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Can a Power Supply for an IBM 5170 be repaired if damaged by shipping carrier?

modem7 said:
Your "type 1" is obviously a typo; you correctly identified the pictured motherboard as a type 3 in post #34.
(FRU-6489922 = type 3).

I see that the photo in post #34 is that of a yet-to-sell eBay item, item 266650606293.


Per [here], the type 3 motherboard was supplied with a 11/15/85 dated BIOS.

Option #1: Find somewhere, a set of original IBM ROM's of the 11/15/85 BIOS. Per [here], IBM used various IBM part numbers for the 11/15/85 BIOS dated BIOS.

Option #2: Have someone program you a set of EPROM's containing the 11/15/85 BIOS dated BIOS. Some people/companies that can do that are listed at [here]. Images for the EPROM's are at [here]. Per [here], for an 8 MHz 5170 motherboard, EPROM's with an access time of 190 ns, or faster, are required. As for EPROM type, use 27256 or 27C256, or per [here], the Winbond W27E257.
Click to expand...
Your right, I did make a mistake on the type. The board in question is type 3; thinking one thing writing another. The picture from Post #34 is the one I bought. It's sitting in a box right now until I clear up some issue before I put it into the case. The seller told me today he has 4 more boards on eBay similar to this one shown in Post #34.

Regarding the EPROM's I have the writer/eraser for the EPROMS along with the chips either Intel 27128 150 ns EPROM or 27256 170 ns chips for EPROM’s7. From your response <Images for the EPROM's are at [here]. Per [here], for an 8 MHz 5170 motherboard, EPROM's with an access time of 190 ns, or faster, are required.> There appears to be two variations, which I downloaded. Which variation would be correct for the motherboard shown in post #34? I am thinking variation 2.
 
alejack12001 said:
Which variation would be correct for the motherboard shown in post #34? I am thinking variation 2.
Click to expand...
Doesn't matter, Variation 1 or 2, Both the same except for part # and checksum. Use the 32k 27256 Eproms

Edit: I noticed in post #34 the board has BIOS roms fitted, Does yours not have them ?
 
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alejack12001 said:
Regarding the EPROM's I have the writer/eraser for the EPROMS along with the chips either Intel 27128 150 ns EPROM or 27256 170 ns chips for EPROM’s7. From your response <Images for the EPROM's are at [here]. Per [here], for an 8 MHz 5170 motherboard, EPROM's with an access time of 190 ns, or faster, are required.>
Click to expand...
Enhancing what Malc wrote:

For the type 3 version of the 5170 motherboard, 27128's are unsuitable.
The "27256 170 ns" are suitable (27256 class, and 170 ns is faster than 190 ns).

alejack12001 said:
There appears to be two variations, which I downloaded. Which variation would be correct for the motherboard shown in post #34? I am thinking variation 2.
Click to expand...
Malc said:
Doesn't matter, Variation 1 or 2, Both the same except for part # and checksum.
Click to expand...
For later users of the web page, I will either add some text explaining the difference, or simply remove one variation (since the actual 'code' portion of both variations is identical).
 
IMG_5255.jpeg
The above picture shows the U27/U47 EPROM's and from what is written on them, the label appears loaded with the IBM EPROM software. So I think, the board is all right, probably doesn't need any further attention.
 
alejack12001 said:
The above picture shows the U27/U47 EPROM's and from what is written on them, the label appears loaded with the IBM EPROM software. So I think, the board is all right, probably doesn't need any further attention.
Click to expand...
Yes, stock 11/15/85 ROM's, some examples pictured at [here].
So, on-screen, the "A BIOS Version 1.00" and following three lines are probably being produced by the BIOS ROM on your video card.
 
I bet you wouldn't believe what was creating the problems I was having with this machine. In all my machines that rebuilt, I have always incorporated a co-processor to help with the advanced math that the machine might encounter. I added a co-processor to this machine and low and behold the co-processor was keeping the machine from booting up. As soon as I pulled the chip, the system came up asking for the setup disk, etc. I guess the chip must have been defective.
 
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