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Buzzing Noise (low frequency) from INSIDE my HDTV!

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Old 02-19-2010, 12:01 PM   #1
bigapplebronco
 

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Default Buzzing Noise (low frequency) from INSIDE my HDTV!

I have a Philips 42" HDTV (model 42PFL7422D/37)

I recently started to hear a low frequency buzzing or humming noise coming from the back of my TV. It is coming from directly inside the TV. I have noticed that it is present whenever there is a signal input feeding the TV (i.e. the buzz goes away whenever you remove the source, be it the cable box (Scientific Atlanta Explorer 8300HDC) or my PS3).

- With the TV on and a source feeding the TV, the buzz is present.
- With the TV on and physically removing the HDMI cable (from either the cable box or the PS3, whichever one is actively feeding a signal), the buzz goes away. Plugging the HDMI cable into a different HDMI port causes the buzz to come back. Switching to a different HDMI cable does not solve the problem.
- With the TV on and switching from HDMI to component video, the buzz is still present.
- Only when removing or turning off the source feeding the signal to the TV does the buzz go away. It does not matter what port (HDMI vs. component) the source feeds.

I am doubtful that I have a ground loop problem because it is not coming from my speakers or subwoofer and is the same amplitude regardless of volume level. It is also present regardless of the audio system being plugged in or not.

From my research so far, and because the buzz is only present when there is an active signal being fed to the TV, I think it is probably related to the tuner/converter (or whatever it's called) that takes incoming signals and processes them for display.

Any thoughts or ideas? Much thanks!!
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Old 02-19-2010, 01:08 PM   #2
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Unplug the TV from power for at least 1 hour, plug it back in and see if the hum is still present...
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Old 02-19-2010, 03:31 PM   #3
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Quote:
Originally Posted by Loves2Watch View Post
Unplug the TV from power for at least 1 hour, plug it back in and see if the hum is still present...
Thanks for your suggestion. I tried it this afternoon after reading your post, and the buzz still remains.

It is still present whenever a source (any source, any cable, any port) feeds a signal to the tv, but always absent when that source is turned off or removed.
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Old 02-19-2010, 03:56 PM   #4
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UPDATE: I decided to reset the video settings on my TV (contrast, picture, tint, etc), and low and behold the buzzing improved dramatically.

I had my contrast set very high before, and by lowering the contrast the buzzing gradually disappeared. To get the picture I wanted, the buzzing came back very slightly but at a level that I can tolerate.

I am still concerned about why this is happening at high contrast levels, especially since I have had these settings for 2+ years and never had this problem before until about 2 weeks ago.

Any ideas or feedback? Thanks!
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Old 02-19-2010, 04:35 PM   #5
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Any ideas or feedback?
Sounds like those cheapo capacitors Philips is notorious for are about to blow! I predict that within 2 months your set will be belly up and ready for guttin'....

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Old 02-19-2010, 04:56 PM   #6
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Sounds like those cheapo capacitors Philips is notorious for are about to blow! I predict that within 2 months your set will be belly up and ready for guttin'....

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Or the cheap power supply is failing. Another known issue with Phillips TVs.
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Old 02-19-2010, 05:53 PM   #7
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Sounds like loose transformer windings in the power supply. The more current you draw the stronger the magnetic field, and the more the windings vibrate. Usually this is at 60 Hz line frequency. With the higher contrast you're working things harder and drawing more current. It doesn't necessarily mean that there's a failure in the works, but it does indicate a cheap transforrner/power supply. It won't get any better on its own.
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Old 08-08-2011, 10:50 AM   #8
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Default It's all the Buzz

I had the same buzzing problem started 6 months ago and buzzing kept getting louder and volume kept getting lower until could not stand it anymore & finally fixed it. In my case I have a Scientific Atlanta Explorer 8300HDC cable box and a Samsung HDTV. Found as others, noise would be present upon connecting cable input to cable box. My Samsung TV has two separate video/audio connections I have the cable box connected to one and the DVD connected to the other. I noticed when TV was switched to DVD mode sound was great but when switched back to TV mode poor sound returned this led me to believe TV sound system was not the problem as it worked fine with DVD. Called my Cable company and technician went through all my TV & Cable Box settings to verify they were set properly, and told me to pick up & install another cable box. After installing the new cable box sound came back to normal. I still hear a very low buzz when TV is on and cable box is turned off, but buzz cannot be heard once cable box is turned back on. It is not a problem for me, maybe one day I'll have a cable repairman up to diagnose it.
Warning if anyone is not familiar with hooking up video/audio cables or patient enough to might having to go through hours of talking to one or more cable representative's on the phone (in my case first replacement box I was given didn't work), I suggest Don't try hooking up and activating a cable box yourself.
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Old 08-09-2011, 05:10 AM   #9
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Sounds to me that it could be a dirty fan, kicking up to a higher speed once
new perephials are added. See if there is a fan, dust it off and vac out the
dust. Don't use comp air.
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