Samsung LN32B550K1M Service Manual page 29

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.
-
Major
Check the fuses of each part.
-
checkpoints
Check the output voltage of SMPS.
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Replace the Main Board.
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1
Diagnostics
1
1
Make sure to disconnect the power before working on the IP board.
Caution
4-2
1
LAMP off, power indicator
LED red color?
Yes
Does proper DC 13V appear at
pin9, 10, 11 of CN1001?
Yes
Does proper DC A3.3V
appear at C1019, R1009?
Yes
Does proper DC 5V, 3.3V, 1.25V,
CORE_1.24V, CLS_1.8V appear
at C1008, C1016, C1073, R1037,
C1034, C1033?
Yes
Does proper B3.3VD appear at
BD2711 of T-con b'd?
Yes
A power is supplied to set?
No
Check a connection a power cable.
No
Change a Assy PCB Power.
No
Check a IC1002
Change a main PCB ass'y
Check a IC1004, IC1005, IC1010,
No
IC1009, IC1007, IC1006
Change a main PCB ass'y
No
Change the T-con b'd
Check a other function.
No
(No picture part)
Replace a lcd panel.