PowerBook G4 aluminum screen rendering problems

Hello. I use an old PowerBook G4 aluminum 15 " only for some older programs that I still have, the specs are 1.33 GHz, 1 GB DDR SDRAM, an A1095 model (I think). It is currently running OS 10.4.11 Tiger.

I am having some problems with the rendering of images, windows and icons on the screen. Sometimes, say if there is a background image, there will be pixels of a pure purple and light green color and other parts of these colors in pants plates, which will fade in-and-out in intensity. There will be a purple halo around the icons on the desktop, windows will have their underlined by violet title bar and the window itself will be celebrating also in purple. When I move these icons and windows, the outline of color moves with him - even for images with these pants patches. If I try to take a screenshot, it looks like it has taken to this effect, but when the screen goes back to normal, the images do not show fading.

There is also a kind of shear horizontal wind that comes and goes, like a Photoshop effect, which seems to affect the whole screen - but it was did not so lately, moreso just the pants colors. The effect of shear wind or rosacea are affected by the position of the screen.

These are intermittent problems that come and go, sometimes they may not arrive for a few hours or a few days, and sometimes they keep coming back and to stay - they also vary in intensity, sometimes just annoying, other times made the screen so bad that I have to do a hard shutdown with the power button.

I have connected this laptop to a LED TV (via a HDMI DVI cable) when I had these patches scrambled on the computer laptop screen - and the TV screen shows very well, without tasks.

After asking some Apple technicians, they thought it could be anything from:

-l' screen is gone - but why would move fading when I move the images/icons/windows?

-a bad laptop screen cable

-video card - but she restores the fine screen image when connected to a TV?

-memory on the logic board

-poorly seated RAM (which I've deleted and reinstalled several times with the same results)

Or a combination of these. They say this isn't a problem with HD.

I understand that it is an old computer and an old technology, but I would still go back to normal, as everything else works fine. I know a guy who can replace the screen and the cable, as it seems a little tricky for me to do would not touch the video card. I'm wary about this fact, because it may be other things that causes this problem.

In addition, the graphics card is an ATI Mobility Radeon 9700, model: ATY, RV360M11 - if it helps.

Any ideas - thanks. (Please keep it relatively simple, if possible)

As the connected HDTV does not have this effect, the problem is likely related to the PowerBook's display hardware.  If the problem was related to the graphics card (and 'upstream' material) or due to a software problem, waiting for HDTV to show the same effect at a time when the PowerBook display is the effect.

You can try to do a reset PMU (power management)

Resetting PowerBook and iBook Power Management Unit (PMU) - Apple Support

and that he may as well do a LANDAU ('NVRAM') reset too (although less likely to cause described problem)

How to reset the NVRAM on your Mac - Apple Support

Tags: Notebooks

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