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PowerBook Pismo Display - yellowish

If the tint of yellow is uniform across the screen you might want to use some sort of calibration tool, there is one built into OS X for sure if that is what you are using. I had to look this up but on OS 9 search for "ColorSync Monitor Calibration Assistant"

If you provide more details about the OS we might be able to provide more help but without replacing the LCD your best bet is to turn down red and green or bump up the blue. Essentially if you use calibration built into the OS you will want to neutralize, use grey as a background desktop color while you adjust, this should help your eye pick up whether the grey is perceived as neutral.

Using the Display Calibrator Assistant in Mac OS X:

 
From the Apple menu, choose System Preferences.
  1. Click Displays.
  2. Click the Color tab.
  3. Click the Calibrate button.
  4. Click on the Expert Mode checkbox.
  5. Follow the instructions, and save the custom profile when finished.
For OS 9, maybe these help as well.

ColorSync 2.6.1 Document and Software.pdf

Apple Displays Software 1.7.1 Document and Software.pdf

Kind regards

—Alex

 

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This is probably caused by an aging CCFL backlight. I don't know the proces for this particular machine, but replacing the CCFL lights or retrofitting the machine with LED back-lighting should address this issue.

It's pretty common for LCD displays using CCFLs to yellow as they age in this fashion, and I have some other mid-2000s systems that have the same thing happening. By the time you notice, it's probably too severe to correct it out using a calibration tool, but I'd be interested in hearing what happens if it's tried.

 
Cory5412 said:
By the time you notice, it's probably too severe to correct it out using a calibration tool, but I'd be interested in hearing what happens if it's tried.
Click to expand...
This may be the case but it would be good if the original poster provided more information but if the yellowing is only slight calibration software could help but the results will certainly mean a darker screen. It would be nice to know where to get compatible parts.

 
Thickness between replacement bulbs and OEM can be different. The plastic frames might be cracked from age, getting the sheets back 100% correct without any dust can be a problem. Most of the ones I dealt with were from Thinkpads. Could just be me.

Old bulbs yellow and then turn redish before they fail. I do have some laptops with redish bulbs that still work fine years later (red clears up after a few seconds).

 
Also the yellowing display could be caused by the plastic/paper backing layer itself yellowing (I had a similar issue on a ThinkPad 380Z and various other machines), maybe take the panel out physically and see if there is any visible yellowing to any layers or the backing

 
danikayser84 said:
Also the yellowing display could be caused by the plastic/paper backing layer itself yellowing (I had a similar issue on a ThinkPad 380Z and various other machines), maybe take the panel out physically and see if there is any visible yellowing to any layers or the backing
Click to expand...
Interesting, how would that backing layer yellow? Can it be reversed or de-yellowed? 

 
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