Power-On Is Not Possible; Nothing Is Indicated On The Lcd Display - Toshiba DP120F Service Manual

4.1 Power-ON is not Possible

Step
1
Is the power cord plugged in an appropri-
ate outlet (of the correct voltage)?
2 Are the connections secure between the
LVPS (CN1) and the Mother PBA (CN1),
between the Mother PBA (CN24) and the
Main PBA (CN12)?
3
Are the rated voltages being output from
the LVPS?
4
When no problem is found in all the steps
above, the PBA's may be defective.

4.2 Nothing is Indicated on the LCD Display

Step
1 Is the cable firmly connected between the
Operation panel (CN1) and the Mother
PBA (CN19), between the Mother PBA
(CN24) and the Main PBA (CN12)?
2
If no problem is found in the step above,
the Operation panel itself or the PBA's may
be defective.
DP120F/DP125F Troubleshooting
Check points
Check points
Plug the power cord in an appropriate out-
let.
Connect each PBA firmly.
Measure the voltages between the follow-
ing pins of the LVPS (CN1). When the rated
voltage is not measured, replace the LVPS.
Measuring points
Pin 1 - Pin 6
Pin 7 - Pin 10
Pin 10 - Pin 9
Pin 11 - Pin 14
Pin 15 - Pin 16
Replace in the order of: Main PBA, Mother
PBA.
Insert the cable or connector to the con-
nectors firmly.
Replace in the order of: Operation panel,
Main PBA, Mother PBA.
11-58
Solutions
Rated voltage
DC +24V +10%
DC +12V +5%
DC -12V +5%
DC +5V +5% / -4%
DC +5VPS +5% / -4%
Solutions
March 2000 © TOSHIBA TEC