A Dead Power Supply Repaired And Maintained
My cousin brought this power supply for repair. He said that this power supply is used to power up an electrical stove and suddenly they heard a popping sound and the stove stopped working.
I can see where the popping sound came from and as seen in the photo the board took a lot of damage and hopefully it is repairable.
I took the board off the heat sink to see if there is any damage on the other side of the board and I found this.
I think I can handle this so I started taking the shorted parts off and cleaning the board to see what can be done here.
I took all the shorted/burnt parts off and started to fix the board on the less damaged side.
I connected the broken tracks and headed to the other side of the board.
I replaced the big exploded cap with the exact specs, 47uf/400 volts, the four diodes as well although not all the diodes were shorted and the main fuse.
I checked the board for more damaged parts and found none.
The board looked nice and clean but most important will it work? This is a moment of truth to see the outcome of this repair.
Yes, the board worked like a charm. Of course I connected it first through a current limiter and the light bulb came on for a few seconds and it went dim which is an indication that all is well and ready to be used in a normal power situation.
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 article on A Simple Fix To A Dead Electronic Scale Brought It Back to Life