Making the RGB signal stronger? - Page 9

Camay123 · 03-06-2004, 10:04 PM

I got a NTSC Sony made Psone LCD Screen, since I cannot see any of the picture of this thread, I resume the procedure to this, do I miss anything ? Am I right ?

Quote:

Really all you guys are going to need for this mod is this LCD screen and a 270r resister
And an old VGA cable

I took the RGB from pins 1,2,3 on the VGA card and connected them to RGB pins 9,11,12 on the LCD

Then I took the H sync and V sync pins 13,14 on VGA and joined them together and then connected them to pic 6 on the LCD

Obviously I connected ground to pin one

And last but not lest I connected a resister to the red input then I connected the V and H sync to the resister.

Set the card to run at 15hz and that was it

Can i Use this cable as my vga cable ? If im right the needed wire are already there.

MM007 · 04-05-2004, 09:50 PM

Okay, I am a portablizer/pc guy, and am VERY interested in this. ^^ I have numerous video cards, PCI and AGP, as well as an InterAct 5" PSOne LCD with both AV and Multiout(the AV is actual AK jacks, not mini), and I need to know a few things.

I Googled for that version and build of PowerStrip, only to find a dead link. Does anyone know where can I download PowerStrip?

Also, there seems to have been some trouble with the success of this mod, and some conflicting methods, esp. in which resistor values to use and where to hook up the syncs to(which color).

I wonder if I can hook sync up to several of the RGB lines if I use diodes(I'm not sure, but it sounds like it boosts quality or something).

I would like to ask for confirmation on the correctness of the schematic on page four of this thread, as it seems to have only had a marginal success rate with people.

I also wonder if it is possible to split the sync back into horizontal and vertical sync. It would be cool to use the reverse of this method to make a universal VGA box for my systems and run portable systems off of old laptop screens. ^^

gork · 04-05-2004, 10:12 PM

For what it's worth, I have one of those ArcadeVGA cards from Ultimarc for use on my MAME Cabinet and it works great. It outputs everything at 15kHz horizontal refresh and uses interlacing and a redesigned textmode font to make things easier to see on low resolution monitors. It should work great for those of you doing this modification, though it's not exactly the cheapest solution out there...

You can also get a split-out VGA cable from Ultimarc for a few bucks.

azcowboy · 04-06-2004, 01:57 AM

Quote: Originally Posted by M pro

Ok here is the layout I used to get my LCD to work

As you can see the parts cost pennies and the layout is quite simple

Then after you make the cable install the latest version of Powerstrip. "I have PowerStrip 3.30 Build 366"

Load up Powerstrip and go to Display Profiles/Configure

then from there go to Advanced Timing options

From here click on custom resolutions

Now scroll down to you get to 640x480i (Arcade) and select it
Now this will tell you if your card will work with this setting.

If you look as setting you can see interlaced ticked, if your card has this grayed out then your out of luck and can’t do this.

But if it’s ticked after you click on 640x480i (Arcade) your good to go!
Click on add new resolution

now if all gone well your main monitor will go off as the sync will be to low for an ordinary monitor. If this is the case swap to your LCD ASAP! As you only get 10 secs to do this or your have to add the resolution again.

Then after you have your LCD hooked up you can adjust the position, but keep an eye on the pixel clock at the top and keep it at roughly 13.678 to 14mhz and you should be fine

that’s what I did to get my LCD working.

I have tested it with 3 TNT cards a geforce 2mx and a Geforce 4 TI and a Matrox Mystique and all work

what I couldn’t get to work was any voodoo cards from voodoo3 to 5

I tell you its amazing how hard it is to get a good pic of an LCD

First off I know this is an old thread but I didn't dig it up from the grave. LOL

Second, Nice going M-pro. It seems you did what no one else on this board was able to do or was willing to share with everyone else.

Third. You shouldn't need anything additional to get this to work. Could the problem be with the way you wired your connector. I just found a site that gave instructions for this mod without the resistor but wired the VGA connector a little differently.

Here are the pin assingments it shows for the VGA Connector.

1) Red
2) Green
3) Blue
6,7,8) RGB Ground
9) DCC(Optional) Whatever that is
13)Hsynv/Vsync

As I mentioned there is no resistor or anything extra added except the VGA Connector and wiring for it. This might also be why people with other PSOne LCDs from other manufacturers couldn't get theirs to work right with this mod.

Here is the website for more info

http://www.kickassamd.com/modules/mo....php?storyid=1

port20 · 04-06-2004, 02:00 AM

try svideo.com for a rgb amp

azcowboy · 04-06-2004, 02:17 AM

BTW. Has anyone tried connecting a touchscreen to one of these monitors. I haven't seen a touchscreen system for a screen 5 inches. Only 5.4 inches

MatrixPC · 04-06-2004, 09:38 AM

You can build a TTL-Sync circuit for the mod. All it need is 5 components (74LS86 or 74HCT86, 2 2.2K Resistor, and 2 22uF 10V electrolytic Capacitor).

