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RCT-AXPERT 3K Burned circuit board


woodenmonster
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Hi Guy's

I've been having some issues with my inverter over the last year.  The inverter would drop down to about 25v over an hour and then suddenly it drops to 21v and the inverter switches off when the power comes back on it charges for about 15min and then it stops charging.  After the last load shedding my inverter shows that it is charging but the battery voltage keeps on dropping checked it with a mustimeter and there is no charge from the inverter.

 

I opened it up and found that the circuit board was burned, is it worth fixing I can't see any other burned components.

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1964973215_WhatsAppImage2021-02-16at10_55_10.thumb.jpeg.f418e2c62fafddfcd43860708decef96.jpeg

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2 hours ago, woodenmonster said:

I opened it up and found that the circuit board was burned, is it worth fixing I can't see any other burned components.

It doesn't look too bad, in that there isn't any charred fibreglass that I can see. Any charring has to be completely removed, because it can be conductive.

That said, you seem to have a complete track vaporised. That one would seem to be easy enough to replace with thick copper wire. Sometimes it might not be obvious where the track was supposed to be.

I note that the dead component appears to be a diode bridge, and there are no diode bridges in the 5 kVA models that there are more service manuals for. You might find a service manual for your model, perhaps even on this forum; check the files/download section. Even though you haven't spotted any other obvious failed components, an overload sufficient to vaporise a track probably took some other components with it.

Good luck! 🤞

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11 hours ago, woodenmonster said:

found another two blown components.

is this an easy fix ?

Tricky. Especially since your model doesn't seem to have component designators on the bottom of the board (e.g. Q100 for transistor number 100). I can't find any part under my 5 kVA spare board that looks anything like your top photo. So it will be a challenge to find out what the burned component is supposed to be.

With the capacitor on the top of the board, it looks like it might be similar to several 1 nF capacitors that the spare board has. Check for similar sized components nearby; if they have 103X on them (where X is unknown, I can't quite see, it's probably just a tolerance letter), it's likely a high voltage ceramic capacitor with the same value and specifications as others nearby. It might be an EMI capacitor, connecting something lethal to ground, in which case it has to be a Y rated safety capacitor. Note carefully any markings on its siblings.

11 hours ago, woodenmonster said:

that is all I can visually that has blown.

Of course, that may not be all that is actually blown.

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