[SOLVED] BLACK SCREEN on some LCD TV's with RGB MSX

Of course people would be interested, and a little suspense before the reveal is okay

I assume you have the French models of these computers because outside France these machines actually only had composite video. I only had a French YC-64 at some point but that actually gave a good image on my 4:3 (first generation) LCD TV but I know more modern 16:9 TVs cause more trouble. So if a small resistor can fix that, please share!

Hi
i would love to post pictures of my little hack but i don't know how to do it !
sorry i'm not really confortable the UI of the forum. i do not see any "upload picture" button.
anyway just as said gdx, i disconnected the 100 ohms resistor that provide the Y signal from the VDP to the commutation pin, and i tied this pin to the 5 volts pin with a 180 ohm resistor. the resistor dissipate 100 mW so a 1/4W resistor is enough
this hack provide the 1,5 volt signal required by the TV for detecting the RGB signal (my TV requires 1 to 3 volts).
best regards

Then it would be SCART pin 16 (Blanking) and NOT pin 8 as suggested by gdx.

Pentarou, i confirm that my hack concerns the pin 16 on scart
gdx, depends on the voltage you apply : i measured 66 ohms at the scart input (pin 16) of my LCD TV
(each video signal input should be internally terminated by a 75 ohms resistor inside the TV. that's standard.)
i need 1 to 3 volts for RGB detection
https://en.wikipedia.org/wiki/SCART
so i use the 5V supply i need a 180 ohm resistor, that gives 5 x 66/(180 + 66) = 1.34 V
if i choose 12V i will need a 470 ohm resistor, that gives 12 x 66/(470 + 66) = 1.47 V

i do not care of the aspect ratio because any modern TV allows me to stretch and crop the image

hope you will find that useful
best regards