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Repairing a 486 DX

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Reply 60 of 63, by IBMPCATFAN1984

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appiah4 wrote on 2024-10-14, 06:03:

Not sure if this was mentioned earlier but that board has a TH1287 realtime clock chip which I would assume is a Dallas DS1287 clone. Regardless, it is probably flat, and I've seen many 486 boards not POST at all without a working one. So replacing that might be a first order of business here.

Sounds like a good idea, some companies still make replacements for the Ds-1287!
It would be a great opportunity to find someone who knows how to solder, to teach me how to solder (i learn better by doing and learning person to person)

Buut… i have to wait for my father to come home from a work trip before i do anything.

Reply 61 of 63, by IBMPCATFAN1984

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appiah4 wrote on 2024-10-14, 06:03:

Not sure if this was mentioned earlier but that board has a TH1287 realtime clock chip which I would assume is a Dallas DS1287 clone. Regardless, it is probably flat, and I've seen many 486 boards not POST at all without a working one. So replacing that might be a first order of business here.

Sounds like a good idea, some companies still make replacements for the Ds-1287!
It would be a great opportunity to find someone who knows how to solder, to teach me how to solder (i learn better by doing and learning person to person)

Buut… i have to wait for my father to come home from a work trip before i do anything.

Reply 62 of 63, by myne

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Search for YouTube vids on them.

The plastic casing can be removed easiest with heat. It crumbles.

https://m.youtube.com/watch?v=ecTZtZhE9bI&pp= … GFzIFJ0YyBoZWF0

From there, it is relatively straightforward.

Soldering isn't strictly necessary. Twisting wires isn't ideal, but it works at least to test.

It's in a hell of an awkward spot though.
For removal, your best bet is low melt solder and connecting all the pins on the back with a fairly thick wire bent into a u shape.

https://m.youtube.com/watch?v=kYpyH89v14c&pp= … vciBzb2xkZXI%3D

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Reply 63 of 63, by IBMPCATFAN1984

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myne wrote on 2024-10-15, 05:38:
Search for YouTube vids on them. […]
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Search for YouTube vids on them.

The plastic casing can be removed easiest with heat. It crumbles.

https://m.youtube.com/watch?v=ecTZtZhE9bI&pp= … GFzIFJ0YyBoZWF0

From there, it is relatively straightforward.

Soldering isn't strictly necessary. Twisting wires isn't ideal, but it works at least to test.

It's in a hell of an awkward spot though.
For removal, your best bet is low melt solder and connecting all the pins on the back with a fairly thick wire bent into a u shape.

https://m.youtube.com/watch?v=kYpyH89v14c&pp= … vciBzb2xkZXI%3D

I personally do not own a soldering gun, but, i will attempt to aquire one!

The chip is soldered onto the board though, i tugged a couple of times.
I found a replacement chip, but it is out of stock right now https://www.wiltronics.com.au/product/3816/da … eal-time-clock/