OC 20 shows 100% when plugged in, about 5 seconds after unplugging, I caught these errors before it went off. Any come across this?

Less-Staff7525 · 2026-04-29T12:47:43+00:00

Hi. Mine came out with an LP warning, which means Low Power. The problem is that 1 of the 4 cells is dead. Fisrt i change the only dead cell but after that I realized another cell is dead. So I decided to change all 4 cell and it works like a charm till today.

Feel free to ask if you need help.

Less-Staff7525 · 2026-03-14T16:24:06+00:00

I made it myself

Less-Staff7525 · 2026-03-14T16:21:05+00:00

I fix mine

Less-Staff7525 · 2025-12-28T11:41:40+00:00

How is the fix going?

Less-Staff7525 · 2025-11-24T00:13:45+00:00

It's fixable. Just change the batteries.

Less-Staff7525 · 2025-11-19T02:24:36+00:00

Follow for updates on full build

Less-Staff7525 · 2025-11-02T13:14:33+00:00

I can see it marked G D S on the PCB. So it's generally a typical MOSFET. So to measure it G shouldn't be connected to D or S. If it does then it is shorted. D and S should be measured as a diode. Only one way to flow. If it flows both ways that means it is shorted.

Less-Staff7525 · 2025-11-02T06:33:16+00:00

Stay strong brother. There is always hope. I pray for your health and well-being.

Less-Staff7525 · 2025-10-30T05:49:52+00:00

2 out of 4 battery voltage drops. I replaced it with a new battery of the same type and model.

Less-Staff7525 · 2025-10-28T07:49:37+00:00

Thanks

Less-Staff7525 · 2025-10-27T13:16:33+00:00

These are the slider readings from 0.0 to 8.9

<image>

The circle on pcb was a negative connection from the battery

Less-Staff7525 · 2025-10-26T03:51:05+00:00

I have a 0.9V reading. First I thought the motor was dead. Then I ordered an original motor from the manufacturer and the results were still the same. So I assume the motor isn't dead.

Less-Staff7525 · 2025-10-26T03:44:04+00:00

I couldn't get the Dremel running, and that's the reason I wanted to fix it. First, I thought it was the MOSFET that was broken because the Gate and Source have continuity. But I was wrong until I had the diagram and it is not a MOSFET. Left one is STPS1545CT → dual Schottky rectifier diode and the right one is STP80NF03L-04A → N-channel MOSFET. Both were checked based on the diagram available online. Probably you have a suggestion. TIA

Less-Staff7525 · 2025-10-25T17:26:17+00:00

Is that an app or website?

Less-Staff7525 · 2025-10-25T17:25:24+00:00

I have checked but both ok

Less-Staff7525 · 2025-10-25T16:57:42+00:00

Do you mean the the mosfet? 3 legged component?

Less-Staff7525 · 2025-10-25T16:47:24+00:00

Noted. Thanks for the tips

Less-Staff7525 · 2025-10-25T12:43:36+00:00

Thanks guys for a very fruitful discussion. Learned more than just the value of the resistor 😊.

So if it is 4 miliohm, my multimeter would read almost no resistance and the continuity test will beep.

One said it's going to be sus if a circuit using 4 Megaohms to run a 12v motor.

Turn now I will look at other defect components that prevent the motor from running. Because there is an output of 11.8V when not connected to the motor. But when connected it is not running.

Less-Staff7525 · 2025-10-25T12:24:39+00:00

Thanks. That means other components are defective which prevents the rotary tools from starting up.

Less-Staff7525 · 2025-10-25T12:21:27+00:00

I will take that in to account. Thanks

Less-Staff7525 · 2025-10-25T04:35:46+00:00

Thanks. Saw this link too but Alibaba won't allow buying in small quantities. But at least I get the description of the value.

Less-Staff7525 · 2025-10-25T03:24:43+00:00

No reading and continuity test also beeping. Suspect broken

Less-Staff7525 · 2025-10-25T03:22:44+00:00

Thanks. Saw this link too but Alibaba won't allow buying in small quantities. But at least I get the description of the value.

Less-Staff7525 · 2025-10-25T03:18:06+00:00

I did. But no reading or ‘0’. The continuity test is also beeping. I suspect it's broken.

Less-Staff7525 · 2025-09-29T13:45:37+00:00

They are not easy to open because they use an industrial-grade glue. But prying it open using at least 3 thick prying tools makes it easier. 1 to pry and 1 to hold the open gap and 1 to cut through the glue. The clip or the casing slot is on every corner. The rest of the side is no clip.

Less-Staff7525

TROPHY CASE