[ltcdfancher]

I’m hoping to enlist the expertise of someone on this forum to identify the burnt component. The pictured PCB is inside a canless LED fixture marketed by Torchstar. The light is a 6”, 18W LED. The burnt component appears to be a large wattage resistor, but I do not know the specifications. Any help would be hugely appreciated!

[gorillarick]

With only a top view, it would be a guess. Looks like a capacitor. Notice all the little round cans in the pic with aluminum looking round tops. These are all capacitors.

Posting a close-up side view would help.

So if it is a capacitor, then you'd have to read the rating. That looks tough, like figuring out what kinda bread the burnt toast was made from?

[Pinball wizard]

Sometimes when you remove a component, the model/rating of the component is etched on the PCB.

Another thought is if you have another one, look at the rating on that one.

[ltcdfancher]

Originally Posted by Pinball wizard

Sometimes when you remove a component, the model/rating of the component is etched on the PCB.

Another thought is if you have another one, look at the rating on that one.

Mr. Wizard, your idea was spot-on. I dug into the first one of these to fail and found a resistor that was not as badly damaged. I think I could even make out the color bands in the photo.

[Altavia]

Unusual for a resistor to fail, could be something else failed first.

Good luck!

[villagetinker]

OK, I have equipment to measure the resistance, I would not trust the color codes as the colors may have changed with heating, and I MAY have suitable replacements in stock. Send me a PM if you want help, and we can discuss over the phone.

[npwalters]

Originally Posted by Altavia

Unusual for a resistor to fail, could be something else failed first.

Good luck!

Having worked as an electronics tech in the Air Force for several years, I agree that when a resistor fails it is almost always due to something else failing first..

[villagetinker]

Originally Posted by npwalters

Having worked as an electronics tech in the Air Force for several years, I agree that when a resistor fails it is almost always due to something else failing first..

I agree with this comment, and while I am willing to help, I think complete replacement would be a wiser choice.

[ltcdfancher]

Thank you to everyone that offered advice. A new fixture by the same manufacturer similar to the original is less than $10. I think that I’ll be better off chunking these two into the trash and not tempt fate.

[crash]

Originally Posted by villagetinker

I agree with this comment, and while I am willing to help, I think complete replacement would be a wiser choice.

I agree with this. The fact that 2 different fixtures failed definitely says another problem then just a bad resister. How much can a 18 inch led cost.

[Maker]

Originally Posted by ltcdfancher

Thank you to everyone that offered advice. A new fixture by the same manufacturer similar to the original is less than $10. I think that I’ll be better off chunking these two into the trash and not tempt fate.

Multiple failure of the same item? Lousy history means= never buy another one. I'd find some other manufacturer.

[lpkruege1]

Originally Posted by ltcdfancher

I’m hoping to enlist the expertise of someone on this forum to identify the burnt component. The pictured PCB is inside a canless LED fixture marketed by Torchstar. The light is a 6”, 18W LED. The burnt component appears to be a large wattage resistor, but I do not know the specifications. Any help would be hugely appreciated!

It looks like a transistor but without a schematic or a similar board to get the part number off of, It's junk.

[JimC55]

It appears to be a 1 ohm resistor with a 1 percent tolerance. Likely failed over time due to heat dissipation. My last job was VP of technology for a broadcast group. I would bet they will all fail in a similar way. Good luck.

[Shadowrider]

That is most likely a Zero ohm fusable resistor. A zero ohm resistor will have a black band in the center. The wattage rating is determined by the other bands. I am a engineer and have been designing and repairing electronic circuits for 40 years. There could be many causes for its failure, but, it is there to prevent fires from an overloaded condition.

[dougawhite]

Fusible resistor. Many such products designed for minimal cost will use a fusible resistor in such a position rather than a proper fuse. If it’s blown, it indeed is a likely indication that there are faults elsewhere. Replacement of the entire unit would be the expected and likely most economical fix.
Fusible Resistor : Construction, Working, Differences & Its Applications