A friend of mine had an extra(!) TRS-80 Model 100 and offered to send it to me. I of course said yes!
Worked when I got it, but immediately started having LCD contrast issues. I found an article that describes my experience exactly, so hopefully this is just some old, tired caps. http://technobly.com/2016/08/21/fixing-a-trs-80-model-100-lcd-issue/