Lenovo A2107ah Service Manual

							Important service information
17
Use the following strategy to prevent unnecessary expense for replacing and 
servicing FRUs:
 If you are instructed to replace an FRU, but the replacement does not solve 
the problem, reinstall the original FRU before you continue.
 Some computers have both a processor board and a system board. If you are 
instructed to replace either of them, and replacing one of them does not solve 
the problem, reinstall that board, and then replace the other one.
 If an adapter or a device consists of more than one FRU, any of the FRUs may 
be the cause of the error. Before replacing the adapter or device, remove the 
FRUs one by one to see if the symptoms change. Replace only the FRU that 
changed the symptoms.
Attention: The setup configuration on the computer you are servicing may have 
been customized. Running Automatic Configuration may alter the settings. Note 
the current configuration settings (using the View Configuration option); then, 
when service has been completed, verify that those settings remain in effect.
Important notice for replacing a system board
Some components mounted on a system board are very sensitive. Improper 
handling can cause damage to those components, and may cause a system 
malfunction.
Attention: When handling a system board:
 Do not drop the system board or apply any excessive force to it.
 Avoid rough handling of any kind.
 Avoid bending the system board and hard pushing to prevent cracking at 
each BGA (Ball Grid Array) chipset. 
						

							Lenovo IdeaTab A2107A Hardware Maintenance Manual
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RoHS, The Restriction of Hazardous Substances in Electrical and 
Electronic Equipment Directive (2002/95/EC) is a European Union legal 
requirement affecting the global electronics industry. RoHS requirements 
must be implemented on Lenovo products placed on the market after June 
2006. Products on the market before June 2006 are not required to have 
RoHS compliant parts. If the original FRU parts are non-compliant, 
replacement parts can also be non-compliant. In all cases if the original 
FRU parts are RoHS compliant, the replacement part must also be RoHS 
compliant.
Note: RoHS and non-RoHS FRU part numbers with the same fit and function are 
identified with unique FRU part numbers.
Lenovo plans to transit to RoHS compliance well before the implementation date 
and expects its suppliers to be ready to support Lenovo’s requirements and 
schedule in the EU. Products sold in 2005 and 2006 will contain some RoHS 
compliant FRUs. The following statement pertains to these products and any 
product Lenovo produces containing RoHS compliant FRUs.
RoHS comp lian t FRU s h ave u niqu e FRU  p art  nu mbers. Before or a ft er t he RoHS 
implementation date, failed RoHS compliant parts must always be replaced with 
RoHS compliant ones, so only the FRUs identified as compliant in the system 
HMM or direct substitutions for those FRUs may be used.
Note: A direct substitution is a part with a different FRU part number that is 
automatically shipped by the distribution center at the time of the order.
Products marketed before June 2006Products marketed after June 2006
Current or 
original partReplacement 
FRUCurrent or 
original partReplacement 
FRU
Non-RoHSCan be Non-RoHS
Must be RoHSMust be RoHSNon-RoHSCan be RoHS
Non-RoHSCan sub to RoHS
RoHSMust be RoHS
Important information about replacing RoHS compliant FRUs 
						

							General checkout
19
This chapter presents the following information:
 “What to do first” on page 20
 “Power system checkout” on page 21
Before you go to the checkout, make sure to read the following important notes:
General checkout
Important notes:
•Only certified trained personnel can service the computer.
Before replacing any FRU, read the entire page on removing and 
replacing FRUs.
When you replace FRUs, use new nylon-coated screws.
Be extremely careful during such write operations as copying, 
saving, or formatting. Drives in the computer that you are servicing 
sequence might have been altered. If you select an incorrect drive, data 
or programs might be overwritten.
Replace an FRU only with another FRU of the correct model. When 
you replace an FRU, make sure that the machine model and the FRU part 
number are correct by referring to the FRU parts list. 
An FRU should not be replaced just because of a single, 
unreproducible failure. Single failures can occur for a variety of reasons 
t hat  have n oth ing to do  with  a hardware defect , s u ch  as cos mic ra diat ion, 
electrostatic discharge, or software errors. Consider replacing an FRU 
only when a problem recurs. If you suspect that an FRU is defective, 
clear the error logs and run the test again. If the error does not recur, do 
not replace the FRU.
Be careful not to replace a nondefective FRU. 
						

