Nokia 3155i Operating instructions

Nokia Customer Care
3155/3155i (RM-41), 3152 (RM-61)
Mobile Terminal
ISSUE 1 07/2005 Company Confidential ©2005 Nokia Corporation
Baseband Description and
Troubleshooting

3155/3155i (RM-41), 3152 (RM-61)
Baseband Description and Troubleshooting
Page 2 ©2005 Nokia Corporation Company Confidential ISSUE 1 07/2005
Contents Page
Introduction ..................................................................................................................................................... 5
Power Up Sequence ....................................................................................................................................6
Flash Programming ........................................................................................................................................ 7
Flashing Tool .................................................................................................................................................7
Flashing Troubleshooting ..........................................................................................................................8
Flashing Phoenix Interface........................................................................................................................ 10
Audio............................................................................................................................................................... 11
How the Audio Works ..............................................................................................................................11
Audio Troubleshooting .............................................................................................................................12
Audio Phoenix Interface ..........................................................................................................................13
FM Radio ........................................................................................................................................................ 14
How the FM Radio Works .......................................................................................................................14
FM Radio Test .............................................................................................................................................14
FM Radio Troubleshooting ......................................................................................................................14
FM Radio Phoenix Interface ...................................................................................................................15
USB (Universal Serial Bus)......................................................................................................................... 17
How the USB Interface Works ...............................................................................................................17
USB Troubleshooting ................................................................................................................................18
Display ............................................................................................................................................................ 20
How the Display Works ............................................................................................................................20
Display Troubleshooting ..........................................................................................................................20
Display Backlight Troubleshooting .......................................................................................................21
Display Phoenix Interface .......................................................................................................................23
Keypad Backlight ......................................................................................................................................... 24
How the Keypad Backlight Works ........................................................................................................24
Keypad Backlight Troubleshooting .......................................................................................................24
Keypad Backlight Display Phoenix Interface .....................................................................................26
GPS................................................................................................................................................................... 27
How GPS Works .........................................................................................................................................27
GPS Troubleshooting ................................................................................................................................27
GPS Phoenix Interface ..............................................................................................................................30
UIM Card........................................................................................................................................................ 31
How the UIM Card Works .......................................................................................................................31
UIM Card Troubleshooting ......................................................................................................................31
UIM Card Phoenix Interface ...................................................................................................................34
System Connector........................................................................................................................................ 35
Accessory Detection.................................................................................................................................... 36
Battery (Lynx) Interface Circuit............................................................................................................... 37
Charging......................................................................................................................................................... 38
Common Problems ...................................................................................................................................... 39
No Communication During Flash ..........................................................................................................39
No Communication During Alignment ................................................................................................39
Failed Self Test/Calibrate .........................................................................................................................39
Mobile Terminal Not Powering Up .......................................................................................................39
Shut Down After 32 Seconds .................................................................................................................39
No Audio ......................................................................................................................................................40
Key Pads Malfunction ..............................................................................................................................40

Nokia Customer Care Baseband Description and Troubleshooting
3155/3155i (RM-41), 3152 (RM-61)
ISSUE 1 07/2005 ©2005 Nokia Corporation Company Confidential Page 3
No LCD Display ...........................................................................................................................................40
Phoenix Tools................................................................................................................................................ 41
Reference ....................................................................................................................................................... 47
Signal references .......................................................................................................................................47
Main PWB Overview .................................................................................................................................48
Test point map - bottom ..................................................................................................................... 48
Test point map - top............................................................................................................................. 49

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Baseband Description and Troubleshooting
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Nokia Customer Care Baseband Description and Troubleshooting
3155/3155i (RM-41), 3152 (RM-61)
ISSUE 1 07/2005 ©2005 Nokia Corporation Company Confidential Page 5
Introduction
The 3155/3155i/3152 baseband module is a tri-mode, Code Division Multiple Access
(CDMA), dual-band engine and is based on the DCT4.5 standard. The baseband engine
includes two major Application Specific Integrated Circuits (ASICs):
• D2200 — Universal Energy Management Enhanced Integrated Circuit (UEME IC),
which includes the audio circuits, charge control, and voltage regulators
• D2800 — Main phone processor, which includes system logic for CDMA, two
Digital Signal Processors (DSPs), the Main Control Unit (MCU), and the memory
The BL-6C Li-ion battery is used as the main power source and has a nominal capacity of
1070 mAh.
Even though the Bluetooth, Camera, Camera flash, External Display and MMC
components are on the ASICs, they are not used in the 3155/3155i/3152 baseband
module.

