4-1-1. No Power
Symptom
The PD board relay does not work when connecting the power cord. -
The units appears to be dead.
-
Major
checkpoints
The PD relay does not work when connecting the power cord if the cables are improperly connected or the
Main Board or PD is not functioning. In this case, check the following:
Check the internal cable connection status inside the unit. -
Check the fuses of each part.
-
Check the output voltage of PD.
-
Replace the Main Board.
-
Diagnostics
Does proper Main DC B18VS, B5V,
B13V appear at the PIN 3, PIN 5,
PIN13 of CN201?
Does proper DC A3.3V appear at
the pin3 of IC201?
Change the IC201 or the Main Assy.
No
Yes
Does proper DC B3.3V appear at
the pin8 of IC206, B9V appear at
3pin of IC203?
No
Yes
When power on, check the sound of
relay on?
Yes
No
check a connection power cable.
P/N : BN96-12845D
Does proper Stand-By DC A5V appear
at the PIN 4 of CN201?
No
Change the Main Power assembly
46" : BN44-00375A
55" : BN44-00376A
Yes
No
Yes
Change the IC206, IC203 or
the Main Assy.
Does proper Valencia core
3.3V,1.1V appear at C1001,C1030?
No
Change the IC210, IC205 or
the Main Assy.
A power is supplied to panel
appear at C2119?
Check a other function(No picture part).
Replace a LCD Panel.
46": BN07-00863A
55": BN07-00864A
No
Yes
Caution Make sure to disconnect the power before working on the PD board.
Notice Refer to the next page for detailed locations.
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