Author Topic: Need help identifying inductor  (Read 211 times)

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Offline MondoTV

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Need help identifying inductor
« on: May 20, 2020, 01:20:10 pm »
Hi all - I have Benq GL2450B that starts to emit a strong burning smell when turned on. Because it’s burning. Remakably it still works. I opened it up and found a couple of bad caps feeding an inductor. Replaced them but the inductor appears to be bad (probably destroyed the caps)  Unfortunately I can’t identify as it has no markings and the  and I just have basic electronic skills. It’s part of a DC supply circuit. Although I found circuit diags online they don’t match up with the actual board. Picture attached - you can see the burnt area on the board around the inductor.

Sorry forgot to add does have TC1227 on label
« Last Edit: May 20, 2020, 01:45:38 pm by MondoTV »
 

Offline madires

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Re: Need help identifying inductor
« Reply #1 on: May 20, 2020, 02:21:16 pm »
That inductor seems to be part of an LC output filter. Typical values are roughly around 10µH, but the exact value isn't critical. The maximum current is more important. Measure the diameter of the inductor's enamel wire with a caliper to figure out the current rating. Presumably the inductor got hot because of the bad filter caps, e.g. high current draw. And even with the toasty appearance it could be still fine. If the monitor runs great with the new caps simply keep the inductor.
 

Offline MondoTV

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Re: Need help identifying inductor
« Reply #2 on: May 21, 2020, 03:42:50 am »
Thanks Madires. No the circuit board is still overheating. Iremoved the inductor and it measures .05mH and about 0.1 - 0.2Ohm resistance. Hard to know if that’s bad or something in the control circuit. Pic of tester attached
 

Offline madires

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Re: Need help identifying inductor
« Reply #3 on: May 21, 2020, 10:25:25 am »
Is the inductor still overheating? Have you checked the voltage of that rail? Maybe there''s something drawing more current than it should. But I've also seen inductors with a too low current rating to save a few cents, and they run hot of course.
 


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