You need to provide more details.
1. What were the 2 items that were installed?
2. Did the work involve your TV or any area close to your TV?
3. When did you find the TV damage. At pick up or days/weeks after?
Did they not offer to compensate you at all especially the screen door latch? The screen door latch probably just broke. That is a small cost item that any Service center would fix for free regardless of who broke it. Doug
PS, it is NOT the norm. That is a dumb statement. There are hundreds of thousands of RV's worked on every month in the USA and very few sustain damage. Just because it happened to you does not make it the norm.
