Samsung LE20S81BX Service Manual page 79

4 Troubleshooting
4-2 Checkpoints by Error Mode
4-2-1 No Power
Does proper DC 14V/5V
1
appear at Pin 3. Pin 9 of
CN100?
Yes
Does proper DC A5V
2
appear at FT144?
Yes
Does proper B3.3V
3
appear at Pin 2 of IC111?
Yes
Does proper DC B1.8V
4
appear at Pin 4 of Q802,
Q803?
Yes
Does proper DC B8V
5
appear at IC109?
Yes
Does proper DC 5V_P
6
appear
at Pin 2 of IC108?
Yes
Does proper DC 9V_S
7
appear at IC110?
Yes
Does proper DC B5V
8
appear at IC120?
Yes
Check IC800 and IC400.
4-2
No
Check connector Pin3, Pin9 in
I/P Board.
No
Check IC101 and IC105.
No
Check IC102.
No
Check Q802, Q803.
No
Check IC109.
No
Check IC108.
No
Check IC110.
No
Check IC120.