Mac IIci has a lot of issues. Don't know if related or not

[dangil]

I have a IIci that boots, but has strange audio issues and random lockups

After a full recap, it boots, without chime.

if the Simple Beep is selected as the alert sound, the machine locks up when an Alert comes up. switching to a different alert sound and putting audio to mute allows me to receive an alert without freezing.

also, the TCP/IP control panel for example freezes the machine when opened. tried 3 different system 7.5 HDs with the same effect.  a few other softwares freezes it too, but I couldn't find a link between them. Norton System Info CPU/FPU and Video benchmarks all run fine.

With the Cache Card installed, it will power up but won't show any video. the card was recapped too.

could this be a bad audio chip corroded by leaky capacitors?

I tested continuity around the board without issue

I had one CPU pin bent during repairs, but managed to straight it up . continuity tests appear OK. the bent pin is pin 124 on the CPU, labeled DS on BOMAC schematics. (datasheet says  [SIZE=11.6023px]Data Strobe[/SIZE][SIZE=11.6023px] DS [/SIZE][SIZE=11.6023px]Indicates that valid data is to be placed on the data bus by an external [/SIZE][SIZE=11.6023px]device or has been placed on the data bus by the MC68030).[/SIZE] if it were cut, could the machine still boot and display video, but freeze with a Simple Beep ?

 

[Mr SN]

With the Cache Card installed, it will power up but won't show any video. the card was recapped too.

I've seen corrosion from bad caps on Cache cards cause the problem you describe.  

On your motherboard, there's a good chance that you have corrosion on nearby chips causing some of your problems. 

Can you post a high res picture of the motherboard?  Cache card too if you like. 

Here was a cache card where one of the chips was so corroded I had to remove and resolder it back down.

Then I found two traces that were broken and I repaired those.  I didnt take a picture of when I was completely done after removing all the solder and making sure the solder was smooth, but you can see where the fix was done.

 

[bibilit]

I will suspect the audio chip having a problem. 

On many boards this chip is also responsible for the reset line going to the CPU. 

I have seen many times the audio chip preventing the computer from booting. 

So  probably another contamination issue.