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Thread: IBM 9595 Motherboard

  1. #1

    Default IBM 9595 Motherboard

    Title. Mine appears to faulty
    Looking For:
    IBM PS/2 8595 Motherboard
    MCA sound card (will pay big bucks)
    IBM PC Server 720/others

  2. #2

    Default

    It's likely your board just has faulty capacitors and that you could find the bad ones with a multi-meter and replace them yourself (if you know how to solder anyways).

    If not though and if another member on here doesn't have one to spare there are a couple up on FeeBay, for the FeeBay premium of course...

    This one is up in Canada for $200...
    https://www.ebay.com/itm/92F2623-06H...oAAMXQcVNQ57YC

    And this one is in the UK for $150 with shipping...
    https://www.ebay.com/itm/IBM-92F2623...4AAOSwglJdHeTu

    Alternatively, you could post a wanted ad in the "Vintage Computer Services Offered / Needed" section of the forums and see if anyone would be willing to troubleshoot and repair your board for you.
    Last edited by ButINeededThatName; July 9th, 2019 at 08:51 AM.

  3. #3

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    Quote Originally Posted by ButINeededThatName View Post
    It's likely your board just has faulty capacitors and that you could find the bad ones with a multi-meter and replace them yourself...
    How do you find bad capacitors with a multimeter?
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  4. #4
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    Quote Originally Posted by Stone View Post
    How do you find bad capacitors with a multimeter?
    You remove them, then measure the resistance across the legs. If they are a dead short, or very low resistance, then they are probably bad.

    IBM 5160 - 360k, 1.44Mb Floppies, NEC V20, 8087-3, 45MB MFM Hard Drive, Vega 7 Graphics, IBM 5154 Monitor running MS-DOS 5.00
    IBM PCJr Model 48360 640kb RAM, NEC V20,, jrIDE Side Cart, 360kb Floppy drives running MS-DOS 5.00
    Evergreen Am5x86-133 64Mb Ram, 8gb HDD, SB16 in a modified ATX case running IBM PC-DOS 7.10

  5. #5

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    Quote Originally Posted by ButINeededThatName View Post
    It's likely your board just has faulty capacitors and that you could find the bad ones with a multi-meter and replace them yourself (if you know how to solder anyways).

    If not though and if another member on here doesn't have one to spare there are a couple up on FeeBay, for the FeeBay premium of course...

    This one is up in Canada for $200...
    https://www.ebay.com/itm/92F2623-06H...oAAMXQcVNQ57YC

    And this one is in the UK for $150 with shipping...
    https://www.ebay.com/itm/IBM-92F2623...4AAOSwglJdHeTu

    Alternatively, you could post a wanted ad in the "Vintage Computer Services Offered / Needed" section of the forums and see if anyone would be willing to troubleshoot and repair your board for you.
    Yeah I looked on ebay, both of those are really overpriced, only a few years ago they sold for $50-60 and a seller I offered wanted $125 minimum. No thanks lmao

    The entire saga is here https://groups.google.com/forum/#!to...re/1kv-wRmqzG8

    of me trying to find out what is wrong with it.

    It's very strange, but since you fixed what like half a dozen 9595s maybe you can help. Long story short, I bought the 9595 off ebay, and it worked just fine until I went to change the battery (because I figured it had been in there the past 20 years and was likely to die soon)

    After I did that, was when it started acting strange. Getting stuck when the LED display was at "CP 01" with no video, it only recovers from this if I take the battery out for a fair bit and repower. When I configure the computer again with the reference disk I get some errors, after the computer is powered off for a bit, it sticks on CP 01 again and the cycle repeats.
    https://i.imgur.com/cBIo015.jpg
    This one with the diagnostic disk

    https://i.imgur.com/LRNdPFb.jpg

    I might finally invest in a multimeter (and soldering iron) since replacement boards are so darn expensive. Gonna give the board a good cleaning first. I think I may see some leaking capacitors - some of them have white residue on the tops of the cans. They're nichicon caps which are a reputable brand but I suppose time makes fools of them all? It's difficult to get a clear picture of the residue.

