Re: TiBook display crisis

Mon, 27 Sep 2004 21:36:57 -0700

The briefly flashing screen, hissing sound, and uneven illumination suggests that your problem is with the inverter circuitry that drives the LCD backlight. If the other suggestions don't work out, replacing the inverter board might work ($84.50 at http://www.wegenermedia.com/titp.htm). Although the inverter is located under the optical drive in your model of PowerBook, cleaning fluid could have shorted the backlight connector.

Hope this helps.
-ben

On 28 Sep 2004, at 02:55, gianfranco sciacca wrote:

hello folks,

I've cleaned some hours the display of my 1GHz TiBook with a spray product and a microfibre cloth. All was well, I booted it up as usual, then logged on. But only in a matter of minutes the screen went dark. It wasn't sleeping, the screen went to the lowest level of luminosity (when the screen picture is only barely visible), although the luminosity setting was still max (one can still see the settings, while adjusting the luminosity). I then restarted the machine a few times (also reset PMU) and the symptoms are as follows:

after powering up, the boot procedure is normal. The screen flashes to normal luminosity only for a fraction of a second right before the apple appears at screen centre (I believe this is when the screen if first powered at booting time). Simultaneously to the flashing, a noise is heard, sort of white noise, apparently coming from the area where the Power board is. The flashing is usually very brief, only once was lasting a whole second or so.

The other thing I just noticed is that when opening the lid after having slept the computer, some light comes to illuminate the screen for a second or so, higher (but not full) intensity at the bottom/right side (where the video cables are fed through), fading to dark towards the left.

The product I have used for cleaning is a spray suitable for TFT display, but I was told it is fine also for notebooks (there's also a notebook picture on the bottle). What have I done there? Perhaps some drops have penetrated somehow in the machine? Or have I damaged the LCD for good? Any hope to recover this beast, or idea of what to look at? I never had any display issues in the past on this machine.

thanks in advance for any precious suggestion. cheers, gianfranco


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