High pitch noise coming from the flyback, it comes and go, there's nothing wrong with the tv except for that noise. i have posted my problem yesterday and someone have answered it he said that i should replace my flyback, thank you for the advice dude. last night i tried to tap the rear of the tv and the noise dissapear. if the noise will come again does it mean that the flyback really needs replacement?
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Re: high pitch noise from the flyback
You can tell to some extent what it may be by listening carefully and trying to identify the location. If you, remove the back cover of the set; stay away from danger, just listen to where it seems like the sound is coming from. If it is coming from inside the high voltage cage it is the flyback. If coming from around the main power transformer it is one of the power supply parts.
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First, you will want to isolate the problem. Is it feedback from an AC outlet you have it plugged into? Is it a recent noise that just started with no changes to Tv or its environment, then you may want to consider that a circuit is going and decide if it is worth repairing, You should find that type of fix at a shop for under $100
Update on finding replacement tripler (Flyback Transformer) for RCA F27442tx51. This is a follow up on my report dated Jan 12 2008. Further investigation revealed the Horizontal drive transistor was also blown. It is a 2SD2578. Internet search turned up ACME ENTERPRISES in Orlando Florida. www.acme-slaes.net. Surprisingly they also sell Flyback Transformers as well as other TV repair parts. The cross reference for the needed Flyback is ACME-2236 FBK. The part number for the transistor is 2SD2578 SANYO TRANSISTOR. The price for the transistor is $2.69. The Flyback is $22.95. Shipping to CA is $6.75 and handling is $1.99. Two days after ordering, the parts were at my front door. The set works now except the picture still goes off after 5 minutes or so and then comes back on, sound still works during the dark period. The original symptoms before it blew out in the middle of the night and started chirping. I now have the set on the bench attempting to find the intermittent part. Stay tuned I'm on the hunt.
According to the Samsung website: "The high pitched sound you hear is probably coming from the flyback transformer. The flyback transformer converts the relatively low voltage electricity that comes from the outlet in your home to the high voltage electricity needed to drive the cathode ray tube in your TV. It is not unusual for a flyback transformer to buzz softly when it operates. However, if the sound is loud and high pitched, it probably means the transformer is failing. To eliminate the sound, you will have to get your TV serviced."
You have a problem is in your horizontal section which also is part of your power supply. The high pitched whine is from the Intergrated High voltage transformer (also called the flyback transformer). This sound occurs when the freuency of the transformer changes and or the voltage gets too high. The click occurs as a result of the drawing of excessive current by the HOT Horizontal output transistor. This is repairable, but requires the correct equipment and a schematic.
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.