Re: LG 49SK8000 intermittent dim backlight zones



Ok I'll give that a try. My initial thought was that the backlight itself is ok since when it powers up ok, it continues to work fine indefinitely.

I feel like it very rarely did this when it was relatively new also - should have replaced it or addressed it back then while it was under warranty. But that also makes my think it's not just a worn out backlight....

Re: LG 49SK8000 intermittent dim backlight zones



The eco mode and ambient light sensor is turned off. This phenomenon happens with local dimming off altogether. Local dimming isn't that useful on this TV because the dimming zones are so huge (6 vertical sections basically).

My guess is a bad solder joint, which could be anywhere, or something with the driver section of the PSU....

Re: LG 49SK8000 intermittent dim backlight zones



Thank you for the suggestion. Firmware is up to date using the built-in updater. I had long hoped that would do the trick, but no dice....

I have a 2018 LG 49SK8000 with a bit of an odd problem that I haven't seen discussed elsewhere. It's an edge-lit (bottom) LED UHD TV with local-dimming (6-zones I believe). About 5-10% of the time when I turn the TV on after it hasn't been used for a couple hours, one or more backlight zones will not power on normally.

Some observations:
- If I power off (standby) and back on, it almost always works normally and continues to do so indefinitely.
- If I switch inputs, the zone will briefly light up and then go dim again.
- If I change the video preset (e.g. cinema...

Re: New Members - please post your introductions here

New guy here that gets a kick out of fixing things. Joining badcaps to get help repairing my TV, but potentially other items in the future.