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Customer Service
I902/861809 Service Manual
I902 Service Manual
Prepared: Andy Zheng
Verified: Eric Chen
Approved: Eric Chen
Date: 2015/07/29
CAUTIONS
1、 Please read this service manual carefully and make sure all elements of anti-static are in
place before the repair work is carried out.
2、 Servicing and alignment MUST be undertaken by qualified personnel only.
3、 Please use specified tools and equipments for servicing, in which the parameters need to be
calibrated with specified criteria.
Content
1.Brief Introduction…………………………………………………………………………………………………………………….2
2.Exploded View………………………………………………………………………………………………………………………..2
3.Tools………………………………………………………………………………………………………………………………………..3
4.Assemable&Dissemble
Dissembly……………………………………………………………………………………………………………………………..4
Assembly………………………………………………………………………………………………………………………………5
5.Picture of main board
A&B side of PCBA………………………………………………………………………………………………………………….7
A&B of PCBA layout………………………………………………………………………………………………………………8
6.System Block Chart………………………………………………………………………………………………………………..8
7. Trouble Shooting Guide …..……………………………………………………………………………………………………8
8. Upgrading & IMEI writing………………………………………………………………………………………………………15
Customer Service
I902/861809 Service Manual
CHAPTER 1 INTRODUCTION
I902/861809 Main function
*Andriod 4.4.2
*9inch 800*480 LCD
*Camera: front camera 0.3Mpx
*WiFi, Bluetooth
*Multimedia player
*T-Flash Up to 32 GB
*MP3, AAC,AAC+, e AAC+, AMR, WB-AMR, MIDI,
*Allwinner A33 ,8GB+512MB
*Gravity Sensor
*USB 2.0
Spec：
WiFi:802.11b/g/n
Bluetooth：Support BT 2.0
LCD Display Resolution: 9inch 800*480 LCD
Camera: front camera 0.3Mpx
Size：237*139.8*10.3 mm
Battery:3800mAh
USB 2.0
Chapter 2 Exploded View
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I902/861809 Service Manual
CHAPTER 3、SERVICE TOOLS
Iron
Hot air gun
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Voltage regulator
I902/861809 Service Manual
Multimeter
Solder wire, soldering paste
CHAPTER 4、DISASSEMBLY AND ASSEMBLY
4.1 DISASSEMBLY
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I902/861809 Service Manual
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4.2 ASSEMBLY
I902/861809 Service Manual
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I902/861809 Service Manual
CHAPTER5 . Picture of main board
Side A layout
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Side B layout
I902/861809 Service Manual
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I902/861809 Service Manual
Chapter 6 System block diagram
All diagram sent in PDF. Please see PDFs
Chapter 7TROUBLE SHOOTING
Cannot power on
Make the tablet connect the power supply
Upgrade the software
Check and reweld the
I/O connector
NO
NO
Replace
PCBA
YES
YES
END
Repair flow for tablet dead
Tablet dead
Upgrade the software can settle
the defect issue
YES
Upgrade the
software
NO
Check battery connector and battery
touch point if dropped or dirty
NO
Clean or replace the battery
YES
YES
Check the LCD if work or not
Check and reinstall the LCD
Check the touch panel if work or not
YES
Check and replace touch panel
Check the flash if is rosin joint or
damage
YES
Reweld or replace PCBA
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I902/861809 Service Manual
Check the CPU if is rosin joint or
damage
YES
Reweld or replace PCBA
END
No display or display abnormality
No display or display abnormality
after power on
Check LCD if damage or liquid
flow out
YES
Change LCD
NO
Check LCD connector is OK or
not
NO
Clean/re-solder
connector
YES
Change LCD FPC
YES
Problem solve
NO
Check PCBA
YES
END
Upgrade software
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I902/861809 Service Manual
TP can’t work
TP can’t work
YES
Problem solve
Upgrade software
YES
Re-solder
reassemable
Check the connect status
between TP and PCBA
YES
Change TP
NO
Check voltage of PCBA FPC
connector is OK or not
NO
Check PCBA working status is
OK or not
NO
Replace PCBA
END
Problem solve
or
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I902/861809 Service Manual
NO/weak signal trouble shooting
No or weak signal
Inspect the antenna and
antenna connector to see if
there’s any distortion
YES
Replace the defective component
NO
Replace the PCBA
Burn in firmware
No/Low sound from Speaker
No sound or noise
NO
Press volume button to check if there’s the
ring is normal
YES
Check if the volume is in lowest mode
YES
END
NO
Remove and replace the
speaker
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I902/861809 Service Manual
No/Low sound from MIC
No/Low sound from MIC
Make device reboot then check if
have sound from MIC
NO
Replace MIC
END
Does not charge
Does not charge
Use another adapter to
check if can charge or not
YES
Replace adapter
NO
Change
battery
Re-flash SW
NO
Check battery connector testing pin, if the
bias resis and vatge be normal
YES
YES
Check PCBA battery pin if bias resis and
vatge be normal
NO
Check PCBA and re-flash SW
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I902/861809 Service Manual
END
Stand-by short time
Stand-by short time
Re-flash SW
Change battery
NO
Power on the tablet, check the if working current be normal(around700-850mah)
NO
Replace PCBA and re-flash firmware
END
Can’t read T-Flash card
Can’t read T-Flash card
YES
Check T-flash card appearance and use
new T-flash if OK
Check if T-Flash slot appearance is OK
NO
Re-solder T-flash slot
NO
Replace PCBA and re-flash firmware
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I902/861809 Service Manual
WIFI、BT defect repair flow chart
WIFI、BT cann’t open, cann’t work normal
YES
Software update and check the function is ok or not
YES
NO
Replace PCBA and re-flash firmware
YES
END
Chapter 8 Firmware Upgrading Guide
Please see I902 PhoenixSuit manual.
.
Software update