    One of the Dallas chips has some white residue on the fingers

    https://i.imgur.com/bBqBSye.jpg


    Other than the white residue on the dallas chip and on a few of the caps the board looks alright... fairly clean really.
    Looking For:
    IBM PS/2 8595 Motherboard
    MCA sound card (will pay big bucks)
    IBM PC Server 720/others

  6. #6

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    Quote Originally Posted by Culbrelai View Post
    Yeah I looked on ebay, both of those are really overpriced, only a few years ago they sold for $50-60 and a seller I offered wanted $125 minimum. No thanks lmao

    The entire saga is here https://groups.google.com/forum/#!to...re/1kv-wRmqzG8

    of me trying to find out what is wrong with it.

    It's very strange, but since you fixed what like half a dozen 9595s maybe you can help. Long story short, I bought the 9595 off ebay, and it worked just fine until I went to change the battery (because I figured it had been in there the past 20 years and was likely to die soon)

    After I did that, was when it started acting strange. Getting stuck when the LED display was at "CP 01" with no video, it only recovers from this if I take the battery out for a fair bit and repower. When I configure the computer again with the reference disk I get some errors, after the computer is powered off for a bit, it sticks on CP 01 again and the cycle repeats.
    https://i.imgur.com/cBIo015.jpg
    This one with the diagnostic disk

    https://i.imgur.com/LRNdPFb.jpg

    I might finally invest in a multimeter (and soldering iron) since replacement boards are so darn expensive. Gonna give the board a good cleaning first. I think I may see some leaking capacitors - some of them have white residue on the tops of the cans. They're nichicon caps which are a reputable brand but I suppose time makes fools of them all? It's difficult to get a clear picture of the residue.

    One of the Dallas chips has some white residue on the fingers

    https://i.imgur.com/bBqBSye.jpg


    Other than the white residue on the dallas chip and on a few of the caps the board looks alright... fairly clean really.
    Hey... I know you! I'm the fellow Redditor that explained what the CP codes you were getting meant. Sorry to hear you're still having trouble with it.

    So yeah, according to the second photo the system is effectively telling you something on your system board has died. My first question is this: Googling the FRU your system lists in picture two for the system board brings up the result for the older style board for the 8595, not the 9595. The differences are minor, though I would like to know which you have and what type complex you're trying to use with it. The older has only one serial and parallel port on the back and can't use the Type 4 Pentium complexes to their full potential and the newer has two serial and two parallel ports on the back and will barf up a 172 error code if you stick anything other than a Type 4 Pentium complex into it (I'm not sure if that includes the 50MHz M complex though).

    From how you've explained the state of your system board and the issues you're having I can really only give you an educated guess as to what's happening...

    So, that white residue may very well be corrosion. I've seen it in several systems that have those god awful NiCad barrel batteries that when they go bad, usually just vomit acid all over the board. What's even worse is that when there's an appreciable amount of it and if given enough time, it will "creep" up wires and traces to other parts of the board (I have a 5155 portable that this happened in) and if it's bad enough just warrants replacing the whole damn board. Anyways, my best guess is some of the capacitors on the same circuit as the clock / battery have lost their lunch, but you didn't see any errors other than 161 / 163 as the battery was dead and those circuits were thus unpowered, concealing the larger issue (failed electrolytics). Most likely when you installed a new battery and powered said circuits you simply just brought the real issue to light. This also would explain why this odd behaviour stops after you remove the battery and let it sit awhile. If I were you I'd definitely just replace all of the capacitors on that section of the planar and see where that gets you.

    By the way, if it's all right with you I'm going to qoute this whole conversation and post it in the "Later PCs" section of this forum as that's really the appropriate place to discuss troubleshooting for this system and you may get some more advice from other members there.

  7. #7
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    Dublin, CA USA
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    Quote Originally Posted by ButINeededThatName View Post
    By the way, if it's all right with you I'm going to qoute this whole conversation and post it in the "Later PCs" section of this forum as that's really the appropriate place to discuss troubleshooting for this system and you may get some more advice from other members there.
    No need. I moved it, and tweaked the title.

