Toshiba Satellite L450 L450d Pro Maintanance Manual
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Page 51
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual
17
2.5 Keyboard Troubleshooting
P erform external keybo ard check
(P rocedure 1)
STA RT
D oes the external
keyboard function ok?
P erform diag nostic check (Procedure 2)
W as a keyboard
problem detected?
P erform con nector and replacem ent check
(Procedure 3)
R eplace system board
END
Yes
No
K eyboard is not
fa u lty . C o...
Page 52
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual
18
To determine if the computer’s keyboard
is functioning properly, perform the following
procedures. Figure 2-4 outlines the process. Start with Procedure 1 and continue with the
other procedures as instructed.
Procedure 1: External keyboard check
Procedure 2: Diagnostic check
Procedure 3: Connector and replacement check...
Page 53
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual
19
Check 3 The system board may be damaged. Replace it with a new one following the
instructions in Chapter 4.
2.6 External USB Devices Troubleshooting
R eplace system board
(P ro c e d u re 2 )
EN D
Original USB
d e v ic e is fa u lty
P e rfo rm e x te rn a l d e v ic e a n d connection check(P ro c e d u re 1 )
STA...
Page 54
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual
20
To determine if the computer’s external US B devices are functioning properly, perform the
following procedures. Figure 2-5 outlines the process. Start with Procedure 1 and continue as
instructed.
Procedure 1: External device and connection check
Procedure 2: Replace system board
Procedure 1 External device and...
Page 55
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
21
2.7 Touchpad Troubleshooting
START
END
TouchPad connection
check (Procedure 1)
TouchPad replacement check (Procedure 2)
Replace system board
Figure 2-6 Touchpad troubleshooting process
Page 56
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
22
To determine if the computer’s built-in T
ouchPad is functioning properly, perform the
following procedures. Figure 2-9 outlines the proce ss. Start with Procedure 1 and continue as
instructed.
Procedure 1: TouchPad connection check
Procedure 2: TouchPad replacement check
Procedure 1 TouchPad connection check
The TouchPad...
Page 57
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
23
2.8 Speaker Troubleshooting
START
Do all sources have
same problem?
END
Perform earphone test
(Procedure 2)
Do earphones
function correctly?
Perform connection check
(Procedure 3)
Perform replacement check
(Procedure 4)
Perform audio source test
(Procedure 1)
/P
:FT
Yes
Replace system board
Speakers are notfaulty. Continue...
Page 58
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
24
Procedure 1: Audio source test
Procedure 2: Earphone test
Procedure 3: Connection check
Procedure 4: Replacement check
Procedure 1 Audio source test
Try different audio sources (e.g. an audio CD and digital music file) to determine whether the
fault is in the speaker system or not. If not all sources have sound...
Page 59
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
25
2.9 Optical drive troubleshooting
START
Audio CD functions ok?
END
Perform software check (Procedure 3)
Perform diagnostic test(Procedure 4)
Perform connection and
replacement check(Procedure 5)
Perform audio CD check
(Procedure 1)
Perform drive-
cleaning check (Procedure 2)
No
Yes
Replace system board
Figure 2-8 Optical drive...
Page 60
2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
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Figure 2-8 outlines the process. Perform the steps below starting with Procedure 1 and
continue with the other procedures as required.
Procedure 1: Audio CD test
Procedure 2: Drive cleaning check
Procedure 3: Software check
Procedure 4: Diagnostic test
Procedure 5: Connection and replacement check
Procedure 1 Audio...