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Q452 L3 Service Manual

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Summary of Contents for Q452

Page 1: ...Q452 L3 Service Manual...

Page 2: ...brator volume 30 5 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...

Page 3: ...ual RF 2G PA U1200 Flash U401 CPU U400 BT WIFI GPS FM U1300 Receiver Connector SC4 SC5 Main camera connector J1501 P Sensor U1703 XTAL Y801 Power IC U601 USB Connector J1804 3 4G PA Backlight driver U...

Page 4: ...if fail in the Proceed of downloading Use a fresh data cable Earphone Connector J1601 Switch charge IC U1802 Audio PA U1600 LCD Connector J800 Front Camera connector J1500 TP connector J1402 SIM conn...

Page 5: ...Check the I O connector soldering quality if not Re sold it or change it Check the CPU work normally or not Re Solder the CPU or change it USB Connector CPU Flash...

Page 6: ...rrent will be from 100 ma jump to light screen Enter boot LOGO 400 ma to completely started around 500 ma if the current not right then check Whether has short circuit or open circuit phenomenon or no...

Page 7: ...voltage of battery when charging If it reaches 4 2V has shown in front of the Transmission now maybe is the battery bad so that no charging Check the I O connector work well or not if not Re Solder o...

Page 8: ...I O connector Power IC Switch Charging IC switch IC...

Page 9: ...with latest SW Check the connect ribbon cable saddle normally or not Re assembly LCD Check the LCD connector work normally or not Re Solder LCD connector or change it Check the CPU work normally or n...

Page 10: ...t with latest SW Check the connect ribbon cable saddle normally or not Re assembly TP Check the TP connector work normally or not Re Solder TP connector or change it Check the CPU work normally or not...

Page 11: ...able saddle normally or not Re assembly LCD Check the LCD connector work normally or not Re Solder LCD connector or change it Check the Backlight IC work normally or not Re Solder Backlight IC or chan...

Page 12: ...he ground pin is low lower than grade if yes Replace the resistor of the corresponding pin Check if the series resistors on each network of the SIM card have pseudo soldering if yes Carry out repair s...

Page 13: ...cept the ground pin is low lower than grade if yes Replace the resistor of the corresponding pin Check if the series resistors on each network of the TF card have pseudo soldering if yes Carry out rep...

Page 14: ...the ground pin is low lower than grade if yes Replace the resistor of the corresponding pin Check if the series resistors on each network of the Camera connector have pseudo soldering if yes Carry ou...

Page 15: ...ector except the ground pin is low lower than grade if yes Replace the resistor of the corresponding pin Check if the series resistors on each network of the Camera connector have pseudo soldering if...

Page 16: ...Camera connector PMU CPU...

Page 17: ...rted MIC Receiver will not work Check the MIC work normally or not Re Solder the MIC or change it Check the LCD FPC Assembly Quality if not Re Assembly it or change it Check the FPC connector solderin...

Page 18: ...12 Receiver not working Solution Flash the handset with latest SW Check the receiver bad or not then change it Check the receiver circuit normally or not...

Page 19: ...Speaker bad or not else change it Check Earphone connector also If Earphone connector got shorted MIC Receiver will not work Check the SPK FPC soldering quality if not Re sold it or change it Check th...

Page 20: ...SPK Slot FPC connector LCD SPK FPC Connector Power IC CPU...

Page 21: ...ly or not then change it Check the earphone connector normally or not then Re Solder earphone connector or change it Check the Power IC normally or not then Re Solder Power IC or change it Check the C...

Page 22: ...G SENSOR not working Solution Flash the handset with latest SW Check the g sensor work normally or not Re solder or change it Check the CPU work normally or not Re Solder CPU or change it CPU G Senso...

Page 23: ...hange it Check the first pin of earphone well connect with earphone line or not then Re Solder earphone connector or change it Check the Power IC normally or not then Re Solder Power IC or change it C...

Page 24: ...g fine Flash the handset with latest SW Check the WIFI antenna normally or not then Re Solder or change it Check the WIFI chip work normally or not then Re Solder CPU or change it Check the CPU normal...

Page 25: ...fine Flash the handset with latest SW Check the BT antenna normally or not then Re Solder or change it Check the BT chip work normally or not then Re Solder CPU or change it Check the CPU normally or...

Page 26: ...rking Solution Flash the handset with latest SW Check if the keys FPC normally or not Re Solder Side key or change it Check the circuit from keys to CPU normally or not then Re Solder CPU or change it...

Page 27: ...nge it Check the Main FPC Assembly Quality if not Re Assembly it or change it Check the FPC connector soldering Quality if not Re sold it or change it Check the power IC work normally or not Re Solder...

Page 28: ...with latest SW Check the Proximity sensor normally or not Re Solder Proximity sensor or change it Check the Power IC work normally or not Re Solder Power IC or change it Check the CPU work normally or...

Page 29: ...ine Flash the handset with latest SW Check the GPS antenna normally or not then Re Solder or change it Check the WIFI BT GPS FM IC normally or not then Re Solder CPU or change it Check the CPU normall...

Page 30: ...mbly it or change it Check the RF connector normally or not Re sold it or change it Strongly solder 26M Crystal or change it Check the RF PA normally or not then Re Solder RF PA or change it Check the...

Page 31: ...Thanks...

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