SOLVED Madbean total recall

[Phil hodson]

Morning all.

It pains me to post this here as I took my time on this one as I knew it’s a complex built. I was hoping to beat @MichaelW to a build report but we both hit problems at the same time. He got a new board and got it working. I’m persevering with mine thought as I want to know what I have done or not done!

So before I loose my patience and or my mind and start ripping things off the board I thought I would ask around on here. I know there are some very accomplished builders and some total recall experts here!

Firstly I have checked values. Cleaned the board. And started an audio probe.

Going from the main audio schematic it’s all good. I get a squeal on pin 3 of IC3 not sure if that’s an issue.

Audio stopped at C14 so I replaced that and it’s fine now. All the way to D in. After that nothing.

I her audio on pin 3 and 4 of IC6 but no delay at all.

Looking at my voltages everything looks good apart from IC4. I get nothing at all ok the right hand side.

I also get no voltage at pin 7 of IC7. Could this be related to the issue at IC4?

My thoughts is a bridge or issue in the socket for IC4. Before I take it off does this sound like it might be the issue?

Any thoughts and suggestions very very very welcome!

See attached pics. Can take more as required.

Phil

 

[Feral Feline]

Was so happy to see that icon:



Knew you'd get to the end eventually...

Congrats Phil and everyone else who contributed — as JamieJ said, way to persevere!

 

[Phil hodson]

It wasn’t really me though. I was just doing what I was told. There were some great minds involved. I was worried about IC4 but never put it down to a faulty voltage reg.

Sometimes an outside set of eyes helps you see the wood for the trees!

Was great to get it finished though. That’s a good feeling.