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File number：
MZ-CSGY-03-0416
M1971 Primary maintenance manual
(VERSION：V1.0)
Edit by ：Rui Yan
Review by：ZhiFeng Zhong
Approve by：ChuanSan Wang
Publish date：April, 24th, 2019 Implement date: April, 24th, 2019
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Contents
M1971 Primary maintenance manual
.........................................................................
1
Chapter 1 Caution of Maintenance
........................................................................
3
Chapter2 M1971 introduction
...................................................................................
4
1. The appearance of M1971
........................................................................
4
2. The main components of cellphone
......................................................
5
3. Technical specifications
......................................................................
6
Chapter3 Explode view
..............................................................................................
9
Chapter4 Common fault detection and maintenance
........................................
10
1. No boot issue
..........................................................................................
11
2. Recognized SIM Card Malfunction
......................................................
14
3. Volume button Malfunction
..................................................................
15
4. Screen Touch Malfunction
....................................................................
16
5. OLED display Malfunction
.....................................................................
17
6. Speaker Malfunction
..............................................................................
18
7. Receiver Malfunction
............................................................................
19
8. Headset Malfunction
..............................................................................
20
9. Main MIC and Sub MIC Malfunction
....................................................
21
10. Rear camera and front camera Malfunction
....................................
22
11. Breath light Malfunction
....................................................................
23
12. Signal Malfunction
................................................................................
24
13. Finger print& Pressure induction Malfunction
.............................
25
15. WIFI / Bluetooth / GPS Malfunction
...............................................
26
16. Infrared sensor Malfunction
..............................................................
27
17. Motor Malfunction
..................................................................................
28
18. Charger Malfunction
..............................................................................
29
19. Note：
........................................................................................................
30
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Chapter 1 Caution of Maintenance
1. Only authorized technicians can do maintenance and
calibration.
2. Make sure that engineers wear antistatic wrist strap repair
phones in antistatic station.
3. Make sure that maintenance room is covered with antistatic mat,
and the maintenance table is covered with antistatic material.
4. Make sure that all necessary screws and parts are installed
in correct location of phone after maintenance and adjustment.
5. After maintenance, clean the PCBA.
6. As static electricity is the main reason for electronics
damages, engineers shall repair phones in an anti-static
environment and shall take effective antistatic protection
measures.
7. For an occurrence of NG test, engineers should check if the
test point is dirty or test point contact is poor.
8. Check if water penetrates to mainboard. If yes, check all the
components to see if there is oxidation.
9. Make sure that maintenance room is bright and has natural
ventilation. Ventilation: When do maintenance or soldering, some
equipment can emit hazardous gas. So the maintenance room should
have good natural ventilation. If there are no windows in
maintenance room, the room should be equipped with electric air
regenerating equipment.
10. There should be obvious antistatic labels in Electrostatic
Sensitive area, such as in maintenance area and spare part
warehouse.
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Chapter2 The introduction of M1971
1. The appearance of M1971
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2.The main components of cellphone：
3.Technical specifications
Product
overview
Product model
16s
Item name
M1971
Operating
system
Flyme7.9（base on Android P）
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version and
standard
Band
model
SN
prefix
Oversea
version
GSM：B2/B3/B5/B8
WCDMA：B1/B2/B4/B5/B8
CDMA：BC0
TD-LTE：B40
FDD-LTE：B1/B2/B3/B4/B5/B7/B8/B20
M971H
971H
whole unit
Size
151.9*73.4*7.65mm
whole unit
Weight
165g
Color
Black、white、Gradient blue
ID technology
Bright metal middle frame + 3D Glass back cover
SIM card
Deal nano card
Brand
QUALCOMM
model
Qualcomm Snapdragon 8150
process
7nm
Frequency
The highest can reach 2.8GHz
GPU
Adreno 640
Framework
4x2.8GHz Gold + 4x1.7GHz Silver
RAM
6GB/8GB DDR4X
ROM
128GB UFS 2.1
Storage
combination
6+128GB，8+128GB
Storage card
Not support
Package
method
POP
TP
TP type
2.5D glass
TP function
Black Gesture unlock／Wet hand
operation／Glove handling/10 点
touch/Edge preventing mistakenly touch
