No Power - Samsung 320TSn-2 Service Manual

4. Troubleshooting

4-2. No Power

When turning on the Power button after connecting the power, the LED at the front of the
-
Symptom
monitor does not operate.
Check the IP board power fuse and the IP board output power.
-
Check the connections for the IP board and the Main board inside the monitor.
-
Major
Check the LED of Power & IR function board and connections between the function assy and
-
checkpoints
main board.
Check the Main board power part and check also whether there is any abnormal output at other
-
output terminals.
Does 5.3 V appear at Pin #4 of CN601
Diagnostics
Does DC 12V appear at BD605?
Does DC 12V appear at C602? ①
Does 1.26V appear at C628? ③
Does DC 2.5V appear at C640?
Caution Make sure to disconnect the power before working on the IP board.
4-2
BD605
CN601
C602
Yes
Yes
Yes
Does 3.3V appear at C636? ②
Yes
Yes
Yes
The Scaler is abnormal.
Replace the main board.
C636
C640
C628
No
Check the SMPS Board.
No
Check the peripheral circuit of
No
No
No
No
Check the LCD Panel.
CN601.
Replace IC602.
Replace IC604.
Replace IC603.