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FB5 point out as picture：
1.2：Auto power off problem：
Fault description: When use the power supply, the receiver will auto power off.
Detection Method&Solution:
（1）Detect the serial FPC flexible PCB. Separate the receiver to check the band
correctly install or not.
If not, please re-install the FPC flexible PCB.
（2）Detect the battery voltage. The battery should be 6.9V to 8.3V.
If not, please replace the battery.
（3）Detect mainboard parts to check there is any insufficient solder caused short
circuit.
If so, please replace the mainboard.
（4）Core board faults caused program error.
If so, please replace the mainboard.
（5）
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