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Apple Computing Products:
macOS - Notebook Hardware
12" Powerbook won't detect replacement LCD
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<blockquote data-quote="tonyhill" data-source="post: 199141"><p>Okay. So, I looked at MacOSXHints. No help with my problem. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p></p><p>As I've been working through this, I've noticed that not even OpenFirmware recognizes the screen, and that is the biggest problem. The display is not even addressable by the graphics card (under any OS) if OpenFirmware doesn't see it. (you can get at this in OpenFirmware by typing 'dev / ls'. Once you find the Display devices, you can find out stuff about them by typing 'dev <whatever the path is>' and then '.properties')</p><p></p><p>As I study the LCDs, I see that rev B2 was produced in 2001, while the C2 is a few years later. Do you think it is possible that the protocol by which the LCD reports its display characteristics changed between revisions?</p><p></p><p>At any rate, I'm now focusing my efforts on a hardware solution rather than software, since that is the only way I've gotten this to work. I've contemplated a 20-pin switch to allow me to automatically switch between connected displays, but I think there's a more elegant solution.</p><p></p><p>I'm pretty sure that the conncection is based on the DFP connector, with the 20 pins side by side, rather than in a D-type plug. According to DFP, two of the 20 pins are responsible for exchanging information between the display and the video card. So, my plan is now to confirm that and then wire a plug that re-routes the neccessary pins to the old LCD panel to it can tell the video card (and OpenFirmware) how to drive the new panel.</p><p></p><p>Kinda messy, but it seems the only affordable option left to me.</p></blockquote><p></p>
[QUOTE="tonyhill, post: 199141"] Okay. So, I looked at MacOSXHints. No help with my problem. :( As I've been working through this, I've noticed that not even OpenFirmware recognizes the screen, and that is the biggest problem. The display is not even addressable by the graphics card (under any OS) if OpenFirmware doesn't see it. (you can get at this in OpenFirmware by typing 'dev / ls'. Once you find the Display devices, you can find out stuff about them by typing 'dev <whatever the path is>' and then '.properties') As I study the LCDs, I see that rev B2 was produced in 2001, while the C2 is a few years later. Do you think it is possible that the protocol by which the LCD reports its display characteristics changed between revisions? At any rate, I'm now focusing my efforts on a hardware solution rather than software, since that is the only way I've gotten this to work. I've contemplated a 20-pin switch to allow me to automatically switch between connected displays, but I think there's a more elegant solution. I'm pretty sure that the conncection is based on the DFP connector, with the 20 pins side by side, rather than in a D-type plug. According to DFP, two of the 20 pins are responsible for exchanging information between the display and the video card. So, my plan is now to confirm that and then wire a plug that re-routes the neccessary pins to the old LCD panel to it can tell the video card (and OpenFirmware) how to drive the new panel. Kinda messy, but it seems the only affordable option left to me. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
12" Powerbook won't detect replacement LCD
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