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Is it just normal for LCD panels to have dark right and left edges?

post #1 of 25
Thread Starter 
I have recently been shopping for and burned through a few LCD TVs (I have the worst luck as I keep getting defective ones and even the replacements are defective) and I have noticed on all but one that the right and left edges exibit what appears to be some kind of darkening similar to vinetting however just down the edges, not around the corners.




Note the camera seems to enhance the effect some, but it's definitely visible with the bare eye.

Here are pictures of a recently purchased 42LD520 that show the effect. The netflix screen should be solid white edge to edge and red should also be solid edge to edge. However the only TV I have had this actually happen on is a Proscan believe it or not... and only one of 3 proscans (don't ask). I have seen this effect on 2 Vizios also and now this LG. This LG has an LG panel inside (peaked in the back).

Is this just how they tend to be?
LL
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post #2 of 25
You really shouldn't paint or assume ALL LCD's has such an effect - My 4 yr old Sharp 57" and my Sony Z5100 has no such problems at all with screen uniformity side to side or top to bottom.

Are you truly expecting a Holy Grail Panel --- you seem to be splitting fine hairs here - how does you BD movie content appear? Do you realize that the Netflix Display Static Image may not have uniformity - perhaps your expecting uniformity where the source is not. Showing a static splash and not knowing the true source may be a false assumption on your part perhaps or the Source is imperfect and it's being displayed that way. What counts is on the screen uniformity with dynamic displayed content not a static image like this Netflix push.

I would ask you does it replicate on Blu-Ray reference DYNAMIC material? If not then this is Puffery! Who cares what the Netflix static image is if in fact material you view throughout the day is uniform. Perhaps you have settings out of balance delivering less than peak brightness for the panels best uniformity edge to edge.

Another point is that the panels your comparing are BUDGET panels they are not top tier panels. The Vizio and the LG 42LD520 are Budget level panels - however recently I observed a new 32" Vizio VT320 LED that was outstanding - with pristine whites and nearly 3D look to the PQ that believe it or not had XBR level PQ.
post #3 of 25
Thread Starter 
Actually I do know the netflix screen is truly even across... I have had one Proscan model that had a awesome PQ and indeed the image was uniform white and red across. Also is pure and even on my 22 inch computer monitor when routed off the same PS3. Would someone so nit picky as I obviously am really make such a statement without reason to back it up and carefuly testing it? Highly doubtful... And you will note I didn't paint all panels as that way, I just asked if they were... either they are or I have really bad luck and that's what I am trying to figure out.

Also this effect is dramatically noticeable when running a PC input with full screen solid colors of any kind.

The effect is definnitely there during normal viewing, but like flashlighting or ghosting it's much harder to detect during normal viewinng. However when you know it's there, just like the other issues, it's distracting because every time a scene appears to have vinetting you have to wonder if it's really the TV or if the effect is artificially sterngthened by the TV.

The reason I ask if this is on all panels despite my only having used budget panels is that I have never seen this mentioned or pictured anywhere on any level panel and it seems like just the kind of thing people would happy note higher end panels don't have (similar to how dark room experience is a touted plus for even blacks on many panels).

I seem to have horribly bad luck... I have burned thorugh 6 LCD tvs in the last 3 months trying to get one that is satisfactory... 3 Proscans - all of which had legitimate problems like just powering off on their own, but one of hwich had an outstanding PQ and even lighting, just unfortunately started seemingly growing stuck pixels on a daily basis; and 2 Vizio's both of which had a humming form the speakers on all inputs unless on mute or 0 volume and now the LG.

Of all those TVs, only one Proscan (seemingly the cheapest choice) had an edge to edge uniform panel.

Now it seems I have horrible luck with TVs as evidenced by my trail of attempts so I was wondering if this is indeed normal or if I am somehow jinxed.

And yes I am pretty picky, but I also know I am in the budget market and that there is no such thing as a perfect panel so while I think I am putting my expectations above average joe schmoe out there, I don't think it's at all unreasonable and certainly there are more dificult to please members regularly on AVS.

