Jfthrasher

A8l 2004. The mmi screen and radio would go on and off randomly. Removed center console and opened up controls and cleaned curcuit board and found stuck button. Cleaned and put back together and everything worked great except car button. Removed again and cleaned that area on curcuit board and reinstalled now I have nothing seams all power is gone. Any thoughts would be appriciated.

Thanks
Jamie

MP4.2+6.0

If you did it with just air, an electronics solvent or rubbing alcohol that dried, it should be okay, and I would recheck connections and then wherever the fuse is. If you used a water based or non quick dry solvent (409, Windex, whatever) unfortunately you may have fried it with power applied.

Jfthrasher

I used an electronics quick dry plastic safe solvent. I couldn't locate a fuse for tuner. I did find the fuse for the nav system and it was fine. Still get no lights sound land screen does not open.

mishar

Screen won't open if it is muted. Try pressing the volume button.

Jfthrasher

I have pushed all buttons. And still nothing Even tried the three button reset and system does nothing.

Went ahead and orderd replacement control .. We will see if that does it.

Jfthrasher

Replaced control buttons in center console and still nothing.

Checked fuses on both sides of dash and on both compartments in truck. All look good
Any suggestions?

mishar

Have you replaced only buttons or circuit board too?

VCDS scan would be the next.

Jfthrasher

Complete new assembly buttons and circuit board

Jfthrasher

Having scan done tomorrow

Jfthrasher

Spoke with mechanic and he said he had never seen such.... The scanner makes no connection to mmi units. He said it was like they were not there. We are all scratching our heads.