Video problem with 8245.

Por mau_rizio

Resident (48)

Imagen del mau_rizio

14-03-2015, 16:40

Hi all,
my 8245 connected to tv via scart has the white dispalyed as light blue, everything is ok with the rf.
Already tested with different scart cables and 3 different tv's.
What i can check?

tahnk you
mau

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Por marcoo

Expert (106)

Imagen del marcoo

14-03-2015, 17:12

I had that too the problem was the rgb From lcd tv sets
The problem is the voltage when the tv must select the rgb Channel
The output From the msx is 5 volt to switch to rgb the Some never tv sets uses the 3.3 volt so you Should solder a resistor to select the rgb it worked for me for the msx and amiga
On pin 8 of the scart 1Kohm and on pin 16 75 ohm

Por mau_rizio

Resident (48)

Imagen del mau_rizio

14-03-2015, 19:15

I will try this, and some older scart cable with older crt tv.
But i already tested with a ten years old crt tv.

Por mau_rizio

Resident (48)

Imagen del mau_rizio

15-03-2015, 17:02

I've soldered the resistors but nothing has changed.
If i disconnect the pin 16 the colors are ok but the picture quality is poor.

Por mau_rizio

Resident (48)

Imagen del mau_rizio

16-03-2015, 10:56

tested on an older crt:
If i use a standard scart cable i get the bluish white, if i use the modified one the image is not stable...
Perhapse the msx is sending wrong signals on scart pins? How i can check this?