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4. Troubleshooting
4-1-1. No Power
The LEDs on the front panel do not work when connecting the power cord.
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Symptom
The IP BOARD relay does not work when connecting the power cord.
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The units appears to be dead.
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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.
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Major
checkpoints
Check the fuses of each part.
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Check the output voltage of IP BOARD.
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Replace the Main Board.
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Lamp(Backlight) Off, power indicator
Diagnostics
Does proper VCC18, VCC33 appear at
Caution
Make sure to disconnect the power before working on the IP board.
4-2
LED on?
Yes
Check the backlight on,
when 30p cable unconnected.
Yes
Does proper Stand-By DC
A5V appear at BD1003?
Yes
Does proper Main DC B13VS,
B13V, B5V appear at BD1006,
BD1004, BD1005?
Yes
Does proper DC A3.3V
appear at R1003?
Yes
Does proper
DC B3.3VD, B9V, B1.8V appear at
R1057, R1051, R1052?
Yes
Does proper DC B12V
appear at F1 of T-con b'd?
Yes
BT7, BT8 of T-con b'd?
No
Check a connetion power code.
No
Change 30p cable
Change Main Power Assy
26" : BN44-00259A
No
32" : BN44-00260A
37" : BN44-00262A
40" : BN44-00264A
No
No
Change the Main Assy
No
Change the LVDS cable
26" : BN96-07766J
No
32" : BN96-07766K
37" : BN96-07611P
40" : BN96-07611Q
No
Check a other function
(No picture part)
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