LG 47" 47LV4400 Shutting Off LV Series

[Acesales]

Hello again, my year 2011 47" LG 47LV4400-UA is now shutting off after a few minutes. Turns on and works fine then loses backlight, sound, and picture. Power light does not change, stays blue. I don't see a BGA processor to reflow like other LV series. Do the edge type processors also have cold solder joint problems or is this a different issue? Thanks

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

Try this, for those few minutes it's on, go into picture menu-picture mode-backlights, turn them way down, then try the tv and see if it stays on longer.

[Acesales]

Re: LG 47" 47LV4400 Shutting Off LV Series

Ok, I was able to go in and turn brightness and backlight all the way to zero. It still shut off right away, seems like it's getting worse.

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

Try heating the electrolytic capacitors with a hairdryer for a few minutes, then try it while it's still hot, if no difference, check the bottom of board for anything obvious, check those solder joints, can search images of bad solder joints, sometimes the bad ones can be tricky to see but I guess mostly they will be cracked looking.

[Acesales]

Re: LG 47" 47LV4400 Shutting Off LV Series

Do you mean electrolytics on the main board or the power supply board? Thanks

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

Try powerboard first, no joy, try mainboard, it's just a little test that will bring the esr of a bad cap down just enough to let tv work for a bit if the cap isn't too far gone. Need to try it while it's still hot.

[Davi.p]

Re: LG 47" 47LV4400 Shutting Off LV Series

Examine with microscope or power magnifier the solderings of main processor

[Acesales]

Re: LG 47" 47LV4400 Shutting Off LV Series

I heated the electrolytics on the power board and it came back to life! It ran for five minutes then the wife said we have to leave so I turned it off. I tried heating them again and it won't stay working this time. Was heating them to lower the ESR a one time only test or was it all coincidence?

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

It's kind of hard to tell, I think I would switch out those electrolytics, they've been working hard for 12 years, even if it don't fix it, it will eliminate them from being the culprit.

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

If you don't want to change them all, maybe start with those 5 by the connectors.

[EazyBone]

Re: LG 47" 47LV4400 Shutting Off LV Series

I've seen you suggest the heating many times and first post I've seen work so far. Pretty cool. Curious to see results here. Post if you fix

[Davi.p]

Re: LG 47" 47LV4400 Shutting Off LV Series

I suggest to not replace any cap cause Delta brand uses best brands caps, here probably Nichicon, the test of haidryer has no evidence here, you probably are a newbie and end to replace with s**t caps, you can try to heat the cpu but an hairdyer is not enough for me , you need an air soldering station or heat gun

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

Some know it alls don't know shit, EVEN the best caps wear out and die.

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

I've seen you suggest the heating many times and first post I've seen work so far. Pretty cool. Curious to see results here. Post if you fix

You haven't been here long, that's an old test that's been working for a very long time.

[nomoresonys]

Re: LG 47" 47LV4400 Shutting Off LV Series

I didn't say take the caps out and throw them away, you don't have a cap tester, so I suggested replacing those 5 and see if it works, you can always put the other caps back in but why would you if you replaced them with quality 105 low esr caps. You would have to ask the "expert" that said don't replace them, lol.

[Acesales]

Re: LG 47" 47LV4400 Shutting Off LV Series

I reflowed most all of the through hole components on the power supply board. TV worked for about 25 minutes and shut off again. I'll look at replacing the electrolytics now.