Lanzar Opti 2000D

[Formas]

What would have caused the output cap (polarized) 80v 2200uf (other than over voltage) to explode on the Lanzar Opti 2000D?
Haven’t checked it thoroughly yet but from the in-chassis view the output inductors looks fine.

 

[Perry Babin]

Are you sure that it vented? The top doesn't look deformed and I don't see any electrolyte or corrosion.

That's likely a rail cap.

 

[Formas]

It’s vented, I’m not sure if it’s a rail cap I haven’t pull the board from the chassis as yet to confirm.

 

[Perry Babin]

Post a photo of the entire board.

 

[Formas]

This is the full board, my last repair on this amp was few months ago it had leaky caps where I changed all that group of five rail caps (80v 2200uf)

 

[nigelwright7557]

Maybe just old age.
Did you change the output capacitor ?

 

[Perry Babin]

There are 3 positive and 3 negative rail caps. Typically, all 3 negative caps are near the transformer. For the positive rail, 2 are in that area and the other is in the blown location.

If only that one failed, it may have simply failed due to age. I'm assuming that the vias are intact for the ones you replaced so the blown one wasn't pulling the entire load.

I'd suggest that you carefully look for broken solder connections on the large transistors on the driver board.

 

[Formas]

I’ll replace the blown cap and checked the driver board tomorrow, will keep you posted. The caps I changed was over two months I don’t think I damage any vias during that process as I had checked for continuity on top layer and bottom layer of the rail circuit trace.
@nigelwright7557 I’ll remove the cap covering and inspect the output caps and test them also with my esr meter.