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Re: Weird sound coming from the inside
TV needs some kind of service and dust inside to be removed.
Regarding sparks sound, it can be leakage of high voltage of Fly-back Transformer. Qualified tv technician can check and repair it as high voltage risk is involved here.
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Check the EHT boot cap for damage. Contact any experienced service technician. Extra High Tension arcing is going on inside. Do not turn ON this TV, until the fault has been rectified. It might make more parts to get damaged.
Not really a solution but i have the problem with mine< opened it up and it's part number 38-102 or ex3401 which appears to be a open fuse by the AC in on the board. When I bridged the open, melted gap it turned on, smoked, and melted again with a spark so be that as it may there's got to be something going on here that can't be too hard to fix but the repair man will make more on the sale of a new tv than fixing the old.
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."