Troubleshooting - Hitachi L42A404 Service Manual

Troubleshooting

1). No Picture, No Sound
First, confirm the status of Stand-by / On lamp (LED), then survey by following the flowchart as shown below.
Status of Stand-by / On lamp (LED)
Not lighting
Lighting in red
Lighting in red
Lighting in blue
(1) Stand-by / On lamp (LED)
is not lighting
The voltage of
pin No.11,No.12 of
CN701 on
Main Board is 5V?
Yes
Main Board
L42A404
Estimated cause, method of survey
Confirm the connection of AC cord is complete, and AC
switch is turned on, then forward to (1).
Power save mode of Video or PC input. It is not defect.
Turn power on by remote controller.
If it does not turn power on, forward to (2).
Forward to (2).
No
8
Power Board