A Power Board For A Medical Device Repaired
A medical company that my brother works in brought me a power board for repair. It is a board that supplies power to a medical device. The customer did not mention anything about the device but simply wanted to repair this board as soon as possible.
The board is very tiny and by the look of it,
I could see a lot of corrosion in some part of the board.
Here is a closer look of the board and I could see a broke trace on that board.
The broken trace was coming out of this transistor and one of the pins of this transistor was corroded as well and needed something attention.
The backup battery is also corroded and needed some attention as well. So I was hoping the corrosion is the only problem we have on this board.
Traced fixed and the transistor next to it, cleaned tested and put back on board.
The battery cleaned, charged and tested and found to be ok so I soldered it back on board.
I also went over the soldering joints on that board and re touched all of them which took some time but it was finally done.
As shown in the photo, this transistor pins had some cold soldering joints and it was re soldered once again and it was nice and shinny.
Since the customer did not bring the actual device for testing, I called him and was not able to bring the machine because it is in a different city about two hours away and the device is too heavy to move. So he had to come and get the board and take it to that location for testing.
After one week, he called and said it was working just fine when tested on a new device but when attached to the old device, the motor was not running assuming there is a problem with that motor.
He was happy that the board was working fine and he could keep it as a backup power supply whenever it is needed.
Mission Accomplished.
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:
https://jestineyong.com/a-treadmill-powers-on-but-the-motor-does-not-run-repaired/
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Anwar Y Shiekh
October 30, 2020 at 8:31 am
What causes such corrosion? the board not being properly cleaned?
Waleed Rishmawi
October 31, 2020 at 4:04 pm
Anwar: it was in the storage room for a while. that can cause a lot of damage if the device not covered or protected.
Parasuraman S
October 30, 2020 at 8:59 am
While you fixed a power supply board, you could get an added satisfaction of putting back perhaps an essential medical equipment to work, especially in this pandemic period. You could also help fix another one because of detecting the fault! Great and creditable achievement, indeed!
Waleed Rishmawi
October 31, 2020 at 4:05 pm
Parasuraman: very true indeed. have a blessed day
Lynn Blakely
October 30, 2020 at 9:26 am
Sir Waleed: This shows how being attentive and taking the time to be through,can get the job done. Of course you checked the transistor that had a foil that was burned to one leg.
Waleed Rishmawi
October 31, 2020 at 4:07 pm
Lynn: yes paying a lot of attention to details including of course checking the transistor and anything around that area..have a blessed day
Jai Etwaroo
October 30, 2020 at 10:39 am
Good job Waleed.
Waleed Rishmawi
October 31, 2020 at 4:07 pm
Jai: thanks man. have a blessed day
Albert van Bemmelen
October 30, 2020 at 2:05 pm
Unfortunate that repairs like these important ones never come with any supporting schematics. Maybe the medical company had those but didn't provide any that could have given some info on the board functions and why it needed a backup battery. I guess its a good thing that no backup SRAM or other chip lost important configuration data after the battery got seperated from the board.
Waleed Rishmawi
October 31, 2020 at 4:10 pm
Albert: yes, if schematics are found for such equipment, that would be great help in maintaining and repairing any device. the company did not have any schematics for this device because it cost too much money to get them according to the manager and they devices do not break that often so, they are not bothered of getting any of it. have a blessed day
wim kuijper
November 2, 2020 at 7:41 pm
ik denk dat die accu van waarschijnlijk 3.6 v weer gaat lekken beter een nieuwe plaatsen groeten wim
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I think that battery of probably 3.6 v will leak again, better place a new one greetings wim
Yogesh Panchal
October 30, 2020 at 4:09 pm
Waleed,
Trace look like damaged by Over current.....
Waleed Rishmawi
October 31, 2020 at 4:11 pm
Yogesh: I think so too. have a blessed day
babums
October 30, 2020 at 11:03 pm
It is very good repair work.What is the cause for damage of the track.
Waleed Rishmawi
October 31, 2020 at 4:12 pm
Babums: the damage of the track could be due to over current combined with humidity on board. have a blessed day
LLOYD
October 31, 2020 at 12:03 am
THANKS FOR ANOTHER GOOD ARTICLE
Waleed Rishmawi
October 31, 2020 at 4:12 pm
LLOYD: you are most welcome. have a blessed day
Pe Than Htun
October 31, 2020 at 5:41 pm
Thanks for the post. I am a hobbyist and DIY at home. It seems not to be a SMPS because I don't see a transformer. With so many ICs what is the type of this.
I am also glad that you have achieved safe and 100% good repair. In my country most medical equipment manufacturer do not accept repair and they want to replace new board. Any way, for out of warranty and very old equipment this is very encouraging.
Waleed Rishmawi
November 2, 2020 at 4:02 pm
Pe: I do not know where the transformer is, only the board was brought to me for repair but I am sure it was left in the customer's place because he tested it later on. yes sad to say they only replace the board but in my shop we give the board a good repair and safe it from the trash can at least that is what we try to do. have a good blessed day