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your crt is getting weak you can get around this buy adjusting the screen control ...... the screen control is on the small board on the back of the picture tube . remove back , with picture tube flashing adjust screen control a touch one way will make it worse and the other will stop the flashing . only move it as much as you need to - no more . this will work for a while and you can do it again and again when ever needed . but the picture will not be as good .... as far as the free dead sony , i would get it . changeing a picture tube from doner tv is just plug and play on a sony . so you can have a new tv for free with just a little work ..........if this answer helped please rate it 3 or 4 stars . a high rateing will help keep mein the paid answer department thanks
Guess I should have looked throught the next couple of posts... The problem you have there you will not be able to repair yourself but a good shop can fix it temporarily. The CRT (Cathode Ray Tube) or picture tube is shorted, that's what is causing your blinking. You can call around and ask a shop locally if they can rejuvenate it for you using a crt analyser. In the shop here we use a BK467 which would fix the problem for awhile. What they will do is take the back off and hook-up the analyser and remove the short temporarily. That fix could last weeks or even months, in most cases though never more than a year. Turn the RV1791 back down, it has nothing to do with the G2 voltage and you don't want to overdrive the crt anyway. Take it back down until the horz. lines disappear in dark scenes or background. Then take it in and have the picture tube rejuvenated. Then start shopping for a new Tv... You'll need one eventually but this will buy you a little more time.
Sounds like the high voltage is marginal.
My experiance is to not put money into a TV that is over ten years
old. TVs stress out their electronic components worse than almost
any other electronic product. After 10 years, there are so many
parts that are ready to fail that your are probably wasting your money
trying to get any more life out of it.
Another option is to wholesale replace the main board by sending it to Module Exchange at 972-298-1212,
or PTS Electronics 800-844-7871 ptscorp.com.
Be careful on buying a new one though. Often times, these new
technology ones are much worse. Always Google the model number of
the set you intend to buy and add the word 'repair' or 'complaint' to
see if it is one of the many models that are customer service
nightmares being produced by even the most reputable companies today.
Hope ya fix it!