3155/3155i (RM-41), 3152 (RM-61)
Baseband Description and Troubleshooting
Page 6 ©2005 Nokia Corporation Company Confidential ISSUE 1 07/2005
Power Up Sequence
When the mobile terminal is dead or jammed always check the Power Up Sequence of
the baseband area. Verify all regulator and reset signals are correct to ensure proper
power up of UEMEK and D2800 (see Figure 1).
Figure 1: Power-on sequence and timing
Reference signal
PwrOnX
Charger Detection
RTC
UEMRSTX
VCORE
VFlash1
VIO
VANA
VR3
19.2MHz Clk
PURX
t1 t2 t4t3
Sleep Clock
t1 = 20ms
t2 = 200ms
t3 = 500us
t4 = 20ms
Reset mode is entered and the watchdog
starts. VCORE enabled, providing power to
D2800.
End of settling time (only if Vbat > Vcoff+_);
VFLASH1 regulator enabled
VR3, VANA, VIO enabled; PURX held
LOW
D2800 processor, MCU, and DSP are
reset; VCTCXO regulator forced on

Nokia Customer Care Baseband Description and Troubleshooting
3155/3155i (RM-41), 3152 (RM-61)
ISSUE 1 07/2005 ©2005 Nokia Corporation Company Confidential Page 7
Figure 2: Measured power-on sequence and timing Flash Programming
Flash Programming
Flashing Tool
Flash programming is done through the VPP, FBUSTX, FBUSRX, MBUS, and BSI signals
BSI = Used to indicate to MCU that the prommer is connected and mobile terminal is in
flashing mode
MBUS = Used as clock signal for synchronizing the serial communication between the
prommer and MCU
FBUSRX = Data to UPP
FBUSTX = Data to prommer
VPP = 0v/ 1.8v/ 12v (read only/normal op. or slow programming/fast programming)

3155/3155i (RM-41), 3152 (RM-61)
Baseband Description and Troubleshooting
Page 8 ©2005 Nokia Corporation Company Confidential ISSUE 1 07/2005
Figure 3 shows the DA-47 flashing tool and Module Jig MJ-57.
Figure 3: DA-54 Flashing Tool and MJ-57 Module Jig
Flashing Troubleshooting
When troubleshooting flashing problems, first make sure the signals from the FPS-8 to
the D2800 processor are functioning properly before replacing any component. Once
signals between production test points and the D2200 and the D2800 processor have
been checked, verify that the interface between D2800 processor and flash is correct.
While all the signals between D2800 processor and flash are not visible, the available
signals will help identify the components that may need to be replaced.
Figure 4: Flashing diagram
When troubleshooting the flashing to diagnose and determine faulty components, check
the signals in the following sequence:
• Make sure the signals from the tester are making contact with the production
flash pads.
• Use Phoenix External to either program or erase a mobile terminal that is not
working. This allows you to monitor the signals form the FPS-8 to the D2800
processor.
FBUS TxO
MBUS
FBUS RxO
Production
Test Points
UEMEK D2800 Flash
Memory
MBUS Tx
MBUS Rx
FBUS Tx
FBUS Rx
FLSCSX
EXTRDX
EXTWRD
FLSCLK
D2200 D2800 D3001
Signal voltage
levels are 2.78V Signal voltage
levels are 1.8V Signal voltage
levels are 1.8V
FBUS TxO
MBUS
FBUS RxO
Production
Test Points
UEMEK D2800 Flash
Memory
MBUS Tx
MBUS Rx
FBUS Tx
FBUS Rx
FLSCSX
EXTRDX
EXTWRD
FLSCLK
D2200 D2800 D3001
Signal voltage
levels are 2.78V Signal voltage
levels are 1.8V Signal voltage
levels are 1.8V

Nokia Customer Care Baseband Description and Troubleshooting
3155/3155i (RM-41), 3152 (RM-61)
ISSUE 1 07/2005 ©2005 Nokia Corporation Company Confidential Page 9
• When flashing or erasing the mobile terminal, monitor the MBUSRX and FBUSRX
signals from the UEMEK to the D2800 processor for a signal at these points. If
either signal does not appear, check the signal at the production test points. If
the signal is ok, check the UEMEK. Re-flow or replace the UEMEK.
• Next make sure that the D2800 processor sends information back to the FPS-8
through the FBUSTX signal. If there is no activity at this point re-flow or replace
the processor.
• If all points are ok, make sure the FBUSTX signal goes through the UEMEK by
measuring the signal at the FBUSTXO at production test points. If there is no
signal present, reflow or replace the UEMEK.
• If all signals form the production test points to the UEMEK to the D2800
processor are functioning, it is safe to assume that the UEMEK and D2800
processor are ok.
Continue troubleshooting the D2800 processor as it interfaces with the flash. Verify the
available signal interface between the processor and flash as follows:
• Erase or program the mobile terminal to monitor the D2800 processor and flash
interface as verified earlier using Phoenix External.
• When programming or erasing the mobile terminal, monitor the FLSCSX, FLSCLK,
EXTRDX, and EXTWRX flash signals. If any of these signals has no activity, re-flow
or replace the D2800 processor.
• If all signals are ok, re-flow or replace the flash.
If additional troubleshooting is still required to determine why the mobile terminal
cannot be flashed, verify all the baseband voltages. In particular, check the VIO since it is
one of the regulators that powers the flash chip.

3155/3155i (RM-41), 3152 (RM-61)
Baseband Description and Troubleshooting
Page 10 ©2005 Nokia Corporation Company Confidential ISSUE 1 07/2005
Flashing Phoenix Interface
Run EZ Flash in Phoenix to flash the mobile terminal.
Figure 5: EZ Flash in Phoenix
.
Figure 6: EZ Flash in Phoenix