Can Someone Double Check My Lpc Diagram Please

[livefast9986 1]

Hey guys, I was reading barnitos LPC diagnostic thread to fix my xbox (still working on it) and i noticed that the baldbouncer image's is incredibly difficult to read and see what pins he is pointing too. I decided to try and update it with a higher-res photo and color coordinate the pins the the corresponding contact hole but I need someone to double check (preferably someone who has done this before) to make sure I'm pointing to the right ones. Can anyone confirm that I've got the Pin #7 going to the right contact hole and that the contact hole for Pin #4 is the proper one?

 

Thank you.

 

 

[KaosEngineer 725]

What's this needed for?  IIRC, all signals are present on 1.0/1.1/1.2/1.4 motherboards.  There's no rebuild necessary.

Do you have a multimeter?  Measure for continuity between the LPC debug header feedthru holes to the via you've marked for each.

[KaosEngineer 725]

There is no pin #4 on the LPC debug port.  Pin 1 is the square pad and they count moving back and forth across the connector then to the left.

Pin Layout

Name	Pin	Pin	Name
SERIRQ (v1.0)	16	15	3.3V
SDA	14	13	SCL
GND	12	11	LAD0
LAD1	10	9	3.3V
LAD2	8	7	LAD3
5V	6	5	LRESET#
PWR (v1.6)	4	3	LFRAME#
GND	2	1	LCLK

Pin 4 header hole is only present on v1.6's - see https://xboxdevwiki.net/LPC_Debug_Port. It's the power on control signal.  Connect the pin to ground then remove the ground connection to power on/off the console.

[livefast9986 1]

The issue is for if you destroy your LPC or accidental cut a trace that connects to it for these boards.

You are correct, there is no Pin 4, when looking at the LPC properly, but if you look at the photos the Pin 4 I am referring to is different (I was trying to keep it consistent with the old photo that I'm trying to improve on).

Using this following chart, the Pin 4 in the photo is actually Pin 7 proper. 

 

 

Rightfully numbered LPC pin	Baldbouncer's Image numbering
1	1
2	11
3	2
5	3
6	10
7	4
8	9
9	5
10	8
11	6
12	7

 

I could test with a multimeter to see if it reads near 0 ohms, but the issue at hand is i sitll dont know exactly what contact hole/via i should be testing since the photo i'm using as reference is difficult to read.

[KaosEngineer 725]

Do you have a copy of the picture of the LPC debug port with Baldbouncer's pin numbering?

Update: Oops, I see it now in the original post. Those white numbers don't show up too well until I zoomed in on the picture.  He should have placed larger numbers in the blown up section of the picture.

[KaosEngineer 725]

From what I see. Baldbouncer's LPC diagram pin #7 is actually pin 12 in xboxdevwiki's and is connected to ground.  There are so many locations that ground can be obtained.  However, I believe one of the inner layers of the Xbox's multiplayer PCB is a ground plane and it's connected inside the plated feed-through hole to that layer of the board.  You'd have to rip the entire plated section out of the hole to destroy the connection to it.

The reason there are feed thru holes all around each of the motherboard mounting screw grounding pads on the top and bottom sides of the motherboard - they connect the pad to the inner ground plane layer of the motherboard.

I'm not sure why he pointed out that particular location of the PCB on his diagram for the pin 7 connection.

[livefast9986 1]

Ok. So i circled the wrong pin 7 on my diagram. It should be one of the via holes to the left of the one I circled. Ok good to know. 

[SS_Dave 611]

21 hours ago, livefast9986 said:

Hey guys, I was reading barnitos LPC diagnostic thread to fix my xbox (still working on it) and i noticed that the baldbouncer image's is incredibly difficult to read and see what pins he is pointing too. I decided to try and update it with a higher-res photo and color coordinate the pins the the corresponding contact hole but I need someone to double check (preferably someone who has done this before) to make sure I'm pointing to the right ones. Can anyone confirm that I've got the Pin #7 going to the right contact hole and that the contact hole for Pin #4 is the proper one?

 

Thank you.

 

 

A quick test with a multi meter shows the the lines you have marked in this pic are conected.
 

Are you having problems with a board?

 

Cheers

SS Dave

Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

[chrismcompton74 1]

soldering wires to these points is a nightmare, Lol... sometime up to 2 to 3 hours..crazy.... It's much easier to use a LPC rebuild board for a 1.6, within 5 minutes I'm done. what you have here is nothing like any LPC rebuild I have seen, what exactly are you trying to do here?

Edited April 24, 2020 by chrismcompton74

[livefast9986 1]

Sorry for my late reply. This is not for a 1.6 LPC rebuild. This is for 1.0-1.5 for when you cut some traces and/or destroyed part of your LPC. 
 

I’m pretty sure I destroyed my LPC because my Xbox has been stuck in a on/off boot cycle 3x then frag when I have my mod chip installed.

[SS_Dave 611]

So it boot fine with the modchip disconnected?

What color are the flashing lights?

What modchip?

 

Cheers

SS Dave

Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.