I've got my 40" lcd!!!! (1080p!!)

[py3m4n]

Re: I've got my 40" lcd!!!! (1080p!!)

Sounds to me like you have got your new toy up and running and you are being picky, hahahahaha.

Sounds like a backlight uniformity issue, something that just exists with LCD technology, part of the reason manufacturers moved on to LED technology, that, and they want you to buy the next big thing! If your being picky you can almost always find this on a dark screen on LCD's (any I have put under scrutiny anyway, in particular I have found it more prominent in Samsung LCD's)

Stop looking for issues, be proud and enjoy 2001! hahahahaha!!

[tom66]

Re: I've got my 40" lcd!!!! (1080p!!)

To fix the light area, loosen the case screws. (Just a little bit... still plenty to hold the TV together, but not maximum torque.)

Seriously, it fixed it on a Toshiba LCD I have. Dark patch in the centre of the screen caused by screws that were too tight, applying too much pressure to the LCD panel.

The technical term for it is mura, and it is caused by unevenness of the liquid crystal in the LCD panel. Whilst it is a permanent defect, it is made much worse by the case design.

I bet you've got a Chi-Mei LCD panel, those are rubbish and very prone to mura.

[Paul678]

Re: I've got my 40" lcd!!!! (1080p!!)

To fix the light area, loosen the case screws. (Just a little bit... still plenty to hold the TV together, but not maximum torque.)

Seriously, it fixed it on a Toshiba LCD I have. Dark patch in the centre of the screen caused by screws that were too tight, applying too much pressure to the LCD panel.

The technical term for it is mura, and it is caused by unevenness of the liquid crystal in the LCD panel. Whilst it is a permanent defect, it is made much worse by the case design.

I bet you've got a Chi-Mei LCD panel, those are rubbish and very prone to mura.

I loosened the case screw in that corner, but
didn't really do anything. But it DOES look like
some sort of pressure is being applied to that
corner. You know how you can make an LCD
panel brighter by pushing your finger on it? Looks
like the front plastic bezel may be putting some
pressure on this corner.

You can only barely see it when the screen is pitch
black, and that's only if you are looking for it.
Most of the time you cannot see it.

Py3, you are correct! I'm being WAY too picky!

The picture is beautiful! This website is the
coolest! Thanks for all the input!

[py3m4n]

Re: I've got my 40" lcd!!!! (1080p!!)

What's your backlight settings at? have you tried just turning it down a bit to see if it makes a difference?

Your right about this site. After what Tom has just said about mura I am reckoning that's whats up with a friends T.V and it's not a backilght uniformity issue like I had presumed. It is more likely thermal stress over the years on the LCD panel itself (his telly is around 5/6 years old and well used).

[tom66]

Re: I've got my 40" lcd!!!! (1080p!!)

I loosened the case screw in that corner, but
didn't really do anything. But it DOES look like
some sort of pressure is being applied to that
corner. You know how you can make an LCD
panel brighter by pushing your finger on it? Looks
like the front plastic bezel may be putting some
pressure on this corner.

You can only barely see it when the screen is pitch
black, and that's only if you are looking for it.
Most of the time you cannot see it.

Py3, you are correct! I'm being WAY too picky!

The picture is beautiful! This website is the
coolest! Thanks for all the input!

*All* of the screws, not just the one on that corner. The problem on the Toshiba was on the centre, but more on one side. Would recommend doing them all, that fixed it.

[tom66]

Re: I've got my 40" lcd!!!! (1080p!!)

Your right about this site. After what Tom has just said about mura I am reckoning that's whats up with a friends T.V and it's not a backilght uniformity issue like I had presumed. It is more likely thermal stress over the years on the LCD panel itself (his telly is around 5/6 years old and well used).

I think backlight uniformity is considered the same as mura, but caused by the filter layers in the backlight system distorting. It is definitely accelerated by thermal stress, like normal LCD mura. It may be repairable, but the filter layers are probably next to impossible to buy in low quantities. I tore apart a Philips LCD TV with a broken screen. There were about 6 diffusers(!) and a prism film. A prism film is a really cool piece of material. If you shine a light through it, it makes it appear brighter. How does it do it? It makes the light more perpendicular, i.e. directional, going one way not various different ways. Easily brightens the screen by 15-20%... now that's simple and clever design.

[py3m4n]

Re: I've got my 40" lcd!!!! (1080p!!)

@Tom

If your interested, done one a bit of research on the differences between the picture on Xbox 360 when comparing component and HDMI. Looks like it might be down to the way that the Xbox's circuitry processes the analogue to digital conversions (i think that's right,lol) which is not very well by the sounds of it. I think further reading is required for me to fully grasp it...

[Paul678]

Re: I've got my 40" lcd!!!! (1080p!!)

*All* of the screws, not just the one on that corner. The problem on the Toshiba was on the centre, but more on one side. Would recommend doing them all, that fixed it.

Ok, a bit more nit-picking: The big "Journey" letters
from the Journey DVD menu, along with the box surrounding
the over-the-air TV channel display, appeared to be very
faintly burned into the screen image during the first 15 minutes
or so. The very faint burn-in was not noticeable when the background
was either very dark or very bright.

They appear to be gone now, but is this normal
to see on LCD while the tv is warming up?

[tom66]

Re: I've got my 40" lcd!!!! (1080p!!)

