I just bought a used mpu board at pinfest for my Mata Hari. The issue is it only blinks four times. I hear a click on the driver board and that's about it. I replaced the rectifier board and connectors going to the rectifier board. Can it be something other than a bad mpu that prevents it from booting up? The last board I had. Broke but before it breaking not all the lights would go on and acted funny. Please help

The middle of the board seemed to have some damage that was covered w green tape. I unplugged all connectors from the mpu except j4 and I still only get 4 flashes.

I just put in a new board with connectors so I don't think it's that. I have a volt meter but don't know how to test it.

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Thanks guys I appreciate it. Should of just bought a new board. The last time this happened I said the same thing. Well that's how it goes.

Thanks so much for spending the time to help. I def won't make the mistake again. I would like to learn how to repair boards. I would save tone of money. Gotta find the right place to start.

It's not the soldering part I'm stumped on its learning the multimeter and going thru the board and finding what's wrong.