A290 L2 Service Manual
Contents
1. 2 Display issue No display S NO Possible Cause Validation steps Action Flash the handset with latest SW 1 No display LCD fail Change LCD PCBA fail Change PCBA LCD backlight is set j Reset the value of backlight too low by person cr oma nothing like anything A290 L2 Service Manual 3 Touch panel S NO Possible Cause Validation steps Action Flash the handset with latest SW Charge TP TP not working Assemble TP again PCBA issue Refer to L3 repair Charge TP 2 not working proper PCBA issue Refer to L3 repair cr oma nothing like anything A290 L2 Service Manual 4 Proximity Sensor S NO Possible Cause Validation steps Action Flash the handset with latest SW _ Sensor holder is not Proximity sensor fail Re assemble the sensor holder assembled well PCBA issue Change PCBA Sensor EE t0 K o0 croma nothing like anything A290 L2 Service Manual 5 G sensor S NO Possible Cause Validation steps Action Flash the handset with latest SW G sensor is not working Set problem PCBA issue Change PCBA 6 Keys S NO Possible Cause Validation steps Action The feeling of pressing Key is fail Change Keys FPC croma nothing like anything A290 L2 Service Manual 7 Charging S NO Possible Cause Validation steps Action Adapter is fail Change adapter Flash the handset with latest SW H a a T Change PCBA not charged Battery fail Change battery Change battery connecto2. A290 L2 Service Manual re i m Tag e 3 i 3 1 Technical Specifications Particular Remarks peower ee Network Mode WCDMA 900MHZ 2100 MHz a u ExpandabeMmemoy ee O O Oo S SO Good Mic volume 2 2kQ 5 Good Vibrator volume 300 5 cr oma nothing like anything A290 L2 Service Manual 2 CAUTIONS Flashing amp Servicing must be undertaken by qualified personnel only ll Ensure all work is carried out at an anti static workstation and that an anti static wrist strap is worn lll Use only approved Tools amp 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 3 Service Details Main Components Vibrator connector Camera connector TP connector Earphone SPK Battery RF line coaxial Connector connector croma nothing like anything A290 L2 Service Manual 1 Does not power on S NO Possible Cause Validation steps Action Battery capacity level is Battery capacity too low PCBA faulty Power key FPC croma nothing like anything A290 L2 Service Manual
3. CBA issue Refer to L3 repair croma nothing like anything A290 L2 Service Manual 19 Speaker S NO Possible Cause Validation steps Action 1 2 Audio PA issue Refer to L3 repair 20 GPS S NO Possible Cause Validation steps Action Flash the handset with latest SW GPS not connecting Change GPS antenna croma nothing like anything A290 L2 Service Manual 2 Batte ry S NO Possible Cause Validation steps Action 1 2 a let eae tee No charging charging cissue change PcBa Cannot charge fully Charging IC issue Change PCBA Change battery connector Battery connector Thanks For any Query or suggestion Please write to tech help micromaxinfo com cr oma nothing like anything
4. e PCBA WIFI chip aiene I m 2 oO Cra bow Er ee ee le b e a 2 a Se bh Thy a j TEN cromax nothing like anything A290 L2 Service Manual 14 RF Network S NO Possible Cause Validation steps Action RF antenna is fail Change RF antenna RF Net k t A TEA SIM socket is fail Change SIM socket searchable PCBA fail Change PCBA SIM connector Antenna te ete Pit a 7 y u 15 Bluetooth FM S NO Possible Cause Validation steps Action Flash the handset with latest SW PCBA fail Change PCBA Cannot turn on BT FM BT antenna fail 4 in 1 chip issue Change 4 in 1 chip 5 4 in chip croma nothing like anything A290 L2 Service Manual 16 Receiver S NO Possible Cause Validation steps Action Dust with receiver 1 Noise crack Change it Assemble it 2 Noise volume low Change it 17 Earphone S NO Possible Cause Validation steps Action Earphone not detecting Change earphone connector Not working from earphone Earphone connector Change earphone connector having poor soldering Earphone connector croma nothing like anything A290 L2 Service Manual is MIC S NO Possible Cause Validation steps Action Some dust with mic 1 Noise with uplink side Change Main FPC PCBA issue Refer to L3 repair Change Main FPC 2 Volume low PCBA issue Refer to L3 repair Change Main FPC 3 No recording Re install SW P
5. r Battery connector TI a a y a E ee ee GS omar A290 L2 Service Manual s USB S NO Possible Cause Validation steps Action USB cable is fail Change USB cable Cannot connect to PC Main FPC fail Change Main FPC having I O connector PCBA fail Change PCBA V O connector croma nothing like anything A290 L2 Service Manual 9 Front Camera Possible Cause Validation steps Action Colored screen when open front camera PCBA fail Change PCBA Flash the handset with latest SW Cannot turn on front camera PCBA fail Change PCBA 10 Rear Camera Possible Cause Validation steps Action open front camera PCBA fail Change PCBA Flash the handset with latest SW Cannot turn on front i camera PCBA fail Change PCBA cromax nothing like anything A290 L2 Service Manual 11 Playing Video S NO Possible Cause Validation steps Action Flash the handset with latest SW Hang often CPU poor soldering Refer L3 Repair DDR poor soldering Refer L3 Repair croma nothing like anything A290 L2 Service Manual 12 Vibrator S NO Possible Cause Validation steps Action S Vibrate assemble issue 1 Vibrating is not properly Change it Soldering issue Re soldering it NO vibrate Change it PCBA issue Refer to L3 service Vibrate weakly Change it Vibrator Pads 13 WIFI S NO Possible Cause Validation steps Action o WiFlnotworking Stii turn off as defaut j 4 in 1 chip fail Chang
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