Lenovo A316 Troubleshooting 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 from A 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

Y

Re- mount the

connector & EMI

Filter

Exchange CPU

Use Oscilloscope to check I2C signal

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

Y

OK

Y

After change LCD，Check

Display is normal

N

OK

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

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

20

3.7 The mobile is frozen

Check the power of memory and CPU is

normal.

Y

N

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

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Lenovo A316 Troubleshooting Manual

Lenovo A316 Troubleshooting Manual

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