cromax x249 Service Manual Download

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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

Summary of Contents for x249

Page 1: ...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...

Page 2: ...CD 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 External Audio...

Page 3: ...tly battery voltage 3 4v re install recharge check the connection between LCD module and PCBA is reliable cable and LCD cable with PCBA and LCD cable with PCBA reassemble replace LCD and make bad mark...

Page 4: ...NO NO No YES NO YES NO check solder of speaker is ok repair welding of speaker replace speaker check if the speaker circuit is normal replace speaker OK amend the mainboard referring to its repair in...

Page 5: ...play 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 OK amend the mainboard referring to its re...

Page 6: ...NO 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 OK refe...

Page 7: ...rd 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 connec...

Page 8: ...ect 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 OK replace MIC clean MIC...

Page 9: ...orrectly 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 OK analyze the circuit of the mainbo...

Page 10: ...eld the pseudo welding part replace the mainboard check if receiver is pseudo welding no voice in receiver OK replace the receiver replace receiver check the periphery circuit of MIC connector is norm...

Page 11: ...ne replace the mainboard check if the earphone is damaged earphone radio silent OK check the pin of USB port is soldering solder the USB port check the radio circuit clean the matter check if there is...

Page 12: ...NO replace the speaker replace the mainboard check if the speaker is pseudo welding external audio radio silent OK check the phone reception circuit replace the FM antenna check if the FM antenna is d...

Page 13: ...na to the location replace the mainboard check the connection of phone antenna no signal OK check if the phone is in airplane mode abnormality adjust it to general mode check the circuit of radio freq...

Page 14: ...place the mainboard check if T card is installed correctlly fail to recognize T card OK check if T card is damaged replace the T card check the circuit of T card connector replace the T card connector...

Page 15: ...erface of earphone is soldering or broken OK check if the pin of mainboard USB interface is soldering or out of shape weld or replace the USB interface check the related circuit of USB outlet end clea...

Page 16: ...ggestion Please write to tech help micromaxinfo com reinstall check if the camera is damaged replace the camera check the welding of camera is good camera shooting abnormalities OK check the circuit o...