A way to check to see if the sync is riding on the green is simple.  If you
disconnect a color such as green or blue, the display changes color.  If you
disconnect the green and the sync is riding on it (always the case on RGB
signals I've worked on), the entire display will disappear.  You might want
to verify that the impedance is 75ohms or a high input impedance also.
Regards,
Mike
----- Original Message -----
From: "T.C. Phelps" <tcphelps@YAHOO.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, July 31, 2001 7:36 AM
Subject: [EE]: Colour LCD screen


> Hi everyone,
>
> I was given a small 3" (or so) colour display similar
> to the ones in those handheld TVs. The problem is, all
> the docs I was given are in Japanese! I've spent a lot
> of time searching the net and have a vague idea of how
> it works, but if anyone knows of any good references
> on RGB inputs for LCD screens, voltage levels, timing
> diagrams, anything really, I'd appreciate it.
>
> Here's what I know about the screen:
>
> The display has 9 inputs:
>
> 1 through 3: 10 - 20K variable resistor
> 4: Sync
> 5: Blue
> 6: Red
> 7: Green
> 8: +5 V
> 9: GND
>
> The RGB inputs run off a Sony V7021 NTSC/PAL to RGB
> decoder. I'd like to try running this display via a
> PIC and perhaps a D/A converter (the RGB values appear
> to be analog). Can anyone help? I can't find any info
> on the RGB format or on "Sync" -- I thought there were
> supposed to be two "Sync"s!!
>
> Thanks,
> Todd.
>
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