[FIXED] Problem with RGB on a Sharp LCD screen (IR3Y26A)

If you're making a portable you probably need something to watch it on. (Unless you want to guess what's happening in the game, but I wouldn't advise that) Anyway, this forum is your "Hacking a pocket TV/screen" one-stop solution. Share your experiences and knowledge here.

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DjBeatbox
Posts: 2
Joined: Fri Nov 21, 2008 3:46 pm
Location: France

[FIXED] Problem with RGB on a Sharp LCD screen (IR3Y26A)

Post by DjBeatbox »

Hi every one !

Like almost on this forum I want creat my own portable SNES.
So I have bought a 7" lcd screen which have a Sharp LCD screen and 2 video input (composite signal).
As I don't like not a all this kind of signal, I would like to put in the RGB signal of my PAL SNES.
I can see on the CI of the screen, near the IR3Y26A video controler, 3 pins labelled : R, G, B and a 4th : Sync.

So I have thought that I could solder on it directly the corresponding signal of the SNES. Like this :
Image
Image
Pay attention only on the three color and the ground, the other wires have no importance.

Image
Image

But doing this, we have only this result on the lcd screen :
Image
We can see the color are OK (white text on blue screen) but there is a problem with the vertical sync.

So according the GameSx on the PAL SNES there is no CSync on Pin 3 like NTSC model, so I had built this little circuit to have one :
Image
But it doesn't happen anything any more.
The screen become anormally red and seems going to explode ! (I have already destroyed one testing a too long time sync on the Sync pin)


Through this forum I could see that segasonicfan had managed to hack a IR3Y31M chroma encoder which is nearly the same of mine (the IR3Y26A).
So what can I do to have a perfect image on my screen ?
Have I to proceed differently ?
Connecting the R G B on different pin on the IR3Y26A ? The Csync any where too ? using capacitor between SNES RGB pinout and the IR3Y26A (like 104µF)

Please help me ! I have already break a screen, I don't want to make an other mistake...

Thanks you all !
Last edited by DjBeatbox on Sun Nov 23, 2008 1:06 pm, edited 2 times in total.
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ShockSlayer
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Post by ShockSlayer »

Search the internet for the chips on the board...and then post us some datasheet links! :P I cant interpret them, but I'm sure others can! Also, I would try PMing segasonicfan(the one you mentioned) for more info.

SS
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DjBeatbox
Posts: 2
Joined: Fri Nov 21, 2008 3:46 pm
Location: France

Post by DjBeatbox »

Thank you for your answer ShockSlayer.
Actually, I have already post in an url the IR326A's datasheet at the begining of my first post.
I can see on the IC of the screen, near the IR3Y26A video controler, 3 pins labelled : R, G, B and a 4th : Sync.
http://www.telemaster.ru/minitv/pdf/IR3Y26A.pdf

And like you have mentionned i'm going to PM segasonicfan who have managed to hack his PS2 screen portable.

Thank you again.

EDIT :
Well done !
It's finally working !!
I have just used the IC of the scart of the snes before connecting the signal to the lcd screen and now the image is perfect !
A little soucy however : the screen become red when there is no signal inside... is it normal ?
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