Hacking a Sony Trinitron Monitor for RGB

[Jack Burton]

I've got an old Sony CVM-1900 here and I had a look inside it just for fun.  I can see connector with a set of five wires coming off the main board that lead up to the neckboard.  They are then connected to adjustment pots that are called:

B Drive
G Drive

B BKG
G BGK
R BGK


The wires are colored red, green, blue, black, and gray.  Are these the RGBHB signal wires?

Cause if so, I would really like to turn this into an RGB monitor.  Can't imagine it actually being that easy though. 

Can it?

[qrz]

crt tv drive circuitry is slightly different than monitor rgb.
along with the chroma signals is a luminance drive.
the luminace signal is applied to each gun simultaneously.
whereas the chroma is fed to the specific color gun.

set a dc bias for the lumi. which can be an aux brightness ctl .
and then feed rgb to the drive .

there may be other items required pending the  model..  watcha gots ?


qrz

[Jack Burton]

The model is a CVM-1900

Could you give me some more info regarding what you mean by setting a dc bias for the luminance?

My monitor has a switch that goes between 75 ohms and off.  This dramatically changes the brightness of the monitor.  Is this something like what you are talking about?

This is a pic of the monitor if that helps:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370038997665&ih=024&category=21517&ssPageName=STORE:PROMOBOX:ENDSOON

[qrz]

sry, u had the model # in orig post . it didn't register to this old fart .......

i don't recall to which consumer model this subs , so looking for a schematic.

the luminace signal is already a part of an rgb signal.

but in tv's, luminance and color are processed seperately and combined at the crt drive.

thus, crt drive circuitry varies per type.

more later..

qrz

[Ummon]

Dude, looking at the back, and not surprising given this monitor appears to be a studio unit, it is RGB. BNC4. (Apparently, it also has a tuner in it, used with the UHF and VHF inputs.)

[Jack Burton]

Dude, looking at the back, and not surprising given this monitor appears to be a studio unit, it is RGB. BNC4. (Apparently, it also has a tuner in it, used with the UHF and VHF inputs.)

Nope, it does not have RGB inputs.  What you are seeing are Line In inputs, which are essentially composite inputs.  I have even used BNC to phono adapters and played Gamecube games on this monitor. 

The other three BNC connectors on the back are video out connectors for the other functions of the set.