In this post we have explained in detail to check and repair the faults
seqencially using step by step techniques .we have taken care of every
aspect of fault finding such as cold testing ,hot testing software
conditions etc.and included all these in post with complete knowledge of
repairing such faults, the techniques give in this post also guide you
to repair other phones also
1-check the battery &battery connector
2-check the power on/off key
3-check the 3.6v on key connector(charging OK no power )
4-check the shorting on battery connector (+,-)
short mobile
5-clean the PCB by cleaner
6-remove the PFO supply coil
7-when shorting is not found then PFO fault, change it.
8-when shorting is found then POWER IC & THAVO IC fault, change it.
9-resold the POWER IC & THAVO IC
10-change the POWER IC & THAVO IC
11-resold the FLASH IC
12-check the power ic output voltage
13-when voltage not found ,change the power ic
14-when voltage found ,change the cpu&flash ic
15-DO FLASHING
1-check the battery &battery connector
2-check the power on/off key
3-check the 3.6v on key connector(charging OK no power )
4-check the shorting on battery connector (+,-)
short mobile
5-clean the PCB by cleaner
6-remove the PFO supply coil
7-when shorting is not found then PFO fault, change it.
8-when shorting is found then POWER IC & THAVO IC fault, change it.
9-resold the POWER IC & THAVO IC
10-change the POWER IC & THAVO IC
11-resold the FLASH IC
12-check the power ic output voltage
13-when voltage not found ,change the power ic
14-when voltage found ,change the cpu&flash ic
15-DO FLASHING
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