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I'm in Russia, there are no specialists who repair obsolete Apple computers here, even finding a RAM for old iMac is a problem. If in US/EU there are at least hundreds of people collecting old computers, then in Russia there might be dozens or less. Shipping to US and back is too expansive (I...

Well, there is a problem — I'm in Russia, not sure that I would be able to find someone who repairs obsolete Apple computers. And shipping to US and back is too expansive. I think that this particular problem could be caused only by certain components' failure, unfortunately nobody knows these...

I have little experience in repairing such a complex electrical devices, can you give me a few hints? I've also replaced QP2 / IRFBC40 (mosfet), but still the same thing. I guess I'll replace every component on the analog board eventually... The voltage is still low.

Replaced the big 400V, 220Mf capacitor as well. Still no changes.

So, guys, I've finally got those chips (had to buy 35 of them and wait for several weeks), changed it, but everything is the same — perfect black and white rectangles. What's next?

Thanks a lot!

I just bought a Studio Display (M4551), with no power adapter and unfortunately this kind of adapters could not be found in my area. I've seen few items on eBay, but they were too expansive and including shipping to my destination it would have been more than 3 times more than the cost of the...

Okay, but can I somehow test this component, to know for sure it has to be replaced? I wish to know it for sure, cause I have to order this chip with delivery within up to 3 weeks, so if the reason is not the opto-isolator, I'd waste pretty much time waiting for the replacement parts...

http://ru.mouser.com/ProductDetail/Vishay-Semiconductors/CNY17G-3/?qs=%2fjqivxn91cdU561RMf2UFw%3d%3d This one?

Okay, but I still don't have any idea of how it looks like. Is it possible to replace it or is it this machine specific?

How does it look like or is it somehow signed on the analog board? Is there a way to test it to know it's corrupted for sure?

Just checked the voltage from the analog board. +12V and -12V — 22,5V +12V and ground — 11V +5V and ground — 4V So, what components on the analog board could cause lower voltage? I can replace all the capacitors left, but it would be much better to know the reason. I would like to know what...

Yep, it looks like the problem is in the logic board, but in that Mac Classic story the logic board and those microchips near the capacitors were undamaged with no significant corrosion. That story seems important to me cause it's the only case where the pattern on the screen is exactly the same...

Thanks, I'll check this tonight! But what might cause lower voltage? Yes, it seems strange for me that he didn't tested both analog boards and compared the result...

For the caps I've replaced I'm 100% sure everything is okay cause I checked every capacitor, its placement and +/- position before replacing it and after. The analog board is in very good condition, with no leaking caps, as I removed the dust, it looks like new. Maybe some other capacitors are...

How can I resolve this issue?

I have 4 and 11 Volts there. The most of the board is just darkened, the only place really corroded is at the small chip signed as VR1 near the four caps, two of its legs were pretty corroded and I'm not sure if they are properly connected to the board. I've scratched off the oxides with a...

How can I measure voltages? I have a multimeter, but don't know where to measure voltages in this computer.

Not sure what is that, can you explain?