Checking operational charging, Pin Voltage V dc | Lenovo 33472YU

To check the ac power adapter, do the following:

1.Unplug the ac power adapter cable from the computer.

2.Measure the output voltage at the plug of the ac power adapter cable. See the following illustration:

3

2

1

(20V)

Pin	Voltage (V dc)

1+20

20

3Ground

Note: Output voltage across pin 2 of the ac power adapter might differ from the one you are servicing.

3.If the voltage is not correct, replace the ac power adapter.

4.If the voltage is acceptable, replace the system board.

Note: Noise from the ac power adapter does not always indicate a defect.

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, 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

The battery status icon in the Windows notification area displays the percentage of battery power remaining.

To check for detailed battery status information, do the following:

•For Windows 7: Open the Power Manager program and click the Battery tab.

•For Windows 8: Open the Lenovo Support program and click Battery Health, or open the Lenovo Settings program and click Power.

Checking the backup battery

To check the backup battery, do the following:

1.Disable the built-in battery. See “Disabling the built-in battery” on page 58.

2.Remove the backup battery (see “1050 Keyboard bezel, backup battery, and speaker assembly” on page 66).

3.Measure the voltage of the backup battery. See the following illustration.

Wire	Voltage (V dc)

Red	+2.5 to +3.2

Black	Ground

• If the voltage is correct, replace the system board.

Chapter 3. General checkout 29

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Lenovo 33472YU Checking operational charging, Checking the battery pack, Checking the backup battery, Pin Voltage V dc

Contents

ThinkPad S230u Hardware Maintenance Manual First Edition September Copyright Lenovo Contents Appendix A. Notices Iii About this manual Iv Hardware Maintenance Manual General safety Safety information Electrical safety Safety inspection guide Grounding requirements Safety notices multilingual translations Safety information Hardware Maintenance Manual Safety information Perigo Perigo Vorsicht Vorsicht Vorsicht Safety information Hardware Maintenance Manual Safety information Hardware Maintenance Manual Safety information Hardware Maintenance Manual Safety information Hardware Maintenance Manual Select Drivers & Software Important service informationBefore replacing parts Strategy for replacing FRUs Important notice for replacing a system board How to use error messageDynamic Configure To Order CTO Custom Model Variant CMV Using PEWClick Warranty & Services Click Check Warranty Status FRU identification for CTO, CMV, and GAV products Click Product & Parts Detail Click Parts & Accessories What to do first General checkout Quick test programs Lenovo Solution CenterFollowing are not covered under warranty Checkout guide Tests Tools Uefi diagnostic programBootable diagnostic programs Click Lenovo Bootable Diagnostics Power system checkoutChecking the ac power adapter Checking operational charging Checking the battery packChecking the backup battery Wire Voltage V dc Hardware Maintenance Manual Restoring the factory contents by using Recovery Disc Set Related service information Refreshing the computer Hard-disk password PasswordsPower-on password Select Power-On Password Supervisor passwordHow to remove the power-on password How to remove the hard-disk password Select Master HDP Power managementSleep mode Hibernation mode Numeric error codes Wireless off modeSymptom-to-FRU index 0199 Run the ThinkPad Setup program, and then save Symptom or error FRU or action, in sequence 01890190 Charge the battery pack 0191 Run the ThinkPad Setup program, and then save Beep symptoms Error messagesNo-beep symptoms Reseat the LCD connectors LCD-related symptomsIntermittent problems Undetermined problems Hardware Maintenance Manual Indicator Meaning Status indicators Indicator Meaning Special key Description Special keys Special key Description Front view Locating computer controls, connectors, and indicatorsLocations Locating FRUs and CRUs Rear viewBottom view CRU statement for customers Major FRUs and CRUs Description Self-service CRU Optional-service CRU LCD FRUs Hinge Button board Looking up FRU information Hardware Maintenance Manual Logic card to plastic FRU replacement noticesScrew notices Plastic to plastic MTM on rear label Retaining serial numbersRestoring the serial number of the system unit Product ID on rear label Retaining the UuidReading or writing the ECA information Hardware Maintenance Manual General guidelines Removing or replacing a FRU Hard disk drive or solid-state drive Disabling the built-in batteryBefore servicing the computer Removing the SIM card Removing or replacing a FRU Step Screw quantity Color Torque KeyboardRemoval steps of keyboard Removing or replacing a FRU When installing PCI Express Mini Card for wireless LAN Removal steps of PCI Express Mini Card for wireless LAN Removal steps of PCI Express Mini Card for wireless WAN Removal steps of mSATA solid-state drive Step Screw cap Screw quantity Color Torque Keyboard bezel, backup battery, and speaker assemblyRemoval steps of keyboard bezel M2 × 3 mm, wafer-head, nylon-coated Silver 181 Nm Kgf-cm Hardware Maintenance Manual Battery pack Proximity sensors Important notices for replacing a battery pack Removal steps of proximity sensors Removal steps of thermal fan assembly LCD unit Removal steps of LCD unit When installing M2.5 × 3 mm, wafer-head, nylon-coated Silver 181 Nm Kgf-cm Removal steps of DC-in connector DC-in connector Important notices for handling the system board System board and base cover assemblyRemoval steps of system board and base cover assembly Applying labels to the base cover Following illustration shows the location of each label Removal steps of button bezel Button bezelLCD panel Removal steps of LCD panel Button board Removal steps of button board Integrated camera Removal steps of hinge HingeRemoval steps of integrated camera When installing Removal steps of wireless antenna assembly Removing or replacing a FRU Hardware Maintenance Manual Appendix A. Notices Trademarks Electronic emissions noticesPage 1P0B48943