So , I have this screen :

LINK
I want to plug a component wire in the board but I don't find where I must solder my wire , I test on the RGB pin but no result.
The screen Work fine but in composite , and I want a best result with YUV , and I know I can plug VGA in this screen cause joytech sell this thing for the screen:

LINK
On the rear of the screen there're 2 input one for the PS2 TV Tuner ( // port ) and the other for a PS2 AV

When I solder my composite wire in AV input from // port there's no signal to the screen while if i solder the composite wire on the AV input from PS2 port the signal is good.....
So I think the Tv tuner give a signal to the screen PCB to open VGA port or other , but how I can do to open this input withou the TV tuner ?
here the PCB :

On the two pic :
the yellow selection is for PS2 AV input (9 / 6 / 7 )
and blue selection are for TV tuner input ( 8 / 1 / 2 / 3 / 4 / 5 )
thank for the futur answer , and sorry for my english