Will not power on, no boot, no response.
This MacBook had been sitting a while and now will not power on. Worked fine previously. Power cable works, touchpad does NOT click (possible indication of power and no screen), Shift-Control-Option-Power OR Fn-Ctrl-Cmd-Power (both used to "reset" or dissipate energy presumably) and then power button after to start the system does not work.
Disconnecting the battery management unit flex cable and battery power connector and using just the power cable with the above options also did not work.
I presume there is a short on the logic board.
Any other suggestions or potential solutions to confirm the problem is the logic board? Any guides for tracing and repairing chips on the board? I have found a few articles/videos indicating these boards have a habit of shorting out.