Cheap "high voltage" esc Quest

[rschoi_75]

Ok, I just heard back from Modellfun and they offered to replace my esc. Good news. It shows that they are not just a chop shop. However, in the interest of science, I've sold off my esc to Sikeston34m so he can run some experiments on them.

[sikeston34m]

I received the ESC in the mail today. Thanks.

I cut the shrink off and took a look.

The power board looks ok. I haven't removed the heat sink, but I can see the edge of each FET and they look fine. Usually when a FET goes, it makes a mess.

The caps are bulging and the insulation on their leads is almost fried off. There are 2 of them and they are rated at 35v @220uf. These are VERY small IMO. It would do much better with larger ones or at least multiples of these. About 5 of them at least instead of 2.

The Brain board has problems. It smells burnt. I can see one small component that is fried. I will spend some time carefully unsoldering and lifting the power board to discover exactly what the problem is.

Here's what I think. The BEC circuit on the power board is gone. This has dropped power to the brain board. Thus making it "brain dead". LOL

To test this theory, I was hoping it would become functional being powered with an external BEC. No Dice. So the internal BEC isn't even putting out enough power for the Brain to function.

With external BEC power, the brain board heats up quickly. It definately has a BEC problem.

Were you using an External BEC with this on 5S? Or just the built in one?