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Re: JVC TV AV27D305
Assuming the CRT is still OK, it could either be: 1. Screen Voltage is low; 2. G2 B+ is out (common problem is a mega ohm resistor open); 3. a resistor gone high (or open) in the DA converter of the controller IC circuitry.
Any of the above would require extensive knowledge of electronic circuitry and components, use of a DVM and a soldering iron. Perhaps your best bet may be to seek the services of a professional.
Pls likewise consider the age of the TV (if a couple of years) and/or the downtime and cost of repair,. it may be more practical to purchase a replacement unit.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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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.
My jvc 27" tv was so dark I could hardly see any night scenes, even with the bright all the way on. If you push the sleep button, let go, then hold down the video and display (together), the service menu will come on. Scroll down to #7 (too dark) and adjust the brightness there. Works immediately. Good luck.
How many years is your TV now? Usually TV has its life span, there comes a time that it happens. And need to look for a technicians, cause some of theme can still be repair by adjusting the brightness inside your TV.
The picture is very dark
it is mostly due to
1 power supply output is low.
2 voltage on crt g2 pin is low.
3 video output supply is low.
4 some components in luminance section might be defective or loose.
5 finally crt getting weak is set is old.
If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.
Open up the front of the set and find the screen controls and perform a grey scal alighnment by adjusting the red , blue , and green screen controls but be carefull and make sure you adjust them evenly or the picture will not look right. Good Luck