Samsung UN19C4000PD Service Manual page 30

4. Troubleshooting
4-1-2. No Power
The LEDs on the front panel do not work when connecting the power cord.
-
Symptom 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.
-
Major
Check the fuses of each part.
checkpoints
-
Check the output voltage of SMPS.
-
Replace the Main Board.
-
Diagnostics
Make sure to disconnect the power before working on the IP board.
Caution
4-2
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
Does proper DC B13V
appear at LVDS connector
Pin #1~5 of T-con b'd?
Yes
A power is supplied to set?
Change 18p power cable.
No
26"C4000 : BN39-01267A
22"C4000 : BN39-01267L
19"C5000 : TBD
No
No
Change the Main Assy.
26" : BN94-03399B
No
22"/19" : BN94-03399C
No
Change the LVDS cable.
No
26"C4000 : BN96-12469L
22"C4000 : BN96-12447N
19"C5000 : TBD
Check a other function.
No
(No picture part)
Replace a LCD Panel.
26"C4000 : BN07-00847A
22"C4000 : BN07-00865A
19"C5000 : TBD