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4. Troubleshooting
4-1-1. No Power
The PD board relay does not work when connecting the power cord.
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Symptom
The units appears to be dead.
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The PD relay does not work when connecting the power cord if the cables are improperly connected or the
Main Board or PD is not functioning. In this case, check the following:
Check the internal cable connection status inside the unit.
-
Major
Check the fuses of each part.
checkpoints
-
Check the output voltage of PD.
-
Replace the Main Board.
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Caution
Make sure to disconnect the power before working on the IP board.
COMP SOUND
COMP SOUND
When power on, check the sound of
A5V appear at the PIN 27 of CN1001?
Diagnostics
A power is supplied to panel appear
4-8
COMPONENT
COMPONENT
AUDIO
AUDIO
relay on?
Yes
Does proper Stand-By DC
Yes
Does proper Main DC B12VS,
B5V,B13V appear at the the PIN23,
PIN15, PIN9 of CN1001?
Yes
Does proper DC A3.3V appear at the
Pin5 of IC1002?
Yes
Does proper DC B3.3V appear at
1pin of IC1005 and IC1008, B9V
appear at 3pin of IC1003?
Yes
Does proper chelsea core 1.2V, 1.8V
appear at C1032, C1033?
Yes
at C7136?
HDMI2
HDMI2
HMDI1/DVI
HMDI1/DVI
DVI/PC
DVI/PC
SOUND IN
SOUND IN
CN3011
CN3011
No
No
No
No
No
No
No
IC6001
IC6001
Check a connection power cable.
P/N: BN96-09872A
Change the Main Power assembly
40" / 46" : BN44-00269A
55" : BN44-00271A
Change the IC1002 or the Main Assy
Change the IC1005, IC1008, IC1003
or the Main Assy
BN94-02706A
Change the IC1007, IC1008
or the Main Assy
Check a other function (No picture part)
Replace a LCD Panel
40" : BN07-00700B
46" : BN07-00701B
55" : BN07-00702B
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