Blu C5 User manual

No.20160406
C5 Service Manual

Chart 1.Product introduction
This manual provides the technical information to support the service activity of this products
This document contains highly confidential information, so any or all of this document should not be revealed to
any third party.
1.1 Product view

Charter 3 Explode view and Part list
3.1Explode view

Charter 4 Repair tool
Picture
Name
Hot Air
Gun
Soldering
Iron
Tin
Solder Wire
ESD Gloves
ESD Wrist
Strap
Picture
Name
Plastic
stick
Plastic
Opening
Card
Cotton Swabs
Alcohol
Sim Card
Needle
Picture
Name
Multimeter
DC Power
supply
Soldering
station
Tweezers
Screw
Drivers

Chart 5 Disassembling procedure and Assembling procedure
NO.
Operation
name
Picture
Operation
and note
1
Remove
Battery
Cover &
Battery
2
Remove 13 Screws
on the Middle Cover
5.1 Disassembling procedure

NO.
Operation
name
Picture
Operation
and note
3
Remove
Middle
Cover
Remove RF Cable
& Side
-Key
Remove
Front
Camera & LCD
FPC
5.1 Disassembling procedure

NO.
Operation
name
Picture
Operation
and note
4
Remove TP
& VIB
Remove
PCB, and
Remove Rear
Camera
5.1 Disassembling procedure

NO.
Operation
name
Picture
10
All Components
5.1 Disassembling procedure

NO.
Operation
name
Picture
Operation
and note
1
Assemble Rear
Camera ,PCBA
and
Vibrator
2
Assemble TP,
Front
Camera,Side-
key,RF
Cable, LCD
FPC.
5.2 Assembling procedure

NO.
Operation
name
Picture
Operation
and note
3
Assemble Middle
Cover
4
Assemble
Battery &
Battery Cover
5.2 Assembling procedure

Charter 6 Main boards layout
TOP

Charter 6 Main boards layout
BOTTOM

Chart 7 Mobile fault analysis for L2
Start
Upgrade to
latest software
Or Restore
factory setting
OK OVER
Check if
Assembly has a
problem
FAIL
YES Reassemble
Seek help
No
Start
YES OVER
No
Upgrade to latest
Software, check if
the issue have
been solved
Yes
Check if
power key
is ok
No Replace side key
Replace Main PWB
Doesn’t switch on

Start
Upgrade to latest
software, check if
the issue have
been solved
YES OVER
No Check if the main
antenna and
Antenna shrapnel is
damaged
No
YES Replace a new one
Check if coaxial line
is ok
NO If line connector
opened, reconnect
it. If line damaged
or circuit opening,
replace a new one.
Replace Main PWB
Yes
No signal
No Display or Display issue
Start Check if it is
power issue
YES Go to power
issue
No Check the follow option:
1. Check software version is latest
2. Check if LCD is defective
No
YES Update software
or change A
cover assy
Replace LCD or PWB
Check if the LCD is
soldered correctly
No Resolder LCD
Yes

No camera
problem
Start
Update software or
reset to factory,
check if the issue is
solved
Main camera
doesn’t work or
front camera
doesn’t work
Main camera doesn’t work
Update software or
reset to factory,
check if the issue is
solved
YES Over
No Check if the camera
is damaged No Check if
Camera is properly
soldered
YES Replace a
new one
YES Change PWB
Resolder Camera
No
No
No Check if the camera
is damaged
No Check if
Connector is
damaged
YES Replace a
new one YES Change J2
Replace Main PCBA
YES
Over
Front camera doesn’t work

Keypad issue
Start Check if the Keypad
is damaged
YES Replace Keypad
No Update latest software
version, check if the issue is
solved
No Replace the Dome
sheet or replace the
keypad
YES OVER YES Over
Replace Main PWB
No
Not recognize SIM/TF card
Start Update latest software version,
check if the issue is solved No
YES OVER
Check if SIM
connector is
damaged
YES Change
Sim1301/
SIm1302
Replace Main PWB
No

Start Update latest software
version, check if the issue is
solved
No Check if antenna and its
contact is damaged
YES OVER
Replace Main PWB
YES Change Antenna shrapnel
No
GPS/BT/Wi_Fi issue
No ringtone
Start Update latest software
version, check if the issue is
solved
No Check if Speaker Cover
is damaged
YES OVER
Replace Main PWB
YES Change speaker
Cover
No

Outgoing audio issue
Start Update latest software
version, check if the issue is
solved
YES OVER
Replace Main PWB
No No
Check if SPK is
damaged
YES Replace
Incoming audio issue
Start Update latest software
version, check if the issue is
solved
No Check if Mic is damaged
YES OVER
Replace Main PWB
YES Replace
No

Doesn’t switch on
Start
YES OVER
No No Check
the power
sequence
Upgrade to latest
Software, check if
the issue have
been solved
Test if power-on
current is
abnormal
YES If the current is
higher than
normal, check
the hotter
components,
then replace it
Yes
Check if
power key
is ok
No
Replace
power key
Is the PS voltage
OK
NO
Replace PMIC
Yes Is crystal
oscillator‘s
Signal (32.768KHz)
OK
NO
Replace
32.768K
Is the
26M signal OK
NO
Replace 26M
Check if CPU
soldering is ok
NO Re-solder or
Replace CPU
Check if
Memory IC
soldering is ok
Yes
Yes
No Re-solder or
Replace
Memory IC
Replace Main PWB
Yes
Yes

No Display &Display failure
Start Check if it is
power issue
YES Go to power
issue
No Check the follow option:
1.Check software version is latest
2.Check if LCD is defective
No Check if
LCD is properly
soldered
YES OVER YES Chang LCD
/PWB
Resolder LCD
No