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4. Troubleshooting
4-1-2. No Power
The LEDs on the front panel do not work when connecting the power cord.
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Symptom
The SMPS relay does not work when connecting the power cord.
-
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 SMPS 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.
-
Check the output voltage of SMPS.
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Replace the Main Board.
-
Diagnostics
Caution
Make sure to disconnect the power before working on the IP board.
4-2
Lamp(Backlight) Off,
power indicator LED on?
Yes
Does proper Stand-By DC A5V appear at
TP-A5V1?
Yes
Does proper Main DC B13C, B5V appear at
TP-B13VS1, B5V1?
Yes
Does proper DC-A3.3V appear at BD215?
Yes
Does proper B3.3V, B1.8V, A3.3V_
PW appear at BD216(B3.3V_PW),
BD212(B1.8V_PW), BD215(A3.3V_PW)?
Yes
Does proper DC B13V
appear at LVDS connector
Pin #1~5 of T-con b'd?
Yes
A power is supplied to set?
No
Change 18p power cable.
No
No
Change the Main Assy.
No
No
No
Change the LVDS cable.
No
Check a other function.
(No picture part)
Replace a LCD Panel.
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