable/DTV, Antenna 2 - Only for DTV)
Major Checklist - Check the tuner output signal (CVBS).
- Check the power input of the Main board.
Troubleshooting
Procedures
6-6
Is the antenna connection setting
properly configured?
Check CN101 pin2 for +33V
Replace the Main Board
Configure properly
Replace the Main SMPS
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