							Lenovo IdeaTab A2107A Hardware Maintenance Manual
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When you do return an FRU, you must include the following information in the 
parts exchange form or parts return form that you attach to it:
1. Name and phone number of servicer
2. Date of service
3. Date on which the machine failed
4. Date of purchase
5. Procedure index and page number in which the failing FRU was detected
6. Failing FRU name and part number
7. Machine type, model number, and serial number
8. Customer’s name and address
Note for warranty: During the warranty period, the customer may be 
responsible for repair costs if the computer damage was caused by misuse, 
accident, modification, unsuitable physical or operating environment, or 
improper maintenance by the customer.
The following is a list of some common items that are not covered under 
warranty and some symptoms that might indicate that the system was subjected 
to stress beyond normal use.
Before checking problems with the computer, determine whether the damage is 
covered under the warranty by referring to the following list:
The following are not covered under warranty:
 LCD panel cracked from the application of excessive force or from being 
dropped
 Scratched (cosmetic) parts
 Distortion, deformation, or discoloration of the cosmetic parts
 Plastic parts, latches, pins, or connectors that have been cracked or broken by 
excessive force
 Damage caused by liquid spilled into the system
 Damage caused by the improper insertion of a PC Card or the installation of 
an incompatible card
 Improper disk insertion or use of an optical drive
 Diskette drive damage caused by pressure on the diskette drive cover, foreign 
material in the drive, or the insertion of a diskette with multiple labels
 Damaged or bent diskette eject button
 Fuses blown by attachment of a nonsupported device
 Forgotten computer password (making the computer unusable)
 Sticky keys caused by spilling a liquid onto the keyboard
 Use of an incorrect AC adapter on laptop products
The following symptoms might indicate damage caused by nonwarranted 
activities:
 Missing parts might be a symptom of unauthorized service or modification. 
 If the spindle of a hard disk drive becomes noisy, it may have been subjected 
to excessive force, or dropped.
What to do first 
						

							General checkout
21
To verify a symptom, follow the steps below:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the AC adapter.
4. Make sure 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. Make sure that the battery pack supplies power when you turn on the 
computer.
If you suspect a power problem, see the appropriate one of the following power 
supply checkouts:
 “Checking the IdeaTab AC Charger” on page 21
 “Checking the internal battery status” on page 21
Checking the IdeaTab AC Charger
When you use the IdeaTab AC Charger to charge the tablet but no power is 
charged, see the instructions in this topic to check the IdeaTab AC Charger.
To check the IdeaTab AC Charger, do the following:
1. Disconnect the micro-USB cable from the tablet.
2. Measure the output voltage across the connector marked B of the micro-USB 
cable. Refer to the following figure:
Note: The output voltage across pin 3 of the micro-B connector might be 
different from the one you are servicing.
3. If the voltage is not correct, replace the micro-USB cable.
4. If the voltage is acceptable, replace the system board.
Checking the internal battery status
To check the battery status of the tablet, do either of the following:
Approximate information about the battery status
Get the approximate status of the battery at any time by checking the battery 
status icon on the system bar in the upper-right corner of the screen. The 
shorter the green bar is, the less the battery power remains.
Accurate information about the battery status
To get the accurate information about the battery status of the tablet, do the 
following:
Power system checkout
Pin
Voltage (V dc)
1
Ground
20
3+5
12 3 (5V) 
						

							Lenovo IdeaTab A2107A Hardware Maintenance Manual
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1. Open the Android Settings screen.
To open the Android Settings screen, do either of the following:
– From the main Home screen, touch the Android Settings icon on 
Lenovo Launch Zone. The Android Settings screen is displayed.
– Touch the application icon from the action bar and then touch Settings. 
The Android Settings screen is displayed.
2. Touch About Tablet on the Android Settings screen.
3. Touch Status to view the accurate percentage of the remaining battery 
power. You also can touch Battery use to check what applications are 
consuming battery power. 
						

