No Power - Samsung LN32A450C1D Service Manual

4. Troubleshooting

4-1-1. No Power

The LEDs on the front panel do not work when connecting the power cord.
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The SMPS relay does not work when connecting the power cord.
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Symptom
The units appears to be dead.
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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.
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Major
Check the fuses of each part.
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checkpoints
Check the output voltage of SMPS.
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Replace the Main Board.
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Lamp(Backlight) Off, power indicator
Diagnostics
Does proper Main DC B13V_S, B5V,
Make sure to disconnect the power before working on the IP board.
Caution
4-2
LED on?
Yes
Does proper Stand-By DC
A5V appear at D1001?
Yes
B13V appear at #7,8 of CN1001,
C1083, BD11BL?
Yes
Does proper DC A3.3V
appear at C1081?
Yes
Does proper DC B3.3V appear at
C1085?
Yes
Does proper 1.2V_CORE appear at
C2032?
Change the power cable.
26": BN39-00802A
No
32": BN39-00802C
37": BN39-00802S
40": BN39-00802F
No
Change the Main Power assembly.
The location number is T0764.
Check IC1002.
No
Change the Main Ass'y.
The location number is M0014.
Check IC1003.
No
Change the Main Ass'y.
The location number is M0014.
Check IC3001.
No
Change the Main Ass'y.
The location number is M0014.