Troubleshooting with RF-shield removed
Introduction
Troubleshooting instructed in the following chapter requires that the RF-shield lid is removed.
Voltage checking
Steps
1. Set up the main board in the module jig. The phone should be in local mode.
2. Check the following:
TP#
Signal name
Test point
Voltage (all bands)
1
VCTCXO (G7500) supply
C7501
2.5V
2
RFIC Vapaus (N7500) supply from DC/DC
converter
C7570
2.8V
3
TXFEM (N7520) supply from DC/DC
converter
C7521
1.3V-3.8V (only when transmitting and
depends on output power).
4
WCDMA PA (N7540) supply from DC/DC
converter
C7528
0.7V-3.1V (only when transmitting and
depends on output power). The value
will be 3.1V when settings as described
in the note below are used.
5
Vbat at WCDMA PA (N7540)
C7512
3.7V (Vbattery)
6
Supply input to DC/DC conv
C7527
3.7V (Vbattery)
Note:
When using settings as shown in the following Tx Control window, the result at TP4 should
be 3.1V.
RM-424; RM-564
RF Troubleshooting
Page 4 –24
COMPANY CONFIDENTIAL
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