HELP! Internal Screen not working!!

Hello,
I've a terrible problem with my Roadhog: right after having replaced the battery on the main board, the left internal screen doesn't work anymore.
It powers up and the initial "no signal" displays, the touchscreen is also responding.
I already checked all the connections and they are ok!

Can anyone help me? I've a show starting in 6 hours... :aargh4:
Thank you very much!!!!!!!!!!!!
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