Nokia 1508i, RM-430 Baseband Description and Troubleshooting

1508i(RM-430) Baseband Description and Troubleshooting

Nokia Customer Care

1508i (RM-430)

Mobile Terminal

Baseband Description and

Troubleshooting

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1508i(RM-430) Baseband Description and Troubleshooting

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Contents

BB Troubleshooting 1508i

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1508i(RM-430) Baseband Description and Troubleshooting

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1508i system brief introduction

1508i main features

1508i is a CDMA phone based on the VIA platform.

1) CDMA PCS support only

2) FM stereo radio

3) Compliance to USB 2.0 (full speed)

4) R-UIM card

The main devices

Device Model number Supplier

Baseband processor CBP 5.6 VIA PMU ACT5805 Active Memory S71GL064NB0BFW0Z0 SPANSION LCD BYD4205T BYD FM Stereo radio Si4702-B16-GM SILICON LABS

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1508i(RM-430) Baseband Description and Troubleshooting

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Figure 1 Component layout (Bottom)

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1508i(RM-430) Baseband Description and Troubleshooting

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System Block Diagram

System Description

1508i is a CDMA (PCS band) Mobile Phone. The phone supports:

- forward and reverse link data rates of up to 153.6kbps.

- 4GV vocoder

- 1.47”(128*128) CSTN LCD

- Stereo FM radio

Platform Introductions

CBP 5.6

VIA Telecom’s CBP 5.6 single-chip CDMA Base Band Processors provide a complete 3G CDMA2000® 1X (Release 0) solution. They are designed to meet or exceed

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the specifications of mobile stations for worldwide 3G CDMA systems as specified by CDMA2000® 1X (Release 0) standards and are backward-compatible to IS -95.

CBP 5.6 integrates three processor subsystems:

ARM7TDMI® Control Processor (CP) supports the protocol stack, user interface, and hardware interface processing. Two TeakLite® Digital Signal Processors (DSPs): one DSP supports CDMA modem processing, the second DSP supports CDMA voice processing

The main features of the CBP 5.6

z Supports CDMA2000® 1X (Release 0) z Backward compatible to IS-95 standards z Supports IS-2000 Quick Paging Channel for improved standby time z Support for multiple CDMA band classes (Band Class 0/US-Cellular,

Band Class 1/US-PCS, Band Class 3/JTACS, Band Class 4/KoreanPCS); support for additional band classes which can be added upon customer request

z Special purpose logic provides signal processing, modulation,

demodulation, hardware accelerators and interfaces for keypad and display

z Mixed signal circuitry for the Rx analog-to-digital converter (ADC), Rx

filter, Tx digital-to-analog converter (DAC), Tx filter, internal PLLs, voice codec, auxiliary ADCs, auxiliary DACs, RF control and 32.768 kHz oscillator

z Support for forward and reverse link data rates of up to 153.6 kbps

(CBP5.6 only).

z

Dual supply voltage (1.8 V digital core, 3.0 V analog and 3.0 V digital

I/O)

z 3.0 V or 1.8 V external memory interface

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1508i(RM-430) Baseband Description and Troubleshooting

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z USB support (12 Mbps) z Removable User Identity Module (R-UIM) compliant with IS-820 z 32-voice polyphonic ringer

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The interface of the CBP5.6 is described in the following diagram. Receive and transmit interfaces for CBP 5.6 provide analog I and Q signals and support superheterodyne radio and direct conversion radio design. The CP external-memory interface supports 3.0V or 1.8V, the address bus supports 16-bit address which can support three to six external devices via chip selects. CBP 5.6 includes 48 GPIOs and interrupts, some of which are multiplexed with other functions. All GPIO pins are in input state by default and use a large pull-up or pull-down resistor value to minimize the current drain. The USB port supports data rates of up to 12Mbps, the USB analog drivers and

48.00MHz PLL are integrated into CBP 5.6, the control processor manages the USB function. Two independent serial-peripheral interfaces are provided on CBP 5.6: one is for RF control and the other is for general-purpose use. The R-UIM interface supports 3V UIM cards and consists of five pins, these pins are multiplexed with another function. The CP manages the R-UIM function. Five independent PDM DACs are supplied on the CBP 5.6 chip. Three of the outputs are dedicated to radio-control signals for Rx automatic gain control (AGC), Tx AGC, and automatic frequency control (AFC). The fourth and fifth PDM outputs are spares. The PDMs are 12-bit DACs and have a guaranteed output range of 0.2 V to 2.5 V. The 12-bit auxiliary ADC supports eight independent external channels on pins AUXADC [7:0]. There are also eight internal channels used to measure internal analog voltages. The input voltage range is 0.2 V to 2.7 V. The conversion time is 156 µsec. The typical uses of the external

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1508i(RM-430) Baseband Description and Troubleshooting

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auxiliary ADC channels include: Tx RF power measurement, battery voltage, and temperature sensors.

