LG KU730 Service Manual page 78

4. TROUBLE SHOOTING
4.5.2 Checking WCDMA PAM Control Block
• PAM control signal
1. HDET_EN : WCDMA Tx Power Detect IC(U105:HDET) Enable
2. TX_AGC_ADJ : WCDMA RTR6250 Tx Amp Gain Control
HDET_EN
PA_ON
TX_AGC_ADJ
PA_ON must be HIGH(over 2.5V)
PA_FET_N must be LOW if the max Tx power is set (lower than 0.5V)
PAM_OUT
PAM_IN
PAM OUT must be over 16dBm
PAM IN must be over -5dBm
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