Lenovo P70-A Manuale di servizio - Pagina 18
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Repair Manual of Lenovo P70-A Mobile Phone
4.6
Calling
4.6.1 No voice heard from the other side during the call
Use earphone and hands-free to verify
whether there is voice?
Replace the headphones and then re
check whether it is normal
Check
B1403,B1404,C1428,C1427,D1403,D140
4,are well welded. Re-weld and test
No voice heard from the other
side during the call
Y
N
N
Replace U503
N
Y
whether
Y
17
Cold solder joint
of main
chip(U503) or
main chip(U503)
is abnormal
OK
OK