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| Powerbook 150 - screen is blank |
Posted by: insaneboy on 2012-08-20 17:46:18
I'm just giving up on the POS 150 I got, I'd still like to get one some day, a much nicer one though. for the IDE drive and 40MB RAM capacity. For now I'll stick with the 180.
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Posted by: joe4227@sympatico.ca on 2012-08-21 21:19:53
Some progress!
Apple Developer technote for this machine contains block diagram and describes *some* of the hardware. Found here:
http://developer.apple.com/legacy/mac/library/#documentation/Hardware/hardware2.html
It tells us that "The Display is a 9.5-inch flat panel film super twist nematic (FSTN)
dual-scan liquid crystal display (LCD). It provides 640-by-480 2-bit per pixel resolution, is
capable of displaying 4 levels of gray, and has on-demand cold cathode fluorescent lamp
(CCFL) backlighting.
The video implementation on the PowerBook 150 is similar to the video on the
PowerBook Duo 230. The video RAM is a 128K x 8-bit device that stores the data required
to update and refresh the flat-panel video display. The VRAM for the PowerBook 150 is
mapped to locations $6000 0000 through $6080 0000, as it is on
the PowerBook Duo family. The display hardware supports 1-bit and 2-bit per-pixel
grayscale. The value for the PowerBook 150 panel ID is 4."
More importantly, I learned that the "GSC" chip stands for Grey Scale Controller and is actually a Chips and Technology Video Controller chip. In most cases, I think they used the 65525, but I will confirm from the hardware. If that is the case, I have the Application notes with pinouts for that chip, which will tell me the pinouts on the LCD ribbon...
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Posted by: joe4227@sympatico.ca on 2012-08-21 21:28:45
It's not. The GSC in the 150 is a CT65210A. So now to find the sheets for that!
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Posted by: joe4227@sympatico.ca on 2012-08-21 23:58:14
Np joy!
I cannot find the app notes for the CHIPS & Technology F65210A. They got bought by Intel, later divested to Asiliant, after that, who knows. The parts are still around, but try to find the specs/notes!
Also no joy finding specs or pinouts for the Casio/ACER MD800TT10-C1...
If anyone else has these, please let me know!
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Posted by: joe4227@sympatico.ca on 2012-08-22 01:24:08
The ribbon cable has 15 connections between the GSC and the Display.
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Posted by: joe4227@sympatico.ca on 2013-02-01 20:18:51
Just getting back to this. I guess I will need to get the 'scope out of storage, and will definitely consider re-capping the display.
Just hope that it doesn't turn out to be the Grey-Scale chip. I guess the scope will tell us whether the signals are on the ribbon or not.
Still looking for specs on that GS Controller, if anyone has found them...
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Posted by: beachycove on 2013-02-01 20:44:32
Got anything to trade for a working 150? I'm not all that far down the 401.
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