Reducing plasma buzz

Russinating

Russinating

Russinating

Soldato
Joined
27 Dec 2005
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17,317
Location
Bristol
I've recently bought an LG 50PK350 to replace a Panasonic TH42PX60B. My previous plasma didn't suffer from buzzing at all but the LG is very, very noticeable, especially on brights/whites.

It's wall mounted which I've read increases this due to the echo off the wall (although my Panny was as well).

Other than fiddling with the brightness etc which is detrimental to its visuals, what else can I do? Sound proof layer the wall behind it? Fiddle with/insulate the PSU/GPU (or whatever's making the buzz)?

Any advice appreciated.
 
Mine is within an inch or two of a solid brick wall, which I'm sure doesn't help. Where does the buzz come from, the GPU? Any idea of a household item I could use to test it first? A sock filled with kitchen roll or something :p.

Guess I'll have to get it off the wall and open the back up and give it a go.
 
MikeHunt79 said:
If the electrical components are buzzing then it's bad quality control. The most likely culprit will be loosely wound inductors or transformers... If this is the case then it's not just the noise that's the issue, they'll also be less efficient and also generate extra heat.

Now as a bodge in the past I've used hot glue on the offending components, and it does work, but if it's still under warranty I'd look at getting a replacement instead.

I hope this helps... :)
Click to expand...

It does kick out a lot of heat as well.

I don't normally buy ex-display but it was cheap, in mint condition, hadn't seen sunlight and being a plasma I thought that's actually got a silver lining as it'd have been run in more than enough.

The buzzing isn't just with whites though, generally anything bright. It was quite loud when watching Family Guy last night, despite Dyanmic Contrast being turned off and brightness on 50 etc (which looks rubbish). It also suffers quite badly from image retention, especially when playing games. You can even see the trail of the "No Input" graphic as it travels around the screen. My old Panny never suffered this.

I got it from Richer Sounds about 4/6 weeks ago but it's got a 1 year warranty anyway. I doubt I could get it replaced as it was end of line, but do you think it's worth returning and looking at another set?
 
Believe me, it's not rubbish :p. I'm tempted to record the bloody thing. It doesn't help that I did have a completely silent plasma before, but I'm pretty sure mine buzzes at an above average volume. I was playing with it last night and the buzz is more than audible from 6ft away even with the brightness turned down to 1.
 
It buzzes even with the contrast on 1, which obviously is unusable. Contrast is normally at 70-75 which looks normal.

Can someone point me to a guide for/run me through the hot glue solution? Bearing in mind I'm a complete noob when it comes to electronics etc.
 
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