Hi,
Does the screen work if you hold the cable in position in the connector?
If so try gluing it in position with a few small dobs of neutral cure silicone sealant between the cable and the systemboard. Make sure that it won’t move as you allow the sealant time to cure (read the curing time on the sealant tube) and then check if it holds and works after.
May be a cheaper fix than a replacement motherboard
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