Water Damaged Equipment Repaired
A dentist walked into my shop carrying an expensive dental device and wants it to get it fixed as soon as possible. It is a device that has to do with teeth planting. I have not worked on such machines before but I was willing to help the guy out.
As I took the top cover off I was able to see the inside of this machine.
There is another board that has the device controls on but it was not the main issue here because the main fault in the device is dead due to water damage. Let us find out.
The two previous photos show the big water damage that this device was exposed to. The first thing to do is to clean the board then look for faulty parts due to this water damage.
After the cleaning was done, I started looking for faulty parts and I started that by separating the power in board from the main board and connected it to a power source and to my surprise AC voltage were coming out.
Since both fuses were open so I headed to the bridge rectifier and looked for faulty parts there.
The bridge rectifier was ok but the two Mosfets next to it were both shorted.
These are the two capacitors near that area of the damage. It was also cleaned and new capacitors were added there.
I looked for a replacement for these two shorted Mosfets but I could not locate them anywhere in my area but I was able to find them online. I informed the customer and he was not happy about it due to the fact it is going to take at least 25 days for the parts to get here for this device was urgently needed in his clinic but he had no choice.
Finally, the parts were here and were soldered on board and tested (I cut the Mosfets pins later on).
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.
P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.
Note: You can check his previous repair articles in the link below: