• The product-specific section includes service, reference, and product-specific parts information. Important: • This manual is intended only for trained service technicians who are familiar with Lenovo products. Use this manual to troubleshoot problems effectively. • Before servicing a Lenovo product, be sure to read all the information under Chapter 1 “Safety information”...
Electrical safety Observe the following rules when working on electrical equipment. Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges.
4. Check for cracked or bulging batteries. 5. Remove the cover. 6. Check for any obvious non-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo alterations. 7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage.
2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective. When handling ESD-sensitive parts: • Keep the parts in protective packages until they are inserted into the product. • Avoid contact with other people. •...
Laser compliance statement (multilingual translations) The laser compliance statements in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese Chapter 1 Safety information...
After a system board is replaced, ensure that the latest BIOS is installed to the system board before completing the service action. To download software fixes, drivers, and BIOS, do the following: 1. Go to http://www.lenovo.com/support. 2. Click Download Drivers & Software. The Web site offers three options to begin your search: • Search by product number •...
Note: RoHS and non-RoHS FRU part numbers with the same fit and function are identified by the unique FRU part numbers. Lenovo plans to transit to RoHS compliance before the implementation date and expects its suppliers to be ready to meet Lenovo’s requirements and schedule in the European Union. Products sold between 2005 and 2006 might contain some RoHS compliant FRUs.
3. If the voltage is not correct, replace the ac power adapter. 4. If the voltage is acceptable, do the following: • Replace the system board. • If the problem persists, go to Chapter 5 “Lenovo B490” on page 37. Hardware Maintenance Manual...
• Windows 7: Open the Power Manager program and click the Battery tab. • Windows 8: – On the Windows operating system, press the recovery button to launch the Lenovo Solution Center program, and then click Battery. – Press Fn+Esc to launch the Lenovo Experience program, and then click Battery Health.
Page 38
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 5 and 7. The resistance must be 4 to 30 K Ω. If the resistance is not correct, replace the battery pack.
If any of these passwords has been set, a prompt for it will be displayed on the screen whenever the computer is turned on. The computer does not start until the password is entered. Note: If only a supervisor password is set, the password prompt will not be displayed when the operating system is started.
Also, when the time set on the resume timer elapses, the computer automatically returns from sleep mode and resumes operation. Note: The computer does not accept any input immediately after it enters sleep mode. Wait a few seconds before taking any action to reenter operation mode. Hibernation mode In hibernation mode, the following occurs: •...
“Status indicators” on page 38 • “Fn key combinations” on page 39 Specifications This topic lists the physical features for the Lenovo B490 models. Processor • Windows 7: To view the system properties of your computer, click Start, right-click Computer; then click Properties.
Optical drive • 12.7 mm Rambo optical drive Wireless features • Integrated wireless LAN • Integrated Bluetooth (on some models) • Integrated WiMAX • 100/1000 Mbps Ethernet communication Security feature Fingerprint Reader (on some models) Status indicators This chapter presents the system status indicators that show the status of the computer. Table 1.
Multimedia control: Skip to the next track Fn+PgUp Enables or disables the scroll lock function. Fn+PrtSc Has the same function as the SysRq key on a conventional keyboard. Fn+Home Has the same function as the Pause key on a conventional keyboard. Chapter 5 Lenovo B490...
Page 46
Table 2. Function key combinations (continued) Key combination Description Fn+End Has the same function as the Break key on a conventional keyboard. Fn+PgDn Activates the insert function. Increases or decreases the display brightness level. Fn + up/down arrow Fn + left/right arrow Increases or decreases the sound volume.
Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at http://www.lenovo.com/UserManuals.
Page 48
• Torque driver If you have a torque screwdriver, refer to the Torque column in the screw information table for each step. • Make sure that you use the correct screw. It is recommended to use new screws for replacements. If you have a torque screwdriver, tighten all screws firmly to the torque specified in the screw information table for each step.
Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at http://www.lenovo.com/UserManuals.
1010 Battery pack Removal steps of battery pack DANGER Use only the battery specified in the parts list for your computer. Any other battery could ignite or explode. Unlock the spring-loaded battery latch . Holding the manual battery latch in the unlocked position, remove the battery pack in the direction shown by the arrow When installing: Install the battery pack in the slot.
Removal steps of bottom slot cover Remove the screws , and then remove the cover Step Screw (quantity) Color Torque Black 1.85 kgf-cm M2 × 3 mm, flat-head, nylon-coated (2) 1030 Optical drive For access, remove these FRUs in order: •...
Insert a screwdriver into the screw hole and push the optical drive in the direction shown by the arrow Then remove the optical drive. Removal steps of optical drive bezel and optical drive bracket Remove the screws and then remove the optical drive bracket. Torque Step Screw (quantity)
Removal steps of memory modules Release the two latches on both edges of the socket at the same time in the direction shown by the arrows , and then unplug the memory module in the direction shown by the arrow Note: If only one memory module is used on the computer you are servicing, the card must be installed in SLOT-0 ( : lower slot), but not in SLOT-1 (...
