This e-wis LED Monitor came in for repair with the complaint of no power. The power LED was not lighted even the main ac was connected.
Once the cover was removed I could see the two circuit boards i.e; power and mainboard-see the photo below:
The main fuse was found to be good so I had to perform the on board voltage test to see if the power supply is producing any output voltages or not. The two output voltages that I had tested were 5 volt and 12 volt. There were no output voltage and this confirmed that the power supply indeed have problem.
I removed the power supply and checked on the two output diodes first. Surprisingly the first component (diode) that I had tested was shorted when checked with my digital multimeter.
This was the diode that was found to be shorted.
I checked further downstream to see if there is any other components found to be faulty but all checked to be good. Even all the secondary filter caps were checked to be good too. I concluded that there was only one output diode shorted and after the replacement of the diode look at the result below:
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