Common sony trinitron power supply problem

Sony power supply problem, R607/Q601/Q602 - Q502 dead. Replaced these parts, TV worked OK for a week. Then dead again. Replaced FLAYBACK and same parts again. Added 5A-250 V fuse in series on Q502 . Now TV works for 2 minutes, then shuts off the VIDEO on its own. Audio is OK. Turn it off, wait a minute, starts working again for a minute or two.. (FUSE is not blown) I am guessing my FLYBACK is no good (I bought it for 17 dollars) ANY FEEDBACK ??

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