4-5
4. Troubleshooting
4-1-1. No Power
Symptom
The LEDs on the front panel do not work when connecting the power cord.
The IP BOARD relay does not work when connecting the power cord.
The units appears to be dead.
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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 IP BOARD 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 IP BOARD.
Replace the Main Board.
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Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
Yes
Does proper Stand-By DC
A5V appear at BD1003?
Does proper DC A3.3V
appear at R1003?
Change the Main Assy
BN94-02709A
No
Does proper DC B3.3VD, B9V,
B1.25VD, B1.8V appear
at R1030, R1101, BD1010, R1105?
No
Lamp(Backlight) Off, power indicator
LED on?
Yes
No
Check a connetion power code.
Check the backlight on,
when 30p cable unconnected.
No
Change 30p cable
32” : BN39-01099H
40” 46” 52” : BN39-01099K or
Change Main Power Assy
32” : BN44-00261B
40” : BN44-00264C
46” : BN44-00265A
52” : BN44-00267B
Yes
Does proper Main DC B13VS,
B13V, B5V appear at BD1006,
BD1004, BD1005?
Yes
Does proper DC B12V
appear at F1 of T-con b’d?
No
Change the LVDS cable
32” : BN96-10077A
40” : BN96-10075A
46” : BN96-10075A
52” : BN96-10074A
Change the T-con b’d
Does proper DC B1.25V, B3.3VD
appear at BD8005, BD8004 of
T-con b’d?
No
No
No
Yes
Yes
Yes
Yes
Does proper VCC18, VCC33 appear at
BT7, BT8 of T-con b’d?
No
Check a other function
(No picture part)
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