Author Topic: Help with PSOne LCD to RGB Mod (Read 7344 times)

SirPeale · « **on:** May 31, 2009, 05:19:53 pm »

I'm trying to hack a PSOne LCD to take RGB from an arcade board so I can use it as a test bench.

Most of the info has been straight forward...the R, G and B pins on the connector are obvious. And the grounds need to be looped together, as each color has it's own ground (or so I've read) (and yes, I know a ground is a ground is a ground).

The confusing thing is the sync signal. I know it's expecting CSYNC, will this work straight from an arcade board (std res, of course) or do I need to rig something up?

Kevin Mullins · « **Reply #1 on:** May 31, 2009, 05:46:30 pm »

My understanding is it'll hook straight up..... CSYNC being Composite Sync.
I know other people have used the same LCD screen for test rigs like this before because of the simplicity of it.

SirPeale · « **Reply #2 on:** May 31, 2009, 07:33:24 pm »

Thanks.

Your PDF would be great if downloading attachments currently worked!

Kevin Mullins · « **Reply #3 on:** May 31, 2009, 09:25:05 pm »

Quote from: SirPeale on May 31, 2009, 07:33:24 pm

Your PDF would be great if downloading attachments currently worked!

What?!?!

I thought that got straightened out already.

It was anything special anyways, just a bunch of letters and words and colors and stuff.

Kevin Mullins · « **Reply #4 on:** May 31, 2009, 09:28:42 pm »

Found it elsewhere for ya.

http://members.iinet.net.au/~paulhng/serio/PSOneLCD.pdf

SirPeale · « **Reply #5 on:** June 01, 2009, 01:10:17 pm »

Something's not right...all I can get is a white screen. Sometimes with lines, sometimes not.

Doesn't matter what source I have it hooked up to.

Kevin Mullins · « **Reply #6 on:** June 01, 2009, 02:47:16 pm »

I just asked one of local guys that I KNOW has used one on his test rig........ will see if he has any other advice.
I was thinking someone else on here had used one before too, but I haven't looked around very hard.

SirPeale · « **Reply #7 on:** June 01, 2009, 05:24:48 pm »

Thanks, I appreciate it. I'm scratching my head on this one. AFAIK I have everything hooked up correctly, it's not that hard!

qrz · « **Reply #8 on:** June 01, 2009, 10:14:28 pm »

IF i'm reading this correctly, and ur using a vga type input .
it would seem that hooking the game under test's composite sync output to the appropriate sync pin(s) on the connector would suffice ....

qrz

Witchboard · « **Reply #9 on:** June 01, 2009, 11:59:52 pm »

I don't think I ran composite sync. I can't remebmer it's been so long and my board I mounted in a project box to keep it clean. I'll crack it open tomorrow and see if I can verify what I did.

SirPeale · « **Reply #10 on:** June 02, 2009, 06:58:03 am »

Nope, I'm using RGB input from an arcade board.

Unless this is defective out of the box, AFAIK I've hooked everything up correctly!

hatrick · « **Reply #11 on:** June 03, 2009, 04:11:50 pm »

I've got one at home that I have sucessfully tested on a standard rez pcb. If I remember, I'll look at it tonight. I don't think i did anything special to get it to work.

hatrick · « **Reply #12 on:** June 03, 2009, 04:17:03 pm »

http://www.bit-tech.net/modding/2004/07/07/psone_lcd/2

I wired mine exactly as this website above shows. Just one ground wire. I wired mine to a 10 pin header, like you would find on a typical monitor PCB, with heat shrink tubing around all of the solder joints.

SirPeale · « **Reply #13 on:** June 03, 2009, 09:03:55 pm »

Quote from: hatrick on June 03, 2009, 04:17:03 pm

http://www.bit-tech.net/modding/2004/07/07/psone_lcd/2

I wired mine exactly as this website above shows. Just one ground wire. I wired mine to a 10 pin header, like you would find on a typical monitor PCB, with heat shrink tubing around all of the solder joints.

Bah...I've done exactly that.

