Lenovo A316 User manual

1
Lenovo A316
Trouble Shooting Guide
LENOVO

2
Manu
1. The assemble & tear down.............................................Помилка! Закладку не визначено.
1.1 Tear down......................................................................................................................3
1.2 Assemble.......................................................................................................................8
2. M/B Component Location .............................................Помилка! Закладку не визначено.
2.1 Top ................................................................................................................................9
2.2 Bottom.........................................................................................................................11
3. Analysis flowchart .........................................................Помилка! Закладку не визначено.
3.1 Boot fail ......................................................................................................................13
3.2 Touch panel fail..................................................Помилка! Закладку не визначено.
3.3 Charging fail ......................................................Помилка! Закладку не визначено.
3.4 Speak fail.....................................................................................................................16
3.5 No ring...............................................................Помилка! Закладку не визначено.
3.6 LCM fail.............................................................Помилка! Закладку не визначено.
3.7 The mobile is frozen ..........................................Помилка! Закладку не визначено.
3.8 Power key & side key fail..................................Помилка! Закладку не визначено.
3.9 Signal fail...........................................................Помилка! Закладку не визначено.
3.10 The speaker mute ...............................................Помилка! Закладку не визначено.
3.11 The receiver mute...............................................Помилка! Закладку не визначено.
3.12 Screen mess........................................................Помилка! Закладку не визначено.
3.13 Ring fail .............................................................Помилка! Закладку не визначено.
3.14 Ringing voiume is small ...................................Помилка! Закладку не визначено.
3.15 Can’t to charging................................................Помилка! Закладку не визначено.
3.16 Camera fail..................................................................................................................25
3.17 Auto Shuntdown ................................................Помилка! Закладку не визначено.
3.18 No SIM...............................................................Помилка! Закладку не визначено.
3.19 The M/B leakage of electricity .........................Помилка! Закладку не визначено.

3
1.The assemble & tear down
1.1 Tear down
1) Battery cover
Open the battery cover from left，P. 1、2。
P.1
P.2
Battery cover

4
2) Screw
Use a screwdriver to four screws from the housing，P.3
P.3
3) B cover
Use a Disassemble pieces to open the B cover
P.4
P.5
B cover
3
2
4
1

5
4) Power key & Side key
Remove the key fromA cover：
P.6
P.7
P.8
Power Key
Side Key
Power key
Side key

6
5) M/B
Open the ZIF connector and remove the FPC
P.9
P.10
Touch panel FPC
LCM ZIF connector
Side key FPC
Power key FPC
Open the ZIF connector
Camera

7
6) Vibrator
Use tweezers to remove the vibrator
P.11
7) Receiver
Use tweezers to pick the Receiver from the A cover
P.12
Vibrator
Receiver

8
1.2 assemble
Assembly and tear down process is reversed.

9
2. M/B Component Location
2.1 TOP

10

11
2.2 Bottom

12

13
3.Analysis flowchart
3.1 Boot fail
Boot fail
Check the 26 M can workable
N
Y
Re-mount
Confirm the M/B current is too large
N
Y
Change the M/B
Y
Check if have 32KHz from 26M
TCXO
Y
Check BATT connector
Y
N
Check the 26 M
TCXO
Re-mount
N
Check the power key FPC
solder ok
N
Change the FPC
Connect the USB, if the computer
can get the device
N
Y
Re-download the SW
Y
Check the PMIC？CPU,PMU & EMMC voltage ok?
Re-mount or exchange
PMIC
Exchange memory U402
N

14
3.2 Touch panel fail
CTP fail
CTP test fail？
CTP damage，
exchange
Exchange CTP, test the CTP
workable？
Exchange CTP
Check CTP connector & EMI filter mount
ok？
Y
CTP fail
N
N
Y
Re- mount the
connector & EMI
Filter
Exchange CPU
Use Oscilloscope to check I2C signal
N
N
Y
Exchange CPU U101

15
3.3Charging fail
3.3.1 When use charger no charging display
3.3.2 The computer can’t find the device
Confirm the same way as “When use charger no charging display”.
Exchange charger
When use charger
no charging
display
N
Y
Exchange the battery and check
the old battery voltage under 3 V
Exchange battery
Y
N
Check the OVP IC, USB
connectors and components
are soldered around well?
Y
OK
N
Exchange charger or USB
cable workable
？
Y
Exchange PMIC
OK

16
3.4 Speak fail
Speak fail
N
Y
OK
N
Change the audio codec
chip
Check the speaker of schematic
are soldered.。
Measure the impedance on
32ohm for receiver
Check the spring for
receiver。
Y
OK
Exchange
receiver
N

17
3.5 No ring
Change the audio codec chip
N
Check the speaker of schematic and
the connectors are soldered.
N
Exchange Speaker, check ok？
Y
OK
Y
OK
No ring
Check whether the audio amplifier
Weld or damaged.. Re-welding and
change it, try it again
N
OK
Y

18
3.6 LCM fail
3.6.1 LCM no display when power on
White screen or black screen
no display, with bright
Check MB schematic of LCD, pathway EMI
device as well as welding supply on the
motherboard to check whether it is normal,
plus welding EMI filter.
OK
Check whether there are other devices
LCD surrounding Weld, check LCD
connector is soldered
Check the LCD FPC connection
is OK, whether the phone
properly reassembled FPC
N
N
Y
OK
Y
After change LCD，Check
Display is normal
N
OK
Y
Y
Plus
welding
Weld
N
Change CPU

19
3.6.2 LCD backlight does not shine
In the case of checking whether
there should be lit LCD 20V
voltage exceeds the amount of
backlight driver output voltage
OK
Backlight
circuit
normal, LCD
problem
Check the peripheral device drivers and
backlight welding
Y
N
Y
Y
OK
Check the LCD module of FPC
is connected to the connector on
the MB is good, what is normal
reconnect
N
LCD backlight does
not shine
After change the LCD backlight,
check LCD backlight again.
OK
Y
N
N

20
3.7 The mobile is frozen
Check the power of memory and CPU is
normal.
Y
N
Y
Y
Welding device
and associated
circuits PMIC
Connected to a computer via a USB
cable, check whether the computer
device manager device pop
N
The mobile is frozen
Y
N
Update software
Check for 32 KHz signal? That from
26 MHz crystal oscillator divider
Welding try 26MHz
crystal oscillator
After welding, try
again
Check the 26MHz crystal is normal?
N
Check the schematic of memory,
after change memory, check it
again
Ok
Y
N
Change CPU