Page 54
Removal steps of hard disk drive assembly Remove the screw , then pull the tab in the direction shown by the arrow Step Screw (quantity) Color Torque M2 × 3 mm, flat-head, nylon-coated (1) Black 1.85 kgf-cm Remove the hard disk drive from the slot When installing: Make sure that the hard disk drive connector is attached firmly.
Remove the hard disk drive bracket as shown by the arrow 1060 PCI Express Mini Card for wireless LAN For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 Removal steps of PCI Express Mini Card for wireless LAN In steps , disconnect the cables from the card using the removal tool antenna RF connector (P/N: 08K7159)
Remove the card in the direction shown by the arrow When installing: Plug the black cable (MAIN) into the jack labeled A, and the white cable (AUX) into the jack labeled B on the card. 1070 mSATA solid state drive For access, remove these FRUs in order: •...
Remove the mSATA solid state drive 1080 Backup battery For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 Removal steps of backup battery DANGER Use only the battery specified in the parts list for your computer. Any other battery could ignite or explode.
Removal steps of keyboard Remove the screws When installing: Ensure that the screws have been fastened to secure the keyboard. Step Screw (quantity) Color Torque Black M2.5 × 8 mm, flat-head, nylon-coated (3) 4.0 kgf-cm Push hard in the direction shown by the arrow to unlatch the front side of the keyboard.
Remove the keyboard in the direction shown by the arrow Carefully lift the keyboard until you can see how it’s connected. Hold the keyboard above the computer and then detach the keyboard connector. Chapter 7 Removing and replacing a FRU...
1100 Keyboard bezel For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 • “1030 Optical drive” on page 45 • “1090 Keyboard” on page 51 Removal steps of keyboard bezel Remove the screws that secure the keyboard bezel.
Page 61
Remove the screw Torque Step Screw (quantity) Color M2 × 6 mm, flat-head, nylon-coated (1) Black 1.85 kgf-cm Detach the connectors. When installing: Ensure that all the connectors are attached firmly. Chapter 7 Removing and replacing a FRU...
Remove the keyboard bezel. 1110 LED board For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 • “1030 Optical drive” on page 45 • “1090 Keyboard” on page 51 •...
Removal steps of LED board Peel off the mylar tape . Then remove the LED board 1120 Power board For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 •...
Removal steps of power board Remove the screw and then remove the power board Torque Step Screw (quantity) Color M2 × 3 mm, flat-head, nylon-coated (1) Black 1.85 kgf-cm 1130 Microphone assembly For access, remove these FRUs in order: • “1010 Battery pack”...
1140 I/O board For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 • “1030 Optical drive” on page 45 • “1090 Keyboard” on page 51 • “1100 Keyboard bezel” on page 54 Removal steps of I/O board Remove the screws , and then detach the cable.
Remove the I/O board 1150 System board assembly and USB board Important notices for handling the system board: When handling the system board, bear the following in mind: • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite. •...
Page 67
Removal steps of system board assembly and USB board Remove the screws , and then detach the connectors as shown in the following illustration. Step Screw (quantity) Color Torque M2 × 6 mm, flat-head, nylon-coated (2) Black 1.85 kgf-cm When installing: Ensure that all the connectors are attached firmly. Remove the system board in the direction shown by the arrow .
Remove the USB board as shown in the following illustration. 1160 Thermal module For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 • “1030 Optical drive” on page 45 •...
Page 69
Removal steps of thermal module Detach the fan connector When installing: Ensure that the connector is attached firmly. Loosen the screws Chapter 7 Removing and replacing a FRU...
Page 70
Lift the fan assembly in the direction shown by the arrow Note: Be careful not to damage the connector. Hardware Maintenance Manual...
When installing: Before you attach the thermal module to the computer, apply thermal grease, at an amount of 0.2 grams, on the part marked as shown in the following illustration. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component. For models with a discrete thermal module For models with an integrated thermal module 1170 CPU...
• “1100 Keyboard bezel” on page 54 • “1130 Microphone assembly” on page 58 • “1150 System board assembly and USB board” on page 60 • “1160 Thermal module” on page 62 Attention: The CPU is extremely sensitive. When you service the CPU, avoid any kind of rough handling. Removal steps of CPU Rotate the head of the screw in the direction shown by the arrow to release the lock, then remove the...
Page 73
• “1140 I/O board” on page 59 • “1150 System board assembly and USB board” on page 60 Removal steps of LCD unit Release the antenna cables from the cable guides. Then remove the screws Step Screw (quantity) Color Torque M2.5 ×...
Remove the LCD unit in the direction shown by the arrow 1190 Speaker assembly For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1020 Bottom slot cover” on page 44 • “1030 Optical drive” on page 45 •...
