The flashlight trick is difficult-dark room, use the silhouette of the light. Not directly. Has to be from the top of tv screen angled down. Move it around slowly with adjusting the light it's self.
I used my phone's flashlight and had to cup the lighting my hand. Limiting the directability of the light.
Took me a few minutes to finally see it.
You can look through the back vents in a dark room setting with hand goggle's