| T O P I C R E V I E W |
| riccbhard |
Posted - Dec 09 2006 : 02:37:15 AM
Lately I've noticed that after my relatively new (~3 year old) TV is starting to make a really high pitched squeal after it's been on for about 3 1/2 hours. Sometimes it will stop for a few minutes and then come back again.
Could this be any hint of something failing?
Just now as I'm typing this it went *pop* really low and the squealing stopped for about 10 seconds and started again. |
| 3 L A T E S T R E P L I E S (Newest First) |
| cyclopsitis |
Posted - Jan 08 2007 : 09:54:40 AM
Hey Buddy, I can't believe I missed this question on here. It may be your HV flyback IF there is picture distortion when it pops. IT may also be a coil in the PSU or near one of the many oscillators for VH or HH. IF it is not there then it may be a leak in your HV cap causing the problem. Sometimes the foil vibrates causing a whistle sound. Just to let you know this is a pain in the butt for most seasoned TV repair techs so you may spend a lot of time finding it.
The easiest way to narrow down where in the circuit it is producing this sound is to use a stethoscope. You can just use your ear but it can hard to identify the exact location.
Hope that helps.
Ken
|
| Aaron Cake |
Posted - Jan 08 2007 : 09:42:55 AM
You're hearing the flyback and/or vertical scan. The "pop" was likely an arc that formed on the HV cable from the flyback to the tube. You should examine that cable and replace if necessary. |
| CurrentOverflow |
Posted - Jan 07 2007 : 2:07:58 PM
Not that im an expert about anything but i would say test to see if its your speakers. If youve had them on at a pretty loud volume over the years they are probably burning out. If your tv has an extra speaker plug or something like one of my old ones does try hooking some up. If they squeal too its something electrical, bringing it into a repair shop would probably be wise if you have no experience with tvs because there is probably a chance of you making it worse.
heres something i found that might help
TV's & monitors's are "full" of oscillators. Virtually everything relies on an oscillator. I would guess that you are quite young, your hearing is very good. I think, What you are hearing is the oscillation of the deflection yoke, The deflection yoke is just a transformer. As the coils oscillate, they vibrate. Although they are dipped in varnish to reduce the vibrations (by glueing them together) sometimes they still emit an audible sound. |
