Brutkey

zl2tod
@zl2tod@mastodon.online

@KrajciTom@universeodon.com

...
I'd guess they are 222Ω and 182Ω but I'm not entirely confident of that. If they are just ballast resistors for the LEDs you can ignore them, unless the charger is using one or more of the LEDs as voltage references.

TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️
@KrajciTom@universeodon.com

@zl2tod@mastodon.online

I don't have a schematic, and I'm not good at analyzing circuits, but my hunch is that the two LED's are merely indicator lights (charging, and charged).

zl2tod
@zl2tod@mastodon.online

@KrajciTom@universeodon.com

Can you photograph the back of the board, and transcribe the part numbers on the transistors?

TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️
@KrajciTom@universeodon.com

@zl2tod@mastodon.online

SCR1 = TYN225

SCR1 = TYN225

Q1 = C9012 G 916

Q2 = 2N4401

Q3 = 2N4401

Q4 = C9012 G 916

VR1 = 93AFLL9 TL431C TI

The Green LED signifies "ON"

The red LED signifies "charged"

Circuit board is fed by a center tapped transformer. The center tap is also ground, which is connected to the green wire ground of the 120VAC wall plug.

R7 looks like it may have been running even hotter than R10.

Thank you for this!