And since I would think the same of someone who burned through 6 TVs, here is why I am not super picky, just bad luck: First proscan great IQ, grew stuck pixels fast. Replacement started turning off on it's own, had to unplug from wall before it would turn back on - IQ not as good as the first by a noteable amount. Replacement Panel was MASSIVELY flashlighty and cloudy and not even symetrical in this distortion. When watching any letterboxed movie much of the letterbox appeared almost white it was so flashlighted. Vizio - both exactly the same, buzz loud enough to hear from across the room in quite movie passes. Buzz went away if volume set to 0 or mute, however did not get proportionally louder with volume. Buzz was especially loud on Media input where there should be no sound at all (Again mute would kill it). This seemed to happen only when the panel was actually drawing an mage, for instance when on HDMI input, the buzz was minimal until a picture actually showed up, then it kicked in full force.

I think any of use would have returend over those issues.
post #4 of 25
None of my LCDs have ever done this. I've never owned budget models, myself. They've all been top tier, or middle tier.
post #5 of 25
Thread Starter 
Quote:
Originally Posted by MrEastSide View Post

None of my LCDs have ever done this. I've never owned budget models, myself. They've all been top tier, or middle tier.

Good to know, thanks for the input!


Can I ask, have you ever done anything where this would certainly show up (ie using as a computer monitor and looking at solid white) or just haven't noticed it per se?
post #6 of 25
Neither of my Samsung 650's do that either. Both have extremely uniform screens.
post #7 of 25
Thread Starter 
Seems I truly am super unlukcy then
post #8 of 25
The only time I had anything resembling that was a result of a dying bulb in my now gone Samsung 42" DLP set. There ere other symptoms, but a gradually growing vignetting was second only to the need to increase brightness levels as warnings of the need to order a bulb.

I don't know enough of LCD technology to say what yours might indicate but a careful reading in the tech focused threads here might well give you a clue. There are a lot of folks in here who have fine engineering level understanding of HTDV development and workings. I'm saying that you might be asking in the wrong place.

Good Luck!
post #9 of 25
Thread Starter 
Thanks for the followup... any specific threads you might be suggesting?

It sucks because I bought this at a Frys that is 80 miles away so I am kind of stuck with it...
post #10 of 25
The lower the price point of what seem like equivalent models the lower the qualtiy of the LCD panel within them. I am not surprisd that the 650 models do not have the problem that the 520 models.
As for cable if less about 15 feet any low priced High speed HDMI cable for about $15 from any of the cable vendors that sponser this forum will work just fine. And their longer cables are also just fine if you use the thicker(lower gauge) wire.
post #11 of 25
Quote:
Originally Posted by Devedander View Post

Seems I truly am super unlukcy then

You're not super unlucky. I bought a Samsung c650 which had this pretty bad (along with horrible banding.) That TV finally pushed me over the edge into a plasma. I'm done with LCD. My next tv will hopefully be a OLED
post #12 of 25
Quote:
Originally Posted by Devedander View Post

Thanks for the followup... any specific threads you might be suggesting?

Maybe this one: http://www.avsforum.com/avs-vb/forumdisplay.php?f=25 would be worth a try.

I developed a deep dislike for the return/repair departments of Fry's, both San Jose and the Campbell outlets when I was living out my career, so if nothing's changed much, I feel your pain.
post #13 of 25
Thread Starter 
Quote:
Originally Posted by MakoCSH View Post

You're not super unlucky. I bought a Samsung c650 which had this pretty bad (along with horrible banding.) That TV finally pushed me over the edge into a plasma. I'm done with LCD. My next tv will hopefully be a OLED

It's just that 4 out of 5 TVs I have tried had this and I have literally never heard it mentioned before... seems to be defying the odds on something or other.

Quote:
Originally Posted by krs View Post

Maybe this one: http://www.avsforum.com/avs-vb/forumdisplay.php?f=25 would be worth a try.

I developed a deep dislike for the return/repair departments of Fry's, both San Jose and the Campbell outlets when I was living out my career, so if nothing's changed much, I feel your pain.

Thanks, crossposted!
post #14 of 25
Thread Starter 
Took a gander around some stores today and finally found out BB has darkened their general TV area (not by much but much better than the super bright rooms other stores have) and I noticed that quite a few sets showed this darkening along the edges to some degree... I would guess roughly 1/3 but with the caveat of that being 1/3 of all the sets where 1/3 of the sets were probably plasma so no chance of this issue.

Both times I saw the 42LD520 it had the same issue and I noticed it on a few sets of most brands.

It was usually hard to see in the demos they have which involve a lot of bright fast moving colors, but Best Buy has an almost solid yellow splas screen every now and then that makes it pretty easy to spot.
post #15 of 25
Dot-by-Dot (or TrueScan) should be selected to minimize the effect; underscan (if available) could help as well. This would be masking rather than fixing the problem....
I bought 32ld560 for kids room - it has perfectly lit left/right edges (and truly outstanding picture for the price!)
My Sharp 77 series does not have this problem neither....

