No Power - Samsung LN26C350D1D Service Manual

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4. Troubleshooting

4-1-1. No Power

The LEDs on the front panel do not work when connecting the power cord.
-
Symptom
The SMPS relay does not work when connecting the power cord.
-
The units appears to be dead.
-
The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are
improperly connected or the Main Board or SMPS 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 SMPS.
-
Replace the Main Board.
-
Diagnostics
Does proper DC B3.3V, B9V, DDR1.9V,
Make sure to disconnect the power before working on the IP board.
Caution
4-2
Lamp(Backlight) Off,
power indicator LED on ?
Yes
Does proper Stand-By DC
A5V appear at TP - A5V?
Yes
Does proper Main
DC B12V, B13V, B5V appear at
TP - B12V, B13V, B5V?
Yes
Does proper DC A3.3V
appear at TP - A3.3V?
Yes
A1.2V, appear at
TP - B3.3V, B9V, 1.9V, L101?
Yes
Change the LVDS Cable
26" : BN96-12469B
32" : BN96-12469C
Lamp(Backlight) on, no video ?
Change power cable.
No
LC350_26", 32" : BN39-01278A
No
Change Main Power Assy.
LC350_26": BN44-00368A
LC350_32" : BN41-00369A
No
No
Change the Main Assy.
LC350_26",32" : BN94-02649A
No
No
Check "No video."

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