I'm sorry but do you really think that the 10 other chips you have purchased, all from different manufacturers and different vendors are ALL faulty??

Please stop messing with this board right now before you destroy it beyond repair. Send it to someone who "might" still be prepared to take on the repair because it is plainly obvious that you really need to come to grips with your electronics skill level.

If you want to progress electronics, please do it the correct way, don't do it by destroying boards that are irreplaceable.

Flame away - I don't care if people can't handle the truth.

Three is also not one original one! The chances of two additional chips being faulty are so remote.......

The software is reporting "bad PIA" - that only means it can't access the PIA NOT that the PIA is bad.

I suspect this "report" is being taken too seriously by the OP and that other options need to be explored BUT I hope the further different new chip cures the problem for him - he will make it to 10 new ones in no time at this rate.

I see at least two other posters who have offered you this advice in this very thread and also some writing comments that make it clear they are exasperated by your responses basically ignoring their advice. I picture them banging their heads against the wall when they read your responses to their comments.

So I will recap the advice that you have already been given by others:

With the power OFF and preferably the board on the work bench, using a multimeter (preferably set to 'beep' for continuity) grab the schematic and measure each and every trace that connects EVERY pin on the PIA socket to EVERY other place on the PCB. Sometimes this might be two, three or more connections to other places for each pin - check them ALL. Yes, this is a time consuming job and could take 30 minutes or more. That's one reason board repairs cost more than some expect.

If any one of the pins on this 40 pin chip isn't connected correctly, as the circuit was designed originally, the software will 'flag' the PIA as 'bad' because it can't access it so it could be ANY single pin from the PIA that causes the exact same response from the program EVEN THOUGH there may not be a single thing wrong with the part.

This is what any good tech would do in a situation like this because it's a well known issue with most boards from machines of this era.

If you don't know what is meant by this method then you most certainly should not be playing around with this board that is delicate and very easily damaged. Changing sockets, for example, often causes many more problems than it resolves.

Best of luck with it.

What you are doing is measuring the continuity of the PCB traces. These are just basically wires joining "point A to point B". In the picture below (randomly found on the net) you can see the traces - just think of these as tiny wires.

Pull the board out of the machine - remove any plugged in chips in the area you are concerned with, get the schematic (wiring diagram of your board) and start at pin one of the chip in question. See what it connects to according to the schematic, identify those two points and measure between them with a meter to ensure that they are indeed connected by the PCB trace.

It takes time but if you go at it methodically, perhaps tick off each pin as "good" with a pencil as you go and you will get it done.

soundcpu6 (resized).jpg