Originally Posted by jamor
Okay so I took off the entire back.. I figured out the source and I believe there may be a fix but I'm not an expert so I don't know the danger.
First off - here is the back:http://farm6.static.flickr.com/5124/...f8e14924_z.jpg
Here are two zoom ins of the UPPER RIGHT where the noise is coming from (1 with flash and 1 without):http://farm6.static.flickr.com/5248/...1267ff1c_z.jpghttp://farm6.static.flickr.com/5003/...4f6cf3fb_z.jpg
The buzz is clearly coming from the upper right chip that I zoomed in on with the 4 black metal pieces and 2 blue rubber pieces.
I can't tell exactly which black metal piece is producing it, but when I put a sock/underwear over the chip - the buzzing is completely gone.
I tried putting it on just the top half and bottom half of the zoomed in circuit board and the buzzing was reduced the most when only covering the top half of the large green chip which includes 3 black pieces and the 2 blue pieces.
All of the screws were as tight as can be so that wasn't the problem..
I'd like to put some fireproof insulation over it. Either the car dampening material or perhaps some fireproof glass wool of some sort..
I'm open to suggestions but I'm not going to put anything on it until I'm sure that
1: It is fireproof
2: Won't cause any electrical interference
3: Trap too much heat
All in all, that circuit board on the upper right is the cause. When I put a cloth/underwear over it, the buzzing is dampened to nearly ZERO.
I just have to figure out WHAT I can put over it without causing any type of damage.
Once again, I couldn't tell which black metal piece it was, but from putting cloth over it, the top half of the circuit board was the culprit.
Hope this helps!!
I did open mine too. No loose screws. The buzzing sound was the loudest from the center board (the main power supply).
I used your picture to show the middle pc board
I could hear the exact same noise that board emits to the other boards as you stated.
I too thought about sound proofing the inside of the tv but I thought to myself that this was going crazy when you are trying to fix something that way.
I had two concern about the insulation. Ruin the warranty and make the TV overheat as you know there is no fans inside that set.
The best way I had thought of insulating this was to use a 1/4 inch foam pad that has a sticky back. I could have stick that in the back cover beying carefull not to block the hundreds of vent holes. You still need air circulation.
I just try it without sticking anything and it did improve. The thin metal sheet back cover did not resonate metal sound anymore. If I had continue with this idea, the foam pad would have absorb also a lot of sound (specially high frequency). The insulatation would have been right over the noisy area but still, I had like 3/4" of clearance from the heat sink to the foam. Air could still circulate.
If I would have continue this idea, along sticking foam on the back cover, I would have stick also that foam on any other area where there is no boards inside the tv but I was not sure how critical "insulating" the back of the panel display could affect it from the heat.
All in all, I still think it would have made the temperature rise inside the set and I abandon the idea. Put everything back and return the tv.
I had a little bit left over from THAT ACOUSTIPACK PRODUCT
. I think it would have made the job done pretty good and silence that tv near silent even with the air vent holes.
But still again, I was not sure about the over heating and be sure you don't mind voiding your warranty when you stick that foam pad inside the tv.
Tell us what you decide and how it turn out !
Good luck !