PCBA Debug Guide

Memory Faults

Debug Guide

Rev. 3.2

Página 1 de 8

Rev. 3.2

PCBA Debug Guide

1. Revision History

Revision

Description

Author/Revised

Date

1.0

Draft release

Luis Rodriguez

11 0ct 2005

2.0

3 Repair now include all left

memories and created

category for BGA problems

related.

José Candelario

Bravo

10 Jan 2006

2.1

Updated Category F

(Added replacement of component:

U4D1)

José Candelario

Bravo

30 Jan 2006

2.2

Replaced Category H for

Category G and deleted the

last one.

José Candelario

Bravo

10 Feb 2006

2.3

Updated Category B

(Added a new front panel error code and

the components to repair)

Luis Rodríguez

José C. Bravo

16 Feb 2006

2.3

Updated Category D

(Added replacement of components:

U4D1)

Luis Rodríguez

José C. Bravo

16 Feb 2006

2.4

Updated Category B,D,E & F

(Added replacement of component in first

repair: U4D1)

Luis Rodríguez

José C. Bravo

16 Mar 2006

3.0

Added Category H

(Group 1

repair U4D1 into the category

H for the Front Panel Error Codes 0x10

to 0x15 with CPUs bits 01000000)

Luis Rodríguez

José C. Bravo

17 Mar 2006

3.1

Updated Category H

(Group 1

repair U4D1 into the category

H for the Front Panel Error Codes 0x10

to 0x15 with CPUs bits 10101111)

Luis Rodríguez

José C. Bravo

22 Mar 06

3.2

Updated Category H

(Added repair action for CPU bits

01110101)

Luis Rodríguez

José C. Bravo

05 April 06

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Rev. 3.2

PCBA Debug Guide

2. Table of Contents

3. Introduction

This document describes a process for diagnosing and repairing Memory failures
from the PCBA tester. The process and groupings below outlines possible
measurements to determine the appropriate component, for repair or
replacement. Core digital errors can also be identified by 3 of the 4 LEDs on the
“ring of light” flashing.

4. Scope

This document has been developed from experience gained on X803158-001
Xenon XDK motherboards. The failure analysis process outlined in this document
should be used in conjunction with the “Motherboard Debug Guide Development
Process” document.

5. Audience

This document is aimed at Engineers and Technicians who are performing first
pass debug of core digital failures from the XBOX360 motherboard PCBA tester.

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Rev. 3.2

PCBA Debug Guide

6. Process

Check on the Front panel the what kind of error code 0xxx shows or look at the
TV what error Exx is. The errors on the front panel are in hexadecimal and the
errors in the TV are in decimal.

7. Category Grouping

7.1 Category A V_MEM voltage problem

The SMC releases the VREG_1P8_EN_N line and enables the V_MEM controller

(U4V1).

1. Check V_MEM voltage on L3F1.2 (1.8V). If voltage is not present

• Check Q2F1 & Q3F1 for shorts, change as necessary
• Check if VREG_1P8_EN is present on U4V1.11

If is ok then change U4V1

If not present, check SB (SMC), replace as necessary

1.8v

2. Try new latest Kernel firmware

3. Replace U3D1 & U3E1 if don’t fix the problem change the mirrors (U3R1

& U3T1)

If the fail carry on then replace U4F1 & U5F1 if the problem is till present

change mirrors (U4U1 & U5U1)

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Rev. 3.2

PCBA Debug Guide

7.2 Category B Error Code 0x10, E16

ERROR_NBINIT_MEM_VENDOR_ID

Front panel Code

Bits CPU

(Decimal)

Components

Action procedure

01110111

(119)

U5F1/U5U1

U3D1/U3R1

U3E1/U3T1, 4F1/U4U1

Repair

0x10

For another bits refer to Category H

7.3 Category C Error Code 0x11, E17

ERROR_NBINIT_MEM_READ_STROBE_DATA_WRITE

7.4 Category D Error Code 0x12, E18

ERROR_NBINIT_MEM_READ_STROBE_DELAY_TRAINING

Front panel Code

Bits CPU

(Decimal)

Components

Action procedure

01000001

(65)

U5F1/U5U1

U3D1/U3R1

U4F1/U4U1, U5F1/U5U1

Repair

01000011

(67)

U3E1/U3T1

U3D1/U3R1

U4F1/U4U1, U5F1/U5U1

Repair

01000100

(68)

U3E1/U3T1

U3D1/U3R1

U4F1/U4U1, U5F1/U5U1

Repair

01110111

(119)

U5f1/U5U1

U4F1/U4U1

U3E1/U3T1, 3D1/U3R1

1st Repair

2nd Repair

3rd Repair

0x12

For another bits refer to Category H

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Rev. 3.2

PCBA Debug Guide

7.5 Category E Error Code 0x13, E19

ERROR_NBINIT_MEM_WRITE_STROBE_DELAY_TRAINING

Front panel Code

Bits CPU

(Decimal)

Components

Action procedure

01000100

(68)

U3D1/U3R1

U3E1/U3T1

U5F1/U5U1, U4F1/U4U1

Repair

0x13

For another bits refer to Category H

7.6 Category F Error Code 0x14, E20

ERROR_MEMORY_ADDRESSING

Front panel Code

Bits CPU

(Decimal)

Components

Action procedure

01000001

(65)

U4F1/U4U1

U4D1

U5F1/U5U1,U3D1/U3R1, U3E1/U3T1

Repair

01000010

(66)

U4F1/U4U1

U4D1

U5F1/U5U1,U3D1/U3R1, U3E1/U3T1

Repair

0x14

For another bits refer to Category H

7.8 Category G Error Code 0x15

ERROR_MEMORY_DATA

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Rev. 3.2

PCBA Debug Guide

7.9 Category H CPUs Bits

Bits CPU
(Decimal)

Front Panel
Error Code

1st Repair

2nd Repair

3rd Repair

01000000

(64)

0x10, 0x11,
0x12, 0x13,
0x14, 0x15

U4D1 U5F1/U5U1

U3D1/U3R1

10101111

(175)

0x10, 0x11,
0x12, 0x13,
0x14, 0x15

U4D1 U4F1/U4U1

01110101

(117)

0x10, 0x11,
0x12, 0x13,
0x14, 0x15

U4D1

Any CPU Bits
no mentioned

before

0x10, 0x11,
0x12, 0x13,
0x14, 0x15

U4D1

Bit: 0 1 2 3 4 5 6 7

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Rev. 3.2

PCBA Debug Guide

Do measures on the test points behind U7D1 (bottom side)
e.g.
Bits order: 76543210
Value 64: 01000000
Value 175:10101111

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Rev. 3.2

Document Outline