Hey X5F,
I’ve sorted mine out after even swapping heads that didn’t work.
The issue was in the boot there’s a blue connector from the T.V module to the sat nav head unit, if you disconnect this connector you might find black sticky stuff which has come off the electrical tape over hot summer years and ran into the connector!
I sprayed some WD Electrical cleaner in mine, put it all back and no flickering.
I hope it’s the same fix for you ����
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