							Related service information
23
This chapter presents the following information:
 “Security” on page 23
 “Power management” on page 23
Security settings include: SCREEN SECURITY, SIM CARD LOCK (3G version 
only), PASSWORDS, DEVICE ADMINISTRATION and CREDENTIAL 
STORAGE.
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.
Activating/Deactivating the Display
With the display deactivated, press the Power button on the IdeaTab to activate 
the display. The IdeaTabs display will then illuminate, indicating that it has 
been activated.
If you do not need to use your IdeaTab temporarily, you can press the Power 
button to deactivate the display. Your IdeaTab will then enter standby mode to 
save power.
Related service information
Security
Power management 
						

							Lenovo IdeaTab A2107A Hardware Maintenance Manual
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This chapter presents the following product-specific service references and 
product-specific parts information:
 “Specifications” on page 24
 “FRU replacement notices” on page 25
 “Removing and replacing an FRU” on page 26

 “Parts list” on page 41
The following table lists the specifications of the Lenovo IdeaTab A2107A:
Table 1. Specifications
FeatureDescription
Form Factor
Size  192mm × 121.8mm × 11.5mm
Weight  Appr. 400g
System
Platform  MTK 6575 1GHz
Memory  1GB
LCD  7.0” (1024 × 600 Widescreen view)
Integrated Camera  0.3M on front/2.0M on back
Battery  1-cell Li-polymer battery
Operating System
 Android 4.0.3
Ports
 SIM card slot (Select models only)
 Earphone/microphone x 1
 Data/Power jack
 Micro SD card
Communication

 Bluetooth

Others
 Multi-touch supported
 Built-in microphone


Lenovo IdeaTab A2107A
Specifications 
						

							Lenovo IdeaTab A2107A
25
This section presents notices related to removing and replacing parts. Read this 
section carefully before replacing any FRU.
Screw notices
Loose screws can cause a reliability problem. In the Lenovo computer, this 
problem is addressed with special nylon-coated screws that have the following 
characteristics:
 They maintain tight connections.
 They do not easily come loose, even with shock or vibration.
 They are harder to tighten.
 Each one should be used only once.
Do the following when you service this machine:
 Keep the screw kit in your tool bag.
 Always use new screws.
 Use a torque screwdriver if you have one.
Tighten screws as follows:
Plastic to plastic
Turn an additional 90° after the screw head touches the surface of the plastic 
part:
Logic card to plastic
Turn an additional 180° after the screw head touches the surface of the logic 
card:
Torque driver
If you have a torque screwdriver , refer to the “Torque” column for each step.
 Make sure that you use the correct screws. If you have a torque screwdriver, 
tighten all screws firmly to the torque shown in the table. Never use a screw 
that you removed. Use a new one. Make sure that all screws are 
tightened firmly.
 Ensure torque screwdrivers are calibrated correctly following country 
specifications.
FRU replacement notices
more than 90°
(Cross-section)
more than 180°
(Cross-section) 
						

							Lenovo IdeaTab A2107A Hardware Maintenance Manual
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This section presents exploded figures with the instructions to indicate how to 
remove and replace the FRU. Make sure to observe the following general rules:
1. Do not attempt to service any computer unless you have been trained and 
certified. An untrained person runs the risk of damaging parts.
2. Before replacing any FRU, review “FRU replacement notices” on page 25.
3. Begin by removing any FRUs that have to be removed before the failing FRU. 
Any of such FRUs are listed at the top of the page. Remove them in the order 
in which they are listed.
4. Follow the correct sequence in the steps to remove the FRU, as given in the 
figures by the numbers in square callouts.
5. When turning a screw to replace an FRU, turn it in the direction as given by 
the arrow in the figure.
6. When removing the FRU, move it in the direction as given by the arrow in the 
figure.
7. To put the new FRU in place, reverse the removal procedures and follow any 
of the notes that pertain to replacement. For information about connecting 
and arranging internal cables, see “Locations” on page 38.
8. When replacing an FRU, use the correct screw as shown in the procedures.
Attention: After replacing an FRU, do not turn on the computer until you have 
made sure that all screws, springs, and other small parts are in place and none 
are loose inside the computer. Verify this by shaking the computer gently and 
listening for rattling sounds. Metallic parts or metal flakes can cause electrical 
short circuits.
Attention: The system board is sensitive to, and can be damaged by, electrostatic 
discharge. Before touching it, establish personal grounding by touching a 
ground point with one hand or using an electrostatic discharge (ESD) strap 
(P/N 6405959) to remove potential shock reasons.
Removing and replacing an FRU
DANGER
Before removing any FRU, turn off the computer, unplug all power cords 
from electrical outlets, remove the battery pack, and then disconnect any of 
the interconnecting cables.