The baseband is powered by the following PMU ACT5805 regulators:

VDD_DIG = 3.0v VDD_CORE = 1.8v VDD_TXPLL = 3.0v VDD_TCXO = 3.0v VDD_ANALOG =3.0v VDD_RX = 3.0v VDD_TX = 3.0v VIB_P=2.8v~3.6v

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Power Up

The mobile terminal uses the power key and a charger to power up.

Power Key

When the power key is pressed, the PMU enters the power-up sequence. Pressing the power key causes the POWER_ON pin to VBAT. The POWER_ON signal is not part of the keypad matrix. The power key is connected to the PMU. This means that when the power key is pressed, an interrupt will be generated to the CBP in order to power on the CBP. The CBP

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1508i(RM-430) Baseband Description and Troubleshooting

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reads the PMU IC’s interrupt register and notifies that it is a KPADPWR_N interrupt. The CBP reads the status of the POWER_ON signal using the PMU’s (I2C) control bus. If the POWER_ON signal stays High for a certain time, the CBP accepts this as a valid power-on state and continues with the software baseband initialization. If the power key does not indicate a valid power-on situation, the CBP powers off the baseband

.

Charger

Charging is controlled by start-up charging circuitry in order to detec t and s tart charging in case the main battery is not full and the PMU has no supply.

Power Off

While the PS_HOLD signal from the CBP is high, and the PMU IC is in power-on status. The PMU continually monitors three events that could trigger a power-off sequence: z The CBP drives the PS_HOLD signal low responding to the pressing

of the keypad power button.

z Battery voltage drops below power off threshold (Battery Voltage <

3.2V).

z The PMU IC die temperature exceeds its “severe” over-temperature

threshold.

Power Distribution

In normal operation, the baseband is powered by the mobile terminal‘s battery pack. The battery pack consists of one lithium-ion cell with a capacity of 860 mA and safety and protection circuits. The PMU ACT5805 IC controls the power distribution for the whole mobile terminal, which includes the baseband and the RF regulators, but excludes the RF power amplifier (RF PA) which drains power from the battery

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1508i(RM-430) Baseband Description and Troubleshooting

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directly. The battery provides power directly to the following parts of the system:

· PMU ACT5805

· RF PA

· Vibrator

· Keyboard & LCD backlights

· Audio Amplifier

The heart of the power distribution is the power control block inside the PMU ACT5805. It includes all the voltage regulators and feeds the power to the entire system. The PMU ACT5805 handles hardware power-up functions so that the regulators are not powered on and the power up reset (NRST) is not released if the battery voltage is less than 3.2 V.

The baseband is powered by the following PMU ACT5805 regulators:

Rating

Regulator Voltage

Notes

Current

Always enabled except during

VDD_DIG 3V 250mA

power-off mode

Enabled only when the system is

VDD_CORE 1.8V 150mA

powered on (Off during sleep and

power-off modes)

Enabled only when the

VDD_TXPLL 3.0V 80mA

transmitter is on

VDD_TCXO 3.0V 80mA

KEYPAD_LED 3.0V 100mA

Enabled only when the system is

powered on (Off during sleep and

power-off modes)

Enabled when the system is

powered on, or the keys are

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1508i(RM-430) Baseband Description and Troubleshooting

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pressed,etc.

VDD_RX 3.0V 80mA Enabled when the receiver is on

Enabled when the transmitter is

VDD_TX 3.0V 150mA

on

Enabled only when the system is

VDD_VIBE 3.0V 150mA

powered on (Off during sleep and

power-off modes)

Clock Distribution

The CBP derives its internal clock from two clock inputs, TCXO and SLEEP_CLK. The main clock signal for the baseband is generated from TCXO. (Temperature-compensated crystal oscillator) The CBP’s TCXO clock input supports the frequency 19.2 MHz +/-2ppm. An integrated PLL and digital divider inside the CBP are used to create the required clock for the system. The SLEEP_CLK provides a 32.768 kHz +/-20ppm clock source to drive the CBP controller into sleep mode. At this mode, the TCXO is disabled.