TP technology
On-cell，Anti-fingerprint coating
LCM
LCM size
6.15" FHD+ 18:9 Hard screen，R angle
Cutting
Display technique
AMOLED
Resolution
2232*1080
Chromatic number
16.7M
Brightness
430nit
Visual angle
ALL viewing angle display
PPI
403ppi
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Contrast
100000:1
Raise to wake
Support
Always OnDisplay
Support
Rear camera
Pixel
48M+20M
Sensor
IMX 586+OIS+IMX 350
Camera Lens
SUNNY 39176B
Aperture
F1.7+F2.6
Optical anti shake
Support
Autofocus
AF
Focusing mode
Phase focus、Laser focus
ISP
Inside
Flash light
6LED flash light ring
Camera lens
Glass lenses
Front camera
Pixel
20M
Sensor
Samsung 3T2（20M，0.8um）
Lens
SUNNY 3972A
Aperture
F2.2
Optical anti shake
Not support
Face recognition
Support
Auto focusing
FF
Focusing method
N/A
ISP
Inside
Flash light
Not support
Battery
capacity
3600mAh（type）,3540mAh（min）
mCharge
1.2C/0.7C Step charging
Battery energy
density
668
PMU
PM855B+SMB1390
Fuel gage
Qualcomm built-in solution
Charger
Qualcomm built-in solution
specification
UP0830S
protocol
PE+
HIFI
Not support
Smart PA
Support
CS35L41
Noise
reduction
algorithm
Support
Spec timbre
Audio chip
Support
speaker
1217 Superlinear
Receiver
0815
MIC
Dual MIC
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Fingerprint
recognition
Live detection
Not support
Payment authentication
Wechat pay&Alipay
Heart rate detection
Not support
Acceleration
of gravity
Support
Gyroscope
Support
Distance sensor
Support
Light sensor
Support
Electronic
compass
Support
Holzer
No Support
Applicable
frequency
700-2700MHZ
WLAN
Support 2.4G/5G WIFI；802.11a/b/g/n/ac；Support 2*2MIMO
Bluetooth
Support BT5.0
GPS
GPS/Glonass/beidou
Call and
standby
Dual sim card dual standby single pass
VoLTE
Support
RF
SDR855
NFC
Support
Motor
0619 Horizontal Linear Motor
Pedometer
Support
Breathing
light
Support
FM
Not support
Main antenna
and Vice
antenna
switching
Support
Waterproof /
dust-proof
Not support
OTG
support
USB data port
Type C 2.0
Headset port
Not support
Audio format
flac、ape、aAc、mka、ogg、mp3、midi、m4a、amr、wav (ra、wma)
Audio
encoding
format
FLAC、APE、DTS、AC3、OGG、AAC、ADPCM、ALAC、MP3、AMR
－WB、AMR－NB (COOK、ATRC)
Video format
mp4、3gp、mov、mkv、avi、flv、mpeg、m2ts、ts (wmv、asf、rm、rmvb)
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Video
encoding
format
H264、MPEG4、VC1、H263、MPEG1、MPEG2、VP8 (XVID、DIVX5、DIVX4、DIVX3
、
VP6、WMV1、WMV2、WMV3、RV10、RV20、RV30、RV40)
Picture
format
JPEG、PNG、GIF、BMP
Chapter3 Explode view
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Chapter4Common fault detection and maintenance
For poor functional machines, the problem of software should be
eliminated first. And then investigation of hardware failures. Software
upgrade should be follow below step:
Firmware update
If the phone is flashed to Flyme firmware once again and the
current problem still can’t be solved, Please flash the phone
to Engineer firmware (Refer to M1971 Upgrade Guide). Then use
the test software carried by phone to do further tests to
troubleshoot.
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1.
No boot issue
a. Press the power button +volume down button at the same time, cellphone will auto access
fastboot mode. As below picture
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b.Press the power button + volume plus button at the same tme. Cellphone will access
Recovery mode
c. Press volume plus ,volume down and power button at the same time.the cellphone will
access the USB download mode.note:the cellphone will not show anything at this monent.
You need to press the power buttton about 10s.and then the cellphone will boot up.
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2.
Recognized SIM Card Malfunction
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3.Volume button Malfunction
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4. Screen Touch Malfunction
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5.OLED display Malfunction
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6. Speaker Malfunction
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7.Receiver Malfunction
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8. Headset Malfunction
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9. Main MIC and Sub MIC Malfunction
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10. Rear camera and front camera Malfunction
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11. Breath light Malfunction
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12.
Signal Malfunction
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13. Finger print& Pressure induction Malfunction
Fingerprint and pressure sensor are integrated into the LCD touch screen assembly.
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14. WIFI / Bluetooth / GPS Malfunction
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15. Infrared sensor Malfunction
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16. Motor Malfunction
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17. Charge Malfunction
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18.Note
：
If you meet one of below issue and you can try to flash Flyme firmware again. If it’s
doesn’t work. You can replace mainboard directly.：
Fault item
Maintenance step 1
Maintenance step 2
Gyroscope
Re-flash Flyme
Replace mainboard
Gravitational induction
Re-flash Flyme
Replace mainboard
Compass
Re-flash Flyme
Replace mainboard
Hall sensor
Re-flash Flyme
Replace mainboard
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