My fingers are crossed. Here's the best I could get (the TV is lying on its side):
A familiar scenario. Fewer and fewer slanty bars as you turn the adjuster. You feel like you're only one more turn away from a good picture, and then the adjuster can't turn any farther.
The TV may still have a multitude of other problems, of course, but it can't hurt to replace that cap with one of the right value.
Phil Nelson