4-2
4. Troubleshooting
4-1-2. No Power
Symptom
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.
-
-
-
Major
checkpoints
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.
-
-
-
-
Diagnostics
Yes
Does proper Main
DC B12V, B13V, B5V appear at
TP - B12V, B13V, B5V?
Does proper DC B3.3V, B9V, DDR1.9V,
A1.2V, appear at
TP - B3.3V, B9V, 1.9V, L101?
Change the LVDS cable
32” 37” 40” : BN96-10076A
46” : BN96-10075A
No
Yes
Does proper DC B12V
appear at LVDS connector Pin #1~5
of T-con b’d?
No
Yes
Lamp(Backlight) Off,
power indicator LED on?
Yes
No
Change 30p power cable
32” : BN39-01099H
37” : BN39-01099J
40” 46” : BN39-01099K
Does proper Stand-By DC
A5V appear at TP - A5V?
No
Change the Main Assy
32” : BN94-02746A
37” : BN94-02746B
40” : BN94-02746C
46” : BN94-02746D
Yes
Does proper DC A3.3V
appear at TP - A3.3V?
Yes
Does proper DC B12V
appear at F1 of T-con b’d?
No
Yes
Change the T-con b’d
32” : BN81-02345A
37” : BN81-02368A
40” : BN81-02390A
46” : BN81-02381A
No
No
A power is supplied to set?
No
Check a other function
(No picture part)
Replace a LCD Panel
32” : BN07-00640A
37” : BN07-00643A
40” : BN07-00661A
46” : BN07-00647A
Caution
Make sure to disconnect the power before working on the IP board.
