Transcript tin shielding

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This presentation contains confidential information
that could not be disclosed outside Lenovo.
Please keep it confidential.
This information is subject to change without prior
notice. Lenovo reserves the right not to bring any
of these information outside Lenovo.
This presentation is for Lenovo Authorized
Service Partners (LASPs) Internal Use Only!
Introduction
Issue Description
 The end user may suffer a slow download speed
when using a wireless connection, especially
when there is a long distance between the
wireless AP and the System.
− This issue can be duplicated on all wireless LAN
cards that being supported by IdeaPad U410.
(Broadcom, Atheros, Intel )
Identify Issue
This issue only affects systems:
 The manufacturing date is on or before July 22, 2012
 The wireless throughput is slow, moving the system very close to the router
will increase the throughput speed to a normal level. But as the system is
moved farther away from the router, the throughput level will drop again. If
the notebook is moved to another room with a number of obstructions inbetween the router and itself, the throughput will drop to a very low speed.
− Several web sites provide download speed tests. Using your favorite search
engine, search for “download speed test” and choose a test site from the results.
− It is important to measure using the actual throughput speeds (i.e. download
speed), not the wireless signal strength indicator. Signal strength is not a reliable
indicator of actual wireless performance.
− If moving the system close to the wireless router does not improve the
performance, the issue at fault is different and this fix is unlikely to have any
impact.
Solution:
 If the wireless performance does follow this pattern, it will be necessary to
send the system in for service.
Preparation
System Disassembly Ability
 Before performing this workaround process, the engineer
must be familiar with the disassembly and reassembly
process of the U410, including:
−
−
−
−
Back cover
Battery
Wireless LAN card
Heat sink
For detailed disassembly process, please refer U410 Service Training
Identify Wireless Card Module
 This solution will not take effect on Broadcom wireless
LAN card (P/N 20002501) .
 If the customer’s system ships with a Broadcom card,
order and replace an Atheros card (P/N 20002524).
Broadcom Card
Atheros Card
Order Necessary Material
 Wireless LAN card
− Optional: only if customer’s system ships with a Broadcom card.
− P/N 20002524
 Tin shielding materials and mylar for the back cover
− P/N 90201849 (tin shielding)
− P/N 90201851 (mylar)
 Copper foil tape for the chassis and the system board
− P/N 90201850
Repair Process
Repairing Instructions
 Replacing wireless LAN card
− optional, if customer’s system ships with a Broadcom card.
 Taping the tin shielding materials to the back cover
 Taping the copper foil tape to their required location
 Reinstalling the wireless LAN driver
− only after replacing the wireless LAN card
Replacing the Wireless LAN card
 This is an optional step, It is only necessary if the customer’s system
ships with a Broadcom wireless LAN card (P/N 20002501)
 Replace* the Atheros card ( P/N 20002524 ) for the customer’s
sytem .
Broadcom Card
Atheros Card
*After the whole rework process, emember to reinstall the wireless LAN and Bluetooth driver.
Placing the Tin Shielding Materials
 Remove the back cover from the system.
 Tape all the tin shielding materials to the required areas.
− All materials must be taped and pressed flat, leaving no air bubbles inside
− Allow no more than a 2 mm tolerance distance between edges of tape and frame
B
D
C
A
D
B
C
A
tin shielding materials
P/N 90201849
mylar
P/N 90201851
Tin Shielding – Piece A
 Align the top and left edge of Piece A with the plastic frame.
 Make sure the cut out slot aligned with the heat louver area.
Aligned with the heat louver area
A
Tin Shielding – Piece B
 Align the top edge of Piece B with the plastic frame.
 Align the left edge of Piece B with the right edge of Piece A.
B
A
A
Tin Shielding – Piece C
 To dust-proof the tin shielding, additional mylar need to be added to
the heat louver area.
− Directly tape the mylar to Piece C first.
− Align and tape Piece C with the mylar to the back cover (next slide)
Adhesive side
Tape the mylar to the tin shielding
Tin Shielding – Piece C (Cont’d)
 Align the top edge of Piece C with the bottom edge of Piece B.
 Keep the left edge of Piece C and the right edge of the cut-out slot
on the plastic frame in the same line
Cut-out slot on the frame
Keep in same line
B
C
A
Tin Shielding – Piece D
 Align the top edge of Piece D with the bottom edge of the white tape.
 Align the left edge of Piece D with the plastic frame.
B
D
C
Placing the Copper Foil Tape
 Before placing the copper foil tape.
− Disconnect battery cable and remove the heat sink.
− For detailed disassembly process, please refer U410 Service Training
 Place all copper foil tape to their corresponding areas.
A
B
A
B
copper foil tape
P/N 90201850
Copper Foil Tape – Piece A





Remove the screw and the manufactory label as Marked
Align the left edge of the major piece with the edge of system board
Align the top-left edge of the major piece with the latch
Tape the right side to the grounding area on the power button board
Keep the power button board cable under the copper tape
Remove this screw
The latch
Remove this label
Power button cable
Grounding area
Copper Foil Tape – Piece A ( Cont’d )




Align the round cut-out of the minor part with the screw hole
Make sure to contact the minor piece to the major piece
DO NOT cover the wireless antenna
Restore the screw to the finish this step
Align with the screw hole
Contact the 2 pieces
Copper Foil Tape – Piece B
 Tape the Piece B along the power connector.
 Make sure the tape contact to the grounding pin of the Ethernet connector.
 Place the rest of the tape to the Ethernet connector
Grounding pin
Reinstall the Drivers
 This is an optional step. However, it must be
followed if the wireless LAN card mentioned on
Page 12 is replaced.
− Uninstall the old wireless LAN and Bluetooth
drivers
− Reinstall the latest ( Rev. 9.2.0.462 driver or later )
for the new wireless LAN and Bluetooth card