No Power - Samsung LA19C350D1 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.
-
checkpoints
Check the output voltage of SMPS.
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Replace the Main Board.
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1
2
Diagnostics
3
4
Make sure to disconnect the power before working on the IP board.
Caution
4-2
LAMP off, power indicator
LED red color?
Yes
Does proper DC5V appear at
pin 6 of CN1001?
Yes
Does proper DC A3.3V
appear at R1111?
Yes
Does proper DC A2.5V, A1.2V appear at
R1110, C1116?
Yes
A power is supplied to set?
19"/22"_C350
No
No
No
No
26"/32"_C350
Check a connection a power cable.
Change a Assy PCB Power.
Check a IC1106
Change a main PCB ass'y
Check a IC1105, IC1107
Change a main PCB ass'y