Checking Pam Block - LG U8290 Service Manual

4. TROUBLE SHOOTING

4.5.4 Checking PAM Block

PAM control signal
PA_ON : WCDMA Tx Power Detect IC(U203:HDET) Enable
PA_FET_N
PA_FET_N must be LOW if the max Tx power is set (lower than 0.5V)
PAM IN/OUT Signal
PA_FET_N : WCDMA PAM Vcc Control Signal (Q200)
TX_AGC_ADJ : WCDMA Tx Power Amp Gain Control
PA_ON must be HIGH(over 2.5V)
PAM_IN
PAM OUT must be over 16dBm
PAM IN must be over -5dBm
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PA_ON
TX_AGC_ADJ
PAM_OUT