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Monowheel doesn't start


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I have a problem with my monowheel (this model http://monowheel.fr/boutique/home/9-monowheel-light.html), it doesn't start. I open it on motherboard side, the 60v is ok on the motherboard but there is no 5V. The voltage on in and out pins of the 78M05 regulator is near 0V. The capacity near the 78M05 was "explosed" i change it but nothing change. I think the B861 transistor is dead. There are no R58, R59, R60 i don't know if it is normal the R69 semms to be broken. Somebody have the plan's motherboard, is it possible to find a spare of this motherboard on net ? 

Best regards



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