Samsung UA46D7000L Series Service Manual page 38

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.
The PD board relay does not work when connecting the power cord.
-
Symptom
The units appears to be dead.
-
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.
Major
checkpoints
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.
When power on, check the sound of
Diagnostics
3.3V,1.1V appear at C1009,C1035?
Caution Make sure to disconnect the power before working on the IP board.
4-4
relay on?
Yes
Check the backlight on,
when 28p cable unconnected ?
Yes
Does proper Stand-By DC A5V
appear at the PIN 4 of CN201?
Yes
Check 'Main power input' ?
- PIN7 : B18VS
- PIN11 : B13V
- PIN1 : B5V
Yes
Does proper DC A3.3V
appear at the pin3 of IC203?
Yes
Does proper DC B3.3V appear at
the pin8 of IC202, B9V appear at
3pin of IC201?
Yes
Does proper Genoa-P core
Yes
Check power supplied to panel at
C228" and where is C228?
No
Check a connection power cable.
No
Change 28p cable.
Change Main Power Assy.
Does proper Stand-By DC A5V
No
appear at the PIN 4 of CN201?
Check 'Main power input' ?
- PIN7 : B18VS
No
- PIN11 : B13V
No
Change the IC203 or the Main Assy.
Change the IC202, IC201 or
No
the Main Assy.
Change the IC202, IC207 or
No
the Main Assy.
Check a other function(No picture part).
No
Replace a LCD Panel
- PIN1 : B5V