LAZER MW6617 Service Manual - page 13
Troubleshooting
1) NO POWER ON:
⑴Check the VDD,VDD_LOG,VDD_ARM voltage;
⑵ Upgraded the software;
⑶ checked the MTK8382 & DDR3 solder.
After inserting the battery, VRTC output voltage of 2V, and then the 32.768 KHz crystal start to work. Now
press the power on/off switch , PMU will working , then the BB inner program start initialing. Press the
power on/off switch about 2s at normal work status, CPU will detect the signal and you will see the power
off item. If not you can check U402, maybe damaged.
2)LCD no Display
1)Check the LCD FPC is in contact normal
2)Replace LCD
3)
No touch:
1)Check whether the contact normal TP FPC
2)Check whether the welding good J15 and GSL1680
3)Replace ICGSL1680 and TP
4)
WIFI,GPS,FM,BT not work:
1) Changed the WIFI antenna;
2)
This is wifi/BT/GPS RF circuit.ANT_OUT connect to MT6628Q IC.
(U7,MTK6617).