Ok, a bit more nit-picking: The big "Journey" letters
from the Journey DVD menu, along with the box surrounding
the over-the-air TV channel display, appeared to be very
faintly burned into the screen image during the first 15 minutes
or so. The very faint burn-in was not noticeable when the background
was either very dark or very bright.

They appear to be gone now, but is this normal
to see on LCD while the tv is warming up?

That is typical for most LCDs. They exhibit temporary image retention. Mine does it if you have an image on it for more than about 20-30 seconds.

[Paul678]

Re: I've got my 40" lcd!!!! (1080p!!)

That is typical for most LCDs. They exhibit temporary image retention. Mine does it if you have an image on it for more than about 20-30 seconds.

Ok, good to know. It's very hard to notice
at first, and you really have to look for it, and even
then, it disappears completely most of the time,
depending on what the displayed picture is.

OVERALL IT'S FANTASTIC! I love the picture! It's obviously a lot
nicer than my 2004 Insignia NS-32LCD, which I'm now
trying to sell. This Proscan is a 2009 model, so it shows you
how far they progressed in 5 years, particularly with respect
to the wider viewing angle (blacks on the Insignia get pretty
grey if you aren't facing straight into the screen).

Ok, I'm ready for another one! haha!

Thanks for all the feedback, guys.....

[py3m4n]

Re: I've got my 40" lcd!!!! (1080p!!)

Ok, I'm ready for another one! haha.

He has been bit!

[Scenic]

Re: I've got my 40" lcd!!!! (1080p!!)

If you REALLY want to get a "wow" effect, download Big Buck Bunny in 1920x1080, connect your computer up to the TV (via VGA or whatever) and watch it

I know that feeling.. We had a 9 or 10 years old 70cm (28") 4:3 CRT TV (Vestel turk crap chassis.. i think 11AK33) up till about 3 months ago, when the main filter cap (400V 150uF G-Luxon from 2000) randomly decided to go pop violently (whole can was egg-shaped), and somehow killed half the SMPS in the process.

Put a little (i think 20") CRT TV up temporarily.. anything but ideal for a big living room lol.

Fast forward a bit, and now we're watching TV on a 40" 1080p Samsung LE40A536 that I managed to fix after LOTS of frustration (ended up being a bad mainboard).

There just isn't any comparison. SD TV looks like shit (blurry pixelated mess cause it gets upscaled), but feed it 720p or 1080p material and it looks awesome

edit: yes... it was LOUD
http://bambooz.pytalhost.net/badcaps/vestel-11ak33.jpg

[tom66]

Re: I've got my 40" lcd!!!! (1080p!!)

If you REALLY want to get a "wow" effect, download Big Buck Bunny in 1920x1080, connect your computer up to the TV (via VGA or whatever) and watch it

I know that feeling.. We had a 9 or 10 years old 70cm (28") 4:3 CRT TV (Vestel turk crap chassis.. i think 11AK33) up till about 3 months ago, when the main filter cap (400V 150uF G-Luxon from 2000) randomly decided to go pop violently (whole can was egg-shaped), and somehow killed half the SMPS in the process.

Put a little (i think 20") CRT TV up temporarily.. anything but ideal for a big living room lol.

Fast forward a bit, and now we're watching TV on a 40" 1080p Samsung LE40A536 that I managed to fix after LOTS of frustration (ended up being a bad mainboard).

There just isn't any comparison. SD TV looks like shit (blurry pixelated mess cause it gets upscaled), but feed it 720p or 1080p material and it looks awesome

edit: yes... it was LOUD
http://bambooz.pytalhost.net/badcaps/vestel-11ak33.jpg

Hah. That looks bad. Interestingly the service manual says 330u 400V is to be used. I'm guessing they made the cap smaller till it stopped working (at least for a couple of minutes), classic Vestel design procedure it seems!

[Scenic]

Re: I've got my 40" lcd!!!! (1080p!!)

Well.. it worked for 10 years. And we got it used, so idk how old it actually is.

It's rebranded as a Universum FT 81026 (1, 2)

The chassis is an 11AK33-1 actually. No idea if that makes any difference.
In the whole time since we got it, it only had 2 repairs done to it.
One was failed solder joints in the HV area under the chassis (image became blurry every now and then). Fixed with LOTS if leaded solder (resoldered just about every joint that looked even slightly abnormal)
The other one was a randomly shorted bridge rectifier, which ironically blew the little fuse in the power strip it was plugged into, but not the one in the TV itself

Otherwise nothing done to it. Ever. Quite suprising for a POS Vestel.
I was hoping to fix it up again after the LCD TV turned out to be a nightmare.. replaced a bunch of components in the SMPS area and a bunch of caps all over the place (it had developed an issue with random characters in the teletext being either wrong or just blank.. with sometimes quite hilarious results).. But I never ended up testing it after that and kinda forgot which connector goes where by now (it's been sitting for 3 or so months now).

I'm quite undecided wether I should dump it or try to get it working to have my own TV. I actually don't have one since '04.. was fed up with the 24/7 BS.. Nowadays it might come in handy for my various analog video stuff I'm trying to transfer to digital formats and also some retro-consoles, which don't really work too well with LCDs (input lag, format/aspect problems)

[/StoryNoOneCaresAbout]