Sad Socket 4 motherboard \ VOGONS

Sad Socket 4 motherboard

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First post, by Per

Posted on 2020-12-27, 15:21

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In hinsight, I should have removed that battery years ago. On the other hand after a vinegar wash, solder mask held up allright, damages doesn't seem too bad, and looks quite fixable if I can get hold of the resistance values of the missing resistors.

If anyone has a similar board, I would be really happy if you could check up the resistor-values of R40-R46 for me.

A bit more info on the board, it's from an AT&T first generation Pentium (60MHz) machine, and seems like the board is named "PB5500C". It has an OPTi "Premium" 82C596/597 chipset.

Reply 1 of 9, by PD2JK

Posted on 2020-12-27, 15:40

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Are the contacts of those missing resistors 'too clean'? Could be that those weren't soldered in the first place.

Nice board, socket 4 boards are quite rare.

i386 16 ⇒ i486 DX4 100 ⇒ Pentium MMX 200 ⇒ Athlon Orion 700 | TB 1000 ⇒ AthlonXP 1700+ ⇒ Opteron 165 ⇒ Dual Opteron 856

Reply 2 of 9, by Per

Posted on 2020-12-27, 15:51

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They were there, but the tin was crumbling. Really brittle stuff after corrosion. I didn't realize they were coming off untill most of them were gone.

Reply 3 of 9, by evasive

Posted on 2020-12-27, 16:43

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Can you post whatever comes after 411-6??4-????-???? please? I think this is a MiTAC board but it's possible it was never sold as retail, only inside a Compaq/HP machine possibly. For that I'd need the 411 <something> number.

Reply 4 of 9, by Per

Posted on 2020-12-27, 17:26

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it's just 411-6894-[]R[]. Nothing is written into the filled areas. The sticker in the middle says 17- 28746627.

Edit, back side PCB trace layer says 316-6894-00001 R01. Made in 46th week of 1994.

Reply 5 of 9, by Per

Posted on 2020-12-27, 21:27

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Update, found a few of the resistors in the waterlock of the sink. there's at least one 103 (10k), two 102 (1k) and one 330.

Reply 6 of 9, by PD2JK

Posted on 2020-12-27, 21:30

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Did you rinse it? 😁

i386 16 ⇒ i486 DX4 100 ⇒ Pentium MMX 200 ⇒ Athlon Orion 700 | TB 1000 ⇒ AthlonXP 1700+ ⇒ Opteron 165 ⇒ Dual Opteron 856

Reply 7 of 9, by Per

Posted on 2020-12-27, 21:39

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Well, there was thick white battery goop all over the place between those two ISA slots. First priority was to get that nastiness off.

Reply 8 of 9, by quicknick

Posted on 2020-12-27, 23:42

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Strange to see such damage so remote from the battery. Should be much worse near it. Or maybe something else was spilled between those ISA slots...

Reply 9 of 9, by Per

Posted on 2020-12-28, 00:31

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quicknick wrote on 2020-12-27, 23:42:

Strange to see such damage so remote from the battery. Should be much worse near it. Or maybe something else was spilled between those ISA slots...

It was an external 3.6v litium battery which was stored still connected, laying on top of the motherboard. I was not aware external batteries like that could leak through the plastic enclosure at the time it was put into storage.

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