Samsung LN32B550K1F Service Manual page 170

4. Troubleshooting
4-1-2. No Power
The LEDs on the front panel do not work when connecting the power cord.
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Symptom The SMPS relay does not work when connecting the power cord.
-
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
checkpoints Check the fuses of each part.
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Check the output voltage of SMPS.
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Replace the Main Board.
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Diagnostics
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 BD102?
Yes
Does proper Main
DC B12V, B13V, B5V appear at
BD104, BD108, BD106?
Yes
Does proper DC A3.3V
appear at R102?
Yes
Does proper DC B3.3V, B9V, A1.2V,
DDR1.9V appear at
R171, R173, C122, R527?
Yes
Does proper DC B12V
appear at LVDS connector Pin #1~5
of T-con b'd?
Yes
Does proper DC B12V
appear at F1 of T-con b'd?
Yes
A power is supplied to set?
Change 30p power cable
No
32" : BN39-01099H
37" : BN39-01099J
46"/46"/52" : BN39-01099K
No
Change the Main Assy
550 32" : BN94-02518A
550 37" : BN94-02518B
No
550 40" : BN94-02518A
550 46" : BN94-02518D
550 52" : BN94-02518E
No
540 40" : BN94-02510A
540 46" : BN94-02510B
540 52" : BN94-02510C
No
Change the LVDS cable
32"/37" : BN96-10076A
No
40"/46" : BN96-10075A
52" : BN96-10074A
Change the T-con b'd
32" : BN81-02345A
No
37" : BN81-02368A
40" : BN81-02390A
46" : BN81-02381A
52" : BN81-02342A
Check a other function (No picture part)
Replace a LCD Panel
No
32" : BN07-00640A
37" : BN07-00643A
40" : BN07-00661A
46" : BN07-00647A
52" : BN07-00678A