Motorola MOTOSURF A3100 User manual

Service Engineeing & Optimization
Level 3 , Rev.1.0
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
L. Can’t Access MicroSD Card
M. Vibrator Out of Control
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
Y. WIFI Can’t Turn On and Test
Z. BT Can’t Turn On and Test

Service Engineeing & Optimization
Level 3 , Rev.1.0
Can’t Power On (1)
1. Check the voltage of the Battery
Vbat (TP170) > 3.8V
2. Check the battery connector J2
Vbat (J2)
Vbat (TP170)
N_KB_PWR_KE
Y

Service Engineeing & Optimization
Level 3 , Rev.1.0
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.
> 3.4 V
> 2.4 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
D.VREG_MSME2_2.8V on C4921
E. VREG_MSMP_2.6V on C4912
F. VREG_MSMA_2.6V on C4906
AB
C
F
E
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
R249
10K 0201
2 1
J17
217-02000-04 6PIN 2.1H ACT
VCC
1
RST
2
CLK
3
GND
4
NC
5
I/O
6
Fix
7
Fix
8
Fix 9
Fix 10
Fix 11
Fix 12
C296
33pF 0201 C297 33pF 0201
UIM1_RESET
UIM1_CLK
USIM SLOT
UIM1_P_CLK12
VREG_UIM1
R247
0R 0201
21
UIM1_P_RESET12
C288 1uF C289 33pF
R245
0R 0201
2 1
C239
33pF 0201
R246
0R 0201
2 1
UIM1_P_DATA12 UIM1_DATA
VREG_UIM1
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
4. If the signal is abnormal ,please check U2.

Service Engineeing & Optimization
Level 3 , Rev.1.0
Display Abnormal
• 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)

Service Engineeing & Optimization
Level 3 , Rev.1.0
No Keypad Light
• Check keypad LED voltage VREG_5V(C259 pin2)
• Check LED damage or not