Here's a weird problem...

[YamahaFreak]

RCA-branded 20-inch 'TruFlat' CRT TV, Model number 20F512T, chassis number M123SP, built May 2006. (I suspect many TVs used this base design under several brand names.) When plugged in, it sits for several seconds with the standby LED on, unresponsive to the power button. It comes on after a bit, immediately displaying the picture controls menu but otherwise okay...none of the front (top) panel buttons work unless they are pressed repeatedly, and even then the results are hit and miss. Same results using the buttons on the remote. I can't get any of the video and audio inputs to work, either. Hosing and drying the mainboard did nothing. I have never seen this odd issue before, and it has me stumped!