Question about Zenith C27F33 27" TV

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High pitch noise

I have 2 of these televisions in the bar I manage. They are both 3 years old. They have begun to give off a high pitch noise. It could be after 20 minutes of use or up to 3 hours of use, or anything in between. Turning them off, resting (say 1/2 hour) then turning back on only eliminates the problem momentarily.

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  • joehegg Jan 04, 2009

    Where might the horizontal linearity coil be located

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What you are hearing is the mechanical vibrating of coils & or transformers in the tv. 1st and easyest is to hot glue the parts that is making the noise down. if that does not work, removing & reinstalling the part is next. the last is replacement. the most likely parts causing is the 1. horizontal linearity coil, 2. the run or switch mode transformer, or 3. the flyback transformer. good luck.

Posted on Jan 09, 2007

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Posted on Jan 02, 2017

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I am about to post a in depth guide about how to fix this problem. It's because a capacitor inside the TV has blown which causes the buzzing high pitched noise. It's really easy to fix however and only costs about £1 / $2 to sort out.

You can read a similar guide here http://www.fixya.com/support/r741402-polaroid_flm_373b_lcd_tv_black_screen but I will shortly be uploading a guide on the buzzing problem!

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It appears like your power supply is not filtering the voltage properly and that is why you are hearing that high pitched noise. If your LCD is less then a year old, you can call Polaroid to have it repair under warranty.
If more then a year old, check the info from this link to replace the capacitors.

Let me know if you need further assistance.

Oct 07, 2008 | Polaroid FLM-3734B 37 in. LCD HDTV

2 Answers

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The power supply is starting to fail on your LCD. The noise you hear is because the circuit is trying to provide the proper power to the rest of the circuitry and is forcing itself.
The noise does increase if you tune to an HD channel because of more demand for power for a brighter picture.
Let me know if you need further assistance.

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Hello there, You have to specify where the noise is coming from. Is it coming from the speaker or from the back of the unit. SMPS power supply powering your unit create this kind of noise when some capacitor gone out of their value.

Good Luck.

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