LG KB770 Service Manual page 89

4. TROUBLE SHOOTING
4.6.2 Checking WCDMA PAM Control Block
PAM control signal
1. PWR_DET : UMTS Tx Power Detected value (Check R101)
2. TX_AGC_ADJ : UMTS RTR6275 Tx Amp Gain Control
3. +VPWR : UMTS PAM Main Voltage ( 3V < +VPWR < 4.2V)
4. PA_ON : Enable W2100 band (C159)
5. PA_R1 : Control signals that step the active PA mode and bias
WCDMA Tx
Saw Filter
+VPWR
PA_R1(check C158)
LGE Internal Use Only
WCDMA PAM(W2100)
Bottom side
Bottom side
PA_ON: W2100 Enable
(check C159)
[Fig 4.6.2.1] Test point of the WCDMA PAM Block
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WCDMA Coupler
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