Toshiba Satellite M40 / M45 No Power

The power supply in the computer controls many functions and components. To check if the
power supply is defective or malfunctioning, follow the troubleshooting procedures below as
instructed.
Procedure 1 Power Icon Check
Procedure 2 Connection Check
Procedure 3 Replacement Check
Procedure 1 Power Icon Check
The following two power LEDs indicate the power supply status:
􀂉 Battery LED
􀂉 DC IN LED
The power supply controller displays the power supply status through the Battery and DC IN
LEDs as in the tables below.
􀂉 Battery LED














If the DC IN LED off, follow the steps below:
1. Remove the battery pack and the AC adapter to shut off power supply to the
computer.
2. Attach the battery and AC adapter back again.
If the LED still off, follow the steps below:
Check 1 Make sure the DC IN LED goes on in Blue. If it does not, go to Procedure 2.
Check 2 Make sure the Battery LED goes on in Amber or Blue. If it does not, go to
Procedure 3.



Follow the steps below to check whether each connector has been connected correctly:
Check 1 Make sure the AC adaptor and AC power cord have been firmly plugged
into the DC IN 19V socket and wall outlet, respectively. When they have
been connected correctly, perform Check 2.
Check 2 Connect a new AC adaptor and AC power cord.
• If the DC IN LED does not go on, go to Procedure 3.
• If the battery LED does not go on, perform Check 3.
Check 3 Make sure the battery pack has been correctly installed in the computer.
If the battery LED does not go on while the battery pack has been installed
correctly, go to Procedure 3.
Procedure 3 Replacement Check
The system board, power supply board, or CPU may be faulty. Disassemble the computer
according to Chapter 4 and follow the steps below:
Check 1 Replace the power supply board with a new one. If the battery pack is still
not working properly, perform Check 2.
Check 2 Replace the system board with a new one. If the battery pack is still not
working properly, perform Check 3.
Check 3 Replace the CPU with a new one.