LG 42PC3RA Series, Service Manual

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3. Cannot Power on
(1) Symptom
1) Front LED is Red, but doesn’t cahge Green.
(Cannot turn on the SET)
2) Don’t operate power on using a Remocon or Local key.
(2) Check following
Yes
Is connect the IR board, Local key, and main board
with 10p and 4pin cable?
Pull off the power cord and wait until discharge entirely
(you can watch the LED on a main board through
a Back cover. If LED is off, a discharge is finished)
Then plug in the power cord again. Has it still a problem?
Is normal the Main board?
( Check voltages of P900 in main board )
Yes
No
Is normal the IR board and Local key?
Exchange the IR and Local key.
Exchange the Main board
Connect cables.
Yes
No
No