Sick Iifx?

[jlindsay26]

So I bought a IIfx on eBay in really good shape recapped the electrolytic caps just two and the axials it powers on from the key board every time but chimes and boots randomly. I know not much to go on but wanted to see if any had any suggestions. Currently have a floppy connect a questionable 40mb Scsi drive and an external bluescsi.

 

[jlindsay26]

I’ll add I wondering is it a Scsi termination issue I have termination set for bluescsci not sure how the internal drive is set. But I’ve read post regarding the need or not of the special black terminator.

 

[Phipli]

I'd start by inspecting the softpower circuit. Do a search for softpower issues in this site as a start.

 

[jlindsay26]

Thanks

 

[jlindsay26]

Was a bit bored this morning so I figured I'd look a this again same basic problem. when the computer did boot it froze after a few minutes. decided I try a CPU/FPU swap from my PowerCache, pulled the parts and straighten the pins. The IIfx seems to be running well now. I've boot numerous times with no issues and ran MacTest. No problems yet, curious anyone have any experience with 68030 processors going bad? Any suggestion for sellers to get a replacement CPU/FPU. I may do a bit more part swapping to pinpoint which chip is causing the issue.

 

[Phipli]

Was a bit bored this morning so I figured I'd look a this again same basic problem. when the computer did boot it froze after a few minutes. decided I try a CPU/FPU swap from my PowerCache, pulled the parts and straighten the pins. The IIfx seems to be running well now. I've boot numerous times with no issues and ran MacTest. No problems yet, curious anyone have any experience with 68030 processors going bad? Any suggestion for sellers to get a replacement CPU/FPU. I may do a bit more part swapping to pinpoint which chip is causing the issue.

Never had an 030 go bad.

Daft suggestion, try putting the original back. Perhaps it was just a dirty contact and swapping over fixed it.

 

[robin-fo]

Are the batteries still good?

 

[jlindsay26]

Never had an 030 go bad.

Daft suggestion, try putting the original back. Perhaps it was just a dirty contact and swapping over fixed it.

Good suggestion I'll give that a try, figure it will also help pinpoint if the CPU or FPU is causing the issue.

 

[jlindsay26]

Are the batteries still good?

yep installed fresh ones in the computer about a week ago when I first got it

 

[Bolle]

I had actually seen both, 030s as well as 68882s going bad.
Bad CPU always resulted in no boot at all, bad FPUs showed several symptoms… crashing after some specific time (probably related to thermals), crashing the OS randomly with error 10, just straight up incorrect math calculations.

 

[jlindsay26]

Thanks Boole I’m thinking it’s the FPU. Went downstairs and noticed that Mactest reported the 50mhz FPU failed put the 40mhz FPU back in with the 50mhz CPU and Mactest froze. Flipped things around 40mhz cpu and 50mhz FPU test completed still reported the FPU failed but it didn’t freeze. Rebooted and ram speedometer and it’s reporting the FPU is twice a Mac II so maybe Mactest FPU failure isn’t accurate. Guess I’ll going to go looking for a replacement FPU so I can put my 50mhz one back in the PowerCache card. Thanks to everyone that replied.