screen went dark with a flash of green down the middle pip is dark also,have audio.Can turn set off for 1/2 hour to over night,it'll come on & look great for anywhere from 5 min. to several hours.Had in home repair for the same symptom about 8 1/2 mo. ago,repairman suspected a horiz. problem,my wife said it took him longer to open up the set than to make the repair,she didnt see all that he did, it would seem that a circuit opens intermittantly. I have built several electronic kits,including a Heathkit color tv, so i'm not bashfull about opening this set if you can point me in the most likely direction to go, for a old toot my hand is still pretty steady with a soldering iron . Beside keeping it unplugged,what else should I do to not make things worse removing or damaging something that shouldn't even be touched , she did say that he worked on the lower left side looking from the rear. Am hoping to keep this this set working for another year or more. didn't know about this site till recently or i'd not have had someone else work on it.I've read most of your answers,now i'm thanking you in advance for your help;don bolt