    IBM 5160 - 360k, 1.44Mb Floppies, NEC V20, 8087-3, 45MB MFM Hard Drive, Vega 7 Graphics, IBM 5154 Monitor running MS-DOS 5.00
    IBM PCJr Model 48360 640kb RAM, NEC V20,, jrIDE Side Cart, 360kb Floppy drives running MS-DOS 5.00
    Evergreen Am5x86-133 64Mb Ram, 8gb HDD, SB16 in a modified ATX case running IBM PC-DOS 7.10

  8. #8

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    Quote Originally Posted by ButINeededThatName View Post
    Hey... I know you! I'm the fellow Redditor that explained what the CP codes you were getting meant. Sorry to hear you're still having trouble with it.

    So yeah, according to the second photo the system is effectively telling you something on your system board has died. My first question is this: Googling the FRU your system lists in picture two for the system board brings up the result for the older style board for the 8595, not the 9595. The differences are minor, though I would like to know which you have and what type complex you're trying to use with it. The older has only one serial and parallel port on the back and can't use the Type 4 Pentium complexes to their full potential and the newer has two serial and two parallel ports on the back and will barf up a 172 error code if you stick anything other than a Type 4 Pentium complex into it (I'm not sure if that includes the 50MHz M complex though).

    From how you've explained the state of your system board and the issues you're having I can really only give you an educated guess as to what's happening...

    So, that white residue may very well be corrosion. I've seen it in several systems that have those god awful NiCad barrel batteries that when they go bad, usually just vomit acid all over the board. What's even worse is that when there's an appreciable amount of it and if given enough time, it will "creep" up wires and traces to other parts of the board (I have a 5155 portable that this happened in) and if it's bad enough just warrants replacing the whole damn board. Anyways, my best guess is some of the capacitors on the same circuit as the clock / battery have lost their lunch, but you didn't see any errors other than 161 / 163 as the battery was dead and those circuits were thus unpowered, concealing the larger issue (failed electrolytics). Most likely when you installed a new battery and powered said circuits you simply just brought the real issue to light. This also would explain why this odd behaviour stops after you remove the battery and let it sit awhile. If I were you I'd definitely just replace all of the capacitors on that section of the planar and see where that gets you.

    By the way, if it's all right with you I'm going to qoute this whole conversation and post it in the "Later PCs" section of this forum as that's really the appropriate place to discuss troubleshooting for this system and you may get some more advice from other members there.
    I'm using a P66 complex, 16 MB RAM (from an 8590, since this computer had no ram when I got it from ebay) a Buslogic BT646, XGA-2 and a 4GB HDD.

    I'm going to test the P66 in the 8590 later today to rule that out, the 8590 works it just doesn't have a case or floppy cable.

    XGA-2 and BusLogic are both known working (from using them in a model 80 for a hot while)

    The case says its a "9595-OLG" and the motherboard's FRU is 33F5717.

    Anyone have any recommendations for soldering irons for a beginner? I watch a LOT of electronics repair videos, but I've never done it myself (EEVBlog, AkuBkuku...)

    It's no big loss if I screw up this cactus of a board anyway I suppose.
    Looking For:
    IBM PS/2 8595 Motherboard
    MCA sound card (will pay big bucks)
    IBM PC Server 720/others

  9. #9

    Default

    Quote Originally Posted by Culbrelai View Post
    I'm using a P66 complex, 16 MB RAM (from an 8590, since this computer had no ram when I got it from ebay) a Buslogic BT646, XGA-2 and a 4GB HDD.

    I'm going to test the P66 in the 8590 later today to rule that out, the 8590 works it just doesn't have a case or floppy cable.

    XGA-2 and BusLogic are both known working (from using them in a model 80 for a hot while)

    The case says its a "9595-OLG" and the motherboard's FRU is 33F5717.

    Anyone have any recommendations for soldering irons for a beginner? I watch a LOT of electronics repair videos, but I've never done it myself (EEVBlog, AkuBkuku...)

    It's no big loss if I screw up this cactus of a board anyway I suppose.
    Does it have one of each port (serial and parallel) on the rear or two of each? That way I know for certain what board type you have.

  10. #10

    Default

    Quote Originally Posted by ButINeededThatName View Post
    Does it have one of each port (serial and parallel) on the rear or two of each? That way I know for certain what board type you have.
    It has one of each
    Looking For:
    IBM PS/2 8595 Motherboard
    MCA sound card (will pay big bucks)
    IBM PC Server 720/others

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