Samsung LN32A550P3R Service Manual page 28

4. Troubleshooting
4-1-1. No Power
The LEDs on the front panel do not work when connecting the power cord.
-
The SMPS / IP Board relay does not work when connecting the power cord.
-
Symptom
The units appears to be dead.
-
The SMPS / IP Board 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:
Major
Check the internal cable connection status inside the unit.
-
checkpoints
Check the fuses of each part.
-
Check the output voltage of SMPS.
-
Replace the Main Board.
-
Lamp(Backlight) Off, power indicator
Diagnostics
Does proper Inverter DC 12V appear at
Does proper DC A3.3V appear at C1006?
Make sure to disconnect the power before working on the SMPS / IP Board board.
Caution
4-2
LED on?
Yes
Does proper Stand-By DC
A5V appear at C1002?
Yes
Does proper Main DC B12VS, B5V, B12V
appear at C2060, C1011, C1008_DE?
Yes
CN1001 in SMPS?
Yes
Yes
Does proper DC B1.26VD, MT_
DDRV18, B1.8V, B3.3V, B1.5VA
appear at C1037, C1045, C1042,
C1024, C1041?
Yes
A power is supplied to panel
appear at C1025_DE?
Check a connection power cable.
No
(Code Number refer to each
model's BOM)
No
Change the Main Power assembly
(Code Number refer to each model's
No
No
Check IC1002 Change the Main Ass'y
No
(Code Number refer to each model's
Check IC1019, IC1008, IC1009, IC1005,
No
IC1007 Change the Main Ass'y
(Code Number refer to each model's
Check a other function (No picture part)
No
Replace a LCD Panel
(Code Number refer to each model's
BOM)
BOM)
BOM)
BOM)