kaimaiguy wrote:As I said before I have no clue as to how to do many of these operations. Not sure where to put the probes etc and exactly what I am looking for. What do you mean by " the right voltage" what is the right voltage are we talking mains voltage , board voltage etc etc?
Your manual should help with this. Normally 240V goes into the PSU and DC voltage goes out to the mainboard. Just what this is and just how many DC lines there are depends on the computer. There is amost always a 5V one and often there is a 12V one and a -5V one also (on a computer as old as yours). However, it's possible some of those voltages could be generated on the board itself. Anyway these DC voltages should be at the levels stated in the manual and stready. Check the manual and see where these lines connect to the mainboard. Measure them where the connect or close to where they connect, but before they go through any components. There are lots of other places you could also measure the voltages but you'd have to use the schematic to find them. I'm assuming you know how to use a multimeter?
I agree with ZL2AOX that it sounds like your PSU is shorting. It certainly shouldn't be ticking. It's possible that a capacitor has shorted perhaps or (more seriously) the insulation. If the voltages are out of wack on the board, that would confirm it.
Your PSU would also have a (high voltage) lead to the screen. Unless you really know what you are doing it would be prudent to stay way from this. There are high (lethal) voltages in that area, and the power doesn't even need to be on. I would advise strongly not to go near it with a probe (or anything) until you are a lot more skilled. In fact, a PSU (especially a shorting one) can also be dangerous to novices so I would advise not poking around the PSU as well.
Given the risk factor here, consider that this might be just a bridge too far. I was at about your level when I started tinkering around with these machines but I started on a really well known and well documented machine (Apple II+), had duplicate machines, and the issues were neither PSU or screen. I also had an electronics mate (Philip Avery) to explain and assist from time to time. It took me a while to build up expertise before I would go near a screen or PSU. Even now they still make me nervous.