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Arths

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  1. Arths

    Apple IIc blinking power light

    Absolutely, but that did not change anything
  2. Arths

    Apple IIc blinking power light

    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 ?
  3. Arths

    Apple IIc blinking power light

    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
  4. Arths

    Apple IIc blinking power light

    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
  5. Arths

    Apple IIc blinking power light

    Might be a possibility, RAM chip are MT4264 right ? I've read online that I can also use 4164 chips.
  6. Arths

    Apple IIc blinking power light

    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
  7. Arths

    Apple IIc blinking power light

    Ok, RalfK from Apple Fritter asked me to test FFF and all I get is zero
  8. Arths

    Apple IIc blinking power light

    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
  9. Arths

    Apple IIc blinking power light

    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 ?
  10. Arths

    Apple IIc blinking power light

    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
  11. Arths

    Macintosh SE FDHD

    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 ?
  12. Arths

    Macintosh SE FDHD

    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 main issue. You can find a picture of the logic board attached so maybe you can help me out. Do you think this board is toasted ? Thanks a lot, Arths PS : Believe it or not but the original hard drive started to spin again and loaded System 7, what a joke !
  13. Arths

    Apple IIc blinking power light

    I’ve replaced this one too..
  14. Arths

    Apple IIc blinking power light

    Well, I’ve replaced the internal power supply as well.. same problem. I guess the computer is dead
  15. Arths

    iBook G3 2001

    Nevermind, installed a Netboot server on my G4 MDD and currently installing Tiger through Ethernet Sorry for the double post.
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