Micromax Q4202 Service Manual Download

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Q4202 L2 Service Manual

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Software issue

Update software

34G antenna is fail

Change 4G antenna

RF cable connect issue

Reassemble the RF cable connect

RF Cable fail

Change RF Cable

SUB PCBA issue

Change SUB PCBA

PCBA fail

Change PCBA/Refer to L3 repair

：

FM not working

NO.

Description

Reason

Solution

FM is not working

Software issue

Update software

Earphone issue

Change earphone

Earphone connect fail

Change earphone connect

PCBA fail

Change PCBA/Refer to L3 repair

15: Receiver not working

RF cable

connector

Antenna

connector

Ear phone connector

Summary of Contents for Q4202

Page 1: ...roid 6 0 Frequency 1 1GHz Network Mode 2G GSM B 2 3 5 8 3G WCDMA B 1 8 4G FDD B3 5 40 Rom 8GB RAM 1GB Internal SD Card memory MB can support up 32GB T card Expandable Memory MB can support up 32GB T card Factory mode code 86428 Good Earpiece volume 32 Ω 15 Good Loudspeaker volume 8Ω 15 Good MIC volume 2 Ω 15 Good Vibrator volume 58Ω ...

Page 2: ...nents 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 C SERVICE DETAILS D SYMPTOMS 1 Does not power on LCD TP Earph...

Page 3: ... is fail Change Key Main PCBA issue Refer to the L3 maintenance manuals or change PCBA 2 Display issue No display NO Description Reason Solution 1 LCD TP Software issue Update Software LCD fail TP connection issue Change LCD LCD backlight circuit issue Refer to the L3 maintenance manuals or Change PCBA Side Key FPC soldering Power Key Battery connector LCD connector ...

Page 4: ...sensor holder PCBA fail Change PCBA Refer to L3 repair Inspect the sensor If it is broken change with a new one 4 G sensor not working NO Description Reason Solution 1 Proximity sensor Software issue Download software Sensor holder is not assembled well Re assemble the sensor holder PCBA fail Change PCBA Refer to L3 repair 5 Keys not working NO Description Reason Solution P sensor G sensor ...

Page 5: ...ter 2 Have charging icon But not charged Battery fail or Battery connect fail Change battery or Change battery connect FPC fail or FPC connect fail Change FPC or FPC connect PCBA fail Change PCBA Refer to L3 repair S 7 USB port issue NO Description Reason Solution 1 Cannot connect to PC Data cable is fail Change data cable USB connect fail Change USB connect Side Key FPC soldering Side Key FPC USB...

Page 6: ...annot turn on front camera Camera issue Change camera Camera connect fail Change camera connect PCBA issue Change PCBA Refer to L3 repair 9 Rear Camera not working NO Description Reason Solution 1 Colored screen when open front camera Camera issue Change camera Camera connect fail Change camera connect PCBA issue Change PCBA Refer to L3 repair 2 Cannot turn on front camera Camera issue Change came...

Page 7: ...ware Flash light fail Change flash light PCBA fail Change PCBA Refer to L3 repair 11 Vibrator not working NO Description Reason Solution 1 Vibrator Setting issue Open the vibration function Soldering issue Re soldering vibrator Soldering issue Re soldering Main FPC Rear camera connector Flash Light drive IC Flash Light ...

Page 8: ...ange main PCBA Refer to L3 repair 12 WiFi BT GPS not working NO Description Reason Solution Software issue Update software antenna fail Change antenna PCBA issue Change PCBA Refer to L3 repair 13 RF SIM Network issue NO Description Reason Solution 1 4G can not 4G did not open Open the 4G Main FPC connect Vibrator soldering Antenna connector ...

Page 9: ... RF Cable SUB PCBA issue Change SUB PCBA PCBA fail Change PCBA Refer to L3 repair 14 FM not working NO Description Reason Solution 1 FM is not working Software issue Update software Earphone issue Change earphone Earphone connect fail Change earphone connect PCBA fail Change PCBA Refer to L3 repair 15 Receiver not working RF cable connector Antenna connector Ear phone connector ...

Page 10: ...Solution 1 Single output from earphone Earphone issue Change earphone Earphone jack smudges Clean up the earphone jack Earphone jack pin is weld weak Strong weld the jack pin Earphone jack is fail Change earphone jack Main PCBA fail Change main PCBA Refer to L3 repair 17 MIC not working NO Description Reason Solution 1 Mic Setting issue Open the vibration function Soldering issue Re soldering Mic ...

Page 11: ...eaker with dust Clean speaker Assemble issue Re assemble it well Speaker fail Change speaker 2 Volume low The volume to shut down Press V transferred to the suitable volume Speaker fail Change speaker PCBA fail Change PCBA Refer to L3 repair 3 No volume The volume to shut down Press V transferred to the suitable volume Software issue Update software Speaker fail Change speaker Main FPC connect Mic...

Page 12: ...on Reason Solution 1 Sim Related Issues Software issue Update Software SIM card pin Virtual welding With the soldering iron repair welding pin SIM card fail Change SIM card PCBA fail Change PCBA Refer to L3 repair 21 Memory Card Related Issues NO Description Reason Solution 1 T card Related Issues Software issue Update Software T card pin Virtual welding With the soldering iron repair welding pin ...

Page 13: ...Q4202 L2 Service Manual Main PCBA fail Change main PCBA Refer to L3 repair Thanks For any Query or suggestion Please write to tech help micromaxinfo com ...

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