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Voltcraft NPI2000-12 power inverter (after apply power constant beep) (rev polarity?)

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electronicnoobblog

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Hello,


I have Voltcraft NPI 2000-12 power inverter, i'v got it described as not working at all without any information about how it goes bad.

I suspect connecting to reverse polarity, because some of filtering capacitors are cooked.

After applying power from my bench PSU i can hear constant beep , no matter if switch is to OFF / ON / REMOTE.
No LED turn ON at front panel.

On power PCB i found exploded 3 capacitors C8 C7 C6 there are at input stage, looks like filtering 12V.

I removed them from circuit.

Fuses are OK, not blown.

Trace between C1 - C5 was melted (input stage, looks like power filtering caps) i fix that.

I checked all transistors at heatsink, i un-soldered them and make external test (every separated) one by one - everything looks good.

I checked D1 at begining.

Powered from 13V take around 0.01A to make this constant beep - nothing more.

Does anyone could help me ?

Here how it's looks like:

https://www.conrad.com/ce/en/produc...000-12-4000W-Inverter-Trapez?ref=searchDetail


Tomorrow i will try take pictures.

I have similar but 1000W, internal controller pcb look similar, maybe i could swap and make test but im not sure because it's quite expensive.


Regards
 

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