Toshiba Satellite L450 L450d Pro Maintanance Manual

							2 Troubleshooting Procedures 
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual 
 
                                                                    
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following procedures. Figure 2-13 outlines the process. Start with Procedure 1 and continue 
with the other procedures as instructed. 
Procedure 1:  Diagnostic test 
Procedure 2:  Connector and replacement check 
Procedure 1  Diagnostic test 
Run the Diagnostic Program, which will automa tically execute the HDD R/W test.  Refer to 
Chapter 3, Tests and Diagnostics for  more information on the program. 
If an error is located, go to  Procedure 2.  If an error is not located, the HDD function is 
functioning properly. 
 
Procedure 2  Connector and replacement check 
The HDD module or system board may be disc onnected or damaged.  Disassemble the 
computer following the steps described in Chapter 4,  Replacement Procedures, and perform 
the following checks. 
 
Check 1  Make sure that the HDD module is secu rely slotted into the system board. If the 
problem persists, go to Check 2. 
Check 2  The HDD module may be damaged. Replace it with a new one following the  instructions in Chapter 4. If the problem still exists, perform Check 3. 
Check 3  The system board may be damaged.  Replace it with a new one following the  instructions in Chapter 4.  
						

							2 Troubleshooting Procedures 
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2.15  CRT Troubleshooting  
Perform  C R T  connection 
check
(Procedure 1)
ST A R T
Does replacement  CRT cable
function properly?
Perf o rm  C R T  set ch eck (Procedure 2)
R eplace sy stem  board
EN D
YesReplace CRT 
cable
No
C R T  functioning ok ?
NO
U se different CRT setYes
Check CRT  Port 
connection
 
             Figure 2-14 CRT Troubleshooting Process 
 
To determine if the computer’s CRT port is  functioning properly, perform the following 
procedures. Figure 2-14 outlines the process.  Start with Procedure 1 and continue as 
instructed. 
Procedure 1:  CRT connection check  
						

							2 Troubleshooting Procedures 
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Procedure 2:  CRT set check 
Procedure 1  CRT connection check 
The CRT cable may be damaged or the conne ctions may be loose. Perform Check 1: 
Check 1  Make sure CRT cable is firmly pl ugged into both the CRT set and the CRT port 
of the computer. If the cable is  connected correctly, go to Check 2. 
Check 2  Make sure the CRT port is firmly secu red to the system board of the computer. If 
the malfunction remains, go to Check 3. 
Check 3  The CRT cable may be damaged. Re place with a good cable. If the malfunction 
remains, go to Procedure 2. 
Procedure 2  CRT set check 
The CRT set may be faulty. Perform Check 1: 
Check 1  Try using the set for CRT reception. If it does not work, the set may be damaged.  If the set does work, perform Check 2. 
Check 2  Try connecting a different CRT to th e computer. If the replacement CRT works, 
the original set may be damaged. If the re placement set does not work the system 
board may be damaged. Replace it with a new one following the instructions in 
Chapter 4. 
  
						

							2 Troubleshooting Procedures 
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2.16  HDMI Troubleshooting  
Perform  H D M I connection
check
(P rocedu re 1 )
STA RT
D oes replacem ent H D M I cable
function properly?
Perform  H D M I set check (P rocedu re 2 )
R eplace system  board
END
YesR eplace H D M I
cable
No
H D M I functioning ok?
No
U se differen tHDM I setYes
 
Figure 2-15 HDMI troubleshooting process  
 
To determine if the computer’s HDMI port  is functioning properly, perform the following 
procedures. Figure 2-15 outlines the process.  Start with Procedure 1 and continue as 
instructed.  
						

