David Cook's latest activity
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Here are the IDs (see U13H): Backlit portable: $A5 10100101 Upgraded original portable: $A3 10100011 PowerBook 100: $AD 10101101 -
David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.They're outputs, so they could just be floating. Thanks for letting me know. If I get a chance, I'll also take a look. It wouldn't...
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.I had no idea that the "backlight id" and "backlight brightness register" were implemented in such a rudimentary manner. There are 5...
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David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Incredible write up! It explains so much. Based on your schematic, the digital potentiometer chip (U14G) is actually being used as a...
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David Cook replied to the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver.Not certain. But, I agree with you that noise can be a showstopper. For example, all of my recent PCs have beQuiet cases and fans.
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David Cook replied to the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver.I just tried it. I drowned the coil in superglue and let it sit for an hour. It is dry to the touch. Unfortunately, the coil whine is...
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David Cook replied to the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver.One more thing... Here is JDW's video on how the Portable screen casing comes off / goes together. About 15 minutes 50 seconds into the...
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David Cook replied to the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver.Some updates: 1. To see what I mean about the screen being nicely bright even with the slider quite low, look at the final picture of...
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David Cook replied to the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver.I just tested the current usage. I disconnected one of the wires going to the LED strip itself and inserted my multimeter in amp mode...
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David Cook replied to the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver.Correct. For the first item, I've ordered a couple of other small step-up converters to test. There is one other possible negative...
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David Cook posted the thread Portable CCFL Backlight Replacement with Off-the-shelf LED Strip Driver in Macintosh Portable.I bought a backlit Macintosh Portable (M5126) that needed a recap and minor cleanup. Upon powering up, everything initially worked...
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David Cook replied to the thread Mac II Video glitch.If you post a copy of your drive image (whatever is the smallest that exhibits the symptoms), I'll try it on my Toby card and Mac II.
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David Cook replied to the thread Mac II Video glitch.I'm not giving up on this. I swear I've seen it before. Based on Apple's ROM code, highlighting was really tricky and there were a lot...
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David Cook replied to the thread Mac II Video glitch.Did you use the same disk image on the II as the IIci? Just to rule out a software / OS issue. Can you describe this further? Is this...
