Samsung Electronics
12-3-1 No Power (completely dead)-Initial diagnosis
1. Checklist :
1) Is input voltage normal?
2) Is AC power linked correctly?
3) Is input voltage of DC regulator IC KA7812 (IC01) normal? (11.8VDC-12.2VDC)
4) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
2. Troubleshooting procedure
Troubleshooting
12-3
12-3 Breakdown diagnosis by symptoms