If the screeen is starting to go black then you need to order a new lcd display they are about 160 on emab and they come with the instruction's but if you cannot sodder then don't try it send it in to have someone else do it but if it is not going blank then yeah it is a light swist kind I think superbrightled.com sell's them for like 1.29 each any color

You need to change your backlight globes, they are just little wedge globes behind the clock

easy