No Power - Samsung T23A750 Service Manual

4. Troubleshooting

4-2. No Power

The LED on the front panel of the monitor does not work when the power is connected and the
-
Symptom
Power button is pressed.
Check if the Power switch on the rear panel of the monitor has been turned on.
-
Major Check the SMPS fuse and output power of power adapter.
-
checkpoints
Check the power part of the Main Board and check if a similar symptom appears at another
-
output terminal.
IC2001
Diagnostics
Caution Make sure Power connection before checking the Main Board.
4-2
IC201
IC1030
(Bottom side)
IC204
CN201
Does proper 14V appear at pin
No.1 of CN201? 1
Yes
Does proper 14V appear at
BD1020? 1
Does proper 5V appear at
BD237, BD240? 2
Yes
Does proper 3.3V, 1.5V and 1.2V
appear at pin BD235 ,BD216,
BD220 and BD226? 3 4
Yes
Does proper 1.1V appear at
BD221? 5
Yes
Change main board for
Scaler(IC1001) problem
(Bottom side)
IC2010
IC206
IC202
No
Check DC Power Adapter
Check related circuit of IC1030,
No
IC2001 and IC2010.
No
Check related circuit of IC204,
IC201, IC206 and IC202.
No
Check related circuit of IC207.
IC207