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Flickering tv

I have a two year old (out of warranty) 46" samsung dlp tv. It works fine when initially turned on but begins to flicker after about an hour of use. The flickering is the same regardless of input (cable, component or hdmi). I have replaced the bulb, but that only extended the time it doesn't flicker from 20 minutes to about 60. Also, before replacing the bulb the tv would turn off after about 1/2 hour, while now it remains on but flickering. After turning it off for an hour or two it will again work find for an hour then begin flickering again.

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