An Air Condition Power Board Repair
An AC technician brought his board for repair and explained that it was a dead one. As I powered up the device, I did not see any sign of life on that board.
As you can see, it is a very clean board and when checking with my naked eye for any fault, none was found.
The main fuse was intact.
That is the other side of this board and I could not see anything wrong there either.
As I checked for voltage reading at the main capacitor, there was no reading there. From a logical point of view the best way to trace the problem is go backwards from that point on and find my voltage reading that is missing.
If you check on the board you will see that the main voltages come from that transformer but when I checked the output of that transformer, there was no reading either. When I checked the power on the input of that transformer there was 220 present.
Yes, you got that right, the transformer is faulty. It was getting the 220 volts from the main line but there was no output.
That is the specs of this transformer. I should be getting 14 VAC and 11.5 VAC on the output. If you look to the main input of this transformer, you will see a fuse and I bet that fuse was open causing this board not to function.
With a fine tip blade and sharp eyes, I was able to open the transformer from the input side looking for that fuse and I found it. As expected, the fuse was open and needed a replacement. It is a very delicate wires that I am dealing with here so be careful when doing such a repair. I could get another transformer and just install it but where is the fun in that?
I managed to replace that open fuse with a good one and plugged it back on board and powered up the device.
As you can see, the green light came on indication a successful repair and to that I can call it…
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below: