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  1. plb007

    PM 8500 no boot

    I still have the card, I can once try to replace the capacitors.
  2. plb007

    PM 8500 no boot

    Hi, I didn't try to replace capacitors on the processor card. I just swap with another one. They are very cheap on eBay ... But I wonder if the captors are the cause of the problem. They look clean but I guess they can leak too.
  3. plb007

    PM 8500 no boot

    Hi, Thanks for your replies. The issue was a bad processor card. Earlier 8600's can use 8500's processor (And the opposite too). It seems that processor card can also gone bad with time (like capacitors on older motherboard).
  4. plb007

    Bodge Wires on LC III Motherboard?

    Here's a pictures of both my LCIII's, one with the "fix", one without (REV D board). Those boards are european, so the problem with early/bad board production was worldwide.
  5. plb007

    Strange card on a mac plus

    Thanks for your answer, I tried to dismantle everything today with no luck. I mean I think I can take it apart but with no idea how to reassemble it later. Some bolt and/or nuts will fall inside the computer and I have no idea how to put them together. For now it's on hold as I need some place in my desktop. There's no need to rush as nothing seems to leak everywhere in the main board. I'll try first to power it as if it is from stock and then add elements one by one.
  6. plb007

    Strange card on a mac plus

    This might be an Megascreen I as there's a cooling fan in the setup. I'll try to take it apart. I can't remove the logic board as it seems to hold a cable to another board. I need to figure out the disassembly order first. I'm impressed how they packed all that stuff inside this small case. I guess there's no hard drive inside. What's the sad mac 02FFFF meaning ?
  7. plb007

    Strange card on a mac plus

    Hi, I have a mac plus with an extra db9 cable going through the security hole and don't know what is it. The computer was heavier than the others. As I have a sad mac icon at startup, I decide to open the computer to have a look inside. The computer is very full of extra component. It looks that there's an extra power supply just under the screen, an extra card at the back of the computer, an extra card packed at the logic board and a extra fan (or a relocation) to cool everything. Does someone have information on this setup ? The back's card has "Micrographic mega screen written) I assume the db9 port is VGA or component (RGB) ? It looks very complicated to remove those cards, lot of extra screws and extra wiring to deal with. Have a look at the pictures
  8. Hi, Following my "classic" and "IIci" failure due to capacitor and battery leak, I went to check my 128k & 512k. As they powers as usual, with sound, bright and crisp screen, is it necessary or recommended to change the caps ? Are they subject to leak as classic and SE30's ? Does analog board and logic board needs recapping ? Is there a "list" of more leaking mac. I see a lot of classic (1&2 + color) and SE30's, but less of the others compact mac. Regards
  9. plb007

    8100 and 8500 PSU pinouts

    Hi, If needed, here's a copy of the PSU pinout .... Regards
  10. plb007

    PM/WS 8500 needs AV module to boot?

    Hi, I have a working 8500 and a WS8550 that wasn't booting. No chime, just fan and hard disc spin. I thought it was the motherboard because of the battery leak, I found a new MB in perfect condition. No luck, same symptoms. It turns to be the processor card. I put the 8500's processor card and it started. I found 2 cheap processors card and one of them was defective. When processor card is defective, there's no boot chime, just the fan and disc spinning, nothing on screen. I really don't know how to check the processor card outside the computer. I can also assure you that the 8500's doesn't need the AV cable to be plugged in nor the PRAM battery to boot.
  11. Hi, I have a lot of old Mac computer here at home, I usually remove the 1/2 AA battery before putting them on storage, but It seems that I forgot this one. It looks in very bad shape. I start cleaning as much as I can and it start to look better. Can you guys help me resurrecting this computer ? I need to source some new replacement component. But which one ? Can the MMU and the Roms be saved ? (Dishwasher ? ) I need to find the little round component that goes off near there Y5 - 32.768 Khz. Is a clock (quartz ?) I'm waiting for your comments. Have a look at the pictures .... Thanks, Pierre
  12. Hi, As part of resurrecting an old PM8500, can I use the processor card from a 8600/9600 series ? I have one that can act as a donor but it's a 350 Mhz processor. I know the internal bus speed won't go faster, but I wonder if the computer will/must be able to boot with that processor card. Regards,
  13. plb007

    PM 8500 no boot

    Hi, I've been reading passively this forum for years. But now, I really need to exchange knowledge regarding one of my problem. I have a PM8500 (WS8550 to be exact), I forgot to remove the battery and that ends with a little corrosion on the motherboard. No startup sound, no video, disks are spinning, but nothing. I clean the motherboard as much as I can with no result. I ended up buying a new motherboard (cheap), switching everything necessary with no more result. It leave me the PSU or the processor card. What can be the problem ? Can I use processor card from 8600 or 9600 or even 8100/8200 ? Which processor cards are compatible with ? I have a lot of old powermac on storage that can help the diagnostic. Any idea ? Thanks, plb