Tuesday, March 01, 2016

LENOVO NOTEBOOK - LENOVO 3000 N100 - N200 – AC adapter checking procedure - Passwords reset – Battery pack checking procedure - Optional charger testing – Laptop repair and service

Category: Laptop Repair and Service 

Contents of this article 

  • AC adapter Testing procedure 
  • Battery pack testing procedure 
  • Passwords resetting  


LENOVO 3000 N100 - N200

How to remove the power-on password
To remove a POP that you have forgotten, do the following:
(A) If no SVP has been set:
1. Turn off the computer.
2. Remove the battery pack.
3. Remove the DIMM slot cover.
4. Remove the DIMM.
5. Short J1 pad

6. Reinstall the DIMM and the DIMM slot cover.
7. Reinstall the battery pack.
8. Turn on the computer and wait until the POST ends.
After the POST ends, the password prompt does not appear. The POP has been removed.
(B) If an SVP has been set and is known by the servicer:
1. Turn on the computer; then, while the initial screen is displayed, press the Lenovo CareSM button. The Rescue and Recovery screen opens.
2. Click Access BIOS. The System Restart Required window is displayed.
3. Click Yes. The computer restarts, and the BIOS Setup Utility screen opens.
4. Select Security, using the cursor directional keys to move down the menu.
5. Select Password.
6. Select Power-On Password*1.
7. Type the current SVP in the Enter Current Password field. Then leave the Enter
New Password field blank, and press Enter twice.
8. In the Changes have been saved window, press Enter.
9. Press F10; then, in the Setup confirmation window, select Yes .
Note: For some models, the BIOS menu marked *1 is User Password.
How to remove the hard-disk password
To remove a user HDP that has been forgotten, when the SVP and the master HDP are known, do the following:
1. Turn on the computer; then, while the initial screen is displayed, press the Lenovo Care button. The Rescue and Recovery screen opens.
2. Click Access BIOS. The System Restart Required window is displayed.
3. Click Yes. The computer restarts, and the BIOS Setup Utility screen opens.
4. Select Security, using the cursor directional keys to move down the menu.
5. Select Password.
6. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.
7. Select Master HDP.
8. Type the current master HDP in the Enter Current Password field. then leave the Enter New Password field blank, and press Enter twice.
9. Press F10.
10. Select Yes in the Setup Configuration window. Both user HDP and master HDP will have been removed.
Power management
Note: Power management modes are not supported for APM operating system.
To reduce power consumption, the computer has three power management modes: screen blank, sleep (standby), and hibernation.
Screen blank mode
If the time set on the “Turn off monitor” timer in the operating system expires, the LCD backlight turns off. To end screen blank mode and resume normal operation, press any key.
Sleep (standby) mode
When the computer enters sleep (standby) mode, the following events occur in addition to what occurs in screen blank mode:
# The LCD is powered off.
# The hard disk drive is powered off.
# The CPU stops.
To enter sleep (standby) mode, press Fn+F4.
In certain circumstances, the computer goes into sleep (standby) mode automatically:
# If a “suspend time” has been set on the timer, and the user does not do any operation with the keyboard, the hard disk, the parallel connector, or the diskette drive within that time.
# If the battery indicator blinks orange, indicating that the battery power is low.
(Alternatively, if Hibernate when battery becomes low has been selected in the “Power Management Properties” window, the computer goes into hibernation mode.)
To cause the computer to return from sleep (standby) mode and resume operation, do one of the following:
# Press the Fn key.
# Open the LCD cover.
# Turn on the power switch.
Also, in the following event, the computer automatically returns from sleep (standby) mode and resumes operation:
# The time set on the resume timer elapses.
Note: The computer does not accept any input immediately after it enters sleep (standby) mode. Wait a few seconds before taking any action to reenter operation mode.
Hibernation mode
In hibernation mode, the following occurs:
# The system status, RAM, VRAM, and setup data are stored on the hard disk.
# The system is powered off.
To cause the computer to enter hibernation mode, do any of the following:
# Press the Fn+F12 keys.
# If you are using the ACPI operating system and have defined one of the following actions as the event that causes the system to go into hibernation mode, perform that action.
– Closing the lid.
– Pressing the power button.
Also, the computer goes into hibernation mode automatically in either of the following conditions:
# If a “hibernation time” has been set on the timer, and if the user does not do any operation with the keyboard, the hard disk drive, the parallel connector, or the diskette drive within that time.
# If the timer conditions are satisfied in suspend mode.
When the power is turned on, the computer returns from hibernation mode and resumes operation. The hibernation file in the boot record on the hard disk drive is read, and system status is restored from the hard disk drive.
Power system checkout
To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
Checking the ac adapter
You are here because the computer fails only when the ac adapter is used.
# If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuity and installation.
# If the computer does not charge during operation, go to ″Checking operational charging.″
To check the ac adapter, do the following:
1. Unplug the ac adapter cable from the computer.
2. Measure the output voltage at the plug of the ac adapter cable. See the following figure:

Note: Output voltage of pin no.2 of the ac adapter may be different from the
one you are servicing.
3. If the voltage is not correct, replace the ac adapter.
4. If the voltage is acceptable, do the following:
# Replace the system board.
# If the problem persists.
Checking operational charging
To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer.
Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does not turn on, replace the battery pack.
If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section.
Checking the battery pack
Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life.
To check your battery, move your cursor to the Power Meter icon in the icon tray of the Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Meter icon.
Note: If the battery pack becomes hot, it may not be able to charge. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it.
To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage between battery terminals 1
(+) and 7 (−). See the following figure:

3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
Note: Recharging will take at least 3 hours, even if the indicator does not turn on.
If the voltage is still less than +11.0 V dc after recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 4 and 7. The resistance must be 4 to 30 K . If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.