My 4th 9300 screen. What a surprise... - Page 3

Its acutally the camera. My gf had gave it some funky settings and I have no idea what she was trying to do. The ISO was set to 50, no autofocusing or flash and some other stuff too.... I will take a picture of it tomorrow with everything set to auto.

OK, can I toss out a ring here?

I didn't think it was the inverter heat because I've taken old lappies apart and played with the components, and the inverter is usually stuffed into one side or the other allong the bottom.
The photos show a consistancy all the way across.

The aluminum tape, I don't believe, has anything to do with heat.

This is the thing; I really don't understand about flourescent bulbs and how they work. But I have about four from old lappies, and I was futzing around with one last week. I figured I'd make a little flourescent light that clips on the top of the screen and plugs into the 5V USB port for illuminating the keyboard in the dark.
-Ya know, just playin around.

I was testing the light (10 inches X 1/4 inch diameter) along with the inverter to see what the minimum voltage it would respond to was to see if the USB might be able to power it. When I applied a 9 volt battery to one part of the inverter, I picked up the lamp with the other hand by the glass, and IT LIT UP!

It was probably near the 75% brightness mark. Closing the circuit with the battery on the metal endcap lit it up brightly, of course.
I also gave myself quite a jolt from the inverter/capacitor.

I suggest that the aluminum is for grounding, and that the light seepage is the result of too puny a ground for the extra electrons being tossed out by the static field of the lamp. (Yes, I addmit I'm talking out my ass here, but...).

Now, who wants to test my theory by hooking up a fat copper wire from their aluminum sheilding to their wrist?

I don't have much light leakage on mine, so I can't be a guinea pig, but here are some data points for you:

1) Just about everybody with light leakage complains about leakage along the lower edge of the panel.

2) Both the inverter and the backlight lamp are located along the bottom edge.

3) Tallman said he sprayed compressed air near the inverter to cool it down, and the leakage went away.

4) Others say the leakage goes away if they drop the backlight level down a setting, which might cool things down (but it might also just make the problem less noticable).

5) The LCD is grounded to the Mg-alloy lid.

6) Liquid crystals are very sensitive to heat. Remember the mood ring?

So, I'm not sure I buy your electron bombardment theory I'm still waiting for somebody with bad light leakage to put their laptop in the fridge to see if the problem goes away.

Hmmm.
Can the bezel be removed to release heat while the screen is still attached & functional?

Meanwhile, I have a few old lappies. I'll subject one to some localized heat with a hairdryer and post my findings tonight.

IIRC, todays screens have the transistors directly behind each pixel, whereas the one in my old Gateway is likely to have the transistors mapped, with half at the top and half at the bottom.

Could the alleged static field be messing with these transistors?

[IMG]dsc00466[/IMG] this is my s-sung sec5557

ok how do you put a image on screen .....

The heat from the backlight is definitely what's causing the severe leakage on the bottom of the screens. I took the aluminum heat spreader off of a Samsung and used xtremely wide thin copper to spread the heat. Almost all of the leakage on the lower bottom of the screen disappeared, even with laptop on for hours. The screen was also cooler to the touch at the bottom.

Note, it did not appear the stock aluminum spreader was touching anything else, even when the back lid when put together, so it seems not to be a ground. Also, having just the bezel removed will not make a difference.

Amazing.. now can we have some electrical / electronic and computer engineering people here devise a simple ground MOD for this?

I have friends working in the EE, CE side of companies such as: Intel, Dell, HP etc. But I'd have to ask them the right Questions to get any 'correct' answers.. i.e. If someone can figure out how and why.. I can present the problem to them and get some kind of applicable solution that we should be able to implement as a MOD.

I just got my 9300. I love the laptop, but I got a really crappy screen. I have light leakage at the top, bottom, sides, you name it... Also has dark or bright corners! WTF?

Pics:



Picture quality isn't the greatest, but it gives you an idea of what I'm seeing. I will send this laptop back later this week.

Please don’t be offended, but to me these photos simply suggest a wrong setting of the backlight intensity. You cannot crank the brightness all the way up- a setting intended for use in bright outdoor surroundings, say- when using it in a low-light indoor situation! Just use Fn+Arrow down keys to get the black background look black and the bright parts look normal bright (like the white of a white paper in a room lit by daylight, rather than the radiating little sun of the XP logo in your photos). Use the NVIDIA brightness and contrast sliders to do finer adjustments, needless to say.
I do not know about you, of course, but I suspect that a vast number of people have their habits from working with CRT’s. An LCD is a very different animal, and it is wrong to force it to the kind of intense, larger-than-life-brightness that most people use on their CRT’s and TV sets.
Espescially the screen in the last photo looks like a very good one to me. By normal, considerate use you will probably notice nothing wrong, and I would be surpriced if you found anything better.

This notebook is a quiet sensation.

Streng, don't assume that chandra has the brightness all the way up on that pic. The bright logo is the result of the camera exposure, perhaps.

Let's face it, these screens are simply not top quality. I'm working on a 2-yr old 1702FP 17" flat panel LCD that came with a desktop Dell, and it's a lovely screen with no problems like this at all. Go figure!

Hm yes, I also at first thought it was the camera exposure. But then both say that it looks like this, more or less.

(I agree that there are better screens, but there are also worse. My own, a WXGA Samsung, has little or no ghosting, rather natural colors and no stuck pixels. The lower right corner is somewhat darker than the rest, when i look at a one-color background, but I do not notice this in daily use).

I agree with Streng, my 9300 has the Samsung screen and the 'light leakage' is about the same as the original pic for this thread. I just turned down my brightness until it was more black and its all good, no complaints and im certainly not going to ask for a replacement.

yep it's bullshit

Truedat

My screen has more than light leakage. It has dark spots at certain areas and two of the corners are really bright compared to th rest of the screen.

Edit:
My brightness level is 4. That's half brightness!

Tallman, does this mean that you can fix this bottom leakage problem? If yes, you're the man! Kudos to you. Share us more details about your mod. Some pictures are welcome.

When you get tired of these crap screens, go to www.ibuypower.com and look at their lappies. They look like better deals than Dells, and they use cool-running 64-bit Athlon processors too.

Ive had my 9300 for about six weeks now and my samsung screen initially looked alot like chandras, I stuck wtih it for the great viewing angles and good colors, sharp screen, samsung wxga model x4766. Light leakage is all but gone now, very happy with my panel