air conditioner lighting

friends last night I wanted to open a caurosphere, I realized that the lights of the keys do not light up, the screen is bright, I looked at it, there are 3 bulbs behind it, and the solid keys do not have any illumination or I have another problem.

The same problem exists in my vehicle, there is a lack of contact with the bulbs in that part. They burn when I touch the panel lightly in my hand. If the bulbs are intact, there may be a lack of contact

the service I had in my office took care of it free of charge: D

There are 3 bottomless bulbs on the back they are solid but those bulbs don't light up the screen.

recovered spontaneously last night