TCXO

The CBP device integrates a phase-locked loop from the TCXO clock input. The PMU optimizes TCXO operation that enables and disables appropriate circuits in the proper sequence. The controller is enabled by the OSC_EN signal from the CBP. .

SLEEP Crystal Circuit for 32.768 kHz

The 32.768 kHz crystal oscillator is the primary SLEEP clock source when TCXO clocks are disabled to save power.

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Charging Operation

Battery

The 1508i uses a Lithium-Ion cell battery with a capacity of 860mA.CBP reads the resistor inside the battery pack on the BSI line to identify the battery size. Different charging algorithm will be used for different battery sizes. The resistors are connected to the BSI pin inside the battery connector.

BSI= BATT_DET

Charging Circuitry

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Display and Keypad

The mobile terminal uses light-emitting diodes (LEDs) for liquid crystal display (LCD) and keypad illumination. There are two white LEDs for the LCD and two LEDs for the keypad. KEYPAD_LED is the signal used to drive keypad LEDs. LCD_BL_EN is the signal used to drive LCD LEDs. The mobile terminal uses a color LCD. The interface uses a parallel bus to transfer the Command/ Data between CBP and LCD.

Troubleshooting

First, carry out a thorough visual check of the module. Make sure in particular that:

• There is no mechanical damage.

• Soldered joints are OK.

• ASIC orientations are OK. The following hints should help find the cause of the problem when the circuitry seems to be faulty. Troubleshooting instructions are divided into the following sections:

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1508i(RM-430) Baseband Description and Troubleshooting

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·‘Power Does Not Stay ON’

·“Charger Faults’

·‘Audio Faults’

·‘Display Faults’

·‘Keypad Faults’

·‘No Vibration’

·‘Series/USB Interface Disabled’

·‘UIM Card Unreadable’

Note:

• CBP5.6 is underfilled and can not be replaced.

• The Shielding Case Assy can not be reused after removal.

• After using the heatgun, the domesheet needs to be replaced.

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Repair Function in Power-off Status (refer to PMU Circuit)

• The current status resulting ‘Power Off” could be divided into three

cases:

• Big current, no current, no holding current. Case One.

Big current appears when power is fed to Vbattery or “power on” key is pressed on the handset.

Check if the following voltages of PMU are normal: VDD_DIG, VDD_CORE, VDD_TXPLL, VDD_TCXO, VDD_RX, VDD_TX,

If the voltages are abnormal, check the fault reason.

Case Two.

If current is zero, check CN703and C1011,C1012,C1013,C1014,C1015,C1016.If there is no power output, PMU is defective. Phone cannot be repaired and must be replaced.

Case Three.

Raise the voltage of PS-HOLD, and measure every output voltage of PMU, The reference clock Power-on needed is KHZ.19.2MHZ etc. such as :VDD_DIG,VDD_CORE,VDD_TXPLL,VDD_TCXO,VDD_RX,VDD_TX ; Check if the clock TCXO（19.2MHz）and RTC（32.768KHz）are normal. If the signals are abnormal, please check the fault reason; If it is normal, please check the welding of CPU and Flash and perform welding or replacement. (Replacement includes Flash Updating).The welding of the display panel connector should also be checked, becaus e the shortcut of the parallel data signal and Read & Write signal on the display panel connector will lead to failure of CPU in invoking the programs of FLASH.

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1508i(RM-430) Baseband Description and Troubleshooting

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Power Does Not Stay ON Troubleshooting

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1508i(RM-430) Baseband Description and Troubleshooting

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PMUACT5805 circuits

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1508i(RM-430) Baseband Description and Troubleshooting

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No Sound in Earpiece & Microphone Check (refer to MIC headset, Audio PA Circuit design)

Enter the test mode ’LoopBack’ by pressing test order #0000# then press ‘calling key’ when the No Sound in Earpiece & Microphone message appears.

1. If the test result is normal, it indicates that the ‘Loopback’ circuit (receiver & microphone) is OK in hardware connection; The bottom socket should be checked whether it has been short circuited to the ground; If it is grounded, the mobile phone software will detect that the earpiece is in the Insert Mode, which sets the mobile phone in earpiece mode, and it means both of the earpiece and the microphone do not work.

