8170 N/B MAINTENANCE

8.7Keyboard (K/B) Touch-Pad (T/P) Test Error

Error message of keyboard or touch-pad failure is shown or any key does not work.

Keyboard or Touch-Pad

Test Error

Is K/B or

T/P cable connected to No Correct it. notebook

properly?

Yes

Try another known good Keyboard or Touch-pad.(Internal or external)

Test

Yes

Replace the faulty

Keyboard or

Ok?

 

 

 

 

Touch-Pad

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace

Motherboard

Board-level

Troubleshooting

One of the following parts or signals on the motherboard may be defective, use an oscilloscope to check the signals or replace the parts one at a time and test after each replacement.

Parts

 

 

Signals

 

U17

U509

 

IRQ1

KO[0:15]

U13

R78

 

IRQ12

KI[0:7]

U508 L520

 

-IOR

T_CLK

J12

L13

 

-IOW

T_DATA

L15

L16

 

 

XD[0:7]

XTAL

X503 R627

 

 

-H8_KBCS

EXTAL

C633 C630

 

 

-H8_A20GATE

 

C149 C139

 

 

 

-H8_MCCS

 

C135

J15

 

 

 

 

 

 

 

 

 

 

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