Here is setup:

DJI S900 GH4 camera/ Zenmus Z15-HD Gimbal/ Mark 2 IOSD and AVL58 wireless tranmiter.

I have current Gimbal firmware and the IOSD is current.


My vertical sync is out.


When I switch the gimbal from AV to HD I lose video signal but the IOSD vertical display syncs up.I also tried disconecting the video out from the GCU and vertical sync was fine displaying IOSD only with no video.

I have reviewed some Threads from 2014, what is solution?
see link:


Borrowed GCU from  a friend:
Problem gone!

Hi, could you please try changing the gimbal's 9pin-10pin cable and wait for 2-3 minutes after power on? If still doesn't help, please send back the GCU for test and repair

Dji support 8 Posted at 2015-6-23 15:13
Hi, could you please try changing the gimbal's 9pin-10pin cable and wait for 2-3 minutes after power ...

I exchanged 9-10 cable and waited for 5 minutes. Vertical sync problem improved, but still exist. I tried my friends GCU with the exchanged cable and vertical sync was perfect. I would like to send in for repair.
Please provide instruction .


Thank you

litamation.yaho Posted at 2015-6-24 00:32
I exchanged 9-10 cable and waited for 5 minutes. Vertical sync problem improved, but still exist.  ...

You can contact the nearest DJI LA Office                 +1 (818) 235 0789
us.support@dji.com        Mon-Fri 9:00 am - 5:00 pm (PST)

Dji support 8 Posted at 2015-6-24 15:01
You can contact the nearest DJI LA Office                 +1 (818) 235 0789
        Mon-Fri 9:00 am - 5:00 pm (PST)

Thank you very much, I will call.

litamation.yaho Posted at 2015-6-24 22:25
Thank you very much, I will call.

My pleasure.