Re: Ego 56V battery charger dead

My last kick at the Ego Power+ CH2100 charger.

Borrowed a bad battery, a good battery, and a known good charger from the owner of the subject charger.

No joy.

Repaired charger is totally inert even with a good battery in position - Kil-O-Watt says it doesn't even change from 40 mA current draw from the line. My cargo-cult substitution of a mystery FET from a junkbox for the mystery Q16 FET that was shorted G-S worked about as well as cargo cult spells always work.

From the good charger I learned...

Re: Ego 56V battery charger dead



In case someone stumbles on this thread:

I got U9 (28600 chip) off the board, using copious amounts of flux, solder wick and Kapton tape (Louis Rossman would be proud of me). But replacing it will only be for practice.

I still had 0.5 ohms to ground from pad 5. I found Q16, a surface-mount transistor on the traces side of the board, is shorted gate-to-source (assuming this is a FET). I can't make out any markings on this device. I may salvage a similar-size FET from a junk P/S or LED lamp but unless...

Re: Ego 56V battery charger dead

My parts orders came in today. I have replaced the bad transistor, resistor and capacitor and this evening powered up the charger through a 40 watt light bulb in case of short-circuits. I have 300+ volts on the transistor, but no activity at all. I don't presently have a battery to try charging - will there be any activity on the LEDs at all when first powering up?

I suspect U9, as mentioned above, may be at fault also. If it's a UCC28600 as listed earlier in the thread, I imagine I shouldn't read 0.5 ohms from Pin 5 (output driving...

Re: Ego 56V battery charger dead

More on this old but useful thread.

I'm in the same boat. This thread has been very helpful. I'm hoping 470 pF at 2kV is good for C30 because that's what I've ordered based on this thread. Can't beat having a link directly to DigiKey's catalog for the resistor!

Ordinarily I'd be reluctant to tackle a switch-mode power supply but I had good luck earlier this year replacing a bad capacitor and blown transistor in a VCR (kids...ask your parents what a VCR was). Keeping my fingers crossed. The cost of parts is alarmingly...