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Hi again, I have updated the pictures folder with some close ups of what I can read: https://bit.ly/2zyEtXj

I'm knowledgeable enough to identify if some component is part of a PWM module or not. ...

Any suggestions, please?

I have added some close up pictures here: https://bit.ly/2zyEtXj

Also, I'm attaching a schematic of the lathes wiring (sorry about the drawing, I'm not an electronics guy).

I will both try to identify the power output device and take detailed pictures to post here.

Preferably I would like to avoid modifying the board and just add something in series with the motor...

Yes, you're right. Yesderday when I got home from work I tried to connect those wires to another PWM module and that checked out, it is only for the readout (of course, the "in" and "out" are...

It was always there from new.

It's a 750W motor with brushes which has a 220V sticker on it. I believe it is a DC motor, It only has 2 wires running from it.

Here's a link for a video (in reality the noise is much higher than...

I have a 16" x 8" mini lathe. It's one of those generic, gray, chinese mini-lathes, no brand name associated.

Amonst other deffects, which I can work out, there's an irritating whining noise (high...