LAZER MW6617, Руководство по обслуживанию, Страница: 13 / 21

Troubleshooting
1
）
NO POWER ON:
⑴
Check 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).