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