4-1-2. 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-A5V1?
Does proper Main DC B13C, B5V appear at
TP-B13VS1, B5V1?
Does proper DC-A3.3V appear at BD215?
Does proper B3.3V, B1.8V, A3.3V_
PW appear at BD216(B3.3V_PW),
BD212(B1.8V_PW), BD215(A3.3V_PW)?
Does proper DC B13V
appear at LVDS connector
Pin #1~5 of T-con b'd?
A power is supplied to set?
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Change the Main Assy.
Change 18p power cable.
Change the LVDS cable.
Check a other function.
(No picture part)
Replace a LCD Panel.
No
No
No
Lamp(Backlight) Off,
power indicator LED on?
Caution Make sure to disconnect the power before working on the IP board.
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