Electronics > Repair

Venom Dual 2-10 Amp Lipo Charger?

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Technoman:
 Hey folks! This is my first post here and I don't know if any of your are familiar with Lipo chargers for Remote Control Helicopters but it shouldn't matter I don't suppose.

 The problem I'm having is this.... I plugged in a 4 cell Lipo battery to port 2 of my Venom Dual 2-10 Amp charger yesterday and I heard a tiny pop. Since then the charger gives a broken connection error message.

I've taken the case apart to look inside to see if there was something obviously wrong with the charger but found nothing.

 Where do I go from here?

There are some fairly large capacitors on each port and I wonder if the one on port 2 might have failed.
Or maybe I should look elsewhere?

I've fixed a few things on circuit boards long as someone can point me in the right direction or if there is something obviously burned out. I don't know a lot about tracking down an issue when none is apparent.

 Any help would be greatly appreciated.

Flump:
some good internal pictures of both sides of the circuit board would help :)

Technoman:
 Here are some pics. Let me know if another angle is needed. Thanks.

Technoman:
 Now both ports in the charger are dead. I plugged a battery in this evening and heard a tiny pop just like port 2 did and now I get a broken connection error message on port 1 as well.

I think I may have some blown mosfets. I took the heat sink off this evening and I can see two areas of the board that have gotten pretty hot. There in the same place on each port. Each spot has a cluster of 4 MOSFETS.

Can I test those in the board? I'm getting a reading on some of them after opening the gate but not all of them. I can't get my pics to load now. I'll try again later. 

 If you look at the 2nd pic on the back of the board there are 2 dark areas. The mosfets are on the other side of the board in those dark areas.

Technoman:
 Here are the pics with the heat sink off. You can see the two dark areas surrounding the Mosfets.
Both sides

Right Side

Left side

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