4-2. How to Check Fault Symptom
4-2-1.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
Power cord on.
Yes
Check ‘DC A13V’ at BD233_7K_N75 ?
No
Cause : There did not supply the
power from SMPS.
Measure : Change 18P power cable
and SMPS.
Yes
Set On.
Yes
1
Check ‘SW_POWER’ less than 0.5V
appear at Q202 ?
No
Cause : Main IC(X14H) did not control
the SW_Power.
Measure : Change the Main Assy.
Yes
2
Check Power input of Main Ass’y ?
Q202 A3.3V appear at B13V (Q206) /
B5V (L201) ?
No
Cause : There did not supply the
power from SMPS.
Measure : Change 18P power cable
and SMPS or Adaptor.
Yes
Check ‘Power of LVDS (13V)’ appear at
TP-PANEL_VCC?
13V (PANEL_VCC)
No
Measure : Change the Main Assy.
Yes
Change the LVDS cable
No
Change the Panel.
Caution Make sure to disconnect the power before working on the IP board.
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