I just had a newish (but out-of-warranty) LG 4k monitor go bad on me. The picture went mostly dark, with a few streaks of white. I figured how to take off the

I just had a newish (but out-of-warranty) LG 4k monitor go bad on me. The picture went mostly dark, with a few streaks of white. I figured how to take off the back panel, but then got them stuck removing the EM shield covering the main board. I got all of the screws off, but then it wouldn't come off.