A Dead Hovering Board Was Brought Back To Life
As the customer explained after he brought in the hovering board for repair; he was riding and suddenly it went dead and the result of that the guy was thrown off the board and almost hurt himself.
Luckily the guy was not hurt but still insisted to get this machine up and running. From experience, the cause of this incident usually one or two of the Mosfets on the main board were gone bad.
When these Mosfets get shorted, the wheel on that side of the shorted Mosfets does not turn the way it should be so it will suddenly stop ( at least one tire will stop) throwing the rider off board.
As I took the cover off to expose the main board on the left side of the photo but before I do anything on that board, it is very important to disconnect the battery on the right side of the board.
That is the main board and if you look closely you would see the Mosfets screwed down to the heat sink beneath the actual board.
And as expected, two Mosfets shorted on that board and they have to be replaced. The rotation of the tire on the left of this board was very stiff due to the fact that these two Mosfets were shorted out. The moment these shorted parts were taken off board, the rotation of that tire was smooth once again.
The part number for both Mosfets was RU6888R3 and were not very easy to find in the local store so I had to order them online and it took about two weeks to get to me.
Click on the above photo to access the datasheet
I replaced the two shorted Mosfets and turned the hover board on and it stayed on which is an indication of a working device. If there was still a short on that board, it will not come one.
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/two-blue-tooth-speakers-with-no-sound-repaired/
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Albert van Bemmelen
October 24, 2020 at 2:04 pm
Good job. Removing those thick Mosfets from their solder isn't easy. I know this from a Sedgeway clone motor board that had 13 type irfp90n20 94A 200V
N-channel Enhanced Mosfets that were soldered in very thick solder layers. And because of it almost were impossible to remove and replace. One of the board's controller chips was a Xilinx FPGA chip.
Waleed Rishmawi
October 27, 2020 at 3:43 pm
Albert: thanks man. yes, when de soldering, the board has to come off the heat sink otherwise the heat sink will take all the heat and it would be hard to come off. once I did that and added some flux, I was able to more so easily.
have a blessed day
Parasuraman S
October 24, 2020 at 4:51 pm
Well done, my dear friend! Good that luck favoured the user and you got the chance to fix it!
Waleed Rishmawi
October 27, 2020 at 3:44 pm
Parasuraman: thanks mam. yes but he was not an easy customer to deal with but end up all well. have a blessed day
Mark
October 25, 2020 at 12:33 pm
Hey Waleed,
You seem to be the new hoverboard expert!
Waleed Rishmawi
October 27, 2020 at 3:45 pm
Mark: I am not an expert yet on these devices but hopefully someday I will get there...practice maker perfect. have a blessed day.
by the way, my son's name is Mark.
babums
October 25, 2020 at 11:00 pm
This kind of repair added to me a knowledge.Thanks very much for sharing.
Waleed Rishmawi
October 27, 2020 at 3:46 pm
Babums: I a glad to hear that. have a blessed day
Yogesh Panchal
October 27, 2020 at 8:36 pm
Thanks! waleed for sharing this repair experience.
you always encourage us to get ready to explore new repair challenges.
most of the time technicians denies repair if not familiar with the equipment.