Hi,
I got a Makita bmr100 with error displaying and no power up. just 'E' and discharged battery simbol.
It is happening after using a while (30 min) and than constantly. If i stop it will not turn on, or if i leave on after a while will stop it and will display the error.
When i remove the power and reaply it will work a few minutes(depend how long was working).
On the board cannot find anything overheating. The test i've run with/without auxiliary battery and doesn't made any difference.
I've separated the boards and tested independently, the issue is from controller board (display).
During testing i've noticed that when DC-Ref pin 44 of TC9318AFAG controller will drop. don't know if it's the cause or effect.