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Vibration effect on TVs? Anyone else? (1 Viewer)

John_Pang

Grip
Joined
Jun 16, 2003
Messages
15
Has anyone had any problems with vibration and their TV monitors? Specifically direct views? I have a Sony KV-34XBR800 widescreen direct view monitor with a
Def Tech CLR2002 center channel spkr sitting on top of it. During loud passages at reference level SPL (80 dB)
I can see interference (look like dark “waves” on the screen) in bright areas of picture i.e. sky. It is very apparent on the CA: Full Throttle trailer, Tears of the Sun during the bombing attack and the riot scenes in Dark Blue, for example. I placed some Monster Cable Vibration dampers under the speaker but it did little to change the situation. Is this normal for direct view TVs, or is it something that I should have checked by a Sony tech under warranty? I had no such problems with my previous 41” Sony RPTV, but on that set the speaker and CRTs are separated by a few feet. I want to avoid having to build a shelf to place the speaker on behind the TV for a # of reasons, primarily speaker height will be incorrect, blocking of my backlight setup, and the extreme depth of the TV.
 

Allan Jayne

Senior HTF Member
Joined
Nov 1, 1998
Messages
2,405
The shadow mask inside the picture tube may be jiggling from the vibration and this can cause discoloration of the picture. Sony's are more sensitive to vibration because the shadow mask has long vertical strips that are prevented from sidewise or twisting motion only by two or three widely spaced horizontal strips.

There may be enough electromagnetic forces coming out of the speaker unit atop the TV to affect the picture tube.

Video hints:
http://members.aol.com/ajaynejr/video.htm
 

Jorge M

Stunt Coordinator
Joined
Feb 27, 2001
Messages
81
It might also be an electrical current issue. If you lift the center channel off the TV, does it still happen? If it does, try plugging in your amp, sub, or both to a different circuit.
 

Cliff Olson

Stunt Coordinator
Joined
Nov 9, 2002
Messages
167
I had this issue myself, and it went away with good quality cables and a Monster HTS-2000 surge protecter. I think the Monster surge protecter might have been the main reason, but I bought all the cables and surge protecter at the same time. In fairness, the center channel may NOT be the cause. It could be from the mains, or if even if you have a sub. Mine did it when listening to my stereo at high volumes (the center channel was off). I never isolated the exact cause, but I could care less since it's now gone!
 

JimmyK

Second Unit
Joined
Jun 21, 2002
Messages
479
Real Name
Jim
Sounds like magnetic interference from you center channel speaker. Even though it may be shielded, it my not be shielded enough to prevent problems, especially during higher volumes like you descibed.

Moving the center further from the crt (if posible) should solve your problem.

JimmyK
 

John_Pang

Grip
Joined
Jun 16, 2003
Messages
15
Thanks for the advice guys. After looking at the symptoms a bit closer, I think it is indeed magnetic interference, not vibration. The speaker is shielded, but when driven hard the speaker is creating a mag. field. I am going to be looking into building some sort of shield. Lifting the speaker a couple of inches off the set has helped but not alleviated the problem. I know that a shelf for the speaker would do the trick, but it would create some other problems that would need to be overcome.
 

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