Mini lathe electronics issue

Some suggestions...

First, do you have a voltmeter?

Can you use it?

What do you mean by hot wire?

What was done to do this?

It looks like there are some LED on the board, does not look like anything is blown up.

So we start checking things.

You need to observe and measure.

If you turn on with cover open and flip switch or turn knob, does anything happen?

If led light up then check voltage at motor connection.

If not...

Check voltage on the line cord where it attaches.

Then check voltage at fuse, switch an so on.

If you had an overload it could have smoked something or caused a bad connection to open up.

Or a trace could have opened up.



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Be careful testing live circuits- best, safest method is to use clip leads with your meter:
1) Turn off power. Attach one meter lead to incoming neutral (white) line wire
2) Attach other clip lead to point you want to measure- set meter to proper scale (ac volts)
3) Turn on power and take measurement
4) Turn off power, remove clip leads
Repeat as necessary

If you determine that power is reaching the board, the next thing would be to
remove the board and inspect it for burned areas top and bottom- if you are lucky the fault might be visible
 
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If the board is shot, these controllers make great replacements.
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KB Electronics KBIC-120 DC Motor Speed Control 24822094290 | eBay

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Be sure to buy the right wattage resistor, like this
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KB/KBIC DC Motor Control Plug-In Horsepower Resistor #9834, .51 Ohms. | eBay

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Get in there with a magnifying glass and check each component. Look for burns or otherwise damaged bits.

Very often, EE’s will add (what I call) a fuse diode in a circuit. Its a diode that pops if theres a reverse curent or over current scenario. Its meant to protect the rest of the electronics downstream.

They’re easy to replace with a simple soldering iron.

Any other components that might look overheated, melted or burnt are also probable causes…
 
Check the switch attached to the speed control pot. Check the pot as well. All with the power cord unplugged.
 
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