Micromax X249 User manual

X249 L3 Service Manual
1
1. Technical Specifications :
Please fill below information in Remarks, Below given remarks are for
reference only
Particular
Remarks
Key Matrix For Flashing
N/A
Chipset
MT6260M
Android Version
N/A
Frequency
360Mhz
Network Mode
GSM 900/1800
ROM
24Mb
RAM
32Mb
Internal SD Card memory
NO
Expandable Memory
32GB
Factory mode code
*#510838#
2. CAUTIONS
I. Flashing & Servicing must be undertaken by qualified personnel only.
II. Ensure all work is carried out at an anti-static workstation and that an
anti-static wrist strap is worn.
III. Use only approved Tools & components as specified in the parts list.
IV. Ensure all components, modules, screws, and insulators are correctly
re-fitted after servicing and alignment
V. Ensure all cables and wires are repositioned correctly if Handset
disassembled
VI. Electrostatic discharge can easily damage the sensitive components of
electronic products. Therefore, Service Centre must adhere the precautions
which mentioned above.

X249 L3 Service Manual
2
L3 Service Manual
V1.0
Documents statement:
This document is intended for use by qualified service

X249 L3 Service Manual
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personnel only.
The documents only are used for service reference.
TABLE OF CONTENT
Sectionpage
1. Product Figures.............................................................................................................................6
1-1. Exploded view...............................................................................6

X249 L3 Service Manual
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1-2. Product Main Function..................................................................7
1-3. General Specification ....................................................................7
2. Block Diagrams ............................................................................................................................8
2-1. System Diagrams...........................................................................8
2-1-1 BBIC Diagrams..........................................................9
2-2. Power Management Diagrams ....................................................11
3. Flow Chart of Troubleshooting...................................................................................................12
3-1.Baseband.......................................................................................12
3-1-1. Phone does not start up troubleshooting................12
3-1-2. SIM troubleshooting................................................14
3-1-3T-Flash troubleshooting............................................17
3-1-4. MIC troubleshooting ...............................................16
3-1-5. Speaker troubleshooting.........................................18
3-1-6. Earpiece troubleshooting........................................21
3-1-7. Vibra troubleshooting..............................................23
3-1-8. Camera troubleshooting.........................................25
3-1-9. FM radio troubleshooting........................................26
3-1-10. Display troubleshooting........................................28
3-1-11. Bluetooth troubleshooting.....................................30
3-1-12. Keyboard troubleshooting.....................................31
3-1-13. Charge troubleshooting........................................33
3.2 RF..................................................................................................35
3-2-1.GSM/DCS RX troubleshooting ................................35

X249 L3 Service Manual
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3-2-2.DCS/GSM TX Part...................................................36
4. Main Element Specifications......................................................................................................38
4-1 Baseband part ...............................................................................38
4-1-1.BBIC(U201).............................................................39
4-2. RF part.........................................................................................46
4-2-1 RF PA(U102)...........................................................46
5. Test Instructions..........................................................................................................................48
6. Glossary......................................................................................................................................49
7. Warnings and cautions ................................................................................................................52

X249 L3 Service Manual
1. ProductFigures
1-1. Exploded view
J301 duo electrical
connector
Damage caused by failure：
does not boot;power down;
U201 BBIC
Damage caused by failure
does not boo;crashes
U103 26MCrystals
Damage caused by failure：
Can not boot;
J604USB connector
Damage caused by failure：
Not charging,;
data transfer faults
U102 RF PA
Damage caused by failure：
Call fault
J802SIM &T-flash card
Damage caused by failure：
SIM card does not know,
does not know the T-flash
card
J602Headphone Jack
Damage caused by failure：
Headphones silent;
not receive FM

X249 L3 Service Manual
Part name
ITEM
Part No.
Model
QULITY
1
HQ11100139000
MT6260DA
1
2
HQ11160028000
AW5007STR
1
3
HQ11160059000
AP5200-R95MOGH0
1
J604 LCD pad
Damage caused by failure：
Does not display
Keypad
Damage caused by failure：
Invalid keys
J702 cameraPAD
Damage caused by failure：
Camera does not work

