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Reassemble the
phone ,
re-weld R1130
Take out LCD,CAM, Light sensor FPC,
Check whether it is OK
Cross test,find
the key point
Y
N
N
Y
N
N
Y
Y
4.1 No power on
4 Reference for maintenance
Re-weld or change
U1102
L1102,L1100,L1103
Re-weld or change
U1100
OK
C1186:1.1V, C1184:1.2V, C1103:1.8V, C1117:1.2V, C1103:2.8V,
N
Y
N
Y
Y
whether progress bar
Is no response
Y
N
Y
N
Y
N
Check whether the
battery voltage is
higher than 3.5V
Check whether U1100 is
weakly welded or broken
Change battery
N
Y
Whether U1100 is weakly
welded or broken
Re-weld or change
U1100
N
4.2 Download fail
Re-weld or change
U1100
OK
C1186:1.1V, C1184:1.2V, C1103:1.8V, C1117:1.2V, C1103:2.8V,
N
Y
N
Y
Y
Re-assemble or
re-weld or change
Y
Sub-board B120,B121,
D120,D121C120,C121,
C122 is wrong welded
N
4.3.1 No ring
Re-weld or change
U1102
Y
Re-weld
ok
Y
N
N
Y
Y
N
4.3.2 No receiving voice
ok
Re-weld
Y
N
N
N
Y
Y
Y
N
4.3.4 No sending voice
Y
N
Check the earphone Jack
is broken or weakly welded
Change earphone line,
is OK?
OK
Y
N
Y
N
N
Y
N
Y
Re-weld or change
U1100
4.3.5 Earphone detect fail
OK
N
4.3.6 Earphone inefficacy
Check whether the
firmware is OK?
ok
B1301
is weakly welded
Re-welded
N
N
N
N
Y
Y
Y
Y
4.4 No vibrating
OK
Re-weld or change U1102
Y
Re-weld B1100,R1139,
R1140
OK
Plug in chager,the voltage
of B1100 is 5V?
N
N
Y
Y
N
N
Y
Y
OK
U1103,U1104,
R1141,R1142
is weakly welded
Re-weld
Y
Re-weld or change U1102
N
4.5 No charging
Check whether the
firmware is OK?
OK
N
N
Y
Y
Y
N
Check whether is capacity is
short to ground?re-weld it or check
whether R4401 is weakly weld
N
Change or re-weld U1100
4.6 Camera inefficacy
Y
E4401-E4403 is weakly welded?
Re-weld or change
Y
N
N
Re-weld or change U1100
4.7.1 LCD display wrong
N
Check whether U4400 U1100
is weakly welded
Y
Whether U4400 is hot?
Y
Change U4401 or L4401
N
D4410,R4807,R4402
is weakly welded
Re-weld
Y
4.7.2 LCD backlight inefficacy
OK
Check whether other components near BT
Circuit is weakly welded
Re-weld
Y
N
Y
N
N
Y
N
Y
U5501,R5508
is weakly welded
Y
The voltage of R5508
is 2.8V;if no re-weld
or change U5503
4.8.1 Power on fail
The voltage of R5513 is 1.7V?
Re-assemble ant
Y
N
Y
Y
N
Y
N
N
4.8.2 Connect fail/bad voice
Re-weld or change
U5503,L5508
Check whether other components near
WIFI Circuit is weakly welded
Re-weld
N
Y
N
Y
N
Y
U5501,R5508
is weakly welded
Y
The voltage of R5508
is 2.8V;if no re-weld
or change U5503
The voltage of C5538 is 2.8V?
N
N
L5503 is weakly welded
N
Re-weld U5503
Y
Re-weld
4.10 FM inefficacy
C1160,C1161 is weakly welded
N
Re-weld U1100
Y
Re-weld
Change,re-assemble
or re-weld
N
Y
Re-weld or change U1100
4.12 KEY LED NG
Re-weld
N
N
4.13.1 Proximity sensor NG
Whether the fpc is broken of
Fixed wrongly
Change or re-assemble
Y
J9422 is weakly welded
Re-weld or change
Y
N
N
Re-weld U1100
Change it
N
N
Y
Y
Y
N
Re-weld or change U1100
N
Re-weld
Y
N
4.14 SIM card inefficacy
N
Re-weld
Y
4.15 TF card inefficacy
N
N
N
N
U5502 is weakly welded?
N
Re-weld U5502
Y
4.16 GPS inefficacy
Re-weld
Y
N
N
N
Y
N
U4404 is broken or
weakly welded
N
Change or re-weld U4404
Y
Re-weld or change
Y
N
Re-weld U1100