Lg 42lb6300 hdmi

[handsworth]

Hi guys, need your assistance on this one. I picked up this tv because the previous owner said it would not power up. I determined one or more leds were bad so they were replaced with a new set, and Voila, tv works. Now if I run cable to it, it works perfectly for days, however if I use any of the HDMI ports, it runs for about an hour or 2, then the backlights shut down. The image is still there and I have sound. All I have to do is unpower the tv or change input back to tv and they come back on. Can a bad IC on the main board cause this or should I replace power supply first? Im not good at reading voltages but another PS is cheap enough.

Oh another thing, this MB has 17,000 hours on it.

[freakaftr8]

Re: Lg 42lb6300 hdmi

No you probably still have a problem with the led's. If you notice on your picture in back light level your H DMI ports may be running the backlights at a higher rate than other ports so the higher the backlights go the hotter they get in then they break contact.

If that is not the case make sure that it doesn't have some kind of Power saving mode enabled where it would shut down the backlights if the TV was to sit for a couple hours running

[handsworth]

Re: Lg 42lb6300 hdmi

Thanks for the advice. After the tv was off for about 10hrs, I did a factory reset. I turned on the dvd player with uses an HDMI. The DVD menu was present then within 1 minute the screen went black. I switched to Tv and it switched, but the screen stayed black. Keep in mind I could still see images with the flashlight on both. Turned off the tv, turned it back on and the screen came back with tv. As soon as I inserted the hdmi, it went black again. I dont think the tv was on long enough for the leds to get hot and all settings were back to factory. Think I'll get a new main board.

[handsworth]

Re: Lg 42lb6300 hdmi

Looks like it was a bad power supply. I switched and so far so good. Still trying to figure out why the old one goes bad when I switch to HDMI.

[vinceroger69]

Re: Lg 42lb6300 hdmi

maybe a bad led driver ic etc failing under load some tvs you can set each section in picture settings, like tv to user profile, hdmi to movie or gaming,etc i wonder if these use a different brightness level hence leds being driven harder just a thought.