LED strip replacement

[Nick's Tvs]

General question about LED strips

The following led strips:
6916L-1175A 6916L-1177A 6916L-1174A 6916L-1176A
Infamously known and used in a variety of the 47" LG Tvs to fail early and in my experience the most common failure in the set. We have adapted, and now have repair services available for this set thanks to Electronica.

My question to BADCAPS!

What set have you noticed or predict to show similar traits to the 47" LG and constantly fail with bad LEDs?

I remember only about a year or so ago, maybe even 2 years, it was almost impossible to find any of the LED strips for the LG sets mentioned above. I guess most people didn't think to keep those on hand when stripping the tvs. The very few people that did have the strips would charge $50 minimum per strip on ebay and they would get sold instantly!
Now we are seeing them at $15 per strip or $80 for all of them thanks to the repair service and people realizing that they need to hold on to these strips when breaking down cracked screens.

Anyway just trying to get ahead of the curve and stock up early.

[RCA2000]

Re: LED strip replacement

ALL of those cheap, single--board LED BL sets...with a SINGLE board... and with a THIN profile around the panel. ALL of them seem to lose the LED strips a LOT. brands such as Seki, and even JVC uses them..

[ReeceyBurger123]

Re: LED strip replacement

Its the same with all Led Tv's, they simply over drive them !

Even on the lowest brightness setting for the Leds they still get soo hot, this causes the Dye bond on them to break down fast and over time it cracks causing the whisker of the Led to break contact failing Open Circuit (OC) or to short circuit and burn up (SC) either will trip the protection circuit in almost every case.

They wire them in series bit like older christmas lights, so it only takes one to fail OC or SC before the protection cant load them all (detects change in current due to one being failed) and it shuts down the whole lot.

The reason why the over drive them is because they cost cut, they try to add less Leds into the panel therefore saving money but still need to maintain the same brightness so they push the ones in there to the max to keep the brightness high but this causes them to wear out so fast.

In a way they could get away with over driving them and keeping them reliable by simply heatsinking the Leds better so they can cool but that costs them money so why would they do that ? They last just enough for the warranty to wear out then take a dump.

The best method of driving the Leds would be to supply them with 3v at low current but enough to keep them bright but keep them in parallel so if one fails the others will still work but doing that uses more energy than in series so they stick to that.

Tom66 has a good theory about keeping them in series but using a monitor chip which keeps the Leds on and shorts/skips one out if one does fail so they all still work, this would work better but again more money for the manufacture.

[ReeceyBurger123]

Re: LED strip replacement

Also the reason why you are able to find the strips is probably because people are salvaging them out of smashed and failed Lcd Tv's more than back then as Leds rarely failed 2 years ago due to them being fairly new. I will be uploading a youtube video soon about how to repair the original Led strips in Tv's.

[RCA2000]

Re: LED strip replacement

Its the same with all Led Tv's, they simply over drive them !

Even on the lowest brightness setting for the Leds they still get soo hot, this causes the Dye bond on them to break down fast and over time it cracks causing the whisker of the Led to break contact failing Open Circuit (OC) or to short circuit and burn up (SC) either will trip the protection circuit in almost every case.

They wire them in series bit like older christmas lights, so it only takes one to fail OC or SC before the protection cant load them all (detects change in current due to one being failed) and it shuts down the whole lot.

The reason why the over drive them is because they cost cut, they try to add less Leds into the panel therefore saving money but still need to maintain the same brightness so they push the ones in there to the max to keep the brightness high but this causes them to wear out so fast.

In a way they could get away with over driving them and keeping them reliable by simply heatsinking the Leds better so they can cool but that costs them money so why would they do that ? They last just enough for the warranty to wear out then take a dump.

The best method of driving the Leds would be to supply them with 3v at low current but enough to keep them bright but keep them in parallel so if one fails the others will still work but doing that uses more energy than in series so they stick to that.

Tom66 has a good theory about keeping them in parellel but using a monitor chip which keeps the Leds on and shorts one out if one does fail this would work better but again more money for the manufacture.

CRT"S are SOOOOO much more reliable and long-lived (for the MOST part...there WERE VERY bad CRT's out there..) ....than ANY of these "NEW TECH" displays !!

[ReeceyBurger123]

Re: LED strip replacement

Yep CRT are the tanks lol I prefer Plasma but only good built ones not Samsung and Lg trash maybe Panasonic but I think all of their Plasmas have some stupid faults so yeah, my favorite are Pioneer Plasmas they are the best engineered yes some have faults but others almost never fail ever and will last way over 20 years.

[steveanddawn]

Re: LED strip replacement

I stripped my first LED TV down yesterday (salvaged from the tip) lol. A Toshiba 40d1333b, the fault only turned out to be a bad connection on the crappy LED strips but for free apart from a few hours labour happy days. The build quality these days is terrible, LED is old technology, my Dad built a 7 segment display clock nearly 40 years ago.

[gdawg]

Re: LED strip replacement

I agree with ReeceyBurger123 on Pioneer plasma's. I bought one new in 2007 and still looks as good as the day it was new. Mines not even the Kuro. Its a Elite 60" and I would put it up against any 1080p lcd.!!!

[gdawg]

Re: LED strip replacement

Forgot to say- my plasma is the 720p version, right before the Kuro's came out.