ea2000

For all you Delta PSU fans, I managed to repair the original psu. No change in the FRAG as I expected. I'll try to boot the memory test from a CD-RW next.

Sigh, you may be right. I'm assuming there's no way to test these RAM modules, right? If I added more RAM to the board could that allow the console to boot or does the first 64MB need to be good? Can it boot with at least 64MB working from any of the 8 banks? I've seen when they do 128MB upgrades and run XBlast to test the ram, sometimes some of the banks fail, but the console boots just fine.

I dumped the EEPROM and everything looks good:

I only did the CPU. I didn't think this could cause a FRAG, but I'll do the GPU just in case...

I've read elsewhere about the FOXLINK PSUs being crap, but I don't see where this is coming from. The unit looks extremely well built and the components appear to be good quality.

Yes, no change.

The PSU came off another 1.0 console that is working just fine, so I'm pretty confident it's not the PSU.

I managed to solve the 12v issue. It was a via near C8C5. I made sure to use a thick wire just in case. Fans are spinning now, but the console still FRAGs. I tried installing the modchip incase the stock BIOS is bad, but no change. I tested the modchip on a good console and it boots up just fine. I also tried with the drives connected, still FRAGs. As I mentioned before, the five 1500uf caps were replaced with new ones. The other caps look good and don't usually go bad, but what do you guys recommend?

No, and I think it's the other way around. A 1.6 in a non 1.6 case will short on the center screw terminal.

I pulled a good original PSU from a working console. Also, I had swapped cases to rule out a power button issue, but now the motherboard and PSU are in the original case. This console had an Aladdin modchip installed, which I've removed while troubleshooting. The D0 is not currently grounded. The console now FRAGs consistantly, but still no 12v on the motherboard. Here is a new video showing some voltages:

I'm pretty sure it's one of these. It even came with a 1.6 adapter which I no longer have: https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd.it%2Fe8mz66vvox631.png%3Fwidth%3D640%26format%3Dpng%26auto%3Dwebp%26s%3Dba7570dcd9c3bbe06fed4f2fa66239582b6c0cd3

Yeah, good idea. I'll take a look at it. Never trust a PSU with a lot of connectors.

The voltages measure as expected. If you watch closely in the video you'll see it flash green, stop flashing, then flash again before I press the button. Each one of these flashes appears to be a boot attempt. Some times it does three sets of green flashes and then FRAGs, but the fans never turn on. When it does FRAG it stays "on" until I press the button again to shut it off. If I measure voltages while its FRAGing there is 12v at the plug on the motherboard, but it doesn't seem to get very far since the fans don't spin and there is no drive activity if I connect them. The 5v does seem to get around the board as well as the 3.3v. The CPU heats up also.

The original PSU from this Xbox was dead. I'm using a known good PSU which is one I ordered a long time ago from China. It has dual adapters and is multi-voltage (110-220). It does not work on a 1.6, however.

Here is a short video showing the issue.