My rpi work perfectly until I touch it, It not boot up then I found the L4 chip HDMI port is missing(I have touched HDMI port I think my fingernail pull it off...).
I found that tiny chip in the box tried to soil it back but no luck.(the board seems fine but the chip left 1 foot on board), I have checked no more chip missing.
Solid red + green light with/without sd card, no Video output and the usb port no power output. (green blink once after power connect)
I want to find what l4 is and try to replace a new one.
may have other reason make the device fail to boot. I have a Raspberry Pi 2 Model B.