Mamba Max repair

[GriffinRU]

Originally Posted by Sammus

• Check Power at node 20 should be Battery voltage OK
• Check 5V at pin 8 of SO-8 chip on the same side with MCU, node 20 is pin 1 of the same chip. ~5.6V
• Check 10V at pin 1 of SO4A (small 6pin IC) ~5V
• Check 10V at pin 1 of SO-8 FET drivers Are they the three next to the SO4A? If so, I get ~4.7V on each pin 1
• Check all diodes, 3 pin IC's
• Remove excessive heatsink compound from MCU pins

Also, when checking the FET drivers I slipped, shorted two pins, lots of smoke, and now no power :( oops

NOTE (not for Sammus): AT THIS POINT, I AM ASSUMING SKILLS BEYONG SOLDERING IN FIXING AND DEBUGING.

5V - not good should be 4.8<V>5.2
Fet's power voltage doubler doesn't work
Yes, and voltage should match output of doubler.

smoke not good, but what you can possibly short? All the power at fet's control is current limited...

Step one would be to fix 5V, than 10V. Go slowly, even remove/unsolder SO8 Fet's drivers (3 chips on the end) and restore power first. Check for shorts and blown components, remove power fet's board if it helps ( you do not need it for brains testing).