Samsung LN32A450C1D - Symptom-Based Troubleshooting

4-2
4. Troubleshooting
4-1-1. No Power
Symptom
The LEDs on the front panel do not work when connecting the power cord.
The SMPS relay does not work when connecting the power cord.
The units appears to be dead.
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Major
checkpoints
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.
Check the fuses of each part.
Check the output voltage of SMPS.
Replace the Main Board.
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Diagnostics
Caution
Make sure to disconnect the power before working on the IP board.
Does proper Main DC B13V_S, B5V,
B13V appear at #7,8 of CN1001,
C1083, BD11BL?
Does proper DC A3.3V
appear at C1081?
Check IC1002.
Change the Main Ass’y.
The location number is M0014.
No
Yes
Does proper DC B3.3V appear at
C1085?
No
Yes
Lamp(Backlight) Off, power indicator
LED on?
Yes
No
Change the power cable.
26”: BN39-00802A
32”: BN39-00802C
37”: BN39-00802S
40”: BN39-00802F
Does proper Stand-By DC
A5V appear at D1001?
No
Change the Main Power assembly.
The location number is T0764.
Yes
Yes
Check IC1003.
Change the Main Ass’y.
The location number is M0014.
Does proper 1.2V_CORE appear at
C2032?
No
Check IC3001.
Change the Main Ass’y.
The location number is M0014.