X249 L3 Service Manual
1-2. Product Main Function
SupportCamera
Music player
Support T-Flash card
2.4" QVGA LCD
Support dual SIM card
Support GSM900&DCS1800Network
Support bluetooth
Support FM radio
1-3. General Specification

X249 L3 Service Manual
2. Block Diagrams
2-1. System Diagrams
26M
5V IN
USB DM/DP
URAT TX/RX
ANT
RF_Switc
h
MT6260 (U201)
Charger IC
Battery
5PIN USB(J1102)
3.5MM Earphoen
Jack
FM Radio
Camera
Speaker
WVGA LCD
SIM 1/SIM
2
Receiver
GPS IC
Bluetooth
IC
ROM+RA
M
T-FLASH
Audio_PA
RF_Switch
RF-PA
RF-TR
Side Health
RX Filter
WIFI IC
TX PA
MI
C
26M

X249 L3 Service Manual
2-1-1 BBIC Diagrams
Application Diagram of MT6260

X249 L3 Service Manual
2-2. Power Management Diagrams

X249 L3 Service Manual
3. Flow Chart of Troubleshooting
3-1.Baseband
3-1-1. Phone does not start up troubleshooting
Power-on Sequence and Protection Logic:
The PMU handles the powering ON and OFF of the handset. There are three ways to power-on the handset
system :
①Push PWRKEY (Pull the PWRKEY pin to the low level)
②RTC module generate PWRBB to wakeup the system
③Valid charger plug-in (CHRIN voltage is within the valid range)
Pulling PWRKEY low is the typical way to turn on the handset. The Vcore buck converter will be turned-on first,
and then Va/Vio/Vm LDOs turn-on at
the same time.After that, the supplies for the baseband are ready and it will send the PWRBB signal back to PMU
for acknowledgement. To successfully
power-on the handset, PWRKEY should be kept low until PMU receives the PWRBB from BB. Besides, the
system reset ends at the moment when the
Vcore/Va/Vio/Vmare fully turned-on to ensure the correct timing and function.
If the RTC module is scheduled to wakeup the handset at some time, the PWRBB signal will directly control the
PMU. In this case, PWRBB becomes
high at the specific moment and let PMU power-on just like the on-sequence described above. This is the case
named RTC alarm.
Charger plugging-in will also turn on the handset if the charger is a valid charger. However, if the battery voltage is
too low to power-on the handset
(UVLO state), the system won’t be turned-on by any of the three ways. In this case, charger will charge the
battery first and the handset will be
powered-on automatically as long as the battery voltage is high enough.

X249 L3 Service Manual
Download troubleshooting
Main related component: BBIC(U201)，XTAL CRYSTAL（U103), MINI USB(J701)
J1102
Check the clock generation circuit
(related to BBIC)
Check the baseband circuit
(related to BBIC,keypadFPC,LCD)
Check the VBAT circuit component
(related to
U201,LCD,keypadbacklight,VIB …… )

X249 L3 Service Manual
3-1-2. SIM troubleshooting
Troubleshooting flow chart
Main related component:BBIC(U201),SIM connector(J702)

X249 L3 Service Manual
3-1-3. T-Flash troubleshooting
Troubleshooting flow chart
Main related component:BBIC(U201T-FLASH CONNECTOR(J702)
J702

X249 L3 Service Manual
SIM CIRCUIT&T-Flash circuit
From BBIC(SIM1)
From BBIC(T-card)
From BBIC(SIM2)

X249 L3 Service Manual
3-1-4. MIC troubleshooting
Troubleshooting flow chart
Main related component:BBIC(U201MIC

X249 L3 Service Manual
MIC circuit
To BBIC
From MIC

X249 L3 Service Manual
3-1-5. Speaker troubleshooting
Speaker circuit
FROM MIC
TO BBIC
FROM
BBIC
To Speaker

X249 L3 Service Manual
Troubleshooting flow chart
Main related component:BBIC(U201)SPEAKER