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So I took a gamble as I got a pretty good deal on a used 8-inch screen that arrived today. Plug and play, just like @pab567 said - but it looks like that wasn't the issue.. Any advice on the best next step to take?

Thanks varaderoguy. I contacted a local "infotainment specialist" someone recommended and sent them photos/video - their "MIB guy" also reckons it's the screen rather than the glovebox unit. Also rang the local Skoda dealer - they want £100 to diagnose and quoted ~£700 for 5E0919605J (same as my busted one). I asked about the M variant - they said I should get what was originally fitted and wouldn't comment on compatibility with M.. @pab567 you appear to be the expert on those around here - any advise? At this point I'm thinking of just getting a 2nd hand 5E0919605M and swapping it myself. My glovebox unit is 5Q0035874A (photos above) - am I right that this should be a simple plug-n-play job? Anything else I can check beforehand? Thanks.

Thanks both for the replies. @varaderoguy by "revision M", did you mean the 8-inch 5E0919605M screen? Looking at other topics on the forum it looks like my 5Q0035874A headunit might be plug-and-play compatible with that screen. I still have third party warranty with Autoguard, so planning to go to a garage to claim it through warranty - but I'm guessing they might be hesitant about part compatibility and end up with another 5E0919605J...

Hi there, I've seen a lot of posts about infotainment issues in this forum, but couldn't find one quite like mine, so starting a new thread. My 2016 Octavia Mk3 infotainment screen has recently started to occasionally flicker in red/purple/pink. Last weekend around midway of a 60-ish mile trip it started to progressively flicker more in more to the point of getting stuck in purple/pink and continuously restarting. I turned it off and completed the trip home. Decided to test it with ignition off and somehow it was fine. Fast forward 2 days of normal behaviour and no flickering - and it started doing it again. It has been getting progressively worse this week. I noticed it would get worse (flicker more often) in the evening when driving back from work (15-20min 95% motorway commute). In the mornings it was usually fine; maybe a few flickers. Don't know if the cold weather or the car being cold in general in the mornings was having some sort of a "positive" effect. This weekend it has gotten to the point where it stays in purple/pink monochrome 90% of the time with the occasional flicker to red and sometimes going back to normal for a few minutes. Everything works fine otherwise - touch, knobs, sound, nav, etc. I took both the screen and headunit off today in attempt to wiggle and push in all connections in case something had gotten loose. This does not appear to have an effect - the screen would flicker randomly, apparently unrelated to connector wiggle. I did notice it would flicker more when the screen refreshes - like when zooming in/out in navigation or cycling though the main menu. At this point it's just stuck in purple/pink. Any ideas whether this is the screen on it's way out, or maybe the headunit? Anything else I could check? Attaching photos of what I thought was relevant. Thanks!