Samsung LN26C450E1H Service Manual page 21

4. Troubleshooting
4-1-2. No Power
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.
Symptom
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:
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.
Diagnostics
4-2
Lamp(Backlight) Off,
power indicator LED off?
Yes
Lamp(Backlight) Off,
power indicator LED on ?
Yes
Does proper Stand-By DC A5V
appear at TP - A5V ?
Yes
Does proper Main DC B13V, B5V
appear at TP - B13V, B5V ?
Yes
Does proper DC A3.3V
appear at TP - A3.3V ?
Yes
Does proper B3.3V, B1.8V, SPI_3.3V
appear at BD213 (B3.3V)
BD219 (DDR B1.8V) TP - SPI_3.3V ?
Yes
Change 18p power cable.
37" C539 : BN39-01267E
40" C530/C539 : BN39-01267E
No
46" C539 : BN39-01267F
26" C450/C459 : BN96-01267B
32" C450/C459: BN96-01267A
Change the Inverter(Balance B'd).
37" C539 : BN81-04438A
40" C530/C539 : BN81-04447A
No
46" C539 : BN81-04443A
26" C450/C459 : BN81-04451A
32" C450/C459 : BN81-04464A
No
No
Change the Main Assy.
C450: BN94-03377Z
C459: BN94-03377M
No
C539: BN94-03379B
No