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Compaq Portable III PSU trouble

Forums > Vintage IBM Compatible PC's > 80286 / 80386

luminescentsimian
Tinkerer
Tucson, AZ
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Joined: Nov 4, 2021
Posts: 126
Likes: 99
Jun 2, 2023 - #1
I replaced most of the caps in the in the PSU but it was still making an odd high-pitched noise before resetting. Ruh-roh, maybe there's a problem with one of ICs died. A little looking around I spotted a thin line in one of the vertical boards.

Thar's your problem:


I'm thinking the odds of finding a replacement of these is pretty slim so I' guess I'll be trying an ATX4VC and figuring out what the display needs for power.
Attachments:
PXL_20230602_072114121.jpg [View]

joeventura
New Tinkerer
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Joined: Aug 27, 2024
Posts: 16
Likes: 9
Sep 6, 2024 - #2
Two sided board? A little crazy glue and a soldering iron

Liked by wottle

Stinkerton18
Moderator
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Joined: Aug 18, 2022
Posts: 97
Likes: 73
Sep 18, 2024 - #3
Maybe it's just me but...those ICs look "oily", like they've been treated to some unusually high heat. Was there some sort of thermal pad on them before hand?

Aside from that I agree that it looks like the traces are decently large enough they could be repaired with some small gauge jumper wires.

i80386sx
New Tinkerer
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Joined: Dec 7, 2024
Posts: 2
Likes: 0
Jul 21, 2025 - #4
I hate those orange tantalum's with a passion.

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