This is the original PCB from my cab.
The CPU and ROM sockets were corroded and must be replaced.
It was covered in a wax like substance.
When I tried replacing a chip the fumes coming from the board were disgusting.
I can't describe it but one it's of the mankiest smells I've ever experienced.
This was the PCB before being cleaned.
I thought I'd throw it in the dishwasher as I had nothing tho lose, the board was not working anyway and whatever the substance was it made it near impossible to cleanly remove a chip without cutting the legs.
The boards are much cleaner after being washed but now there is no screened mask left, the PCB feels very dry and the smell is still there when you heat the solder on the pins but nowhere near as bad.
The AMP ROM sockets cant be removed by lifting the plastic and desoldering each pin so my only option was to remove each socket whole.
I don't have a desoldering station, only a solder sucker.
This was the process of removing the CPU socket.
Each leg was tinned/reflowed and desoldered, you can see the black crap that form when heating the pin, all pins have been desoldered though you can't see it in the image below.
Top side of the PCB with CPU before refilling each hole and desoldering from the other side.
Top side of PCB with holes cleared and board cleaned as best as possible.
Underside of PCB with holes cleared and board cleaned as best as possible.
PROM chip done.
I now have to remove and replace 25 sockets, approximately 600 pins...
I figure this board is a basket case but will give it a chance to come back to life.
The CPU and ROM sockets were corroded and must be replaced.
It was covered in a wax like substance.
When I tried replacing a chip the fumes coming from the board were disgusting.
I can't describe it but one it's of the mankiest smells I've ever experienced.
This was the PCB before being cleaned.
I thought I'd throw it in the dishwasher as I had nothing tho lose, the board was not working anyway and whatever the substance was it made it near impossible to cleanly remove a chip without cutting the legs.
The boards are much cleaner after being washed but now there is no screened mask left, the PCB feels very dry and the smell is still there when you heat the solder on the pins but nowhere near as bad.
The AMP ROM sockets cant be removed by lifting the plastic and desoldering each pin so my only option was to remove each socket whole.
I don't have a desoldering station, only a solder sucker.
This was the process of removing the CPU socket.
Each leg was tinned/reflowed and desoldered, you can see the black crap that form when heating the pin, all pins have been desoldered though you can't see it in the image below.
Top side of the PCB with CPU before refilling each hole and desoldering from the other side.
Top side of PCB with holes cleared and board cleaned as best as possible.
Underside of PCB with holes cleared and board cleaned as best as possible.
PROM chip done.
I now have to remove and replace 25 sockets, approximately 600 pins...
I figure this board is a basket case but will give it a chance to come back to life.
