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Re: tv wont turn on
All later TVs are really not 'off' when you turn them off. They have power to some circuits all the time if plugged in, otherwise they could not even respond to an 'on' signal from your remote.
The squealing you are all hearing is from a dying 'switched mode' power supply and is normally caused by a ferrite-core transformer running at the wrong frequency and complaining about it.
The problem with them is almost certain to be caused by failed or failing electrolytic capacitors (cheap to replace) but continued
attempted operation could cause further damage.
This problem is common enough that any half-way competent tech with a capacitance meter could weed out the culprits pretty quick.
I'm tempted to suggest you get these repaired if they were otherwise satisfactory since the flat panels too often seem to only survive the warranty.
If I was doing the repair, I would give you an estimate of under $75. US
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There is a short circuit in the high voltage circuit. the transformer who helps to create the high voltage or his power transistor is damage. replacement needed. the repair is not expensive, because the parts are average repair. Ask for an estimate.
Sorry to hear about your issue, let me see if I can help.
What type of tv is this? tube or flat panel? If tube, have you recently moved it and shook it up a little?
If panel, are you using an hdmi hookup or just regular cable from a cable box?
Be sure that your hookups are on tightly and that your cables are not tangled as well especially hdmi cable. Let me know if any of this is helpful in solving your issue or if I can be of more assistance. Once you respond I can help more, just need more information..
My Daughter has the same problem with hers. That high pitch noise your hearing is coming from
a transformer on the inside it means the transformer went bad and has to be replaced.I hope this helps a little.
most high pitch noise comes from the anode conection on the picture tube thats connected to the flyback anode cap thats mean there is a high voltage leak,to stop the noise you can discharge the high voltage take off the cap and clean with alcohol.if the noise continue.you will have to put some red or clear silicone both the cap and tube stick together leave to dry for about 2 to 4 hrs.this will eliminate the leaking.good luck.
That high pitched noise you're hearing is the power supply telling you that it has too much of a load on it and lowered its operating frequency which in effect cuts its output way down! Normally you don't hear any thing since the power supply operates at a frequency that's beyond human hearing.
In an RCA this indicates more than likely that your horizontal output transistor is shorted and this short was caused by the flyback transformer shorting. This is a common happening with RCA's
You'd need to take to a tv shop and have it checked out.