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I recently bought Beambox R-1 (pico projector) and i tried to set it up with Dingoo, as R-1 cannot smoothly play almost any video file.
I bought myself a 3,5mm jack to jack (4-pin) cable and i sat in my armchair ready to go

How suprised i was, when it turned out that after connecting dingoo and enabling tv-out (connect TV option from menu) all i could hear was squeek and no video on projector...
Surprise was even bigger, when i tried disconnecting the set and .... the video showed on the projector - it seems like the A/V socket is not correctly designed and it works but you have to pull out a plug a little bit - how strange is that?
Maybe i`m missing something or there is some remedy to this friggin socket?