Samsung UN46C7000WF Service Manual page 76

4-1-1. No Power
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Symptom
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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:
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Major
checkpoints
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When power on, check the sound of
Does proper Stand-By DC A5V appear
Diagnostics
Caution Make sure to disconnect the power before working on the PD board.
Notice Refer to the next page for detailed locations.
The PD board relay does not work when connecting the power cord.
The units appears to be dead.
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.
relay on?
Yes
at the PIN 4 of CN201?
Yes
Does proper Main DC B18VS, B5V,
B13V appear at the PIN 3, PIN 5,
PIN13 of CN201?
Yes
Does proper DC A3.3V appear at
the pin3 of IC201?
Yes
Does proper DC B3.3V appear at
the pin8 of IC206, B9V appear at
3pin of IC203?
Yes
Does proper Valencia core
3.3V,1.1V appear at C1001,C1030?
Yes
A power is supplied to panel
appear at C2119?
No
check a connection power cable.
P/N : BN96-12845D
Change the Main Power assembly
46" : BN44-00375A
No
55" : BN44-00376A
No
No
Change the IC201 or the Main Assy.
Change the IC206, IC203 or
No
the Main Assy.
Change the IC210, IC205 or
No
the Main Assy.
Check a other function(No picture part).
Replace a LCD Panel.
No
46": BN07-00863A
55": BN07-00864A
4. Troubleshooting
4-11