You have a Caddx turtle V1/V2 and you can see only a yellow screen like this one:


The main reason is probably the cable between the camera and the board, it could be like:


So if any of this cable is damaged you can replace them by getting new one from caddx or banggood directly:

V1: https://caddxfpv.com/collections/cables/products/caddx-turtle-coaxial-cable or directly on Banggood
V2: https://caddxfpv.com/collections/cables/products/turtle-v2-coaxial-cable-5cm-and-10cm or directly on Banggood

It is also possible that your cable is ok so in this case it is probably more a problem in the board 🙁 So here some links to get some:

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