No Power - Samsung P2770HD 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.
-
Check the SMPS fuse and the IP-Board output power.
-
Major
Check the connection between the IP-Board and the Main Board inside the monitor.
-
checkpoints
Check the power part of the Main Board and check if a similar symptom appears at another
-
output terminal.
Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
4-2
CN1001
Does proper 14.5V appear at pin
No. 2 of CN1001? ①
Does proper 5V appear at pin No.
6 and 7 of CN1001? ②
Yes
Does proper 14.5V appear at
BD1013? ①
Does proper 5V appear at
BD1021? ②
Yes
Does proper 3.3V appear at pin
No.1 of IC1024? ②
Yes
Does proper 14.5V appear at
IC1023? ③
Yes
Change main board for
Scaler(IC4010) problem
IC1023
IC4010
Main Board Front
No
No
Check related circuit of CN1001.
No
Check related circuit of IC1024.
No
Check related circuit of IC1022.
Check IP Board