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Since the previous post, I found that changing the HV caps HAD NOT after all eliminated the startup problems. So, as foreshadowed, I next changed the caps on the small daughterboard. The board is about the size of a large postage stamp and stands vertically off the main PCB, connected by 10...

The specs are identical, so it would be safe to use the RS product. If it is a different manufacturer, serial numbers may differ. there can be minor differences in lifetime performance between different brands and makers, but it would take you a lifetime to find out. See several threads on this...

I think that ebay seller has his Mac models wrong - the Compacts take 4.5v, his item is 3.6v. Also not sure whether a lithium will deliver the peak milliamps that alkaline can do. Anyway, I'm afraid it's the wrong battery. I wonder how long until somebody calls him on it. For an Australian...

@Bunsen The link is OK but that server went down late yesterday. It's not my server so I don't know how long they'll take to get it back up. Shouldn't be long - I edited another post on that blog yesterday. Rick

If you have trouble finding the exact type, or don't like the price, there is a handy hack that I have used. A standard 9v compact alakaline cell consists of 6 x AAAA cells spot-welded head to toe in sided that plastic rectangular package. You can peel of the package and carefully separate the...

There were no signs of trace corrosion anywhere on the logic board. I had cleaned it thoroughly and inspected with magnifying glass. A little bit of green fur on the negative side tag of one of the caps was the only hint of leakage. I think I caught it before any damage. Still a puzzle to me...

Correction to my earlier post (too late to edit). Of course my adapter is DVI+USB+Power to ADC, not VGA. One hazard with the Studio Displays, as they age, is that the control chips inside the display unit can start to dement. Often the extended USB ports and the remote power switch fail, and...

Lust lust :-* Problem for me is freight would double the cost, and something like this unlikely to come up locally before I liquidate (personally, or maybe just my collection). Rick

Well I might as well keep chatting to my self on this. I got a full set of electrolytics for my Sony PSU - just to be sure. Note this is a different Sony PSU to the Plessey one in Bilbit's thread - maybe because this is the "international" 250v model? Or different factory? There are only 3...

... and you don't even have to have the right video card if you are prepared to make a VGA adapter. I found myself with a G3 PowerMac with VGA, plus a 17" Studio ADC. I decided to build an adapter to go inside the PowerMac. Here's my blog on the project Rick

Thanks for the pics. I have replaced those caps. I'm sure it was a good idea anyway, but it didn't solve the ROM problem. I've proven the logic board works OK by swapping in ROM chips from a Plus - it boots fine. Now just waiting for blank EPROMs to arrive so I can copy the Plus ROMs for this...

I've bought a copy of Dead Mac Scrolls and waiting for delivery. The "Repair and Upgrade Secrets" seems harder to find, more expensive and fewer pages. Is there stuff in it that I won't find in the Scrolls? Meantime, by swapping boards and ROMs with a Plus, I'm confident that the 512ke ROM(s)...

Excuse the simple question.. I want to play safe. I have a working Plus logic board, and I have a 512ke that fails ROM read. Replacing electro caps with tants didn't solve it. Is it really safe to swap the Plus ROMs into the 512ke logic board to test? Even better, can I duplicate the Plus...

The other factor is freight, particularly if you live in a place like Australia where the cities are far apart and the whole market is fairly small. I have to add $40-100 for freight to the cost of any machine outside my home town. Postage or freight from USA for a 68k logic board will be...

Well I got deeper into this. Without a proper cap tester, I tried continuity testing across the terminals of all caps in the PSU. No shorts, most showing a ramp up to charge, discharge, and residual resistance. Biblits earlier thread about a cap fix relates to a Plessey PSU I think, but the...

Aurel, I read your other thread. The code beginning "02" is supposed to indicate a RAM error, as you are aware. It seems that your problem is not centred in the ROM, though it may relate to other functional chips that are necessary to the reading of the ROM as well as the RAM. I plan to check...

Thanks bb, that is helpful. I have been able to read the two ROM chips into hex files, by identifying them as 27C512s. Can I use those dumps to verify against a dump from a known good ROM set? Are standard ROM dumps available for comparison and/or burning to EPROM? I know so little about the...

There are four screw bolts that hold the screen back casing to the top elbow of the adjusting arm. By loosening them you can adjust the horizontal angle by a couple of degrees. To get to those bolts, you have to completely disassemble the LCD unit. Putting it back together is quite tricky, as...

I see nobody responded to this earlier. I have successfully connected a 15" LCD to a 17" motherboard. The connectors are the same. There is a difference between the two PSUs, however. The 17" models provide more power to the LCD because the large screen has more backlight. You may find that...

So, you're telling me I need to take the PSU out of its case and check ESR on the major caps? :( Well, I did ask for advice and suggestions. For accurate ESR reading wouldn't I have to desolder the caps? Or can I get away with just putting a multimeter across them and watching the...