Samsung LA20S51BP 09 Troubleshooting
4 Troubleshooting
4-1
4 Troubleshooting
4-1 First Checklist for Troubleshooting
1. Check the various cable connections first.
- Check to see if there is a burnt or damaged cable.
- Check to see if there is a disconnected cable connection or a connection is too loose.
- Check to see if the cables are connected according to the connection diagram.
2. Check the power input to the Video Board.
3. Check the voltage in and out between the SMPS Video Board, between the SMPS X, Y
Drive Board, and between the Logic Boards.
4 Troubleshooting
4-2
4-2 Checkpoints by Error Mode
4-2-1 No Power
Does proper DC 14V/5V
appear at Pin 3. Pin 9 of
CN100?
Check connector Pin3, Pin9 in
I/P Board.
Yes
No
No
No
No
No
Does proper DC A5V
appear at FT144?
Check IC101 and IC105.
Yes
Does proper B3.3V
appear at Pin 2 of IC111?
Check IC102.
Yes
Does proper DC B1.8V
appear at Pin 4 of Q802,
Q803?
Check Q802, Q803.
Yes
Does proper DC B8V
appear at IC109?
Check IC109.
1
2
3
4
5
No
No
No
Check IC800 and IC400.
Yes
Does proper DC 5V_P
appear
at Pin 2 of IC108?
Check IC108.
Yes
Does proper DC 9V_S
appear at IC110?
Check IC110.
Yes
Yes
Does proper DC B5V
appear at IC120?
Check IC120.
6
7
8
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