I have an Osbourne 1 that I am trying to restore. It's round two. I first looked at it in 2009. A capacitor in the power supply went pop, so I replaced the three similar ones on the power supply.
Once that was done the PC started to work seemingly well for a few days. But then it suddenly failed, and there was nothing on the screen. I put it aside at that point.
But I have opened it up to inspect it again, with a mind to get it going.
The power supply looks visibly fine. (I will get to measuring the voltages it produces soon).
But open inspecting the motherboard, I found that the Reset pin on the Z80 has melted, like an awful current has been through it. (pictures attached. The Z80 has, in this photo, been lifted by me from the socket).
Can it be said was the likely prognosis is for this. If the Reset pin on the Z80 has been zapped, how wide spread is the likely damage? Is is worth just trying to replace the Z80 chip? (subject to testing the power supply).
Kind regards,
Richard
Once that was done the PC started to work seemingly well for a few days. But then it suddenly failed, and there was nothing on the screen. I put it aside at that point.
But I have opened it up to inspect it again, with a mind to get it going.
The power supply looks visibly fine. (I will get to measuring the voltages it produces soon).
But open inspecting the motherboard, I found that the Reset pin on the Z80 has melted, like an awful current has been through it. (pictures attached. The Z80 has, in this photo, been lifted by me from the socket).
Can it be said was the likely prognosis is for this. If the Reset pin on the Z80 has been zapped, how wide spread is the likely damage? Is is worth just trying to replace the Z80 chip? (subject to testing the power supply).
Kind regards,
Richard