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Help with Interference on RGB osd mux Lg 20” cp-20b85
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m.andrade1
Hello Guys
With the help of a very good friend Mark from Australia, i was able to mod a Lg 20” cp-20b85 Rgb osd mux the chassi is MC-83a, the process was perfect except with a noise with a "S" dancing pattern that is occuring specialy with solid background, below is the album with the instalation and examples with that interference.
Will try to describe the walkthru that Mark and i did on this chassi:
a) This mod was intend to run with a pc with an ATI-5450 (patched with 15khz) and CRt_Emudriver 2.0 beta 10 on windows 7
b) took of the RF modulator to avoid any future interference, and on that spot solder GNG (pin 10) from vga
c) Used the 5v from RF to feed R50 to trigger the FB
d) Sync did the twist on pins 13 and 14 with 1k in each them twisted togheter and run it on AV central pin
e) bring colours from VGA direct in a 75ohms already exist spot in chassi near rgb resistor (220ohs) on chassi.
To try to show Mark the interference with a very good way not only as a "ghost" on background i put a pot 10k on 5v source, and when you turn it almost to make trigger disappear or oposite almost to trriger on, the real "S" dancing interference pattern show all in it´s glory.
Album with instalation: https://photos.app.goo.gl/Qkxyc2ptez2guZxH7
So if anyone have some idea or a clue that we can do to try to minime or solve that interference will be extreme glad!
OBS: I even try to put some ceramic caps (pf ones) that was supposed to be in chassi but was not, to try to minimize the interference, but unfortunely did nothing, image stays with same interference.
Thanks a lot
Marcos
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