PS/2 ,USB,SATA

Sephiroth Kwon

GRMA

26-05-2009

PS/2

Outline

• Diagram• Signal Description• Repair Flow Chart• Repair Technique

PS/2 Diagram

Signal Description (PS/2 Mouse)

Pin Define Signal Description

1 Data Data signal

2 N/C Not connection

3 GND Ground signal

4 VCC Power signal (+5VDC)

5 CLK Clock signal

6 N/C Not connection

Signal Description (PS/2 KB)

Pin Define Signal Description

1 Data Data signal

2 N/C Not connection

3 GND Ground signal

4 VCC Power signal (+5VDC)

5 CLK Clock signal

6 N/C Not connection

Repair Flow Chart

START

Measure PS2 5V_Dual is correct

Finished

Visual Inspection Check Connector. RLC components

& PS2 Jumper

Change NG PS2 Connector, RLC components,

and Mount PS2 Jumper

Check PS2 Jumper is ok, 5V_Dual trace is not open,

inductor is ok.

Change NG PS2 Jumper, fix the open trace or change NG

inductor

Measure PS2 CLK& Data signal is OK

Measure the bias value of CLK & DATA signals, trace NG

signal’s connection.

Change NG RLC components or fix any

pcb open

Change Super I/O or SB

OK

NG OK

NG

NG

NG

NG

OK

OK

OK

USB

Outline

• Diagram• Signal Description• Repair Flow Chart• Repair Technique

USB Diagram

SouthBridge

EX : R = 0 OHM

Signal Description

Pin Define Signal Description

1 VBUS Power signal

2 D- Data signal

3 D+ Data signal

4 GND Ground signal

Repair Flow Chart

START

Change DefectConnector

Visual Inspection CheckConnector & Pins No

Damaged.

Check USB 5V (SB)--VBUS(USB Vcc)

Check USB 5V Jumper,Related Trace, Fuse, Inductor.

Change DefectComponent

Check USB 48Mhz at Clock Generator

Check 48 MhzRelated CLK Gen,

Resistor, Trace

Change DefectComponent

Check USB-, USB+ SignalsCheck USB-,USB+

Related SB, Resistor,Capacitor, Trace

Change DefectComponent

Finished

OK

OK

OK

OK

NG

NG

NG

Repair Technique-Visual Inspection

1

Visual inspection check USB connector appearance and inside pins no damaged, USB 5V(SB) jumper is mounted.

Repair Technique-Check USB 5V_Dual

2

Use Multi-meter to check USB 5V Vcc (5V_Dual) is correct.

Repair Technique-Check CLK_USB

3-1

3-2

Check USB CLK 48Mhz fromCLK Generator.

Repair Technique-Measure USB-,USB+

4-2

Use Multi-meter to measure USB-,

USB+ bias voltage value. The value should be the same. If you find the value is high, please check related resistor or inductor is ok & trace is not open. If the value is low please check there’s no component short or SB short.

If the problem is still existing after you check above, please try to change South Bridge.

4-1

Q & A (Repair Experience)

• Most of USB problems caused by USB 5V Vbus (Vcc) is not correct. Sometimes we can find inductor bad, trace burned or forgot to mount USB jumper.

• If You’ve checked USB 5V, 48Mhz, USB- & USB+ signals but can’t find unusual root cause, please try to change South Bridge.

SATA

Outline

• Diagram• Signal Description• Repair Flow Chart• Repair Technique

Diagram

C C C C

Pin2 Pin6Pin3 Pin5

Pin1Pin4 Pin7

SouthBridge

Signal Description

S1 Gnd

S2 A+ Signal line(pair A)

S3 A- Signal line(pair A)

S4 Gnd

S5 B+ Signal line(pair B)

S6 B- Signal line(pair B)

S7 Gnd

Signal S

egment

Pin1……………Pin4……………….Pin7

Repair Flow Chart

START

Visual Inspection to check SATA connector is

no damaged

Change NG connector, Test again

Check CLK CK_SATA_SB,CK_SATA_SB# from

Clock generator

Use meter to measure signal’s bias voltage value, compare

with good MB.

Trace to check related R.L.C. components and

circuit trace.

Change SB

Finished

NG

OK

OK

NG

OK

OK

NG

NG

NG

NG

OK

OK

If no CLK check CLK Generator & related trace.

resistors.

Repair Technique-Visual Inspection

1

Visual Inspection to check SATA connector is not damaged.

Repair Technique-Measure SATA CLK

2-1

2-2

Measure SATA CLK from CLK Generator.

Repair Technique-Measure SATA signals

3

Use Multi-meter to measure SATA signals (A+ & A- , B+ & B-)

Trace the circuit to SB if any signal is error. If there is no trace short or open please try to change SB.

Thank You!