Mine does same, after couple crashes and two water dunks, I finally got a fpv setup but iOSD info was tx but no video. I traced the problem to the gimbal, no video was getting thru. A video signal applied at the ribbon cable from the gimbal would get transmitted. To solve the easiest and surest way, I purchased a mini-usb right angle video plug for approx. $5 and wired it to the video input of the iOSD mini and now works. The wires have to be carefully routed from the usb plug to the P2 to keep the gimbal from hanging up.