Samsung PS42B451B2WXXU Service Manual page 42

Troubleshooting
■ ■ No Video
Symptom - A normal/cable network analog broadcast screen is blank or abnormal but OSD is OK.
- Check the antenna connection settings (Air: NTSC / ATSC, Cable: NTSC)
Major Checklist - Check the CVBS cable connection.
- Check the power input of the Main board.
Troubleshooting
Procedures
4-10
Is the antenna connection setting
properly configured?
Yes
①
Check CN1001 pin2 for +5V
Yes
Replace the Main Board
No
Configure properly
No
Replace the SMPS
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