The screen is to dark to see picture - sound works, but there is no picture. This happened once before and we adjusted the brightness, however, this time we can barely see the bar at the bottom to fix it. Can you help?
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Re: Screen is dark
If it uses the same technology as a laptop screen, there is 2 backlights behind the screen, they are like very thin fluorescent tubes (cold cathode) and there is a power supply that these use. It may have gone out like many PC's bad displays. I think it is due for replacement or an operation if you are skilled enough. Might just be an unseated ribbon cable which can be fixed by yourself.
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If your TV has already fully adjusted in brightness set up?, and there will be no good picture results?...try to adjust the "SCREEN-Screw" at the flyback slowly. If the picture still dark'?. the picture tube has need to rejuvenate.
Sounds like screen voltage has exceeded much. Its LOT adjustments should be checked. Contact any service technician.
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Try to adjust the screen voltage a little up. It sounds that either screen voltage has been gone low, or the sub brightness setting have some fault in circuit. See the screen control adjustment potmeter. It is Attached with line output transofrmer shown above. There will be to adjustment potmeaters, marked as 'screen' and 'focus'. Adjust the screen, the lower one, to a little bit, and try.
This sounds like low screen voltage(A1)try adjusting the a1 voltage bottom control on flyback transformer if you have a voltmeter, voltage on crt base possible market screen or A1 shoud be beteen 350/500 volts when making adjustment remember to take into account current taken by meter If voaltage will not adjust flyback transformer will have to replaced
There are two small holes on the rear side through which you can adjust focus and screen. Use a flash light and locate the two adjustable slots inside the holes. This part carries high voltage. Do not use a metal screwdriver to adjust. Put the TV facing a mirror so you can see how it works. Do not turn more than 1/8th of a turn. The focus control makes picture sharp or fuzzy. Screen control could change brightness. While watching the picture in the mirror, slightly adjust the screen control. Do not turn too much. If it doesn't work, then call a JVC authorized repair center.