The LCD controller or T-con board does not control the back light. Some back light ballasts are incorporated into the power supply or the main board. Others are on their own board
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Assuming you can still control the thing for flight I assume your complaint is just about the display on the controller for in flight video. This could be a problem localized to just the controller, my most likely bet. A bad display caused by a faulty backlight for the lcd, maybe a bad connection between the inverter for the CCFL backlight could be a likely culprit. Have you dropped the controller? Shine a flashlight onto the screen when you think you should be getting video, have the drone looking at something with high contrast like large black lettering on a white background, where the light shines on the display on the controller do you see the image? This would indicate a bad backlight. You could alway take the controller apart and look for a bad connection, specifically the flat ribbon cable that connects the LCD to the mainboard and the black/red wires between a inverter board to the CCFL backlight that is behind the LCD display.
Or if that sounds like a lot of work, try for a warranty return.
There is no adjustment to control the brightness in korg pa50/sd.
It is hardware problem.
-Is the white backlight that is too high?
or
-normal backlight,but words is too dim?
Both of that case,can be caused by damage / change of voltage control for lcd. Perhaps there are parts that are damaged or have changed in value. Typically capacitors etc.
If the backlight is too bright, then the damage is in backlight controller, may transistor or an inverter transformer.
Proceed with the repairs to the experts.
The screen controller circuit board isn't working. The board you're looking for is the one that has the wide flat ribbon cable coming from the bottom of the screen
The problem you have mentioned can be either caused by a backlight inverter malfunction or T-COn(LCD controller malfunction). Take a flashlight and focus it on the screen from a close distance. See if you notice a dull image. If you do then the backlight inverter is the source of the problem otherwise, its the LCD controller. Both of these boards are pretty easy to replace, if you have worked on electronics such as computers below, as it only involves unpluggin cables from the older boards, and plugging them into the replacements. If you wish to do it yourself let me know the make and model of the tv so that I can help you find the replacements and advice you on replacing them.
The LCD backlight is faulty. it may be due to bad capacitors or a faulty inverter controller. Bad capacitors can be easily replaced. A faulty inverter controller is a bit more tricky but it can also be replaced.
Might be ur controller inverter board or main video backlight board.Ur video does show up a picture right?That the only two boards that related to video.My adviced to u is buy the controller inverter board first tried that,if not work return it for money back,but must pay restocking fee.That the board between the power supply and main backlight video board.Than u know for sure it the main video backlight board.
The way to isolate the failure to the power supply would be to measure the voltages going to the backlight inverter board. If all the voltages are normal then is more likely a defective backlight inverter board or LCD controller board.
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