FRAGing.. what, specifically, should I check?

[BrianM]

First off, the basics. Xbox V1.0, I installed the pin-header, D0 checks out just fine (as it should with a FRAG from what I read here). Boots to the MS dash just fine with the chip disabled, which all leads to needing to double/triple check the LPC. I've triple-checked my soldering and everything Looks good, but I don't want to trust that. I'd like to do a continuity check between the Pin Header pins andsomewhere away from the LPC... is there a guide for this? (I looked and was unable to find even a reference to one, just people saying to check things).

How about a reference to there being continuity between pins? I have a couple that show, but they're not all next to one another and I don't see any issues with solder on traces.

I don't mind checking my own work, just need a little help with the checks to be performed.

thanks... (and damn, my solderless 2.2l+ went Flawlessly several years ago, wish this were as simple).

Brian

 

[BrianM]

Er, can't edit... thought I'd toss in that the chip seems fine. I flashed it with a programmer and had no issues there, so I'm realtivly certain it's in my workmanship.

 

[Big_Whoopin]

Wow, I think you're the first person I've seen post here that has stated outright that you believe the problem is your work. I applaud you sir, for not hiding behind the "not me, it's the chip!" claim.

Anyway, check out the LPC link in my sig. There are a few test suggestions, measuring the voltage on the different pins as well as continuity between the pins and the board. Good luck.

While that answers your LPC question, also be sure your plugs for the switches are properly seated. You may also want to test out the switch bank itself. When you boot from the chip and FRAG, do you get the LEDs lit up? At least 3 on the switches (enabled, protect/unprotect and bank 1/2) and the blue one in the circular cut out on the chip board. If not you've probably got a 5v problem. Littlemiss has a link to my schematic in their sig, I'm to lazy to look it up right now. Search for schematic in this forum and you'll find it.

-Whoopin

 

[BrianM]

Thanks much, that's Exactly what I needed. And as suspected, I have an issue with one of the pins. #1. It's pissing me off too, I've completely pulled that pin at this point and even with a little help from an Xacto blade to clean things up, I'm still not getting continuity to the spot listed on your check point.

You'd mentioned that one of them was wrong in the writeup (per something on xbox-scene forums), but the trace LOOKS like it goes to that spot (right by 3 and 5, both of which work every time) and all the rest work fine too.

My eyes are tired now... to much peering through a magnifying glass at tiny traces and objects.

Thanks again though.. at least I know where the issue is.

 

[Big_Whoopin]

Well, someone said it was wrong in the write up. The article isn't my work, I simply provided the link for you to follow. One thing you could try if you are certian that is the correct trace (again, not my article and I don't have my mobo out to confirm) would be to run a new wire on the underside or even topside if needed to the point. Use something small, like 30 gauge. It will be similar to doing the 1.6 LPC rebuild prior to the nice rebuild board being released.

-Whoopin'

 

[BrianM]

eh.. I just ran a jumper for the LClk and it's booting fine now.

Sure do wish I knew WTF happened to the LPC hole as I don't trust the jumper wire. :/

Thanks again though...

 

[paragon_au]

Sorry to butt in, Just wondering Whoopin', if you know where I can find an LPC test for a 1.6b.
I had a look at xbox-scene but wasn't able to find one.

 

[Big_Whoopin]

I'm not aware of such a diagram for the 1.6b, but using some logic you should be able to figure out where to test and what the measurements should be. If you've done the LPC rebuild then the tests should be the same as on the X-S page. If not, you'll use the LPC page at X-S for what the pins should measure and the X2.6 wire install sticky in this forum. Assign the color coding from the 1.0-1.5 image in the sticky to the LPC diagram at X-S. You'll find that LClk = black, Ground = brown, 5v = red, etc. Now assign the labels to the matching color points on the 1.6 wire install diagram. You can then test that you are still getting the proper readings at the different points. As far as I can tell this should work.

If you are looking for "this pin should link to this point on the motherboard" in order to check for damaged traces, again I have not seen such an image around. The best help I could provide here is the suggestion of good lighting and a magnifying glass. I've had to do this on boards myself, and it's a pain.

-Whoopin'