							2 Troubleshooting Procedures 
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual 
 
                                                                    
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Procedure 1:  HDMI connection check 
Procedure 2:  HDMI set check 
Procedure 1  HDMI connection check 
The CRT cable may be damaged or the conne ctions may be loose. Perform Check 1: 
Check 1  Make sure HDMI cable is firmly pl ugged into both the CRT set and the CRT port 
of the computer. If the cable is connected correctly, go to Check 2. 
Check 2  Make sure the HDMI port is firmly s ecured to the system board of the computer. 
If the malfunction remains, go to Check 3. 
Check 3  The HDMI cable may be damaged. Replace with a good cable. If the malfunction  remains, go to Procedure 2. 
Procedure 2  HDMI set check 
The TV set may be faulty. Perform Check 1: 
Check 1  Try using the set for television reception. If it does not work, the set may be  damaged. If the set does work, perform Check 2. 
Check 2  Try connecting a different television to the computer. If the replacement  television works, the original set may be damaged. If the replacement set does not 
work, the system board may be damaged. Replace it with a new one following the 
instructions in Chapter 4. 
 
 
 
  
						

							2 Troubleshooting Procedures 
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2.17  MIC Troubleshooting 
 
Figure 2-16  MIC troubleshooting process  
The MIC line or system board may be the re ason of a MIC fault. Either of these two 
components may be damaged. To determine if  the computer’s MIC is functioning properly, 
perform the following procedures. Figure 2-16 outlines the process. Start with Procedure 1 
and continue with the other procedures as instructed. 
  
						

							2 Troubleshooting Procedures 
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Procedure 1:  Diagnostic test 
Procedure 2:  Connector and replacement check 
Procedure 1  Diagnostic test 
Run the functioning Program on Windows model,  which will display the MIC test result. 
If tests and diagnostics result abnormal go to Pr ocedure 2. If an error is not located, the MIC 
module functioning is properly. 
 
Procedure 2  Connector and replacement check 
The MIC line or system board may be disconnect ed or damaged.  Disassemble the computer 
following the steps described in Chapter 4,  Replacement Procedures, and perform the 
following checks. 
 
Check 1  Make sure that the MIC line is secu rely slotted into the system board. If the 
problem remains, go to Check 2. 
Check 2  The MIC line may be damaged. Replace it with a new one following the  instructions in Chapter 4. If the problem still exists, perform Check 3. 
Check 3  The system board may be damaged.  Replace it with a new one following the  instructions in Chapter 4. 
 
 
 
 
 
 
 
  
						

							2 Troubleshooting Procedures 
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2.18  Thermal Module troubleshooting 
 
                                   
START
END
CPU replacement check
(Procedure 1)
Thermal module
replacement check
(Procedure 2)
Replace system board
 
Figure 2-17 Thermal Module  troubleshooting process 
 
 
To determine if the computer’s built-in Ther mal Module is functioning properly, perform the 
following procedures. Figure 2-17 outlines the process. Start with Procedure 1 and continue 
as instructed. 
Procedure 1:  CPU replacement check 
Procedure 2:  Thermal Module replacement check 
Procedure 3:  System board replacement check 
  
						

							2 Troubleshooting Procedures 
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Procedure 1  CPU replacement check 
Refer to Chapter 4, 
Replacement Procedures,  for instructions on how to disassemble the 
computer and then perform the following checks. 
If there is still an error after  replacement CPU, go to Procedure 2. 
Procedure 2  Thermal Module replacement check 
Refer to Chapter 4,  Replacement Procedures,  for instructions on how to disassemble the 
computer and then perform the following checks. 
If there is still an erro r after replacement Thermal  Module, go to Procedure 2. 
Procedure 3  System board replacement check 
Replace the system board with a new  one following the steps in Chapter 4. 
 
 
 
 
 
 
  
						

							2 Troubleshooting Procedures 
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2.19  LAN troubleshooting 
                                   
Perform LAN cable
connection check (P ro c e d u re  1 )
STA R T
D oes replacem ent LAN cable
fu n c tio n  p ro p e rly ?
P erform  L A N  port check (P ro c e d u re  2 )
R eplace system  board
EN D
NoR eplace L A Ncable
Yes
L A N  port functioning ok?
Yes
U se differentLA N  portNo
 
Figure 2-18 LAN troubleshooting process 
To determine if the computer’s built-in LAN is functioning properly, perform the following 
procedures. Figure 2-18 outlines the process.  Start with Procedure 1 and continue as 
instructed.