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Check TP406,TP408,TP407.
Check if there is any Major difference.
Refer to left side of Figure 4-21-1
Check R421,C448.
Check if there is any Major difference.
Refer to right side of Figure 4-21-1
Figure 4-21-1. GSM RF Control signal
No
Similar?
Yes
No
Similar?
Yes
Control signal is OK.
See next page to check
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4. TROUBLE SHOOTING
No
Short?
Redownload SW
Yes
Change the board
No
Resoldering VDD_A block
Short?
(L416, L411, L414, R409)
Yes
Resoldering LPF block
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