David Cook's latest activity
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.Attached is Apple's Color Classic schematic. See page 12 for the connector pinouts. We assume the LC 520 pinouts are the same, even if... -
David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.We are making progress. We have seen a number of things that are working. The fact that audio worked and the CRT worked briefly means...
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.One more thing when you get home from work. Confirm that you hear a sound from the floppy drive during test step 5 SWIM test.
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.I got my reproduction TechStep from @max1zzz during the following thread...
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.What have we learned? Your CPU is working. Your ROMs are good (checksum passed). Your bus is working (memory and ROM tests). Your CUDA...
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.I am testing my LC 520 board in my Color Classic using the reproduction TechStep. ADB mode works for me. 1. Mac power switch off. 2...
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.By the way, have you plugged headphones into the jack to see if the bong is playing through there?
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.Absolutely fascinating @JDW! This is good news. The TechStep results indicate most of the board is confirmed working. I wonder whether...
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David Cook replied to the thread Macintosh Slice - a Pre-release Color Classic.A different Color Classic came with its instruction manual. It includes a brief insert that calls out the power-up sequence. There must...
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David Cook replied to the thread Fixing a Macintosh Portable - What worked for me.I just repaired another Portable that was crashing when sound played. I decided to put this board in my ultrasonic cleaner. Afterwards...
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.It might just be a bad joint (your solder joints seem good). I've had capacitor gunk get under a leg and eventually disconnect when...
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David Cook replied to the thread LC575 computer killed LC520 motherboard! 😭.I agree with @Fizzbinn that it is more likely that something simple went wrong with the board in storage (or when being jostled during...
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