Power Supply Troubleshooting - Toshiba Satellite M640 Maintenance Manual

2 Troubleshooting Procedures
2.3
C heck P ower Supply Status
Figure 2.3-1 Power Supply Troubleshooting Process
The power supply controls many functions and components. To determine if the power
supply is functioning properly, start with Procedure 1 and continue with the other Procedures
Satellite/Satellite Pro M600/M640/M645/M647 Series/Dynabook TX/AX Series Maintenance Manual

Power Supply Troubleshooting

ST A R T
(P rocedure 1)
A re the D C -IN and
B attery LE D s lit?
Y es
C heck power supply
connections
(P rocedure 3)
C an you turn the
com puter on?
No
A re the internal power
connections secure?
Y es
R eplace system board
E N D
R eplace adaptor / battery
No
(P rocedure 2)
R un diagnostic program
Y es
(P rocedure 4)
P erform internal connection
No
check
(P rocedure 5)
9