LG LG-D855 - Page 65

3. TROUBLE SHOOTING
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Check TP1/2
If GSM850/900 Over 31dBm?
If DCS/PCS Over 28dBm?
No
OK?
START
Check next step
Yes
Check TP3/4
If GSM850/900 Over 9dBm?
If DCS/PCS Over 7dBm?
Check Transceiver physical damage
or soldering condition
Yes
Not good
No
Check component above RF signal path
Check U1301 soldering
Replace U1500