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additionally screen is in negative
The first move - check/replace D11 (since it "prepares" both Inv and Sync sygnals)

Following foto show case when D42.9 is connected directly to base of VT3(VT2&R2 removed)
D42.9? or D42.8?

16 pin of SCART is connected to the ground in this model
This TV may have no RGB inputs on SCART (not sure).