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Toshiba HD ready TV ct 90158 makes high pitched sound

This TV has worked fine for a while until the last 6 months. 6 months ago, it made a high pitch sound when I turned it on but the audio from the speakers was fine & not distorted. But the picture was distorted in that I could not see the video..but I could barely make out the channel numbers & menu a little. I turned the set off & back on again. It worked & I had clear picture & sound. It happened again almost a month later so I decided to unplug the HDMI cable & the high pitch noise stopped. I plugged the HDMI back in, I was using a HD cable box at the time, and turned TV off/on & it was fixed once again. I decided to save some cash & got a regular digital cable box since then. During the 6 months, the problem would happen more frequently & sometimes required me to turn the TV off/on more than several times to get the high pitched noise to stop & the picture to return. Now I've been trying to get it to work for almost a week now. I've tried leaving the set unplugged for a day, then for two days with the same result. Any help is appreciated

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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.

Posted on Oct 23, 2013

  • Lee Seabron Oct 26, 2013

    Ok thank you so much I will check them out. I've never opened a tv set before so I'll look up some diagrams & safety instructions before I do. I'll let you know how it goes.

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SOURCE: will not turn on just makes squeeking noise three times

Replace IHVT (xformer) Part #259296

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SOURCE: high pitched whine

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

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SOURCE: T.V. TURNING OFF AFTER ABOUT 5 MINUTES.

Go to Samsung.com for solution. There is a switch that just needs to be repositioned behind access door on rear. Fixed my HL-S5086W ok.

Posted on Dec 14, 2008

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SOURCE: HL-R6768W not turning on. High pitch spin sound. Bad color wheel?

The high-pitched whine is definitely the color wheel.  The early color wheels had problems and many had to be replaced.  As part of the turn-on process, the TV checks for light and then checks for color wheel sync.  If the bearings are wearing out/dried out, it could cause issues with getting the proper color wheel sync, causing the set to not pass the turn on sequence.
Check Sears or partstore.com for a color wheel.  I like sears for experimental replacements since they allow easy returns.
BTW, mine is an early 61".  My color wheel was replaced when I had to replace my Light Engine.  My in-laws 50" was an early one and theirs went out within 2 years.

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SOURCE: Toshiba 44NHM84 won't turn on

Usualy these problems are due to solder evaporating under the heat of the component.If you are a competent technician,by opening the tv set and by looking closely on the solder part of the board,
you should see a few that are not as shiny as the other, or look like a donut around the pin.these should be redone.those failiure are around the components that heat up:voltage reg,h-v reg and the
resistor around them.
good luck

Posted on Jan 28, 2009

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