Company confidential LV81-LV82 Trouble Shooting

Сентябрь 14, 2022

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Company confidential LV81-LV82 Trouble Shooting

Содержание

2. Function Block
3. USB Conn. M/B Top Placement #1 MT6582 MCP MT6323 Audio Jack Receiver Front Camera Backup Batt.
4. M/B Top Placement #2 MIC LCM Conn. Speaker
5. M/B Bottom Placement #1 Batt. Conn. SD Socket SIM Socket #1 SIM Socket #2 Sidekey FPC
6. M/B Bottom Placement #2 Vibrator
7. BB Common Question BB-1 Can not power on BB-2 Can not download BB-3 Can not charging
8. BB-1 Can not power on (無法開機) (1/4) 1. Check VBATT (TP09 > 3.6V) 2. Check J802
9. 5. Check power level MT6323 good or bad? VPROC_PMU at R109 (0.9V~1.1V) VSYS_PMU at L303 (1.8V)
10. BB-1 Can not power on (無法開機) (3/4) Debug Flowchart
11. BB-1 Can not power on (無法開機) (4/4) 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
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
13. BB-2 Can not download (無法更新軟件) (2/3) 3. Check RF transceiver 26MHz and RF chip good or
14. BB-2 Can not download (無法更新軟件) (3/3) 4. Check com port good or bad 1: It should
15. BB-3 Can not charging (無法充電) (1/2) 1. Check R332 Pin1 (BAT_ID) around 10kΩ. 2. check voltage
16. BB-3 Can not charging (無法充電) (2/2) 4. check CHR_LDO good or bad when plug USB Check
17. BB-4 SIM Card Identification error (SIM卡無法識別) (1/2) 1. SIM detect good or bad? 2. check J3200,
18. BB-4 SIM Card Identification error (SIM卡無法識別) (2/2)
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.
20. BB-5 Can not display (畫面無法顯示或顯示異常) (2/2) Debug Flow
21. G-sensor voltage = VIO18 BB-6 sensor function fail (感測器不良) All sensor control by I2C, if one
22. BB-7 Touch Panel no function (無法觸屏) (1/2) 1. check TP Connector ? 2. replace TP， 3.
23. BB-7 Touch Panel no function (無法觸屏) (2/2) TP circuit TP voltage = 2.8V/1.8V
24. BB-8 Vibrator no function (馬達無振動) 1. check vibrator = 30Ω 2.check vibrator good or bag? 3.
25. BB-9 Camera can not turn on (無法攝像) (1/3) 1. check the camera connector? 2. replace Camera
26. BB-9 Camera can not turn on (無法攝像) (2/3) Camera I2C
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
28. BB-10 MIC no function (麥克風無作用) 1. check J1003 Microphone around 0.95KΩ 2. check Mic around voltage
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
30. BB-12 Audio function fail (Audio 不良) (1/4) Audio 1:wave play back fail? check SPK 2:receiver fail
31. BB-12 Audio function fail (Audio 不良) (1/4) Check Speaker:
32. BB-12 Audio function fail (Audio 不良) (2/4) Check receiver路径: Check MIC CPU MIC1 MIC
33. BB-12 Audio function fail (Audio 不良) (3/4) Check Headset: audio jack MIC
34. BB-12 Audio function fail (Audio 不良) (4/4) Check MIC: MIC?PMU PMU
35. BB-13 SD Card no function (SD Card無作用) SD card signal SD card clock SD card 供電端
36. BB-13 SD Card no function (SD Card無作用) SD card
37. WIFI/BT/GPS I/Q Signal SCLK,DataSignal Connect to CPU MT6582 Singal 26M TCXO，Output Clock to MT6627 WIFI/BT/GPS 功能使用的IC為MTK
38. MT6627 Power supply WIFI/BT/GPS From PMU MT6323 Output to MT6627
39. GSM PA + Switch GSM Vbat 供電 GSM LB Tx input路徑 GSM HB Tx input路徑 WCDMA
40. GSM RX GSM HB/LB電路: 2G LB Rx 2G HB Rx Balance output to transceiver LB Port
41. WCDMA Band1/8 TRx (LV82) Tx : from Transceiver Band 8 Tx Rx : balance to transceiver
42. WCDMA Band2/5 TRx (LV81) Tx : from Transceiver Band 5 Tx Rx : balance to transceiver
43. RF introduction: MT6166 Function Block
44. RF introduction: MT6166 Pin assignment
45. RF introduction: Antenna Circuit Antenna Circuit RF included 2G/3G/WIFI/GPS, Main ANT RF Paths WIFI ANT RF
46. RF introduction:2G/3G Main Antenna Position 2G/3G Matching
47. RF introduction: WIFI Antenna Position
48. RF常見問題 RF-1:internet fail RF-2:GSM problem RF-3:WCDMA problem RF-4:GSM/WCDMA Rxproblem RF-5:WIFI problem
49. RF-1:internet fail Check signal ,SIM card good or bad? Coaxial cable?
50. RF-2:GSM Trouble shooting (1/3) Check GSM Tx I/Q Signal
51. RF-2:GSM Trouble shooting (2/3) GSM Check voltage of 2G PA and ASM into U1302? Check below
52. RF-2:GSM Trouble shooting (3/3) GSM Check shooting voltage Use spectrum probe to check High band GSM
53. RF-3:WCDMA Trouble shooting (1/5) WCDMA Check IQ check wave
54. RF-3:WCDMA Trouble shooting (2/5) WCDMA Check wave
55. RF-3:WCDMA Trouble shooting (3/5) WCDMA Transceiver-3G PA, PA-Duplexer From MT6166 WCDMA BAND 1/2 signal From MT6166
56. RF-3:WCDMA Trouble shooting (4/5) WCDMA Check ASM voltage Check wave
57. RF-3:WCDMA Trouble shooting (5/5) GSM PA+ASM ASM-RF Con (GSM + WCDMA)
58. RF-4:GSM/WCDMA Trouble shooting receive Check Antenna switch Module control voltage Check wave
59. RF-5:WIFI/BT Trouble shooting(1/3) Check U1501 output 26MHz WIFI/BT Tx/Rx 26MHz
60. RF-5:WIFI/BT Trouble shooting(2/3) WIFI Tx/Rx U15004 U15000 26MHz
62. Скачать презентацию

