Motorola A3100 Schematic

A3100 Troubleshooting

A3100 Troubleshooting

Guide

Guide

Service Engineeing & Optimization

Level 3 , Rev.1.0

Agenda

A. Cannot Power On
B. SIM Card Not Found
C. Display Abnormal
D. No Keypad Backlight
E. No LCM Backlight
F. Flash Light No Function
G. Light Sensor No Function
H. Cannot Charge
I. Keypad No Function
J. Touch No Function
K. Jog Ball No Function

N. ActiveSync No Function
O. Earphone Malfunction
P. Microphone Malfunction
Q. Receiver No Key Tone
R. Speaker No Function
S. RTC failed
T. Can’t Take Picture
U. Phone Hang Up
V. Auto Power On
W. Auto Power Off
X. Cannot Call Out

L. Can’t Access MicroSD Card
M. Vibrator Out of Control

Service Engineeing & Optimization
Level 3 , Rev.1.0

Y. WIFI Can’t Turn On and Test
Z. BT Can’t Turn On and Test

Can’t Power On (1)

1. Check the voltage of the Battery
Vbat (TP170) > 3.8V

2. Check the battery connector J2

Vbat (TP170)

N_KB_PWR_KE
Y

Service Engineeing & Optimization
Level 3 , Rev.1.0

Vbat (J2)

Can’t Power On (2)

3.Check the voltage of R79

R79 > 3.4V

4. Check the power-on key path

N_KB_PWR_KEY (TP165) > 2.6V
If N_KB_PWR_KEY is low, the unit will power on.

> 2.4 V

> 3.4 V

Service Engineeing & Optimization
Level 3 , Rev.1.0

Can’t Power On (3)

5. Check PM7540(U2) regulator voltage

A. VREG_MSMC1_1.2V on C4923

B. VREG_MSMC2_1.2V on C4924
C. VREG_MSME_1.8V on C4925

C

E

A

D.VREG_MSME2_2.8V on C4921
E. VREG_MSMP_2.6V on C4912
F. VREG_MSMA_2.6V on C4906

B

F
D

Service Engineeing & Optimization
Level 3 , Rev.1.0

Can’t Power On (4)

6. Check Power On Sequence
After the voltage rails are brought up, PON_RST_N is asserted by

PM7540 IC, and then the MSM7200A IC asserts PS_HOLD signal.

– PS_HOLD should be high after power on (on D522)

Service Engineeing & Optimization
Level 3 , Rev.1.0

Can’t Power On (5)

7. Try to check the external DDR and Nand Flash

1. External DDR check _ Check the External DDR by ram test tool
Pass=> The External DDR is workable
Fail => a) MSM7201A can find the memory

b) U3 is damaged

2. Flash check _ Dump the image from the damaged unit
Pass=> The External flash is workable
Fail => a) MSM7201A can find the flash

b) U3 is damaged

8. Redownload the SW

Try to redownload the SW if the main code image is damaged

Service Engineeing & Optimization
Level 3 , Rev.1.0

SIM Card Not Found

1. Do the clean boot (Mater Clear)

2. Exam whether the contact between SIM and connector is ok

3. Check the Signal of SIM interface (VCC, RST ,and Clock)
USIM ,VCC =1.8V ; SIM= 1.8V / 2.85V

USIM SLOT

4. If the signal is abnormal ,please check U2.

VREG_UIM1

R249

10K 0201

UIM1_P_DATA12

21

R247
0R 0201

UIM1_P_RESET12

UIM1_P_CLK12

2 1

UIM1_DATA

C239
33pF 0201

2 1
2 1

33pF 0201

R245
0R 0201

R246
0R 0201

C296

VREG_UIM1

UIM1_RESET

UIM1_CLK

1
2
3

4
5
6

C297
33pF 0201

C288 1uF

J17
217-02000-04 6PIN 2.1H ACT

VCC
RST
CLK

GND
NC
I/O

Fix
Fix
Fix
Fix

Fix7Fix

C289 33pF

12
11
10
9

8

Service Engineeing & Optimization
Level 3 , Rev.1.0

• White screen:

• Check LCM damage or not

• Check EMI filter (U4721) SMT

• Check panel voltage VDD 2.8V(C4921_1) & VDDIO 2.6V(C4918_1)

Display Abnormal

Service Engineeing & Optimization
Level 3 , Rev.1.0

No Keypad Light

• Check keypad LED voltage VREG_5V(C259 pin2)

• Check LED damage or not

Service Engineeing & Optimization
Level 3 , Rev.1.0

No LCM backlight

• No backlight:

1. LCM backlight damage

2. Measure R54 voltage: 15V

3. Backlight enable GPIO(Q1_2) pulled high 2.6V

Service Engineeing & Optimization
Level 3 , Rev.1.0

Flash Light No Function

• Can’t turn on flash light:

1. Check flash LED (D523) SMT and damage or not

2. Check D523_pin1 voltage: 5V

3. R425_1 & R426_1 & R427_1 pulled to low when turn on flash
led.

Service Engineeing & Optimization
Level 3 , Rev.1.0

Light Sensor No Function

– Check U39_2 voltage: 2.8V
– Check R685_1 signal pulled to low
– Measuring Vout voltage (U39_4) was change or not when light sensor

putting on different Lux environment.

Service Engineeing & Optimization
Level 3 , Rev.1.0

Cannot Charge (1)

1. Check the battery and the charger ; Only support BT-60 battery

2. Dial #06# to check the Charging status and the charging type
Power Source should be USB or Charger
Battery ID : Readable

If Power source is “No external power”, please check the charging path

Service Engineeing & Optimization
Level 3 , Rev.1.0

VBUS > 4.7V

Cannot Charge (2)

• If Battery ID is not the readable , please check whether battery is

BT60 and contact to PIN3 OF J2

•

BATT_THERMAL_GAUGING

VREG_HKADC_2.85V

R93

J2

BATT+

DATA

THERM

BATT-

476150001 4P P2 MOLEX

4
3
2
1

n.m.

40mil

R147

100R

R92

VBATT

BATT_DATA_1

BATT_THERM 4

BATTERY CONNECTOR

BGND

Service Engineeing & Optimization
Level 3 , Rev.1.0

C197
39pF

n.m.

C198
39pF

Cannot Charge (3)

3. Dial #77704# to check the gas gauge Status
AC Line : On (Has detect the charger)
Flag : Charging (The charger driver is active)
The current is minus, please check U604 circuit.

5V

Should be < 2V in charging

Service Engineeing & Optimization

Should be < 4.3V in charging

Level 3 , Rev.1.0