Recent content by davidg5678

Brilliant work!

I second this! @herd Do you have any information about these interposer boards for laptops?

Awesome work so far! I'm eager to try the same modifications to my own iBook. As far as the GUI flashrom program goes, did you make sure to follow this step from Dosdude? Otherwise, I'm guessing that as long as you pick a Linux distribution that is era-appropriate for the iBook Clamshell, it...

I've recapped and reassembled the Quicksilver PSU! Unfortunately, it still doesn't seem to work. I'm seeing 0.00A current draw which is disappointing. As a test load, I've connected an IDE hard drive. I thought I could get away with shorting the green PSU power-on pin to ground, but I'm seeing...

Fascinating work! Were you able to run any benchmarks before and after completing the upgrade? Any idea whether some of these Clamshell models already have the upgraded cache from the factory?

I've started working on this PSU again! A few notes, while work is still in-progress: The PSU is really dense and cramped inside. I needed to remove all of the major power transistors and the heatsinks holding them in place. I didn't want to disassemble the PSU so substantially, but I have no...

Hi all! Has anyone here worked on the SMPS for a G4 Quicksilver? I've got one on the bench that seems to be failing to start up. It sort of pulses on and then off and is probably entering a protection mode. I've got a general book on SMPS repair that I'm reading, and will soon use it to apply...

Those look like zener diodes to me. I'd try pulling the D909 neighbor diode out of the PCB and measure its characteristics. I'd wager they likely share the same specifications. If you desolder the D920 diode, there might also be some small label on the component body that could help ID it. I...

Can you provide some high resolution pictures of the new style driver boards you are using (unmodified)? I can try and reverse engineer them to see if there's any substantial difference.

Sounds like you've been making some good progress! I think this machine in its current state would be a good candidate for the serial terminal self test mode:

What features of the Sega are being used here? If the CPU, ROM, and RAM are all contained in the cartridge, and the video signal is output via VGA, (presumably through another port on the cartridge) then what makes this different from a Macintosh-compatible clone that happens to fit inside a...

Something to keep in mind is that there are a few variations of iBook Clamshell batteries --this means they don't all look exactly the same when you crack them open. I have seen some battery packs that come with orange 18650 cells and others that come with green cells. I seem to remember the...

Update: I temporarily tied /RESET to GND using a wire soldered to the CPU pin on one end, and tapping the other end of the wire against GND (through a 10k resistor in series). This produced no changes. I might try again with the sound chip completely removed (after using this same setup to first...

This is far from a silly question! I just checked, and when I short the reset button's pads together, nothing seems to happen at all! Before I go about swapping the sound chip, is there any way to bypass the sound chip and traditional reset circuit entirely? I wonder if I can tap directly into...

Hi all, I am troubleshooting a Macintosh Classic that has severe battery damage (probably a lost cause, but I like a good challenge). The AB, PSU, and CRT are all tested and known good. This machine displays horizontal stripes at power up, which I understand means the VRAM is not getting...