Question about Polaroid FLM-3734B 37 in. LCD HDTV

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High pitch tone from tv

37" poloroid flat screen has a high pitchsound it semsto get lower the longer it is on, but seems to have gotten worse any clues

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Hello, This is either a problem with the ballast or the switching transformer in your set. These two components often have this problem. The ballast supplies the energy needed to fire the backlight used to light the LCD screen, and the switching Power Supply Transformer helps with the conversion of AC to DC and DC to pulsating DC and then to DC again. These components are under constant stress, and they tend to cause this problem. In addition the circuitry attached might be causing the electrical stress and should be looked at also. I hope this helps, Thank you, Shuttle83 http://www.electron-age-technologies-llc.com

Posted on Jun 11, 2009

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Hello, This sounds as if it could be a switching power supply problem or a ballast problem. Both will effect your power supply and cause malfunction in various subsystems (audio, screen control, control systems, and the like). I would suggest having a qualified TV repair technician look at the set. This is because there are no user servicable parts associated with this type of problem. I hope this helps, Thank you, Shuttle83 http://www.electron-age-technologies-llc.com

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1 Answer

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