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Company confidential LV81-LV82 Trouble Shooting

1.

Company confidential
LV81-LV82 Trouble Shooting
Publisher NJD HW Team
Date 2014.2.14

3.

M/B Top Placement #1
USB Conn.
Receiver
Audio
Jack
Front
Camera
MCP
MT6323
MT6166
SKY77593
MT6582
Backup Batt.
Company confidential
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4.

M/B Top Placement #2
LCM Conn.
Speaker
MIC
Company confidential
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5.

M/B Bottom Placement #1
Sidekey FPC
TP
Conn.
Main Camera
MT6627
G-Sensor
SD Socket
SIM Socket #1
SIM Socket #2
Batt. Conn.
Company confidential
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6.

M/B Bottom Placement #2
Vibrator
Company confidential
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BB Common Question
BB-1 Can not power on
BB-2 Can not download
BB-3 Can not charging
BB-4 SIM Card Identification error
BB-5 Can not display
BB-6 sensor function fail
BB-7 Touch Panel no function
BB-8 Vibrator no function
BB-9 Camera can not turn on
BB-10 MIC no function
BB-11 Speaker no function
BB-12 Audio function fail
BB-13 SD Card no function
Company confidential
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8.

BB-1 Can not power on (無法開機) (1/4)
1. Check VBATT (TP09 > 3.6V)
2. Check J802 short to GND?
3. Check below?
– PWRKEY(TP11 > 2.8V)
– TP11short to GND
TP09 > 3.6V
TP11 > 2.8V
J802
Company confidential
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9.

BB-1 Can not power on (無法開機) (2/4)
5. Check power level MT6323 good or bad?
– VPROC_PMU at R109 (0.9V~1.1V)
– VSYS_PMU at L303 (1.8V)
VPROC_PMU
VSYS_PMU
Company confidential
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10.

BB-1 Can not power on (無法開機) (3/4)
can't power on
Debug Flowchart
check battery
check battery connector
check power on voltage
Company confidential
replace battery
replace battery commector
under 2.5A
re-flash
current fail
replace compoment
no current
replace J17001
check J07001
replace J07001
check U05002
replace U05002
check voltage control
replace U06001
check U05001 voltage
replace U05001
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BB-1 Can not power on (無法開機) (4/4)
MT6323 Power On/Off sequence
VCORE≈0.7V~1.3V
VPORC≈0.7V~1.3V
VIO18=1.8V
VIO28=2.8V
VM12_INT=1.2V
VA1=2.5V
VA2=2.5V
VUSB=3.3V
VTCXO=2.8V
VMC=3.3V
VMCH=3.3V
RESET=1.8V
Company confidential
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12.

BB-2 Can not download (無法更新軟件) (1/3)
1. Check power voltage。 around 0.109A)
2. Check F07001
提供CPU内部USB驱
动电路供电电源,电
压为3.3V左右
Company confidential
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BB-2 Can not download (無法更新軟件) (2/3)
3. Check RF transceiver 26MHz and RF chip good or bad when can’t get into
META mode.
Sysclk由Y1301通过RF transceive
output reference clock for MTK6582 .
此异常会造成开机后电流维持在60mA.
Company confidential
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BB-2 Can not download (無法更新軟件) (3/3)
4. Check com port good or bad
1: It should be
show MTK USB
Port when plug DL
2:It should be show META
mode after DL and open
BB/RF META tool
Company confidential
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15.

BB-3 Can not charging (無法充電) (1/2)
1. Check R332 Pin1 (BAT_ID) around 10kΩ.
2. check voltage >4.5V
3. Check J801 USB connector good or bad?
Company confidential
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16.

BB-3 Can not charging (無法充電) (2/2)
4. check CHR_LDO good or bad when plug USB
Check charger
Check Ω
Charging
current sense
Battery voltage
sense
Company confidential
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17.

BB-4 SIM Card Identification error (SIM卡無法識別) (1/2)
1. SIM detect good or bad?
2. check J3200, J3201soldering good or bad?
3. check SRST, VSIM,SIO and SCLK signal
Company confidential
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18.

