Ego 56v Battery Charger Failure

[!sense]

My neighbor recently brought me an Ego 56V Battery Charger due to my reputation of tinkering with everything, asking if it could be repaired.

I'm trying my hand at this, with limited knowledge and the best intentions, a tried and tested recipe for disaster .
I've always had an interest in electronics and I'm quite keen to learn but do not have the fundamental knowledge which I think most people in this forum possess.

The unit allegedly died with two successive loud bangs. This leads me to believe that one component failed catastrophically which cascaded into a second failure.

I included some pictures. I have already removed some components from the board either for testing purposes or because they are visibly damaged.

I got a fair amount of information from this thread: https://www.badcaps.net/forum/showth...attery+charger

It seems that this unit suffered a little more damage.

The blue catalytic capacitor exploded just like in the referred thread. I was able to get a good picture of the value it seems to be 330 pF (C30). My intent is to replace this with a 2kv version.

The large blue resistor is 0.18 ohms (R52 on the board). I'm not sure if the wattage I'm thinking of going with 2W

Another .25W resistor burnt up so as to be unrecognizable (R58), leaving scorch marks on the board. Any suggestions for an appropriate value would be appreciated.

I was able to get some markings from U9 and agree that it seems to say 28600D.

In my attempts to test the transistor I had to remove it from the board and noticed that it was cracked as well. It is a 18N65 manufactured by Alpha Omega with a continuous drain of 18 amps. It seems to have been discontinued and the best I can find right now is a component with a continuous drain of 15 amps. I am tempted to replace this with https://www.digikey.com/en/products/...65S3HF/9829149 which is probably way overkill but does not make a huge price impact from a repair perspective.

There might be more unseen damage, if anybody can point me to additional components to test or any other suggestions that would be great!

[R_J]

Re: Ego 56v Battery Charger Failure

The ic will be damaged, I cant see where R58 connects due to the red R59 but it is likely connected to CS pin3 a value would be between 0~3kΩ going by other schematics.
I also suspect other damage like zener diodes in the circuit.
R59 seems to be a 0.08Ω 1w resistor It looks bad but is it open?

Also replace C14 electrolytic capacitor

[!sense]

Re: Ego 56v Battery Charger Failure

Thank you R_J

Here is a clear picture of the board with nothing hidden behind text.

I don't quite follow on C14 - I see D14, a diode. I think that might be C3 - there is a CY4 printed near it which may look like C14. It is near the transformer?

The resistor R59 is not open but measures about 425kΩ - seems close enough to 'open'. I've rarely seen damaged resistors, they tend to survive most of the time.

I've probed the remains of the R58 pad and it does seem to go to pin3 - I have indicated this on one of the photos.

I also see one Zener diode on the SMD side, ZD3 in that vicinity. It's difficult to read the markings, but it might be 11M

[Israelx7]

Forgive the intrusion and being late to the party. But, I too have a belly up EGO charger. In fact it was in searching out for an obviously fried R 58 on my board that led me to this thread, on this site, of which I am now (obviously) a member. You guys are miles if not light years ahead of me re:all things electronic...but in meager beginnings to dip in a toe, I just have to ask...did you find R58 to be a 430 ohm 5% tolerance? You fellows have lost me at the other components that could be likewise affected, but since I find no obvious signs of damage except the slight scorch on the top of the board from R 58, I will proceed, once the replacement arrives, a repair. I suspect I hear chuckles..."this fellow thinks smoke is about the only indication of failure"...wait till he finds out! But anyway...did you ever get that charger up and running again?