22 May 2024, 22:25 | #1 |
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1084 high pitched noise
My 1084 works, or at least it did the last time I tried it.
Problem is it has a very high pitched noise when it's on. I can barely hear it but I'm getting close to 60 and have tinnitus so my hearing isn't what it used to be. My ex did hear it clearly though and said it almost made her feel nauseous. I know little or nothing about old CRTs so just want to ask if anyone has an idea what's causing this. Caps getting bad or something else? |
22 May 2024, 23:01 | #2 | |
CaptainM68K-SPS France
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22 May 2024, 23:12 | #3 |
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23 May 2024, 09:23 | #4 |
CaptainM68K-SPS France
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23 May 2024, 10:18 | #5 | |
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Typically both at this age of life. When caps go out of spec, this can impact the loading and frequencies of coils and high-tension transformer. The transformers themselves can also fail for other reasons, age/time in duty being one. (breakdown of internal insulation and resin layers). You should not continue using the unit ~ such may incur further damage/failure. As stated these units can store enough electrical charge to kill a person in one zap. If you're not trained in the danger, "No User Serviceable Parts Inside" applies. A competent repair strategy that would be undertaken here, would be check/replace capacitors, then recheck test voltages & alignment. If the high tension transformer is the culprit (it continues 'ringing'), a replacement needs to be sourced and fitting, and the unit adjusted/checked again. Failure of these transformers is unfortunately common. |
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23 May 2024, 13:51 | #6 |
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30 May 2024, 22:05 | #7 |
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So, found someone who knew a bit more and it's apparently the flyback transformer that's giving up. Down side is that for my model it seems more or less impossible to find a replacement these days. I guess I need to start looking around for another monitor instead.
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30 May 2024, 22:45 | #8 |
CaptainM68K-SPS France
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30 May 2024, 23:13 | #9 | |
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31 May 2024, 10:00 | #10 |
CaptainM68K-SPS France
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31 May 2024, 12:38 | #11 |
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31 May 2024, 15:28 | #12 |
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Opened it up and took an image of the transformer.
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31 May 2024, 23:27 | #13 |
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All solder joints should be reflowed before replacing parts at random. Especially on something as heavy as the line transformer.
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31 May 2024, 23:58 | #14 | |
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This I can pretty much do myself so I'll have a go at this and see if that helps. I doubt there's any residual charge left anywhere since it hasn't been connected to anything for about 4 years? |
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