Слайд 2

Function Block

Слайд 3

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

Слайд 4

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

Слайд 5

M/B Bottom Placement #1
Batt. Conn.
SD Socket
SIM Socket #1
SIM Socket #2
Sidekey FPC
Main

Camera

MT6627

G-Sensor

TP Conn.

Слайд 6

M/B Bottom Placement #2
Vibrator

Слайд 7

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

Слайд 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

J802

TP11 > 2.8V

Слайд 9

5. Check power level MT6323 good or bad?
VPROC_PMU at R109 (0.9V~1.1V)
VSYS_PMU

at L303 (1.8V)

BB-1 Can not power on (無法開機) (2/4)

VSYS_PMU

VPROC_PMU

Слайд 10

BB-1 Can not power on (無法開機) (3/4)
Debug Flowchart

Слайд 11

BB-1 Can not power on (無法開機) (4/4)
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
MT6323 Power On/Off sequence

Слайд 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

Слайд 13

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.

Слайд 14

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

Слайд 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?

Слайд 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

Слайд 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

Слайд 18

BB-4 SIM Card Identification error (SIM卡無法識別) (2/2)

Слайд 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

Backlight正負極

LCM兩組工作電壓

Слайд 20

BB-5 Can not display (畫面無法顯示或顯示異常) (2/2)
Debug Flow

Слайд 21

G-sensor voltage = VIO18
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 no function

Слайд 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?

Слайд 23

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

Слайд 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

Слайд 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)?

Слайд 26

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

Слайд 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

Слайд 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

Слайд 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

Слайд 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

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