BB-4 SIM Card Identification error (SIM卡無法識別) (2/2)
Company confidential
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19.

BB-5 Can not display (畫面無法顯示或顯示異常) (1/2)
1. check J1200 soldering good or bad?
2. replace LCM.
3. check R1202, R1203 and L1202, L1203, L1204 good or bad?
4. check LCM voltage(VIO28_PMU and VIO18_PMU)?
5. if no back light check U901, R1914, R915, D901, R903
LCM兩組工作電壓
Backlight正負
極
Company confidential
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20.

BB-5 Can not display (畫面無法顯示或顯示異常) (2/2)
Debug Flow
LCM fail
check J11001
Company confidential
replace J11001
check LCM module
replace LCM module
check U05001
replace U05001
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21.

BB-6 sensor function fail (感測器不良)
All sensor control by I2C, if one of sensor function fail, you need to check all of
them
G-sensor
G-sensor voltage =
VIO18
G-sensor no
function
Company confidential
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22.

BB-7 Touch Panel no function (無法觸屏) (1/2)
1. check TP Connector ?
2. replace TP
3. check J2001?
4. check TP vlotage (VDD28_PMU and VDD1V8_PMU)?
5. check I2C, Reset, INT good or bad?
Company confidential
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23.

BB-7 Touch Panel no function (無法觸屏) (2/2)
TP circuit
TP voltage =
2.8V/1.8V
Company confidential
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24.

BB-8 Vibrator no function (馬達無振動)
1. check vibrator = 30Ω
2.check vibrator good or bag?
3. check C3331 good or bad?
4. check the voltage of VIBR_PMU when power on
Company confidential
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25.

BB-9 Camera can not turn on (無法攝像) (1/3)
1. check the camera connector?
2. replace Camera module.
3. check J902?
4. check EMI901, EMI902, EMI903?
5. check Camera voltage (VCAMD_IO_PMU, VCAMA_PMU)?
Company confidential
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26.

BB-9 Camera can not turn on (無法攝像) (2/3)
Camera
I2C
Company confidential
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27.

BB-9 Camera can not turn on (無法攝像) (3/3)
1:camera function fail, check /reset/CLK/PWD
good or bad
2:balck screen: check camera DATA。
VREF/HREF: Sensor垂直/水平參考
信號
MCLK:來自CPU的主時鐘輸出
PCLK:象數時鐘輸入
Company confidential
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28.

BB-10 MIC no function (麥克風無作用)
1. check J1003 Microphone around 0.95KΩ
2. check Mic around voltage
MIC周邊電路
MIC
Company confidential
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29.

BB-11 Speaker no function (喇叭無聲)
1. check Speaker around 8Ω
2. check Speaker voltage
SPK周邊電路
SPK
Company confidential
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30.

BB-12 Audio function fail (Audio 不良) (1/4)
Audio
1:wave play back fail check SPK
2:receiver fail check receiver.
3:headset fail check headset.
4:phone mic to headset fail check MIC .
5:headsetmic to headset fail check headset to Mic.
As below
Company confidential
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31.

BB-12 Audio function fail (Audio 不良) (1/4)
Check Speaker:
Company confidential
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BB-12 Audio function fail (Audio 不良) (2/4)
Check receiver路径:
CPU
Check MIC
MIC1
MIC
Company confidential
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33.

BB-12 Audio function fail (Audio 不良) (3/4)
Check Headset:
audio jack
MIC
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34.

BB-12 Audio function fail (Audio 不良) (4/4)
Check MIC:
PMU
MIC PMU
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35.

BB-13 SD Card no function (SD Card無作用)
1.check SD connector。
2.check voltage around good or bad?
SD card
供電端
SD card data
transfer
SD card
control signal
SD card clock
SD card
signal
If SD card fail,check check
U1604 and U1605
CMD/CLK/DET/DATA
Company confidential
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