Samsung LA22B480Q1 Service Manual page 98

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4. Troubleshooting
4-1-1. No Power
Symptom
Major
checkpoints
Diagnostics
Caution
4-2
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.
-
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.
-
LA22B480Q1
LAMP off, power indicator
LED red color?
Yes
Does proper DC5V appear at
1
pin7(22"), Pin27(26",32") of CN1001?
Yes
Does proper DC A3.3V
2
appear at C1004?
Yes
Does proper DC 1.8V, 1.25V appear at
R1042, C1021(22"), R1051,
3
C1031(26",32")?
Yes
A power is supplied to set?
4
Make sure to disconnect the power before working on the IP board.
Published in Heiloo, Holland
LA26B480Q1, LA32B480Q1
No
Check a connection a power cable.
No
Change a Assy PCB Power.
No
Check a IC1006
Change a main PCB ass'y
Check a IC1005, IC1005(22"),
No
IC1008(26",32")
Change a main PCB ass'y
12/9/2016