It seems to have tripped out my whole system and this was incorrectly diagnosed by Cancom as a fault with the power supply in my G5. Having sent it off to their service centre at great expense I was told that the system is 100% ok. It wasn't until I got it home after 2 weeks away & tried plugging the monitor back in when it became apparent it was the screen. The power supply in the Mac just makes a 'click-click click-click click-click' noise, whether I have the screen plugged in on switching the mains on or if I tried to plug the screen in while the Mac is running. My limited electronic experience leeds me to feel this may be a fuse problem in the monitor & the G5 has a safety cut-out built in, but I'm just guessing.
I do not really wish to pay a large sum to ship it to Formac only to find it is non-repairable (as I have already done so with Cancom). It would of course make me particularly unhappy if I find I do need a new screen as it is still under 4 years old & at £410 that's over £100 per year running costs which I find unacceptable.
Any help or advice you can offer would be most appreciated.
Right I got my formac monitor open by removing the Bezel, it's tricky
but not too hard. The casing is suprisingly flexible and forgiving. The
clips are backed by a double sided tape on all four edges. Start from the top and give the tape time under tension to come unstuck, it will, a bit like a plaster. Oh yes, unplug before continuing. Inside there are four HEX #4 (5/64 inch) screws holding the display inside the chassis. These can be removed, on the back side of the panel is the power/controller board. And remaining in the chassis is the Cold Cathode power board (long thin one on one side). This can be unplugged to get more range on the cables. (remember which way it goes in, I use a marker pen over the plug and socket to show me where to put it back) The Controller board has a number of power components. Firstly there are 5 power diodes, they all seem to respond properly under a meter in my screen. There remains one linear voltage regulator LT1117 and two 500Khz Step down switch mode regulators, LT1374. These devices are most suspect for causing the over current draw. Replace them if you can do this with ease. However most regulators have inbuilt protection. So it is also possible that a support component such as a resistor or capacitor has failed causing the other components to operate outside of their intended parameters. I will post some pics of the board later.
what happened to my G4 is--as i was on it, it just gave in--tic tic tic..black image on the screen and no more power. the computer turned off with the Formac monitor turning black, and then i could not get the mac to turn back on. turns out it was not the computer, it is the monitor: i can turn the mac on IF the monitor is not plugged into it; but if it is, it'll act as if there's no electricity; and if i attach the monitor while the mac is on, it will turn off the computer at contact.
could this be the same as above, or still a different issue? no idea on how to procede..
thanks for any advice,
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