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techknight

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  1. techknight

    Notice to Powerbook Duo Users!

    DC-DC converters tick if there is no load, tripping it into overvoltage protection, or a short causing it to trip into overcurrent protection. Youll need to go chasing to find out where it is, and what condition it is in. Easiest way is to start resistence checks on the output side of the converters.
  2. techknight

    SE/30 Schematics and the missing "Page 9"

    Actually, I wish I had page 9. but ive read schematics for years and years, and by studying the SE/30 schematics as long as I have, I know what page 9 was for.
  3. techknight

    SE/30 CMD-CTRL-POWER Reset

    The electrical reason for all of this, the power key on the keyboard is wired to its own pin the ADB connector. Guess what? its not wired up to anything on the SE/30 board. Thats why it doesnt, and would never work. But, what I Dont know is if the pin on the ADB connector is actually physically connected to the switch, or if its part of the matrix and that is simply an output from the keyboard's microcontroller. However if this was the case, it would need standby voltage to the keyboard at all times which I dont think it has outside of the power key wire.
  4. techknight

    Rescuing my dad's Classic II, last working in 1996

    Awesome father son/daughter time! Cherish it, let me tell ya.
  5. techknight

    Ethernet Hub Repair

    Other thing you need to look out for are the isolation transformers, make sure they are still good and not open circuit from port to port. They love to go pop especially with surges/lightning. I have fixed alot of dead NICs over the years that way.
  6. techknight

    restoring Li Ion batteries

    Some batteries have an EEPROM and you can "revirginize" a smart battery pack. ONCE you replace the cells, that is. Newer batteries are I2C/SPI SMBus and special software can be used to reset the microcontroller. Older batteries, need to be more invasive.
  7. techknight

    Floppy Disk Drive Read Head Repair

    Yea, even if you tried to repair this, youve lost all possiblity of obtaining cylinder/track alignment between sides.
  8. techknight

    SE/30 Schematics and the missing "Page 9"

    Page 9 is meaningless for the most part. it defines all the connectors and test points for a flying probe tester/scanner. Or bed of nails.
  9. techknight

    PowerBook 165 Grid Effect on LCD

    Umm, you broke the glass on the LCD! that thing is done bro. Look in the corner. You have to be super careful when redoing LCD displays, gotta pay attention to detail and not manhandle it. Scrap it, get another LCD and try again.
  10. techknight

    Portable and 12 volts !!!

    the PMGR chips are the same.
  11. techknight

    Portable and 12 volts !!!

    Hybrid is good, you have 5.18V of power regulation. you are gonna need to find a donor parts board and replace the PMGR IC.
  12. techknight

    Need some quick opinions on this 160 LCD.

    you could try getting a hot bar tip for your soldering iron, and reheating the ribbon back down. They are welded with a material to the glass. this can deteriorate or peel away if it wasnt a good "weld" to begin with. a hot bar will take care of that. But, be careful! In the factory a bead gets laid down by a machine, and then it gets hit with an ultrasonic transducer press and it welds everything together.
  13. techknight

    Portable and 12 volts !!!

    The hybrid is likely fine. The problem is most likely the PMU IC on the other end of the board, its probably toast. But to be sure, with the battery plugged in, press NMI and RESET buttons at the same time. This will reset the PMU. Measure the voltage at the transistor directly in the middle next to your 4-pin molex connector. its output should be 5.2V if you have that, the Hybrid is working. Then what I need you to do is attempt to power it up and feel around the CPU area with your fingers, mainly the 74 series chips near it if they are getting excessively hot. They fail often.
  14. techknight

    Fun with colour on my SE/30

    You could also spray the front CRT Glass with a rear projection paint, and use a micro LED projector with a mirror in the back to extend the throw-distance. It would give it the curved look. now THAT would be cool...
  15. techknight

    Fun with colour on my SE/30

    I have a few of those NEC panels, but they were all CCFL, and I had an 8.4" long ago, only ones I have now are around 10" They are all 90s TFT panels. I am shocked that a generic LCD controller would actually run that display, most of those older displays were a very early parallel standard with not enough RGB color bits to do anything.
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