K70 LED backlight of some keys dim

I got the K70 for almost a year now, I haven't being using the backlight until recently (unfortunately recently had to work late hence turned on the backlight)



anyways... noticed that some of the key's backlight are very dim. dimmer than the backlight on the dimmest level (and they dont seem increase in brightness when I increase the backlight brightness)



I took of the cap of the keys, and it seems to be the LED that are dim...

so what is werid is the keys that are having the issues are scattered all across..



left Ctrl, E, T, PrtScn, Home, Page Down



Any idea why that is? I tried unplugging etc... didn't seem to help... is there a hard reset of something ?