HmanT posted an answer for this LG Televison & Video:
"One suggestion may be to check the ShopJimmy videos on YouTube. There is a flashlight test..."
HmanT posted a question about RCA LED55C55R120Q 55" 1080p 120Hz LED HDTV Black:
"I have removed the back, disconnected and reconnected all plugs/cables, but this had no..."