I have a LG 42LC7D that works just fine, most of the time. But sometimes it will randomly go black. No picture, no sound. After that, there are very rare flashes and audible pops, either white or green.
Then I will power it down for a while, and turn it back on. After a "warming up" period, (today it was 20 minutes) the Input label (HDMI, OTA Channel #, etc) will appear in the top-right corner of the screen, and the TV will function as normal. Then it will be fine again for a few days.
Any ideas on the cause and/or fix? Thank you.