Pint controller repair
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I took a Pint controller, both boxes and a stock battery but no bms in part trade at $50 value. However, the controller suffered damage from a vnr that shorted out.
Testing the controller revealed a massive short that blew the fuse on my test harness.
Probing with a ohmeter showed a short between a phase connector and ground, so further testing came up with shorted mosfets controlling that phase connector.
I didn't have new mosfets, but I had harvested a few used ones, it was straight forward hot air replacement. I ordered new mosfets now TPH2R608NH
The controller works well now and been patched with Rewheel.
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@lemur amazing work!!!
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I really want to do stuff like this
This is actually awesome
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@lemur Nice work!
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I’m fixing the same thing myself, I undid the solder on the same mosfets on the controller but they still won’t come off the board. Is there solder underneath too that needs to be taken off? If not how did you manage to remove the mosfets
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@joeygiamportoneg Use this for removal and install.
https://www.amazon.ca/Digital-Rework-Station-Desoldering-Nozzles/dp/B08GC3HXCM/ref=asc_df_B08GC3HXCM/?tag=googleshopc0c-20&linkCode=df0&hvadid=560465785608&hvpos=&hvnetw=g&hvrand=3115724733706090752&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001541&hvtargid=pla-969827908942&psc=1 -
@lemur how did you test the MOSFET? Something in my controller is causing a short but I don’t know how to test the MOSFET. Any tips would be awesome!
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@aiden1983 Probe the areas red "x" to red "x" and green "x" to green x with a ohm meter set to 200k and there should be no continuity.
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@lemur thank you! The pint is slightly different but I was able to see than 4 out of the 6 MOSFET were blown. Took them off my board and no longer have a short. Just need my replacements now :)
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@aiden1983 Sorry, I got mixed up with another post asking about a Pint bms.
These are the mosfets you need.![IMG_E0063[1].JPG](/assets/uploads/files/1753805398575-img_e0063-1-resized.jpg)
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@lemur thanks for the reply! I removed the mosfets and noticed that on Q2 the source and drain are still short. Do you have an idea what component could be causing the short still? It is only in this location and it doesn’t appear that I have any solder bridges.
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@aiden1983 Do you mean there's still a short between the source and drain with all the mosfets removed?
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@lemur yes I believe so. When I measure the resistance I get approx. 850 ohms from the source to the drain. When the new mosfets are installed the diode mode shows voltage in both directions (source to drain and drain to source). I’m just trying to figure out what else could be blown causing these readings.
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@aiden1983 At this point I cannot give you any good advice, just guessing.
Just be aware throwing parts at it may not be cost effective and may cause a massive short that can cause a fire, ask me how I know.
I always plug in the battery outside after a repair.
Maybe look for a working Pint controller circuit board instead. Sorry.
