MV-1F contrast/colors problem

Joined
Jul 14, 2020
Posts
9
Hello!

I have a strange thing on my MV-1F slot.
The colors seem to be darker almost absent in certain scenes of games (almost during use of "zoom" hardware capabilities).
In AOF2, all is OK in fixes scenes.
The problem start during demo/game mode.

All is OK with hardware debug BIOS.

The board has been repaired by myself (All the DAC stage, LS273, LS245, LS05).
Resistors OK.

:crying:


A video:

http://theangel540.free.fr/WP_20200716_004.mp4


Photo of the DAC stage:
http://theangel540.free.fr/WP_20200716_005.jpg

(LS05 changed ... All the same problem with cmos or ttl ics ... HC or LS)


Thk a lot for your help!
 

shadowkn55

Genbu's Turtle Keeper
15 Year Member
Joined
Dec 9, 2006
Posts
2,386
Did you try using LS parts for the 273? The output voltage between LS and HC logic families are different.
 
Last edited:

shadowkn55

Genbu's Turtle Keeper
15 Year Member
Joined
Dec 9, 2006
Posts
2,386
If you have a unibios, try viewing the color bars and see if anything looks off.
 
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