phantom 2 vision plus 4 green lights red quick

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I seem to be having an issue. After a good compass calibration I get 4 slow green lights followed by a quick red series. What does this mean?
 
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I’m getting EXACTLY the same sequence. The four green flashes...then a quick burst of red flashes for 2 and bit second. Anyone else had the same or can explain what we’re seeing??

thanks
 
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On Ph3, this typically means Ambarella is restarting.

This can be checked by connecting to UART.
Oh, also - sometimes it's just because of SD-card, and removing the card makes Ambarella work.

Ambarella is a chip which controls both SD-card and the LED. It drives CMOS sensor, gets image data from it, and sends to SD-card, while also preparing lower quality video for FPV. That FPV video then goes to DaVinci which is compressing it for radio transmission.

EDIT: Somehow I assumed the question is about gimbal light. So the answer above is for that - if you see such sequence in gimbal LED, not arm LEDs.
 
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Update: I was getting those light sequences in my back yard and in the local park(West Ham Park, London). I tries in a larger park(Victoria Park, London)and even though an app I use showers a similar number of satellites available it now just flashes green! I guess there must have been some interference that isn’t there in a larger open area.

Off to Richmond Park fly zone Saturday morning!
 

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