chadjmccolm
commented
7 years ago Power is coming from CPBRBIN is leaving to CPBRB. I believe this is because the Q16 component is not soldered into the board correctly. This would result in everything turning on. I don't know why everything turns on only momentarily.
The lights D3, D11, and D26 probably turn on because they are very low amperage and the amperage building capacitance at the mosfets would be sufficient to turn them on only until capacitance has reached it's maximum and the amperage drops to 0. This is supported by switching the board on and off quickly. They will only light brightly once beacuse the capacitance at the mosfets has yet to drop.
There is also a trace that has fallen out of the board on the base of the Q16 transistor.
I would like somebody with more knowledge of building boards to connect the transistor at Q16 and try debugging again.
Context
At comp something shorted on the rear power distribution board. It now no longer requires the reset button to be hit to be active, and upon GLV turning on it momentarily turns on multiple circuits (including the engine starter). This should not happen. Schematics for the reset circuit and rear power distribution can be found on the google drive. Also note: for the engine starter to be tripped both it's fuse and the relay (which is currently missing since it was removed at comp and not put back) must be in place.
Outcomes
Constraints
Pinouts must remain the same
Related Issues
A potential short may have occurred in the wiring harness end on the left side where there's no pin cap; additionally, there is a free red wire near the end of the harness (I believe TSMS) which may have been powered by the power supply when debugging at comp when it shouldn't have; both of these may have caused or contributed to the trouble with the rear power distribution board.
Steps to reproduce behavior
Power AMS & IMD lines to reset circuit and turn on GLV, many breakout circuits will momentarily turn on, including the engine starter. The reset button should have to be hit before anything on the rear power distribution board is powered on. Note: the MicroSquirt light should always be on once the reset switch has been hit and AMS & IMD are powered, this is because the MS should never turn off and serves as a useful debugging tool.