LG GX500 - Page 105

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4. TROUBLE SHOOTING
GX500 Operational Description Revision A
LG Electronics 106/143 LGE Property
Figure 4-55. GSMK Control Signal
Figure 4-56. 8PSK Control Signal
Check Control Signals
(TP1, TP2, TP3)
TP3(PA MODE) : R441/R623
TP1(PA_LEVEL) : R403/R605
TP2(TXON_PA) : R429/R620
TP1(PA_LEVEL)
TP2(TXON_PA)
TP3(PA MODE)
TP1(PA_LEVEL)
TP2(TXON_PA)
TP3(PA MODE)
TP1(PA_LEVEL)
TP2(TXON_PA)
TP3(PA MODE)
Signals are
Normal ?
Check
PMB8877/PMB8888
(U101/U502)
Yes
No
PAM Control Signal is OK.
See next page to check
FEM & Mobile SW Circuit.
Checking Flow