Wcdma Transmit Block - LG -V909DW Service Manual

4.4 WCDMA Transmit block

4.4 WCDMA Transmit block
To check WCDMA TX block, there are 6 procedures.
To check WCDMA TX block, there are 6 procedures.
1. Battery Level check
1. Battery Level check
Check if main battery voltage range is within 3.6V and 2V at C108(TP1), C126(TP2)
A. Check if main battery voltage is 3.6V to 2V at C108(TP1), C126(TP2)
2. Power level check at Antenna switch.
2. Power level check at Antenna switch.
Suppose that UE output power is max
Suppose that UE output power is max
Check if Maximum output power is over 21dBm
LGE Internal Use Only
Check Power level Check Power level
Wrong Power level Wrong Power level
BATT Power okay? BATT Power okay?
BATT Power okay? BATT Power okay?
TP1, TP2 TP1, TP2
TP1, TP2 TP1, TP2
No – Check Power No – Check Power
yes yes
Are TP3,4,5 Are TP3,4,5
is TP3 or 4 or 5 is TP3 or 4 or 5
over 21dBm? over 21dBm?
over 21dBm? over 21dBm?
no no
no no
Are TP6, 7, 8 Are TP6, 7, 8
Is TP6 or 7or 8 Is TP6 or 7or 8
over 22dBm? over 22dBm?
over 22dBm? over 22dBm?
no no
no no
Are TP9, 10, 11 Are TP9, 10, 11
Is TP9 or 10 or 11 Is TP9 or 10 or 11
over 3dBm? over 3dBm?
over 3dBm? over 3dBm?
no no
no no
Are TP12, 13, 14 Are TP12, 13, 14
Are TP12, 13, 14 Are TP12, 13, 14
over 4dBm? over 4dBm?
over 4dBm? over 4dBm?
no no
no no
Check MDM Baseband Block Check MDM Baseband Block
Check MDM RF Block Check MDM RF Block
Chart 3 WCDMA Transmit Block sequence
Chart 3 WCDMA Transmit Block sequence
yes yes
no no
Power Supply is okay Power Supply is okay
Check power Check power
yes yes
yes yes
Duplexer is okay Duplexer is okay
Check FEM Check FEM
yes yes
yes yes
PA is okay PA is okay
Check Duplexer Check Duplexer
yes yes
yes yes
SAW Filter is okay SAW Filter is okay
Check Power Amplifier Check Power Amplifier
yes yes
yes yes
MDM Output is okay MDM Output is okay
Check SAW Filter Check SAW Filter
- 71 - Copyright © 2011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Only for training and service purposes