LG AT&T GR500 Service Manual page 147

4. TROUBLE SHOOTING
Check PIN10,PIN11,PIN12 of RF3300.
Check if there is any Major difference.
Refer to Figure 4-15
LGE Internal Use Only
STRB
STRB
CLK
CLK
DATA
DATA
Figure 4-21. GSM RF Control signal
No
Similar?
Yes
Control signal is OK.
See next page to check
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No
Short?
Re-download SW
Yes
Change the board
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