Motorola MOTORAZR V3i User manual

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Date: 04.09.2006
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Troubleshooting Guide V3i and V3_05 – Level 3/4
This document was created to assist analyzers troubleshooting Motorola GSM Phones. All
Information was collected during the repair in the Repair Entitlement Group Flensburg

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Contents
Requirements
-System requirements
-Basic information on troubleshooting Motorola GSM Phones
-Advice on working with lead soldering/underfilm
Top Ten defect parts
Troubleshooting Guide
-ALTxx
-AUDxx
-ACCxx
-BATxx
-CHGxx
-CPRxx
-DAPxx
-DIMxx
-DISxx
-FTRxx
-MKPxx
-OPRxx
-SIKxx
-SIMxx
-TONxx
Follow up faults caused by failed repair actions
Flash procedures
-Software Update
-Recovering Flash memory in Forced Flash Mode
-Image Flash

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Requirements
-System Requirements
-Power Supplies,Oscilloscope,Spectrum Analyzer, Test Set
-Preheater for lead free soldering/solder machine for BGA`s
-Microscope
-Repairstudio/Radiocomm
-Field Service Bulletins
-FASTT
-Block diagrams/Schematics
-PinNetFinder FLVIEW
-Basic information on troubleshooting Motorola GSM Phones
-Make sure all contacts are clean, especially the EMU-Connector
-Use newest approved Software
-RESET/MASTERCLEAR can fix some issues
-Do a visual inspection on customer abuse/liquid contamination
-The Processor U800 replacement always requires a Flash IC replacement
-Advice on working with lead free soldering/underfilm
-Use lead free flux
-Use preheater(HAKKO 853)
-Use tool for resolder (PA and U250), part no 19500950 (Pre soldering Fixture)
-
part no 99991966 (Metal stencil GSM Edge)
part no 19501966 (Mounting Bracket GSM
Edge)
part no 99991964 (Metal stencil for PA)
part no 19501964 (Mounting bracket for PA)
Use of preheater

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Top Ten defect parts
The following is an analysis summery of the V3i and V3_05 repaired during NPI process by
the Repair Entitlement Group CSS Flensburg

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Troubleshooting Guide
First Step
Please make sure beforehand, that the problem at hand is not a SW related issue that can be
solved with a 1FF update and a Master Reset/Clear. In many cases a simple Master Reset can
already fix the problem.
The following section is meant to be a help in troubleshooting problems which are already
Identified as PCB related
ALT01 Alert – Ring tone, no
ALT02 Alert – Ring tone, low
ALT03 Alert – Ring tone, noise/distortion
Check ALERTP and ALERTM -- both should have around 2.1Vdc
-If not check L1422/L1423/ for broken connection,C1424 for low resistance
VR1400/VR1422/VR1423 for shortcut to ground
-check PCB for open tracks from ALERTM to U900-V10 /ALERTP to U900-U8
- you can either use“Repair-Studio” to switch on 1 kHz tone to the alert to check for
open tracks, but be careful: You can have 1 kHz and audio in call at
ALERTM/ALERTP, but no alert-tone, because the ATLAS is defect!
if 1kHz is ok, replace Atlas (U900). Please use underfilm for U900.
The alert signal is converted to analog and amplified by the ATLAS, but generated by the
Neptune, so if the ATLAS alert audio path is ok there could be a problem with the
Neptune not generating the alert signal.
ALT11 Alert – Vibrator, no
ALT12 Alert – Vibrator, weak
Turn on vibrator using Repair Studio/ Radiocomm. Measure V_VIB – should be about
2Vdc.V_VIB is provided directly by the ATLAS (U900).To verify if the vibrator is defective
a simple method is to provide a supply voltage (1Vdc should be enough) via test probes
directly on the vibrator G1 (radio in off state!).It should be rotating, if not replace the vibrator
G1.Check the diode D_VIB . Otherwise replace ATLAS (U900). Please use underfilm for
U900.

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Vibrator G1
D_VIB
V_VIB
ac tive:2V
from ATLAS GND
AUDxx Audio problems
First step on every audio related problem is to identify which audio paths are affected. If the
audio signals in a loop are ok, there could be an audio problem in a network call. This could
be due to an ATLAS or Neptune related defect.
AUD01 Audio – Earpiece, no
AUD02 Audio – Earpiece, low
Check HAND_SPKRM at C1014 and HAND_SPKRP at C1015. Both should have around
1.4Vdc offset voltage, if audio-loop is switched on and additional up to 2,7Vpp at 1 kHz, if
test-tone is switched on.
-If not check J2 for solder shorts,C1014/1015 for low resistance
-(eventually) check PCB on open tracks from J2 to C1014/U900-T6 and J2 to
C1015/U900-R7
-If ok, replace Atlas (U900). Please use underfilm for U900.