Boky
post #16 of 25
Thread Starter 
I keep mine set to "Just Scan" which I beleive is the 42ld520s version of pixel mapped.

From what everone else says about their screens (even budget ones), I am truly super unlucky as I am at about 85% hit rate with screens having this effect.
post #17 of 25
I just got an 42LD450 and it shows the exact same issue. It is severe enough that I can notice it whenever the image near the edge of the tv should be somewhat bright. An older Sanyo 37" doesn't have the issue, so I am seriously considering returning or exchanging the tv, especially if it isn't a common issue.
post #18 of 25
hey fellas, I had 2 Sharp quattrons in a row with this problem and returned them because of it. Mine had black edges on the left, right and even along the top of the tv horizontally..At times the black edges would even become thicker and go blurry/dance around a bit. I am really sad to hear that your LG has this because I am going to be looking to get a new LG 2011 model but a higher end model.. will definitely keep a close eye for this issue when I check them out in stores.

Here is a pic of what mine looked like on both sets of Sharp 40LE810UN
post #19 of 25
I decided to check out the 8500 LG today at Sears and best buy (they didn't have it) and was surprised to see so many tv's with this black edge issue.. I would say 8/10 would have this, with samsung least effected. Why the heck are they built like this with part of the picture cut off?
post #20 of 25
What is the source of the content you are sending to the TV and what interface are you using?
post #21 of 25
Quote:
Originally Posted by eneyman View Post

hey fellas, I had 2 Sharp quattrons in a row with this problem and returned them because of it. Mine had black edges on the left, right and even along the top of the tv horizontally..At times the black edges would even become thicker and go blurry/dance around a bit. I am really sad to hear that your LG has this because I am going to be looking to get a new LG 2011 model but a higher end model.. will definitely keep a close eye for this issue when I check them out in stores.

Here is a pic of what mine looked like on both sets of Sharp 40LE810UN

Thats (<-) not a problem and you can not see it from viewing distance.Do you want pictureinformation OUTSIDE the pictureframe?

Every TV has a few milimeters black on the edges,it can be thicker depends on content,there is no issue here.

post #22 of 25
^ after checking and seeing this on most sets I realize it is somewhat normal, but when I had it on my 2 Sharps, the edges would expand and go blurry and actually "dance" or wiggle around when content passed across it.. That was NOT normal

Also when it was just the black bars on the sides, it was absolutely noticeable from viewing distance and was a big distraction to see thick black bars on the sides and an uneven top of the television in the case of the Sharp 810's I had. I went to see many sets today and it wasn't as bad. In my case with the sets I had, the pixels would actually be distorted on the edges and top of the tv and would cause that area of the set to be fuzzy.

Higher end LG's had a smaller edge while Samsungs had a hardly noticeable one if not a perfectly filled screen.. so this can be avoided/reduced if the set is manufactured right.

I noticed HUGE black bars on the left and right with LG's low end models as well as many other sets such as Panasonic.
post #23 of 25
Again I ask what is the source of and input connector of your HD sources. If your are using a PC and a ATI graphcs card for it over DVI/ HDMI or conponent it's drivers will default to 15% underscan and you can get exactly the effect you are seing.
post #24 of 25
HDMI for HD receiver, HDMI for WD Media player, HDMI for PS3, Component for Xbox 360, the bars are there no matter what, it is a manufacturing defect and no way related to the signal, source, input or view mode.
post #25 of 25
Quote:
Originally Posted by eneyman View Post

HDMI for HD receiver, HDMI for WD Media player, HDMI for PS3, Component for Xbox 360, the bars are there no matter what, it is a manufacturing defect and no way related to the signal, source, input or view mode.

I don't think this is a LCD specific issue. Both my Sony 34XBR960 (HD CRT) and Mitsubishi WD-73C9 (DLP) exhibits this problem. But is it really a "problem"? Its only about 2-5 pixels of black on the screen periphery, and if you hadn't brought it to my attention, I wouldn't have ever noticed.

Quote:


I noticed HUGE black bars on the left and right with LG's low end models as well as many other sets such as Panasonic.

I have three LG LD450's (which I guess is the low end model) and the black border is definitely not "HUGE".
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