What are suitable replacement chips for iivi, iivx, and 600 ROMs

[jajan547]

Hello looking to see what a suitable chip replacement for the iivi, iivx, and 600 family would be. I'm at a loss with my current iivi board(s) and would like to see if as a last ditch effort this resolves my troubles.

 

[joshc]

What are the symptoms of your boards and what have you tried so far? What have you ruled out?

 

[jajan547]

Ih goodness well on one it has no life really. There is no sound, it's been recapped, there is no video, traces all look intact after some small little corrosion repairs, that being said soft power works and the LED turns greens and I get floppy/HDD activity, that's it. On the other it's been recapped it looks to be in excellent shape, soft power works, LED works turns green, SCSI spins and floppy has activity. What's different on this one is that we get a grey screen every time but like the other board no audio. Power supplies are confined working and all caps and any traces nearby have been checked, boards have all been cleaned.

 

[jajan547]

Also where in the world can I get a SOP 40 adapter for my TL866ii Plus?

 

[joshc]

I had a 7100 with similar symptoms and most people I asked suggested it was caused by a stuck bus. You really need a scope and have to start poking at stuff to see what's really going on with these boards. I'm no expert with this level of diagnosis though, but I doubt it's a ROM thing. If you've got hard drive activity, then the machine is probably booting, so it's past the stage of reading from ROM as part of the startup process, but something is stopping video/audio from working? I could be on the wrong track there but that's my thoughts on it. When you say hard drive activity, do you mean that the drive has powered up, or that it's actually reading from the disk?

 

[jajan547]

it's spinning, but no idea what could be causing the issue, I have a scope brand new but I'm no expert at all and don't know where to look. What's especially frustrating is that because this was sold for 4 and a half months there's very few iivi's and also most people hate them so there is very little information or resources for such machines.

 

[joshc]

Get pinouts for various common ICs, see what is happening on them when you probe each pin. Check where voltages are getting to. Check the pinout of the 68030, is there any activity there, and so on. I think based on the symptoms you've got, you need to poke at these boards and try to narrow it down to a particular area. It sounds like they are partially functioning so they may be fixable.

 

[jajan547]

I'll see what I can do.

 

[trag]

Also where in the world can I get a SOP 40 adapter for my TL866ii Plus?

You might check whether the SOP 40 has the same dimensions as the SOP or PSOP 44, but it shorter. If so, you probably use the same socket and just install it at one end.

Here's a datasheet for a chip that uses PSOP 44 so should have dimensions. For that matter you could use two of the chips in this datasheet, but that doesn't help you with reading the originals...

PSOP 44 is available for TL866II+.

Plus, I agree with Josh that's it's probably not a ROM issue.

 

[jajan547]

Thank you I'll look into this board more I find it super bizarre so could it be a stuck bus?

 

[jajan547]

Both boards have been sent off to @WillJac I have been trying to get these to work and just can’t. I think @joshc may be on to something with the stuck bus, as the CPU on one got garbled signals.