An friend just contacted me about his old (But RETRO!!) Commodore 64 which emitted a lot of smoke when he turned it on. I got a picture of the mainboard, which in my opinon not much good, looks like moisture, but i am not sure. Who can give an correct answer?
If you're concerned about the ripples in the copper, don't be. That generation of pcb's typically showed that result from heat buildup during the wave soldering on the large blank copper areas. Normal design practice was/is to use check-pattern or similar ground plane to avoid the heat buildup and copper delamination.
Apart from that, I can't see anything in particular.
I agree. I see no particular signs of moisture damage either. If it smoked, where from ? Plug it back in, and see what smokes again, or just gets hot if it's all outa smoke. Nothing to lose, as it's currently bolloxed anyway ...
64which emitted a lot of smoke when he turned it on. I got a picture ofthe mainboard, which in my opinon not much good, looks like moisture,but i am not sure. Who can give an correct answer?
Back when they were new, the power module had the reputation that the regulator transistors were held against their heat sink by the epoxy potting. After some use, they separated from the heat sink, causing either a failure or a thermal shut-down.
I never had that problem, perhaps because mine was a newer unit. However some people became quite good at rebuilding the power modules.
I find that a surprise, as I once tried to open up a commodore power supply .It was all one big brick of molten epoxy which was to all intents and purposes inpenetrable, at least not without destroying the innards (which i eventually did after hurling it at a wall in frustration ;-)