JVC 27" CRT TV AV-27BP3 display shows single horizontal line
I have a 27" JVC AV-27BP3 CRT TV and occasionally the picture becomes a single horizontal line at the center of the screen. If I bang the set, or cycle the power it off/on (after 30sec-1min), the full screen sometimes will show again. After fully cooling, it seems to show a full screen most of the time. Sound and other functions all work fine.
The TV is 13-14 years old. Thanks for any suggestions.
Re: JVC 27" CRT TV AV-27BP3 display shows single...
I have a similar problem on my CRT computer monitor (AcerView 76c). It is an old screen and I think it is just at the end of its life, much like your TV. Having some background in physics, I would be pretty sure that the problem is with the cathode ray tube's vertical deflection system. The horizontal deflection electrodes are working while the vertical one is not. This results in a display of a single horizontal line (or in my case, a few superimposed) in the centre of the screen. Where both X and Y (horizontal and vertical) deflectors fail then the electron gun firing would result in a single bright spot in the dead-centre of the screen.
So really, we have no choice but to move on and buy a new set as repair is probably just as, if not more, expensive than replacement with a new device. Seeing as your post was in 2007, I hope you managed to solve the problem.
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this problem is caused by a faulty ir of cap's . First is c408 on the board it is a 100uf @ 35v i replaced with same uf and @ 50v , Second is a 2.2uf @250v and is c410 on the board replace both and your off to the races.
it could be an electrolytic capacitor or the vertical output I.C. in the vertical circuitry,if you remove the rear cover tap on the board in different places and see if the picture fills out or atleast jitters like it might fill out,then it could be just a cold solder joint,then remove the main board and resolder all joints and this should repair the condition you have
Go into your settings of the TV menu or there will be a single button on the JVC remote marked "CC" for closed caption. Press it or in the menu turn off the "TEXT" mode. With the text mode on you are allowing the TV to display text information wich means usually a black rectangular box that appears on the screen with no text in it. Usually on the cc button just press it until it scrolls through turning off the CC or text modes.
Sorry, no easy answer here. On an older set this would be
espected and not worth repairing, but you should take this to a TV shop
for troubleshooting. Most likely culprit is the flyback
transformer and/or the horizontal deflection.
Hope Ya Fix It.
I'll bet you have vertical output IC with some pins not soldered. This IC ( integrated circuit) is a "chip" that makes the picture fill out from top to bottom. After a period of time heat will cause the pins to crack loose on the circuit board.
You need to have a tech check it for you.
This is usually caused by a problem in the Horizontal Output section, around the Horizontal Output transformer usually a capacitor or diode going or gone faulty... the line you see are the Horizontal "Retrace" lines that are useually "Hidden" when the circuit is OK..
Since Intermitant always inspect the vert ckt for bad solder connections. If not replace the output IC they're cheap and most likely the problem If you still have lines on the top or bottom I would replace all of the electrolytic capacitors in the vert ckt also. Without much test equipment rebuilding the whole little ckt is the best way to go.