High pitched squeal coming from power supply on my philips VCR
We had a Brown out/Black out recently and the video started making a high pitched squeal from the power supply. Very occasionally after switching it off it will work for 2-5 minutes and then start making the high pitched squeal again with no power to the vcr. On the whole though it just makes the noise and no power to the VCR. I have removed the power supply cleaned it and viewed it to see it anything obvious would stare back at me. but this was to no avail. I am living in Australia and would appreciate any help anyone out there could give as this is the only useful site I could find. It would be much appreciated.
PS. It is a Philips VR3261/75
Re: High pitched squeal coming from power supply on my...
Hi , i am a hardware engineer in the uk here to help if i can,
the vga, doesnt normaly squeel , i have not heard of this problem , is the graphics card pci or does it go into the brown slot,if its pci the try change the card to a new one if its a brown slot where the card goes it may be the board slots blown as you say the vga only works for a few moments , see if that helps
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Aug 23, 2013 - Uploaded by ShopJimmy.com
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It sounds like either a mechanical failure shutting the machine down or the switch mode power supply just gave out. Repairing VCR's is not worth the charges these days BUT head to your local Goodwill store. There you'll find a stack of good VCR's for less than $10 each.
I had the same problem, it is a Diode on the Power Supply Board. The Location number is D1054, you should change C1051 also. It maybe leaky. I used a 10v 1000uf capacitor instead of the 6.3v 1000uf it had. Make sure to be careful when changing these components, making sure the polarity is right. Good Luck!
I have never heard a tube make noise when there is a good picture. Anyway, the noise has to be a transformer ringing or oscilating. They make a high pitched squeal when they have a loose winding or their cover is loose. You probably won't be able to feel or see anything loose on these transformers The power supply switching transformer is the first to look at. Take a hot glue gun and just cover the thing...especially at the base of it. The next (and only other) one is the horizontal drive transformer.It is located close to the high voltage transformer( biggest thing on board and usually in back or corner of the PCB.This one wont squeal) The horizontal drive transformer is about the size of a large marble and is encased in a black plastic cover. Cover it with hot glue also.
If you take the back off you will probably be able to localize where the squeal is coming from. You will probably need a signal to hear the noise also. After you find where it is coming from UNPLUG the set before doing any hot gluing!!!!
If you 're not up to this procedure take it to a technician. Your tube is not going bad and the set is definitly worth repair. Simple fix!! Good Luck!!