Replacing dead TH1287 clock chip \ VOGONS

Replacing dead TH1287 clock chip

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First post, by chickenvog

chickenvog Offline

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I have a 486 laptop with a dead clock chip, which is messing with my hard drive and video settings. I ordered a DS12887 RTC Drop-In Replacement from https://monotech.fwscart.com/product/ds12887- … -in-replacement but I'm not sure if this will work with my board, I assume it does because it seems to be a clone of the DS12887 but if it doesn't then I'm fucked.. has anyone here ever done the same thing as me? If so, did it work?

Reply 1 of 2, by jmarsh

Posted on Today, 01:53

jmarsh Offline

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Is it socketed or soldered to the board?
Some of the DS1287 clone chips didn't do the epoxy trick and you can just pop the top off and replace the dead battery with a new one.

Reply 2 of 2, by mdog69

Posted on Today, 06:54

mdog69 Offline

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Joined: 2019-02-09, 10:42
Location: Coventry, UK

My personal rule is to Dremel "in place" any device soldered to the PCB. I'll also Dremel any 48T02.

Reasons:
I'm less likely to cause damage using a Dremel compared to desoldering. For the 48T02 (not relevant here) it's because early devices have undocumented features which preclude replacement with later devices (even when the data sheets say they should work).

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