VIDEO DAC BRIGHTNESS ISSUE

[PaulJ]

One has to do what one has to do... :mrgreen:

[exxos]

Can someone do a neat version for the fixes page ? :lol:

[PhilC]

Can someone do a neat version for the fixes page ? :lol:

That'll be me out then, @PaulJ maybe?

[PaulJ]

@PhilC , most likely give it a try later today. If it turns out I'll put up a picture. :D

[Icky]

I've been a bit lazy and did the @Icky method and skipped the cap.

@PhilC - I may put in the cap later today and take a better pic to show the patch.

[PhilC]

@Icky ok cool but so far I dont think its needed. Be interesting to see a before and after shot

[PaulJ]

Ahh.. put the change in but still needs work. :foldarms: :foldarms: Its about 85% improved but the quality isn't what it could be. The white is a little muddy, some vertical interference I don't like. The black is still a little muted. Maybe I'll try a pot later today if I can find one that's useable. The divider is setting at 2.2 volts as it sets. Its hard to take a pic of the fix. The three raised pins are well above the other connections, there are no shorts.

IMG_1198.jpg

FixCol1.jpg

[exxos]

Try adding a cap on the divider... The voltage should be 1.6V really as well.

@PhilC image seems ok though ? https://www.exxosforum.co.uk/forum/viewt ... =10#p30437

[Icky]

Try adding a cap on the divider... The voltage should be 1.6V really as well.

@PhilC image seems ok though ? https://www.exxosforum.co.uk/forum/viewt ... =10#p30437

I think @PhilC is using VGA. I am using RGB TV and I think it is a little darker than the original STFM. Will also tweak the divider to see if I can get it to match an original. Have put the cap in but did not see much difference.

I still have to try it on that TV that was whiteout. Will do that now.

[Icky]

So something still is not quite right with the video circuit. The TV is still on whiteout where as plugging in an original STFM into it its ok, see pics of both below:

IMG_4649.jpeg

IMG_4650.jpeg