LB-1085 - Sharp Monitor Service Manual (repair manual). Page 51

TROUBLESHOOTING

7 – 4

4 THE POWER IS NOT SUPPLIED.

Is each output voltage 

supplied from each 

power PWB?

No

Abnormality

Immediately 
flashing

Flashes several seconds 
later, or turns off

No abnormality

No abnormality

No abnormality

Abnormality

Abnormality

Check the inverter power. 
Check for blown fuse.

Does the LED 

flashes immediately after 

AC_ON or does it light in blue and 

then flash several 

seconds after?

Is there no abnormality in the power PWB 
and its related sections?

Is the fuse blown off?
Is there no abnormality in the power PWB?
Is there no abnormality in the switch cable?
Is there no abnormality in the filter block?
Is there no abnormality in the AC power cord?

Is there no abnormality in the main/power interface PWB and 
the related sections?

Is there any abnormality in the connection cable and the connector?

Is there no abnormality in the main PWB?

Is the power SW ON?
Is there any abnormality in the power SW?

Is there any abnormality in the switch/LED PWB and the related 
sections?

Replace 
the abnormal parts.

Replace 
the abnormal parts.

No

Yes

Is the AC power plug inserted properly?

Insert the AC 

plug properly. 

Is there any abnormality in the connection cable and the connector?

Is there any abnormality in the switch/LED PWB?