Samsung UA46D7000L Series, Service Manual

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4-4
4. Troubleshooting
4-1-2. How to check fault symptom
No Power
„
Genoa-P
N
Refer to the next page to check the location such a CN201 or IC201 SVC Manual mentioned.
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.
Caution Make sure to disconnect the power before working on the PD board.
Diagnostics
When power on, check the sound of
relay on?
Yes
No
Check a connection power cable.
Change 28p cable.
Change Main Power Assy.
Check a other function(No picture part).
Replace a LCD Panel
No
No
No
No
No
No
No
Check the backlight on,
when 28p cable unconnected ?
Yes
Check power supplied to panel at
C228" and where is C228?
Does proper Stand-By DC A5V
appear at the PIN 4 of CN201?
Yes
Does proper Stand-By DC A5V
appear at the PIN 4 of CN201?
Check ‘Main power input’ ?
- PIN7 : B18VS
- PIN11 : B13V
- PIN1 : B5V
Does proper DC B3.3V appear at
the pin8 of IC202, B9V appear at
3pin of IC201?
Does proper Genoa-P core
3.3V,1.1V appear at C1009,C1035?
Does proper DC A3.3V
appear at the pin3 of IC203?
Check ‘Main power input’ ?
- PIN7 : B18VS
- PIN11 : B13V
- PIN1 : B5V
Change the IC202, IC201 or
the Main Assy.
Change the IC202, IC207 or
the Main Assy.
Change the IC203 or the Main Assy.
Yes
Yes
Yes
Yes
Caution Make sure to disconnect the power before working on the IP board.