
Arths
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Absolutely, but that did not change anything
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I’ve changed chip F18 and I now have solid horizontal white bars. Another thing is that I seem to loose composite signal every 2 seconds, maybe a clock issue ?
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Hi guys, Just received the chips, tried piggybacking but that doesn’t seem to change anything. Maybe there are specific chips I shall try this method on ? If you have any idea, please let me know Thanks Edit : Piggybacking F18 makes horizontal white bars but that's it Arths
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Mine uses TMS4164, must be an early revision of the IIc. According to this site, they should be compatible anyway. Ordered five chips from AliExpress, they should arrive in 2 to 3 weeks. Thanks for your advice
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Might be a possibility, RAM chip are MT4264 right ? I've read online that I can also use 4164 chips.
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Hey guys, Turns out it was the LM311N chip which was causing the blinking power light. Soldered a new one and blinking is gone but it still doesn't want to boot. Hooked the IIc using the composite output and here is what I get.. Sometimes I get scrolling characters instead like so Holding CONTROL-RESET makes the scrolling stop so I guess the CPU at least understands the keypresses. Any idea ? Thanks, Arths
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Ok, RalfK from Apple Fritter asked me to test FFF and all I get is zero
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Here are my results Capacitors C57 shows zero C44 and C43 shows infinite when speaker is unplugged, .845 when it is Rails Thanks a lot
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Arths started following Macintosh SE FDHD and Apple IIc blinking power light
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Thanks for your reply, I will try that as soon as I get home Already measured the 7905 chip and I’m getting voltage in expected ranges, is it a good sign ?
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Sorry for the late response Yes I’ve tested without a disk drive and it still won’t boot. What should I check first ? Is there a place on the board where I can check that the voltages are the ones I shall receive ? Thanks for your patience
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Just tested the ADB ports while the computer is turned on, I get +5V for both. The Dead Mac Scrolls indicates that it might be the Tokin filter, tested it as well, pins (1-8, 2-7..) show 0V which should be correct ? I really don't understand why is the ADB not working. Plugging a keyboard makes its lights turn on but that's it. Any help ?
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Hey guys, Quite a time wrap from 2012 isn’t it ? I got my Macintosh SE FDHD back from storage. I really think that the screen glitches and Sad Macs I have from time to time might be caused by the Power Supply. As of now, I am getting the right voltages from the floppy disk port (+5V and +12V) but the machine is running great so far. I’ll re-measure when it will start acting weird again. I’ve tried to clean the rusty parts with vinegar and it seems the logic board is not as badly damaged as I thought. ADB ports are still not working and that’s the mai
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I’ve replaced this one too..
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Well, I’ve replaced the internal power supply as well.. same problem. I guess the computer is dead
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Nevermind, installed a Netboot server on my G4 MDD and currently installing Tiger through Ethernet Sorry for the double post.