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Q4202 L2 Service Manual

Key is not work

Key fail

Change Key

Key is not assembled well

Re-assemble

PCBA issue

Change PCBA/Refer to L3 repair

：

Charging issue

NO.

Description

Reason

Solution

Cannot charge

Adapter fail

Change adapter

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

：

USB port issue

NO. Description

Reason

Solution

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 connector

Battery connector

FPC

Содержание Q4202

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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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