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Thread: Trouble getting 386 board to POST, could anyone give me some pointers?

  1. #11

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    Quote Originally Posted by T-R-A View Post
    I concur. Looks like the trace itself also may have some corrosion as well. I'd consider pulling out C10 as well to see if there's any damage/corrosion underneath it as well. It appears that the trace runs from C10 itself to the via just above the positive side of the (now missing) battery (but removing C10 would confirm or deny that). Continuity should be checked on that trace to the via. It also appears there may be some residue to the right and above R43 (around the U24 IC --- two vias above also look to be questionable as well). A fiberglass scratch pen can aid in determining this...
    There is continuity between R43 and D2 as well as R42 and Pin 1 of the jumper above on either end.

  2. #12

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    Quote Originally Posted by appiah4 View Post
    There is continuity between R43 and D2 as well as R42 and Pin 1 of the jumper above on either end.
    Think you may have missed my point. The region I refer to is highlighted in the attached photo. They look questionable:

    board.jpg

    Also some issues could be under the large IC (U24), given its' proximity. You'll have to desolder it to be sure.
    Last edited by T-R-A; June 2nd, 2019 at 03:38 PM.

  3. #13

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    The capacitor leg and test point marked green have continuity so although that trace has surface corrosion it is intact.

    The two test points marked green go under the keyboard controller but I will try to find a leg on the IC they have conntinuity with (keyboard controller, cmos or ISA Bus) as they presumably go to one or the other..

    I really dont want to have to desolder the keyboard controller but I suppose it may come to that...
    Attached Images Attached Images

  4. #14

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    After several attempts at getting this board to POST I realized I have no idea what is wrong whatsoever so I bought a debug card. Here's a video of the debug card as well as the error beep in question:



    So it's it stops at code 13. According to several AMI BIOS sources that means it is stuck at "Initializing Chipset Registers". Any ideas what this means and what may cause this? Can it be fixed?

  5. #15
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    Sure it's AMI? You can't get it to POST so it might be something else, like Award. Award #13 is "8259 PIC". Phoenix #13 is "first 64K RAM failure". Try checking every bios on the left side of http://www.bioscentral.com/postcodes/awardbios.htm and investigate all of the causes.
    Offering a bounty for:
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  6. #16

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    Quote Originally Posted by Trixter View Post
    Sure it's AMI? You can't get it to POST so it might be something else...
    Do you really think somebody altered the sticker on the chip?
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

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    There are less snarky ways of wording your reply. No, I missed the sticker completely as it was upside down and I was rushed.

    If it's an AMI BIOS and the code is correct, the CPU needs replacing.
    Offering a bounty for:
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    - A working Sanyo MBC-775, Olivetti M24, or Logabax 1600
    - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

  8. #18

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    I found a more complicated manual for the card and Code 13 for AMI is listed as this:

    "AMI (13)DMA controller#1,#2,interrupt controller#1,#2disa- bled. About to disable
    Video display and initialize port-B. Chipset initialize/auto memory detection about
    to begin. Replace first memory SIMM.(13)Chipset initialize/auto memory detection
    about to begin. Check first SIMM.(13) Interrupt vectors initialized."

    DMA Controller and Interrupt Controller disabled steps are shared with Code 12 and that one passes, so the latter half of the code must be the issue I think. That means it's complaining about Chipset initialize/auto memory detection. It's complaining about first SIMM I suppose? Maybe I need to try with more sticks of RAM?

  9. #19
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    Try moving the stick of RAM you have installed to another memory slot. Also, try adding at least two. Follow the manual's recommendations for what slots to populate first.
    Offering a bounty for:
    - The software "Overhead Express" (doesn't have to be original, can be a copy)
    - A working Sanyo MBC-775, Olivetti M24, or Logabax 1600
    - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

  10. #20

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    Quote Originally Posted by Trixter View Post
    Try moving the stick of RAM you have installed to another memory slot. Also, try adding at least two.
    On a 386sx with 30-pin SIMMs, one bank of memory is two SIMMs. It's not going to work right with just one, no matter what. You may have other problems with the board, but this one is at least easy to fix and you can cross it off the list of potential causes. There were two present in the photo attached to the OP, though, so maybe this is already good.

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