There was a black cardboard, that was sticking upward, from the bottom of the case, and I have forgot where it suppose to go.
I have pushed it, behind the color wheel shield(the one with the round hole). I have assumed, that it was for blocking the light.
While running it, I have noticed a light bleed through the exhaust vent, that was bothering me. It was next to the image projected on the wall, very noticeable.
I thought, that it's coming from that shield and I have pushed on it a bit, to close the gap. Than, it started to make some weird buzzing sound and than it popped.
Hey, it's my first projector repair, I'm learning. Next time, I will take pictures, before I take something apart.
Living Room: Samsung UN65JS8500, Onkyo TX-NR656, Klipsch R-28F, Klipsch RC-62II, Klipsch R-14S, Polk Audio 80 FX/RT(Atmos)
Bedroom: Samsung UN55MU6290, Onkyo TX-RZ610, Onkyo & Fluance speakers
Garage: Benq HT2050A, Elite Screens 125" motorized screen, Klipsch RP-160M, Klipsch RP-150M, Klipsch RP-450C , 2 x Klipsch CDT-3800 II for Atmos, Klipsch RW10