Removal steps of speaker assembly Remove the screws . Then remove the speaker assembly Step Screw (quantity) Color Torque M2.5 × 5.7 mm, flat-head, nylon-coated (4) Black 4.0 kgf-cm 1200 DC-in connector and base cover For access, remove these FRUs in order: •...
Page 76
Removal steps of DC-in connector and base cover Remove the screws , and then remove the DC-in connector in the direction shown by the arrow Step Screw (quantity) Color Torque M2 × 3 mm, flat-head, nylon-coated (2) Black 1.85 kgf-cm Applying labels to the base cover The new base cover is shipped with a kit containing labels of several kinds.
Indonesia D side label Israel label Wireless WAN IMEI barcode label Israel label Brazil Bluetooth label / Bluetooth label for United Malaysia SIRIM label States/Canada/Taiwan PRC / MTM label / KCC label / Mexico label/MAC label Vodafone label Brazil Wireless LAN label / Wireless LAN label for Rating label United States/Canada/Taiwan PPT label...
Removal steps of LCD front bezel Remove the screws Step Screw (quantity) Color Torque M2 × 3.5 mm, flat-head, nylon-coated (2) Black 1.85 kgf-cm Remove the LCD front bezel in the direction shown by the arrows When installing: Ensure that all the latches are attached firmly. Then secure the bezel with the screws. 2020 Camera For access, remove these FRUs in order: •...
Removal steps of camera Remove the camera from the LCD cover as shown in the following illustration. Note: The camera is stuck on the top center of the LCD cover. When installing: Stick the camera to the top center of the LCD cover and adjust the placement to make sure that the connector is attached firmly.
Page 80
Removal steps of LCD panel and LCD cable Remove the screws . Then remove the LCD panel with hinges in the direction shown by the arrow Remove the screws . Then remove the hinges Step Screw (quantity) Color Torque M2 × 3.5 mm, flat-head, nylon-coated (4) White 1.85 kgf-cm Hardware Maintenance Manual...
Remove the LCD cable. When installing: Ensure that the cable is attached firmly. 2040 Antenna assembly and LCD rear cover For access, remove these FRUs in order: • “1010 Battery pack” on page 44 • “1180 LCD unit” on page 66 •...
Chapter 8. Locations This chapter presents the locations of the Lenovo B490 hardware components. Front view Figure 1. Lenovo B490 front view Integrated camera (on some models) Touch pad and touch pad buttons Wireless module antennas Power and battery indicator...
CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request.
— ac power adapter (see “ac power adapters” on page 88.) LCD FRUs In Lenovo B490 models, the type of LCD is 14-inch high definition (HD) TFT LCD (Table 4 “Parts list - LCD” on page 84). Chapter 9 Parts list...
Page 90
Table 4. Parts list - LCD No. FRU FRU no. LB49A LCD Bezel W/Camera Hole 90201838 90201839 LB49A LCD Bezel WO/Camera Hole LB48 Hinge R+L 6K.4TFCS.001 90200760 90000238 LB58 Camera 0.3M LB48 Antenna R 25.90AAL.001 90200764 LB49A LCD Cover 90201835 LB48 Antenna L 25.90AAK.001 90200763 Panel, 14.0 HD Flat Glossy, AUO, B140XW01 V8...
36200032 Chicony Power HP-BT090E13LF, EPA model Power cords A Lenovo power cord for a specific country or region is usually available only in that country or region. Table 13. Parts list - 3-pin power cords (Linetek) FRU no. Country or region...
Page 96
Table 13. Parts list - 3-pin power cords (Linetek) (continued) FRU no. Country or region 145000597 Switzerland • LINETEK LS15+H03VV-F+LP-37 1 m Taiwan 145000588 • LINETEK LS15+VCTF+LP-53 1 m U.K. 145000593 • LINETEK LP-61L+ H03VV-F+ LS15 1 m 145000594 • LINETEK LP-30B + SPT-2 + LS15 1 m Table 14.
Page 97
Table 14. Parts list - 3-pin power cords (Longwell) (continued) FRU no. Country or region Taiwan 145000556 • Longwell LP-71+VCTF+LS-33 1 m U.K. 145000561 • Longwell LP-61L+H03VV-F+LS-18 1 m 145000562 • Longwell LP-30B+SPT-2 18AWG+LS-18 1 m Table 15. Parts list - 3-pin power cords (Volex) Country or region FRU no.
Page 98
Table 15. Parts list - 3-pin power cords (Volex) (continued) FRU no. Country or region U.K. 145000605 • VOLEX MP5004+H03VV-F+VAC5S 1 m 145000537 • Volex US15S3+SPT-2 +VAC5S 1 m Table 16. Parts list - 2-pin power cords (Linetek) Country or region FRU no.
Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead.
For electronic emission information on Class B digital devices, refer to the corresponding information in the User Guide. Trademarks The following terms are trademarks of Lenovo in the United States, other countries or both: Lenovo OneKey Windows is the trademark of the Microsoft group of companies.
Page 102
Part Number: Printed in China (1P) P/N: *1P*...