2. On the Other hand, if the test result shows that the ‘Loopback’ is abnormal, the fault reason should be picked up from the earpiece and the microphone. Dial 112 emergency call and diagnose the fault: If the sound works, the microphone Mic is directed wrong, or it indicates the receiver does not work properly.

3. In the case the Contact Connection is adopted between the earpiece and the Mic of the mobile phone, test if the connection works.

• If there is a fault in telephone receiver, first try to recover the earpiece

by performing the experiment described above. If it still doesn’t work, Audio PA chip or CPU chips may be damaged from poor welding or injury. The chips then should be repaired by re-welding or replacement.

• If there is a fault in Microphone, first try to recover the earpiece by

performing the experiment described above. If it still doesn’t work, Audio PA chip or CPU chips maybe damaged from poor welding or injury. The chips then should be repaired by re-welding or replacement.

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1508i(RM-430) Baseband Description and Troubleshooting

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Audio Faults Troubleshooting

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1508i(RM-430) Baseband Description and Troubleshooting

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1508i(RM-430) Baseband Description and Troubleshooting

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MIC Circuit Design

Headset Circuitry

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1508i(RM-430) Baseband Description and Troubleshooting

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Audio PA Circuitry

Display Faults

Display fault items are listed as following: white panel, backlight N/G, display

flowery or color abnormal. First check if the LCD is well connected with the LCD,

if not well connected or poor welding, replace the connection or weld it again. If

the connection is good, the data input on LCD and its operation voltage should

be checked. If the results show poor condition, then find the fault reason and do

the replacement and double welding. More attention should be payed on CPU

cold welding.

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1508i(RM-430) Baseband Description and Troubleshooting

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Display Faults Troubleshooting

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1508i(RM-430) Baseband Description and Troubleshooting

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Keypad Faults (refer to Keypad circuitry)

First check if the keypad is well located: If not, locate it again or do the

replacement.

Find out if there are faulty keys. Illustrated by the interface circuit of the

Keypad, except the PHONE-ON Key which is connected to the PMU

Chip separately , all the keys work in groups(R0 to R5 and C0 to C3)

and each group use one CPU’s GPIO. Thus the faulty running GPIO

can be located by confirming the faulty keys. Further, short circuited

signal or cold welding of the CPU should be modified or replaced.

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1508i(RM-430) Baseband Description and Troubleshooting

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Keypad Faults Troubleshooting

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1508i(RM-430) Baseband Description and Troubleshooting

Keypad Circuitry

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Vibrator Faulty reference to the Vibrator Circuit Design)

First check whether the vibrator is connected well with the PWB.

Set the digital power at 3.0V (The voltage value may be changed by model of the

vibrator). The Power should fall on the two control points of the vibrator, and then

observe whether it works. If the Vibrator does not work, please do the replacement;

If the vibrator works, which means no control signal arrivals, do the check against he

current’s flow.

In addition, No Vibration after installation usually dedicates the welding

excursion of the vibration. Check with it and see if it has been connected

properly.

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1508i(RM-430) Baseband Description and Troubleshooting

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No Vibration Troubleshooting

Vibrator Circuit

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1508i(RM-430) Baseband Description and Troubleshooting

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C

hecking Series

1. Check if the bottom insert of the mobile phone is well connected.

2. Check if the COM of the computer is well connected.

And confirm the configuration of the COM setting.

3. Check the welding of the mobile phone connection, whether there is

foreign impurity or not.

4. Check if the Rx, TX, DTR and etc. are shortcircuited to the ground.

5. Check the welding of the CPU.

Series Interface Disabled Troubleshooting

Checking USB

6. Check if the bottom insert of the mobile phone is well connected.

7. Check if the COM of the computer is well connected and confirm the

configuration of the COM setting.

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8. Check the welding of the mobile phone connection, whether there is

foreign impurity

9. Check if the VBUS, D+, D- and etc. are in their normal status.

10. Check if the USB over-Voltage IC works normally.

11. Check the welding of the CPU.

USB Interface Disabled Troubleshooting

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USB Circuitry

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FM Faults Troubleshooting

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1508i(RM-430) Baseband Description and Troubleshooting

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UIM Card Unreadable troubleshooting

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Charging Faults Troubleshooting

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Nokia 1508i, RM-430 Baseband Description and Troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual