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Summary of Contents for Lenovo A316
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Page 1: Trouble Shooting Guide
Lenovo A316 Trouble Shooting Guide LENOVO... - Page 2 Manu The assemble & tear down ..........Помилка! Закладку не визначено. Tear down ........................3 Assemble ........................8 M/B Component Location ..........Помилка! Закладку не визначено. Top ..........................9 Bottom ......................... 11 Analysis flowchart ............Помилка! Закладку не визначено. Boot fail ........................13 Touch panel fail ..........
- Page 3 1. The assemble & tear down 1.1 Tear down Battery cover Open the battery cover from left，P. 1、2。 Battery cover...
- Page 4 Screw Use a screwdriver to four screws from the housing，P.3 B cover Use a Disassemble pieces to open the B cover B cover...
- Page 5 Power key & Side key Remove the key from A cover： Side key Power key Power Key Side Key...
- Page 6 Open the ZIF connector and remove the FPC Touch panel FPC Open the ZIF connector Camera Power key FPC Side key FPC LCM ZIF connector P.10...
- Page 7 Vibrator Use tweezers to remove the vibrator Vibrator P.11 Receiver Use tweezers to pick the Receiver from the A cover Receiver P.12...
- Page 8 1.2 assemble Assembly and tear down process is reversed.
- Page 9 2. M/B Component Location 2.1 TOP...
- Page 11 2.2 Bottom...
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Page 13: Analysis Flowchart
3. Analysis flowchart 3.1 Boot fail Boot fail Check the power key FPC Change the FPC solder ok Change the M/B Confirm the M/B current is too large Connect the USB, if the computer Re-download the SW can get the device Check if have 32KHz from 26M Check the 26 M TCXO... - Page 14 Exchange CPU U101 3.2 Touch panel fail CTP fail CTP test fail？ CTP damage， exchange CTP fail Exchange CTP, test the CTP Exchange CTP workable？ Re- mount the Check CTP connector & EMI filter mount connector & EMI ok？ Filter Oscilloscope to check I2C signal Exchange CPU...
- Page 15 3.3Charging fail 3.3.1 When use charger no charging display When use charger no charging display Exchange charger or USB Exchange charger cable workable？ Exchange the battery and check Exchange battery the old battery voltage under 3 V Check the OVP IC, USB connectors and components are soldered around well? Exchange PMIC...
- Page 16 3.4 Speak fail Speak fail Exchange Measure the impedance on receiver 32ohm for receiver Check spring receiver。 Check the speaker of schematic are soldered.。 Change the audio codec chip...
- Page 17 3.5 No ring No ring Exchange Speaker, check ok？ Check the speaker of schematic and the connectors are soldered. Check whether the audio amplifier Weld or damaged.. Re-welding and change it, try it again Change the audio codec chip...
- Page 18 3.6 LCM fail 3.6.1 LCM no display when power on White screen or black screen no display, with bright Check the LCD FPC connection is OK, whether the phone properly reassembled FPC After change LCD，Check Display is normal 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.
- Page 19 3.6.2 LCD backlight does not shine LCD backlight does not shine Check the LCD module of FPC is connected to the connector on the MB is good, what is normal reconnect After change the LCD backlight, check LCD backlight again. In the case of checking whether Backlight circuit there should be lit LCD 20V...
- Page 20 3.7 The mobile is frozen The mobile is frozen Connected to a computer via a USB Update software cable, check whether the computer device manager device pop Check for 32 KHz signal? That from Welding try 26MHz 26 MHz crystal oscillator divider crystal oscillator Check the 26MHz crystal is normal? After welding, try...
- Page 21 3.8 Power key & side key fail Power key & side key fail Check button FPC soldering & assembly, Re-solder or re-assembly Change FPC Push button & check the signal short to Change CPU...
- Page 22 3.9 signal abnormal Signal abnormal Set phone to engineering Re-write SN\IMEI mode & check if SN\IMEI be wroten Re-assembly ANT connector Check ANT connector OK Check down load tool Re-download SW to see if information to locate the Download pass issue Check modem &...
- Page 23 3.10 Receiver no sound Receiver no sound Change receiver Measure receiver resistance 32ohm Check receiver spring connection OK , re-assembly receiver Check receiver bead soldering, re-soldering & test Check audio codec power Re-soldering or change & soldering audio codec...
- Page 24 3.11 MIC not work MIC not work Check MIC soldering & Re-solder MIC re-solder ＯＫ Change MIC ok? Check sub-board connection soldering & assembly OK? Re-soldering & assembly Re-soldering audio codec...
- Page 25 3.12 Screen Mess Screen mess Check LCD FPC connection， Reassemble FPC if the phone is OK Replace the LCD，display is ok LCD fault Check the EMI Components on the LCD path of the main board and if the power supply is ok， Re-solder EMI filter Check the components around the LCD Re-solder them...
- Page 26 3.13 Ring fail Ring fail Measure speaker impedance if Speaker fault, replace it is ok (8Ohm or 4Ohm) Check the speaker leaf spring if connect to the contact point well and Reassemble it. Check the bead in the receiver circuit if have a poor soldering, and re-solder it.
- Page 27 3.14 Ring is low Ring is low Check audio NV and Re-download SW Speaker fault, replace Measure speaker impedance if ok (8Ohm or 4Ohm) Check the speaker leaf spring if contact the point well and Reassemble it. Check the bead in the receiver circuit if have a poor soldering and re-solder it.
- Page 28 3.15 Can’t charge Can’t charge Replace the charger and Charger fault USB Cable Replace the battery if is ok? Replace battery Measure the battery voltage if is less than 3V. Check the OVP IC， USB connector and the components around the connector if have a poor soldering and re-solder it Replace the PMIC...
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Page 29: Camera Fail
3.16 Camera fail 3.16.1 The rear Camera can’t take photos The rear Camera can’t take photos Teardown check whether the Camera module is separated from, reshipment module is OK Replacing Camera Module Check the connectors are soldered good , rework it Check EMI device is complete, the Rework it and try again welding is good？... - Page 30 3.16.2 The front Camera can’t take photos The front Camera can‘t take photos Open the phone ， check whether Camera module Weld or re-welding module is OK Replacing Camera Module is OK Rework it and try again Check EMI device is complete, the welding is good？...
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Page 31: Auto Shutdown
3.1.7 Auto Shutdown Auto Shutdown Check whether the battery has power, battery Charging the battery, replace the temperature detecting pin, connectors are in good condition connector Turned on the phone with the DC Source, Check whether the device has observe electric current Turned on the phone been damaged with the DC Source, observe electric current According to Download Tool tips,... - Page 32 3.18 No SIM No SIM Replace a new SIM card Check whether write Rewrite SN number and number and the IMEI number the IMEI number Teardown check the connection condition of RF antenna, can reassemble the general card Check the transceiver IC, PA and surrounding devices welding is good Replace Modem Chip...
- Page 33 3.19 The M/B leakage of electricity The M/B leakage of electricity Electric leakage can be Plus electricity but does not boot, determined on VBAT then observing whether there is a which is supplying the large leakage current battery power directly Open the phone, Plus electricity and Screening the module boot it, then Touch all parts of the...