Toshiba Satellite L450 L450d Pro Maintanance Manual

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
7 
If the diagnostics program cannot detect an erro
r, the problem may be intermittent.  The test 
program should be executed several times to isolate the problem.  When  a problem has been 
located, perform the appropriate trou bleshooting procedures as follows:  
1.  If an error is detected by  the battery test, perform th e...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
8 
Other problems that are not covered by the di
agnostics program may be discovered by a 
user. 
1.  If an error is detected when using an ex ternal USB device, perform the External USB 
Devices Troubleshooting procedures in Section 2.6 
2.  If an error is detected when using the  speakers, perform the Speaker Troubleshooting...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
9 
2.3  Power Supply Troubleshooting 
START
Are the DC-IN and
B attery L E D s lit?
Can you turn the computer on?
A re the internal po w erconnections secure?
END
Check Power Supply Status (Procedure 1)
/P
:FT
Check power supplyconnections
(Procedure 3)
Run diagnostic program (Procedure 4):FT
/P
Replace adaptor / battery (Procedure...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
10 
The power supply controls many functions and 
components.  To determine if the power 
supply is functioning properly, star t with Procedure 1 and continue with the other Procedures 
as instructed. The flowchart in Figure 2-2 give s a summary of the process.  The procedures 
described in this section are: 
Procedure 1:  Power...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
11 
Table 2-2 DC-IN LED 
AC-IN LED  Power supply status 
Solid on  AC power exists (LED is solid White). 
Off  No AC power exists. 
 
To check the power supply status, install a ba ttery pack and connect an AC adaptor to the 
DC-IN port on the computer and to a power supply. 
If the DC-IN LED or Battery LED  is not lit, go to...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
12 
Procedure 3  Power supply connection check 
The power supply wiring diagram is shown below: 
AC
adaptorSyst em boardBattery
AC adaptor cord
AC p o we r  c o r d
 
Any of the connectors may be disconnected.  Perform Check 1. 
Check 1  Disconnect the AC power cord from  wall outlet. Check the power cable for 
breaks. If the power...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
13 
Procedure 4  Diagnostic check 
The power supply may not charge the battery
 pack.  Perform the following procedures: 
1.  Reinstall the battery pack. 
2.  Attach the AC adaptor and turn on the power .  If you cannot turn on the power, go to 
Procedure 5. 
3.  Run the Diagnostic test following the proce dures described in...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
14 
2.4  Display Troubleshooting 
Perform  external display check
(Procedure 1)
STA RT
D oes the external
display function ok?
Perform  diagnostic check (Procedure 2)
No
Was a display
problem  detected?
Perform  connector and replacem ent check (Procedure 3)
R eplace system  board
END
Yes
Yes
No
Display is not
faulty. Continue...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
15 
 
This section describes how to determine if the computer’s display is functioning properly.  
The process is outlined in Figure 2-3. Start wi
th Procedure 1 and continue with the other 
procedures as instructed. 
Procedure 1:  External display check 
Procedure 2:  Diagnostic check 
Procedure 3:  Connector and replacement check...

2 Troubleshooting Procedures 
 Satellite L450D/455D, Satellite pr o L450D Series Maintenance Manual 
  
                                                                       
16 
Procedure 3  Connector and replacement check 
The FL inverter board, LCD module, and system board are connected to the display circuits.  
Any of these components may be 
damaged.  Refer to Chapter 4, Replacement Procedures, for 
instructions on how to disassemble the com puter and then perform the following checks: 
Check 1...