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BB Troubleshooting and Manual Tuning Guide
Baseband Troubleshooting
The following sections contains guidelines how to identify and correct basic baseband related faults. Access
to normal LAB equipment (power-supply, digital multi-meter and oscilloscope) is a prerequisite for following
the guidelines. Due to the small size of the components and test-points, access to a microscope or magnifying
glass is recommended.
Introduction to BB Troubleshooting
Initial baseband troubleshooting normally involves the measurements of various power supply voltages and
control signals. The location on the most important test-points is indicated in the following figure:
Non re-workable Baseband Components
The XGold 213 V2.1S GSM controller IC D3100 is non-reworkable. This means that if failure diagnostics leads
to the conclusion of defective D3100, the PWB has to be swapped with a working unit.
Baseband main troubleshooting
The following sections will contain in-depth trouble-shooting guides for various areas of the baseband circuit.
It is assumed that a battery simulator containing a valid BSI resistance is used to supply the phone, or a valid
battery is used.
Issue 1
Figure 2 Baseband test point locations
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