No Power - Samsung LE32B53 SERIES Service Manual

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
checkpoints Check the fuses of each part.
-
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_PW appear at TP2004?
Yes
Does proper Main B12VS_PW,
B13V_PW, B5V_PW appear at
TP2007~8, TP2020~2, TP2013~6?
Yes
Does proper A3.3V_PW
appear at R2028?
Yes
Does proper B3.3V_PW, B1.9V_PW,
B1.25V_PW appear at
C2607, C2590, C2105?
Yes
Does proper PANEL_VCC_PW
appear at LVDS connector Pin #1~5
of T-con b'd?
Yes
Does proper DC B12V
appear at F1 of T-con b'd?
Yes
A power is supplied to set?
No
Change the 30P power cable
No
No
Change the Main Assy
No
No
No
Change the LVDS cable
No
Change the T-con b'd
Check a other function
No
(No picture part)
Replace a LCD Panel
or IP board