We have a GE over the stove microwave Model jvm1790sk01 that had the same problem with the display becoming too dim to see. We took the Control Board out and removed the plastic piece that it in front of the led display and we were able to read the display almost like it was a new unit. The piece we removed was not part of the LEDs on the control board but part of the cover between the outside glass and the LEDs. It appears to discolor over time with age and heat. This might not be the answer for all units but it worked on ours and hopefully will allow us to use it for another few years.