Horzontal lines across top 2" of screen on both my Toshiba TVs?
This just occurred past 3 mos. - first one TV, then the other started with the horizontal lines. Newest was purchased 2004. Cablevision just left my house and Cablevision claims both my TV tubes are "going" - that I need two new TV's. If it was just one TV, I wouldn't question this - however, what are the odds both TV's (both Toshiba's) would have problems simultaneously. Has anyone heard of this? Hey, if they're on their way out, fine; but just curious if anyone else has had similar issues.
Thanks so much for your assistance!
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Re: Horzontal lines across top 2" of screen on both my...
It's NOT the "tubes" (the glass picture tube you view) this is 90% of the time a capacitor in the vertical circuitry. A good TV tech can find and fix this issue for probably a little less than $100 per set at the most.
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One of the circuit board ribbons connected on the vertical control is probably loose there is a few vids on you tube for this repair , failing that some of the driver capacitors need replacement with higher voltage caps same microfarad.
Some components in the vertical deflection amp have been going out of spec with age.
The set may no longer be worth to spend money to service it because of its age. However, if you wanted to invest the money, the set is serviceable. Considering its age, the CRT may be soft, and there are many other older components that can soon fail.
This is for the original problem.. Not the second post.
It's a problem in the horizontal deflection circuit. The parts will be available, but you will be in for some daignostic repairs also to find out why it failing or if it has failed on it's own.
There should be a few caps near the IC (an LA7840) that could also be causing the problem. Click the link, it will make it easier to locate the part inside.
This is the kind of repair best left to a TV tech, but get it done now and it won't cost anywhere near as much as it will later.
1.Are these lines only in the upper 1/3 rd portion of the screen?And is there a clear demarcation between this area and the lower portionb, where the image is perfect?
2.Or is thin Horizontal lines evenly spaced around an centimetre apart?
If it is the first case, then there si a problem with your TVs SMPS. It is not generating the required regulated 110V required for the TVs functioning.
If it is case 2, then there is a simple adjustment at the back - 'SCREEN'. This adjusts the Screen Grid Voltage, and by slightly lowering it, this problem will go away.