ABit AB-AN4 1.0 repair - missing caps

ABit AB-AN4 1.0 repair - missing caps - help needed

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First post, by vutt

Posted on 2023-10-02, 16:44

vutt Offline

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Acquired recently slightly damaged ABit AB-AN4 1.0

One of the simm sockets was damaged and 2 caps are missing (pic attached) TC13 and TC14
MB uses a lot of similarly sized caps with same value (on 2nd pic ) - looks like 10uf 16v ?

Anyone have ABit AB* family MB? It looks like Abit had may boards with similar design.
Strangely enough MB seems to be working. I was able to boot up and run number of benchmarks over 1h or so yesterday.

Reply 1 of 4, by majestyk

Posted on 2023-10-02, 17:17

majestyk Offline

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The removed TC13 and TC14 seem to belong to the battery charging circuitry. They might be 10µF, but more likely 1µF or 4.7µF.

Reply 2 of 4, by vutt

Posted on 2023-10-02, 17:38

vutt Offline

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So I might not even need those caps, because I was thinking to utilize ext battery pins.
Btw I measured removed battery contacts voltage while MB was turned on, got 4.9V so charging circuity is still working despite missing caps.

Reply 3 of 4, by vutt

Posted on 2023-10-02, 19:00

vutt Offline

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Location: Estonia

So I'm getting 0.005mA power consumption on ext battery pins while MB is off. Is this normal figure?

amps.jpg

BIOS seems to be able retain changes. Still I'm slightly wary since 2 power circuit caps are missing.

Reply 4 of 4, by _Leo_

Posted on 2024-02-09, 15:42

_Leo_ Offline

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I (Lord Quake) have this board. The cap in the red triangle is a Tantalum capacitor, 10 µF/16 V.

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