Samsung HPT5054X/XAA Service Manual page 33

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
4-6
Is the antenna connection setting
properly configured?
Yes
#
Check CN1101 pin2 for +5V
Yes
Replace the Main Board
No
Configure properly
No
Replace the SMPS
Samsung Electronics