For the last couple of weeks a black bar randomly appears near the top if the screen. Sometimes it is just a blank bar. Other times there is some text in it. Last night it kept adding characters from the left. Sometimes it is a random character on the right. And one time yesterday it was a large black box the covered most of the viewing area. Pressing any button on the remote makes it go away but it may come back in 2 minutes or 30 minutes but it always comes back.
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Re: Black bar on screen
The text mode in the closed caption is turned on.Turn off the closed caption.
I don't have the schematic in front of me, so, I will wing it.
There may be a button on the remote that says CC, if so then use that button to turn it off, if not then go to the service menu and you may have to search a bit.
Either way it's an easy fix and you can do it yourself.
If you can't find it, then, reply and I will give better instructions when I get into my shop next week.
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Go into the TV's closed-caption settings and turn off captioning. You'll find it's set for "text" mode right now. What's happening is that in text mode, the set blanks out the part of the screen where the text will go but there isn't any. On channels or programs where captions aren't being broadcast you don't see anything. With the captions turned off the box will go away.
as a general rule, vertical faults can be divided into two types: ones that cause geometric distortion (a circle will not be round) and those that simply black out a portion of the screen. the former are faults in the vertical oscillator, drive, or output stages. the latter are blanking faults. blanking faults are almost always caused by electrolytic capacitors changing value and thereby changing the timing of the pulses which blank the screen during vertical retrace. In other words, the pulses are turning off the video signals at the wrong time.
the most common true vertical fault is geometric distortion and a foldover of white lines at the top of the screen. this is almost always caused by the electrolytic capacitor on or near the collector of the vertical output transistor or part of the IC which has the supply voltage (B+) on it. In the old tube days, the general rule was that bottom distortion was in the cathode of the output tube and distortion at the top was caused by a fault in the drive circuit. this may help the solution!!
blankenship, the "IK circuit" is blanking your screen, only "fix" is temporary, remove back of tv, and on rear right side (facing into the back of the set) you can see 2 philips type plastic screws mounted on the flyback transformer, one is focus the other is screen, do not adjust focus , turn screen control clockwise slowly until you get white retrace lines on screen, then turn counterclockwise until retrace lines disappear, this increases drive from tube to IK circuit, will last anywhere from 6 months to 18 months and then it`s replacement time, questions? e-mail me back. good luck, BMW Rider
This is a simple and common problem. The solder joints on the vertical output IC have cracked loose. I actually did a housecall on the exact same set with the exact same symptoms this morning! A good tech will resolder the pins of the vertical output IC and all other major solder joints on the main board and the set will play fine.
It sounds as you desribe, the vertical output IC and or the b+ feed capacitor off the Hi voltage transformer feeding the vert. IC its required voltage. Not a really hard job to replace, but not for a handi person to do. This should be left to the professional, as there are no user serviceable parts inside this set and with the HI voltage and the safety issues its best to call somesone to assist you with this repair. Good Luck