4-1-1. 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
Does proper Stand-By DC
A5V appear at TP - A5V?
Does proper DC A3.3V
appear at TP - A3.3V?
Change the Main Assy.
LC350_26",32" : BN94-02649A
No
Yes
Does proper DC B3.3V, B9V, DDR1.9V,
A1.2V, appear at
TP - B3.3V, B9V, 1.9V, L101?
No
Yes
Lamp(Backlight) Off,
power indicator LED on ?
Yes
No
Change power cable.
LC350_26", 32" : BN39-01278A
No
Change Main Power Assy.
LC350_26": BN44-00368A
LC350_32" : BN41-00369A
Does proper Main
DC B12V, B13V, B5V appear at
TP - B12V, B13V, B5V?
Yes
Change the LVDS Cable
26" : BN96-12469B
32" : BN96-12469C
Lamp(Backlight) on, no video ?
No
Check "No video."
No
Yes
Caution
Make sure to disconnect the power before working on the IP board.
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