Before I had a chance to order the stk392-1120s it got worse. I had the TV on and all was fine except I had turned the red down to nothing so the scenes were all green. I heard a strange very faint but high pitch sound. It was repeating like pulsing fo a second and stopping for a tenth of a second. The picture had gone off and that sound just started. I turn the set off and back on and all I get is that high frequency pulsing sound. Any ideas? I've watched it in "green" for a week now so I don't think I left anything loose inside. Thanks.
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Re: High pitch pulsing & picture now
I would check the set for bad connections. The high pitched sound you are hearing is the high voltage section. If the convergence IC has completely failed, that can cause this as well. Try using STK392-150 or STK392-180. Either one will sub since they are pin compatible and they both can handle more power, thus should last longer. Also, make sure that you use plenty of the heatsink compound when mounting these.
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A high pitch sound can be a capacitor losing power it would sound a bit like a fire work. most have back up on the board but it put more pressure on them the more times you use the tv. would check them and replace. all of them can be 5 in a row in some models.
Lamp is possible especially if the ballast was bad--it powers the lamp. Color wheel will usually display some issues--high pitched whine or fan like noise---with the lamp removed look where it faces--color wheel is there--any broken or missing pieces and it is the problem---
The wheel is directly connected to the set---set will detect if wheel not moving or moving too slow etc and almost instantly turn the lamp OFF.
The colors wheel is dead.That why,u hearing high pitched whining sound.The colors wheel is spinning off of is motor axis and grinding it sides walls,that where the high pitched whining sound came from.Hire a tv Tech. for the colors wheel changing,because it requiring to take out alots of the machanicals parts itself,before u can come to the colors wheel itself to change it.
Ok maybe this may help .... there is a coil LL08 I believe... somtimes it creates a high pitch whine like you describe.. its stands up on the deflection board..it basicaly a large coil of copper wire....you can take silcon and put on the coil...in effect damping the ocillations...hope that might help
In this model the horizontal drive coil vibrates and makes a high pitch squeal. Most times it is intermitent. Touching on the coil with something (non electrical, like wood) will make it stop or change it's pitch.
The fix my shop uses:
It's not to technical, but, we put fingernail polish around the coil. It's a remedy I've used for decades and has always worked. Some shops use a hot glue gun.
With the back open you can hear the coil to locate it. When fixing the problem have the set unplugged.
When a technician is working on a television while it's plugged in. He uses only one hand and stays away from the high voltage.
Seems like your television is doing the same thing as mine. I dont have a resolution but this may help from it clonking out completly. Leave it alone for now. My television started doing this months ago and I rarely even used it for the first two years due to deployment. One day it startd the high pitch, and i ignored it because i rarely turned it on besides when company came. About a month later it completly clunked out. Now i only get the green power light. NO pic, No volume or anything. Just that loud screech. Eventually it will go out, causing more problems. Usually you can go to a repair shop, get the piece name from them and then order and fix it yourself. The shop is going to do the same thing as you will, except charge you more for having ordereing it when you can do so yourself. Shops here charge about $60 bucks to let you know what it is... Shouldnt be a big change where you are.