I'm thinking it may be bad out of the box. I've triple checked my soldering and nothing's bridged. Still get nothing other than a white screen.

Witchboard · « **Reply #14 on:** June 03, 2009, 10:06:07 pm »

That is the same page I referenced for mine as well. Seemed pretty straight forward.

hatrick · « **Reply #15 on:** June 04, 2009, 03:42:32 pm »

Bummer. Does it work with any other sort of input? I think if you don't have a PSOne to test it with, you can use a camcorder style input that has video and audio on the same plug.

Also, are you sure it's the US version? I think I read somewhere that the Non-US version needs an additional 5volt input or something like that to work. Did you try the brightness control?

SirPeale · « **Reply #16 on:** June 04, 2009, 08:58:25 pm »

Well, I bought it @ K-Mart in the US. And yes, I hooked up the 5VDC line that turns the unit on. That's what makes it come on white.

I don't have a PSOne.

I might be able to scare up something I can use to input composite with. Maybe. I'll check around.

SirPeale · « **Reply #17 on:** June 06, 2009, 09:04:07 pm »

So I plugged the unit into my DVD player to get a composite signal in. Same white screen.

Thinking that I got the wires backwards on the back of the DVD player I swapped them. Same thing.

Luckily I have another LCD unit, so this time I plugged it in without hacking it. It fired up, I could read the onscreen display. I could not get any video to display, no matter what I did.

For kicks I hooked the original one back up, and for a few seconds I got the onscreen display. Then it went back to the white screen.

SirPeale · « **Reply #18 on:** June 06, 2009, 10:06:23 pm »

I've been using a straight connection from my wall wart to the DCC line to get this to fire up. This time I tried using +5VDC from the 7805 onboard using this trick:

http://www.forums.benheck.com/viewtopic.php?t=469&start=17

Now I can get it to fire up each time, but it won't display anything, even with the AV in jack. I do have onscreen display, which is good, but I can't figure out why it won't display anything else.

polaris · « **Reply #19 on:** June 06, 2009, 10:16:30 pm »

dont know if this makes sense,
the signal that is being sent to the screen, have you booted it with the screen on or, with the screen off then turning the screen on whilst receiving a signal.
what im suggesting is does it matter to the display when it receives the initial input signal?

SirPeale · « **Reply #20 on:** June 06, 2009, 10:58:10 pm »

Quote from: polaris on June 06, 2009, 10:16:30 pm

dont know if this makes sense,
the signal that is being sent to the screen, have you booted it with the screen on or, with the screen off then turning the screen on whilst receiving a signal.
what im suggesting is does it matter to the display when it receives the initial input signal?

It does not.

I'm thinking I'm using the wrong composite cable into the unit. I checked out the pinout and don't think the cable I have works. Weird, because I was sure I'd used it before.

I'm not even getting audio.

Tomorrow's another day.

SirPeale · « **Reply #21 on:** June 07, 2009, 08:34:29 am »

I was right - the cable I used must not have the right pinout. Weird that I wouldn't get ANYTHING, though.

RGB works fine now! Along with whatever problems I was having before I had the sync signal on the wrong pin.

First shot is my test bench PCB Tetris that I use to troubleshoot standard res monitors.

The second was the reason I set this up to begin with: a Galaxian board that doesn't have a sync signal. I was having to take it into my kids room every time I wanted to test it (there's a converted Galaxian in there with the original harness intact).

hatrick · « **Reply #22 on:** June 08, 2009, 12:52:08 pm »

I'm glad you got it all sorted out. These screens come in VERY handy for testing boards because they are so easy to cary around.

SirPeale · « **Reply #23 on:** June 08, 2009, 01:04:08 pm »

I don't know how/what I screwed up the first time around, but everything seems golden now.

My next challenge is to make a standard harness that you can plug right into. I've got one on there now - kinda. The goal is to have it completely enclosed in the shell. I saw one guys example, but there was no show on how he oriented everything in there. I may just remove that PCB since I'm not using it for a PSOne and solder directly to the wires. That would free up a lot of space. Not sure how I'd mount the header though. No solder points to adhere to.


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