Nail dryer stoped working and I can't find the issue

theboredunicorn · Dec 12, 2020

Hello,
I have a Sunone UVLED nail lamp. For some reason, it stopped working yesterday. None of the lamps are glowing when turned on and because of that, I think that the fault is from the driver(uploaded pictures).
Here is how's it supposed to work: I plug in the connector to the dryer, then I hold button one(led 1), select for how many seconds I want it to work, put my hand inside the dryer(there is an IR receiver and emitter) and it starts working. I tried connecting the two ends of the IR's and start it again, but that didn't work as well. I have no idea what might be wrong with it and how to fix it. Can somebody help?

M.Joshi · Dec 12, 2020

How good are your electronics skills and do you have a multimeter?

M.Joshi · Dec 12, 2020

Posted here too:

theboredunicorn · Dec 13, 2020

I do have a multimeter and my electronics skills are very very very low.

theboredunicorn · Dec 13, 2020

The glass of the LED4 is broken, but when I turn on the lamp and press button 4 it lights up(LED4) but the UV LEDs do not work.

M.Joshi · Dec 13, 2020

Q1 looks to be the transistor that drives your array of UV LEDs. Can you read a part number off it?

Also, what is the DC voltage across the LED + and - terminals (top right of the PCB) when you set your normal On time?

theboredunicorn · Dec 13, 2020

It's: NIKOS P5506BDC BNA7N021B
The DC voltage is 10.38V

M.Joshi · Dec 13, 2020

With the negative probe fixed on the - terminal, can you touch the positive proble to each LED and read the voltage. One side of the LED will read a higher voltage than the other. It would be useful if you can indicate these on a diagram or annotated photo.

Les Jones · Dec 13, 2020

It looks like there may be a crack around the soldered joint where the red wire that goes the the LED panel is soldered to the control board. Check that you still measure 10.38 volts between the red and black wire where they connect to the LED panel.

Les.

theboredunicorn · Dec 13, 2020

Les Jones said:
It looks like there may be a crack around the soldered joint where the red wire that goes the the LED panel is soldered to the control board. Check that you still measure 10.38 volts between the red and black wire where they connect to the LED panel.

Les.

I tried searching for a crack but I didn't find one. Also, I'm using this forum more . All of M.Joshi's questions are answered there and there are additional photos as well.

M.Joshi · Dec 15, 2020

What is the voltage across the output terminals with the LED arrays removed?

Also, did you get a chance to try this?

M.Joshi said:
With the negative probe fixed on the - terminal, can you touch the positive proble to each LED and read the voltage. One side of the LED will read a higher voltage than the other. It would be useful if you can indicate these on a diagram or annotated photo.

Nail dryer stoped working and I can't find the issue

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