Cromax X249 Manual de usuario

X249 L2 Service Manual

1. Technical Specifications

Below given remarks are for reference only.

Particular

Remarks

Key Matrix For Flashing

N/A

Chipset

MT6260D

Android Version

N/A

Frequency

360Mhz

Network Mode

GSM 900/1800

ROM

24Mb

RAM

32Mb

Internal SD Card memory

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 L2 Service Manual

3. L2 Level trouble shooting

3.1 Structural Parts Fault

3.2 Fail to Start Up

3.3 No Ringtone

3.4 LCD Abnormal Display

3.5 Charging Abnormal

3.6 Fail to Identify SIM

3.7 No Echo, Fail to Record (But There Has Ring Tone)

3.8 Keypad Fault

3.9 Receiver Fault

3.10 Earphone Radio Silent

3.11 ExternalAudio radio Silent

3.12 No Signal

3.13 Fail to Recognize T-Flash Card

3.14 Earphone Fault

3.15 Camera ShootingAbnormalities

X249 L2 Service Manual

3.1 Structural Parts Fault

Replace structural parts by referring to mobile phone disassembly steps.

3.2 Fail to Start Up

YES

NO YES

YES

check battery installed correctly

& battery voltage >3.4v?

re-install & recharge

check the connection between LCD

module and PCBAis reliable（cable

and LCD，cable with PCBA）

reassemble

replace LCD and make bad marks

re-download

normally download, keep

parameter when download

replace PCB

make bad mark on the bad PCBA

referring to PCBA Repair Instructions

replace non-defective LCD

module to make sure if normal

fail to start up

X249 L2 Service Manual

3.3 No Ringtone

YES

check solder of speaker is

ok?

repair welding of speaker

replace speaker

check if the speaker

circuit is normal

replace speaker

amend the mainboard referring to

its repair instructions

replace the

mainboard

no ring tone

X249 L2 Service Manual

3.4 LCD Abnormal Display

YES

No YES

LCD abnormal display

check if the LED is damaged

replace LCD

analyze the circuit according to the

mainboard to make sure if it is the

mainboard problem

replace the mainboard

amend the mainboard referring to its

repair instructions

check if LCD’s welding

part is pseudo welding

weld LCD and TP’s welding parts

X249 L2 Service Manual

3.5 Charging Fault

YES

check again by replacing battery

or charger

replace battery or charger

weld connector

repair the mainboard

check if the battery and charger

connector is soldering or missing

charging fault

refer to the mainboard repair instructions

replace the main board

X249 L2 Service Manual

3.6 Fail to Identify SIM Card

YES

replace SIM card

check if SIM

connector is

soldering

weld SIM connector

check the periphery circuit of

SIM connector is normal

repair the mainboard by referring to

the mainboard repair instructions

check the connective way of

SIM card or replace SIM card

fail to identify SIM card

replace the mainboard

X249 L2 Service Manual

3.7 No Echo, Fail to Record (But There Has Ringtone)

YES

Yes YES

YES

check MIC for soldering

defect

solder or replace MIC

replace the mainboard

no echo, fail to record (but there has ring tone)

check if MIC sound

hole is jammed

replace MIC and make bad

marks on the bad MIC

replace MIC

clean MIC sound hole

check the periphery circuit of

MIC connector is normal

repair the mainboard by referring to

the mainboard repair instructions

X249 L2 Service Manual

3.8 Keypad Fault

YES

check if the keypad is

assembled correctly

reassemble the keypad

re-paste the DOME

Is structural parts related to

DOME?

amend the related structural parts

check DOME is pasted correctly

keypad Fault

analyze the circuit of the

mainboard keypad part

repair the mainboard by referring to

the mainboard repair instructions

replace the mainboard

X249 L2 Service Manual

3.9 Receiver Fault

YES

weld the pseudo-welding part

replace the mainboard

check if receiver is pseudo

welding

no voice in receiver

replace the receiver

replace receiver

check the periphery circuit

of MIC connector is normal

repair the mainboard by referring to

the mainboard repair instructions

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