Identifying a component on a PCB

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Old 12-09-2024, 12:22 PM
ltcdfancher ltcdfancher is offline
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Default Identifying a component on a PCB

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!
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Old 12-09-2024, 01:01 PM
gorillarick gorillarick is offline
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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?

Last edited by gorillarick; 12-09-2024 at 01:02 PM. Reason: add burnt
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Old 12-09-2024, 01:51 PM
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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.

Last edited by Pinball wizard; 12-09-2024 at 01:53 PM. Reason: added info
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Old 12-09-2024, 03:47 PM
ltcdfancher ltcdfancher is offline
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Quote:
Originally Posted by Pinball wizard View Post
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.
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Old 12-09-2024, 04:00 PM
Altavia Altavia is offline
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Unusual for a resistor to fail, could be something else failed first.

Good luck!
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Old 12-09-2024, 05:12 PM
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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.
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Old 12-09-2024, 07:24 PM
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Quote:
Originally Posted by Altavia View Post
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..
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Old 12-09-2024, 08:02 PM
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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.
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Old 12-10-2024, 06:48 AM
ltcdfancher ltcdfancher is offline
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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.
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Old 12-10-2024, 07:19 AM
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Quote:
Originally Posted by villagetinker View Post
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.
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Old 12-10-2024, 07:25 AM
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Quote:
Originally Posted by ltcdfancher View Post
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.
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Old 12-10-2024, 07:45 AM
lpkruege1 lpkruege1 is offline
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Default Transistor if I had to guess

Quote:
Originally Posted by ltcdfancher View Post
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.
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Old 12-10-2024, 08:07 AM
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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.
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Old 12-10-2024, 08:48 AM
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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.
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Old 12-10-2024, 01:27 PM
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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

Last edited by dougawhite; 12-10-2024 at 01:34 PM.
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