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Electrical relays and their faults - 11/24/2008 11:20:01 AM

Aneirin

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From: Tamaris
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Reading the forum ''ask a switch '' made me remember this question, the titles of the threads made me think ' logic state flip flops and their problems, the indeterminate value', then I remembered my relay. I have a problem with an electrical relay, if there is anyone here that remembers those things ?

What it is, is it seems to have become weak in that it flutters between the contacts causing burning, the carbon builds up, the gap gets smaller and the fluttering starts with a vengeance. I have cleaned the contacts several times with paper dragged between the faces, which works for a few weeks until the problem occurs again. Now, my electronics theory is rusty, not that I was much good at it anyway, but am I right in thinking the problem is occuring because the energizing coil is weak, possibly due to age, or is it that the supply voltage is down, (must get a multimeter) ? Could I be right in thinking that the relay really needs replacing or is it likely the problem is elsewhere ?

The relay is in the slow start circuit of a colour tv, the tv being about ten years old and of a lesser make.

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RE: Electrical relays and their faults - 11/24/2008 12:03:22 PM

Sanity

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Replace the contacts. Sounds like a holding circuit with a bad connection, and from your description the most likely culprit would be those defiled contacts. Electrical contacts are often gold or silver plated, and "cleaning" them can be ruinous.

Other than that, check your voltage and your other connections, and possibly your relay itself has developed an intermediate open (broken circuit).

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RE: Electrical relays and their faults - 11/24/2008 2:28:59 PM

DarkSteven

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Nope. Nothing to do with the coil or voltage. The problem you described is that the contacts simply corroded. You cleaned off the corrosion, but in the process removed some anticorrosive coating (which had become pretty useless anyway), so that the re-corroding process took less time than the original corrosion did.

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RE: Electrical relays and their faults - 11/24/2008 3:00:36 PM

Aneirin

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From: Tamaris
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Thank you very much , I will look further into it. Others might say junk the tv, but that isn't me, I will only junk it when I have totally stuffed it up, i.e., it no longer works for a major expensive reason.

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Everything we are is the result of what we have thought, the mind is everything, what we think, we become - Guatama Buddha

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RE: Electrical relays and their faults - 11/24/2008 4:23:09 PM

Termyn8or

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Relays in TVs are pretty much standard, might cost about six bucks. I would just replace it.

In fact if you send detailed photos I can probably just send you one.

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