Odd RTC behaviour on AUVA 286 motherboard \ VOGONS

Odd RTC behaviour on AUVA 286 motherboard

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First post, by HanJammer

Posted on 2019-05-04, 00:01

HanJammer Offline

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Few months ago I bought this AUVA 286 (BAM/16) motherboard. I had extensive battery leak dammage, but it was in running condition. I neutralized the leak and fixed the dammaged traces. Motherboard runs fine, but RTC is like three times too fast (it counts 3-4 second every second). I don't see any dammage around RTC chip.

https://youtu.be/KPGeonVL-PI

What can cause such behaviour? Dammaged RTC chip?

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Reply 1 of 2, by rasz_pl

Posted on 2019-05-04, 00:45

rasz_pl Offline

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is c13 cracked? you might need to resolder/replace y5 "watch" crystal
still plenty of green corrosion on the legs of components

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Reply 2 of 2, by HanJammer

Posted on 2019-05-04, 01:34

HanJammer Offline

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Posts: 1303
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rasz_pl wrote:
is c13 cracked? you might need to resolder/replace y5 "watch" crystal
still plenty of green corrosion on the legs of components

Yeah, it seems so - C13 is cracked. I havn't noticed it before… I will replace it. Also the cap next to this one literally turned into dust when I touched it.

Y5 sits tight on it's spot, so unless it's internally dammaged I will leave it alone (I doubt there is a connection problem I will verify it later).

Yeah I may try cleaning this board a little more...

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