How To Repair A Dead Hoverboard-Model UERA-ESU010
I have repaired a hovering board before that had to do with charging issues. This charging repair is completely different and deeper repair. Take a look
The customer explained when he powers up the charger; the charger red Let light comes on but when plugs it into the hovering board, the Led charging light on charger goes off.
First I thought it was a charger fault not able to handle heavy load. When testing on another hovering board, the charger was fine.
As you can see I took it apart and started to investigate the problem on a deeper level.
I got to the main logic board and as you can see, there are a lot of wires connected together. Some wires were color coded but the ones which were not coded; I added my own color code to it. I used magic permanent markers for that job.
Once the wires were loose and few screws were off, I was able to reach the Mosfets on that board. As you can see from the photo, there are a lot of them.
It did not take me that long to find out that two of the Mosfets were shorted out.
As you can see, the part number is HN75N09AP. I have looked for such Mosfets but no luck. I have talked to many repair technicians about this part but still no luck until I spoke to a guy who is very knowledgeable with part replacements.
The moment I mentioned this part to him, right away, I informed me with this replacement. It was a Mosfet that that handle up to 80 amps up to 55 volts. The part number is IRF3205. It seems like he has done this kind for repair before and it worked nicely with him.
I had one already in my shop that is why you can see only one. I bought the other part from an electronic part shop nearby later on. The moment I installed the replacement, the battery icon came on.
I put everything back together and I charged the machine. It seems like it was working fine. A saw a kid near buy who already has one and know how to use it. I asked him to try it out. He did but there was still a problem with it. The left LED light strip was not working.
I clipped the plastic part off exposing the LED lights. I tried it with my multimeter set to diode setting and all were tested fine. The LED Lights come on different colors. They were Red, blue and green.
These LED lights get their power from this board. I was getting power but for some reason, the lights were not coming on. I checked for continuity between the four points to the light points, all of them checked ok except the black line. So I decided to re soldering me all over again.
This is the finish work for these LED light board.
The moment I get these wires fixed and installed back on the board, here is the outcome.
Conclusion: hovering board repaired, LED light repaired, happy customer and a big smile on my face. 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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Parasuraman
November 14, 2017 at 9:47 pm
Excellent!
Robert Calk
November 14, 2017 at 10:09 pm
Good job, Waleed. I have never been inside one of those yet.
Albert van Bemmelen
November 14, 2017 at 11:39 pm
Thanks for the valuable Mosfet replacement tip Waleed!
It is always good to know because a Datasheet of the HN7509 is hard to find.
Albert
November 17, 2017 at 9:46 pm
PS: other exceptional N-channel mosfets could be the SUM110N10-09 with 110A at 100V, or the STY139N65M5 (max247 package) with 130A at 650V, or the STY140NS10 with 140A at 100V.
And for a P channel the SUM110P06-08L with -110A at -60V could be useful. Cheers.
Anthony
November 15, 2017 at 6:45 am
Very interesting repair Waleed. Good job !
Yogesh Panchal
November 15, 2017 at 2:30 pm
Congratulations!waleed.
sagar
November 15, 2017 at 8:52 pm
genius
Justice
November 15, 2017 at 8:57 pm
Mosfet replacement, wow Waleed.
Muhammad Ashfaq
February 26, 2018 at 3:37 pm
AoA sir waleed good work done .