Problems with Leds SMD in LCD

[popelin]

I have a problem, I have 1206 smd leds blue that works well but when I put them in the LCD do not work. I have leds in red and if that works, they are such that the blue ones.

what is failing??

[Omnious]

you might be putting them upside down...

[Jesse IL]

Get rid of those. You want 2832 size. 1206 are for the radio.