LG U8290 Service Manual page 83

4. TROUBLE SHOOTING
Checking Switch Block power source
Check Soldering of
ANT_SEL 0, 1, 2 High Level
Check VCC
NO
2.5V < Voltgae < 3.0V
TP1 VREG_RFRX_0_2.85V
YES
Check the Logic
in each mode
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