When problem occurs do you have OSD (On Screen Display) i.e. Channel Number? If you do have OSD and it is of good quality, then the CRT or picture tube is Ok. If you don't have OSD then the CRT is suspect, but could also be a poor connection to the CRT filaments. To check for OSD leave TV in "Audio Mute" and when the problem occurs see if "Muting" remains on the screen.

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