Check for misplaced gaskets, mechanical contamination, obvious window problems.
Electrical tests, measure:
•
VBAT at C1100
•
VAUX2 2.8V at C1101
•
ALS related I2C traffic when light level changes at R2850 and R2851
•
VIO on supply side of R2850 and R2851
Component check and consider replacement of:
•
C1100 VAUX2 decoupler maybe short
•
N1100 Dipro device
Tip:
You can check for IR LED stuck "ON" by viewing the IR LED with a normal phone digital camera.
Re-tuning ALS
There is no need to re-tune ALS, since ALS default value will be written the first time the phone boots up.
Bluetooth and FM radio troubleshooting
Introduction to Bluetooth/FM radio troubleshooting
Bluetooth/WLAN antenna
The BT RF signal is routed from BTFMRDS2.2 through the WLAN module to the shared WLAN/BT antenna in
the phone's B-cover. Check the antenna pin contacts with Bluetooth/WLAN antenna.
Figure 17 Bluetooth/WLAN antenna
RM-609
BB Troubleshooting and Manual Tuning Guide
Issue 1
COMPANY CONFIDENTIAL
Page 3 – 43
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