I have korg pa 50 fd my screen say korg pa 50 i get only one thing my paino work only

SOURCE: korg pa-50 no sound from right speaker but has sound from left

Several things to check:

If the speakers are cut off when externaal cables are connected to line outs, possibly the jack sensing switch for the right channel thinks that a plug is in there... you might cycle one in and out to see if that might fix.

Another thing is they LIKELY have a PAN control setting and it might be set full left. The external MP3 would NOT be under PAN control, only the keyboard voices would be affected by it.

SOURCE: I am trying to get the LED darker so I can see it

Try as you might, there doesn't seem to be a contrast control on this unit.

Things to try:

Shielding from light.

Polarizer similar to those used for privacy on computer screens.

Try a color filter, possibly orange.

Maybe a good old umbrella as silly as it sounds... there just isn't any way to darken the display.

The display by the way is NOT and LED, but a LCD on this unit.