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AUD07 Audio – MIC, No
AUD08 Audio – MIC, Low
Set radio in audio loop using Repair Studio/Radiocomm
-check MIC BIAS1 at C1207 – should be around 1,75Vdc
-if not check C1207/1206/1201/1202/1200/1203 for low resistance
-if ok check MIC_IN_M at C1206 while blowing into the microphone to see the
audio signal caused by the blowing
-if not replace microphone
-if ok replace ATLAS (U900) Please use underfilm for U900.
ACC07 -- Accessory - Bluetooth module, no Operation
Verify it Bluetooth can be activated and is able to find other Bluetooth devices.
-If not, check oscillator Y301 (26MHz).
-check the BLUE_WAKEB
-replace U300
-If not, replace Neptune (U800)
Note: You can only measure the signals, when Bluetooth is activated.
pulsed signal

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BAT02 – Battery life short
BAT03 – Battery cant turn on phone
CHGxx -Charging problems
TON01 – No Turn On (draws high current)
In probably most cases these problems are caused by an off current. First verify whether there
is an off current. If there is an off current, it should be checked whether the device draws
current via battery and/or via external connector.
In case of an off current via battery there should be a low resistance (less than ~200 Ohm)/ or
a short from BATT_P (J2-Batt) to GND.
To localize the defective part causing the short/ low resistance a simple way is to freeze the
board with a coolant-spray, supply a battery voltage from a power supply using micro clamp-
type test probes, and see which parts are getting warm. This is a very basic and essential
method to troubleshoot off current / high current consumption failures.
The power supply (for BATT_P) should be set to 3,7V with current limitation to 2A.We
strictly recommend using the Power Supply Unit Current Drain Meter to check the current
drain of the PCB.
Shields covering suspected parts should be removed before freezing the PCB.
The PCB should be handled with care. After removing the shields the PCB should be given
some time to cool down slowly before freezing it to far below zero to avoid physical stress to
the multilayer PCB with lead soldered parts.
In some cases the part, which is getting warm has an internal short itself. After removing this
part the off current should be fixed. For verification check off current or measure resistance
BATT_P (J2-Batt) to GND.A new part can be placed.
If the short / low resistance remains after replacing the part which getting warm, it should be
checked which signals / voltages this part provides. In the most cases this part will provide a
supply voltage to other parts which can also get warm due to an internal short.

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To find out a defective part an easy way is to use the Flensburg Layout Viewer to follow the
signal (check for SHORT_RESISTORS after which the signals possibly could have a changed
name), and remove the parts one after another, until the short is gone.
Most frequent parts with internal shorts causing these kinds of failures are the PA (U50), the
ATLAS /U900), the Q960, and the Neptune (U800)
1. Example:
- BAT00 -- radio draws about 250mA in standby, no off current
- U900 are getting warm
- U900 provides BR 3,85V for PA (using Flensburg Layout Viewer)
- GSM-PA is also getting warm (see below)
- U50 itself has an internal short
Defective U50
2. Example:
- BAT02—radio draws about 40mA off current
- Only ATLAS is getting warm (checked with coolant-spray); nothing else
- ATLAS draws off current-> replace ATLAS. Please use underfilm for U900.

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BAT04 – Invalid Battery
-Verify OWB (J3_BATT-2) while PCB is connected to EMU_USB cable. It should be
2.775V.Check also J3 for broken part.
-If it is low, check D1426 and R1200 (4,7k).
-If they are ok check U250 inform to make U250 cold with coolant-spray.U250 could
have internal interruptions at product code 03/06 to 27/06!!!!
-If the voltage OWB stays low, it should be a problem with the Neptune (U800).
CHG01 – Does not charge
If the phone seems to charge, but battery meter stays at low level, check whether there is a
high current consumption or an off current via battery. If so please follow troubleshooting as
described in the BATxx section of this document.
If there no off current, check the whole path for the charging current. Make a battery/charger
phasing to see, if only the charger current or also the battery-phasing is affected. For a charger
current problem only:
Check Q903, Q904, Q905, Q906, R904, R905, R910, J3 for broken contact
if ok replaces ATLAS (U900). Please use underfilm for U900.
For additional battery phasing problems (for example: battery sense or battery meter) replace
ATLAS (U900)
Battery Thermistor problem
Check BATT_Therm at J3-3, it should be 2,7Vdc.If it is not check R990, R991 and C990 for
low resistance.
If ok replace the ATLAS (U900) .Please use underfilm for U900