Resistor Replacement Help! DeWalt 20V Charger

[ZaneC]

Hey y'all. My Dad's DeWalt charger just "popped", so I took it apart and found the problem. You can see the burnt resistor.
Could someone link me to one?
Also, does the color pattern tell you what type of resistor it is?
Thanks

 

[RustyUs]

Just type "color code for resistors" into search.

 

[WickedFog]

@RustyUs - so what resistor is it? How does this work?

 

[ferrebee88]

Looks to be 18.3ohms. Someone correct me if I'm wrong

 

[WickedFog]

Looks to be 18.3ohms. Someone correct me if I'm wrong

Oh. I was reading it from the wrong direction I think? You start with the black?

I'm completely lost

 

[ferrebee88]

I was wrong. The last band can't be black. It starts with the black. I think it's 0.43ohms

Just to confirm in case the picture looks a little different than reality: 1st band is black, 2nd is yellow, third is orange, 4th is silver, and 5th is brown right?

 

[WickedFog]

I was wrong. The last band can't be black. It starts with the black. I think it's 0.43ohms

Just to confirm in case the picture looks a little different than reality: 1st band is black, 2nd is yellow, third is orange, 4th is silver, and 5th is brown right?

That's the way I saw it.

But I wonder what caused the resistor to pop.

 

[ferrebee88]

That's the way I saw it.

But I wonder what caused the resistor to pop.

I'm sure there is more to it than just a popped resistor. Something led tonthe resistor popping. In my line of work Ibisially deal with resistors in the range of 2k to 47k, and I've never seen one pop.

 

[ZaneC]

I'm sure there is more to it than just a popped resistor. Something led tonthe resistor popping. In my line of work Ibisially deal with resistors in the range of 2k to 47k, and I've never seen one pop.

Dad plugged it into a 30 amp outlet. Oops.

 

[ZaneC]

I was wrong. The last band can't be black. It starts with the black. I think it's 0.43ohms

Just to confirm in case the picture looks a little different than reality: 1st band is black, 2nd is yellow, third is orange, 4th is silver, and 5th is brown right?

Correct.

 

[ferrebee88]

That will do it! Be very careful if you replace the resistor and plug it in. There may be damage elsewhere.

 

[ZaneC]

That will do it! Be very careful if you replace the resistor and plug it in. There may be damage elsewhere.

I will go double check on the colors, but I did find the .43 ohm resistors on Amazon.

 

[Tunedfrog]

I'll stick with popsicle stick and foam board.

 

[ZaneC]

Ok, yep. They're the ones. Thanks guys!

 

[WickedFog]

@ZaneC - are there any of these mounted in there?

If so, check that the screws holding them to the chassis are tight. One of these came loose in my printer and fried a capacitor. No idea if that could cause your issue, but look around for other problems.

 

[WickedFog]

Dad plugged it into a 30 amp outlet. Oops.

Oh, ok. Ignore my last reply then

 

[ferrebee88]

 

[Greywolf74]

• Resistance: 0.43Ω (430mΩ)
• Tolerance: ±1%
• Wattage: depends on size (see chart below)

Resistor Size (Length x Diameter in mm)	Estimated Wattage Rating

3.2mm x 1.6mm (⅛ inch)

¼ Watt (0.25W)

6.4mm x 2.3mm (¼ inch)

½ Watt (0.5W)

9.2mm x 3.2mm (⅜ inch)

1 Watt (1W)

11mm x 4mm (½ inch)

2 Watts (2W)

15mm x 5mm

3 Watts (3W)

20mm x 6.5mm

5 Watts (5W)