FM radio

The FM radio is and integrated circuit, controlled by MCU software through a serial bus interface. The wires of the headset are used as poles of the antenna, and no other antenna is needed for FM radio reception. The FM radio utilizes the AV connector for its antenna connectivity. The RF input of the FM radio module is connected to the stereo audio output pins (HS_EAR_L R) via RF coupling circuitry. Wired headset connected to the AV connector works as an antenna for FM radio. The FM radio is...

Display and keyboard backlight troubleshooting Context

The device has one LED driver that provides current for both display and keyboard backlights and another LED driver that provides current for MM, ITU and side key backlights. Keyboard backlights are turned ON only in dark conditions. This is controlled by the Ambient Light Sensor (ALS). Also the brightness of the display is adjusted by the ambient light sensor. You can enable disable ALS with the help of Phoenix service software. Display brightness can be adjusted manually, if ALS is disabled....

Introduction to Bluetooth troubleshooting

There are two main Bluetooth problems that can occur This would most likely happen if the device has been dropped repeatedly to the ground. It could cause the BT antenna to become loose or partially detached from the PWB. (see next page for details about BT antenna HW and Mechanics) A malfunction in the BT ASIC, BB ASICs or Phone's BT SMD components. This is unpredictable and could have many causes i.e. SW or HW related. The main issue is to find out if the problem is related to the BT antenna...

GPS troubleshooting GPS layout and basic test points

Figure 48 GPS layout and basic test points Figure 48 GPS layout and basic test points VBat, ASIC internal LDO voltages, and clocks are available as shown in figure above. In addition to these, the following GPS signals are available on the test points U2Tx - J6202 (Activity on this pin indicates the GPS is operating.) IO_TIMESTAMP_DATRDY - J6204

Keyboard troubleshooting Context

There are two possible failure modes in the keyboard module 1 One or more keys are stuck, so that the key(s) does not react when you press a keydome. This kind of failure is caused by mechanical reasons (dirt, corrosion). 2 Malfunction of several keys at the same time this happens when one or more rows or columns are failing (shortcut or open connection). For a more detailed description of the keyboard and keymatrix, see section Keyboard. If the failure mode is not clear, start with the...

Battery information

Note A new battery's full performance is achieved only after two or three complete charge and discharge cycles The battery can be charged and discharged hundreds of times but it will eventually wear out. When the operating time (talk-time and standby time) is noticeably shorter than normal, it is time to buy a new battery. Use only batteries approved by the phone manufacturer and recharge the battery only with the chargers approved by the manufacturer. Unplug the charger when not in use. Do not...