This Link under TTL level sync signal show you how.

Or you can look at my Express PCB drawing.

cafn8 · 04-06-2004, 09:56 AM

Quote: Originally Posted by MatrixPC

You can build a TTL-Sync circuit for the mod. All it need is 5 components (74LS86 or 74HCT86, 2 2.2K Resistor, and 2 22uF 10V electrolytic Capacitor).

This Link under TTL level sync signal show you how.

Or you can look at my Express PCB drawing.

Pardon my ignorance, but what does a TTL-Sync circuit do?

Chris Poe · 04-06-2004, 10:40 AM

Is the pinout the same for all PS1 LCDs?

I never seen the LCDs before, so I dont know how they hook up to the PS, according to the posts, i m assuming through a 12-pin connector? Or does it hook it through RCA cable? I just want to make sure if I get a PS1 screen, that it will have that connector.

thanks for the help.

MatrixPC · 04-06-2004, 10:58 AM

Quote: Originally Posted by cafn8

Pardon my ignorance, but what does a TTL-Sync circuit do?

Convert Hsync and VSync to CSync. PSOne screen needs CSync to work.
This method is better than Sync on Green trick (the 270ohm Reistor) IMHO.

Use this circuit if the video card CAN NOT output CSYNC.

Quote: Originally Posted by Chris Poe

Is the pinout the same for all PS1 LCDs?

I never seen the LCDs before, so I dont know how they hook up to the PS, according to the posts, i m assuming through a 12-pin connector? Or does it hook it through RCA cable? I just want to make sure if I get a PS1 screen, that it will have that connector.

I am not sure about the Interact brand PSOne screen, but Sony screen are the same. The connection is hookup thru 12pins connectors on the bottom PCB.

MM007 · 04-06-2004, 11:08 AM

Well, I can see how this may work, but I am wondering: Do I still set the monitor software up the same way?

Also, I want to make VGA boxes for my game systems. Can the opposite of this circuit, RGB to VGA, be designed? It would require the splitting of horizontal and vertical sync, I believe.

Edit: I found out how to split the signal, but I still need to find a way to boost horizontai sync from 15KHz to 31KHz. Is there a circuit for this?

Edit again: Okay, I now know that what I need is a scan doubler. Any schematics out there for it?

I found this: http://212.57.231.17/datasheetarchiv...ic/DS49202.pdf
does anyone have anymore data on this(like cost), and can anyone make sense of the inputs and outputs? It is kind of confusing the terms they use. I must find a scan doubler....this AL251 seems to be the best option I've found. http://www.averlogic.com/video_converter/AL251.html is the site for it.

Edit #5: I think this is a complete NTSC to PAL circuit chip, but I really just need a scan doubler. If there is a schematic anyone can find please tell me about that, too.

MM007 · 04-07-2004, 12:47 PM

Sorry about the dbl post, but I guess the only way this may be noticed is an increase in the # of posts, and not another edit. Anyway, in addition to the questions and stuff above, I managed to get one of my video cards down from 29Khz HSync to 17KHz Hsync. Is this enough for the RGB mod? I ask because it is close to 15KHz, but not quite. It is on 640x480 Arcade setting.

MatrixPC · 04-07-2004, 01:08 PM

Quote: Originally Posted by MM007

Sorry about the dbl post, but I guess the only way this may be noticed is an increase in the # of posts, and not another edit. Anyway, in addition to the questions and stuff above, I managed to get one of my video cards down from 29Khz HSync to 17KHz Hsync. Is this enough for the RGB mod? I ask because it is close to 15KHz, but not quite. It is on 640x480 Arcade setting.

Download PowerStrip and try if the videocard alow you to pick custom resolution 640x480 Arcade
If it does, you are ready to mod.

MM007 · 04-07-2004, 03:20 PM

It did. That's how I got the HSync down to 17KHz. Before, it WOULD go to 640x480 arcade, but was stuck on 29KHz HSync. I guess it'll work then. Now I just need a Playstation Multiout plug....

Next up, I was looking through my stuff, and found an old 8-bit ISA card from 1991 that converts VGA to NTSC while allowing VGA output to still work. It seems to work with SVGA(the passthrough to the VGA port), but the software for it is so old, I dunno if I can get it to work on modern systems. It is so old, not only did it come with a 5.25" floppy as well as a Single Density 3.5" version, but the thing isn't even surface mount.

It only has 3 chips in it. The HD440072 1L 13(a MOS/CMOS-type is my guess, it has 28 pins), a MC1377P QHXB9004, which is a 20 pin, and a 74HC04N, which I am having trouble remembering what it is. It may either be a quad AND, a quad NAND, or a quad inverter IC. I lean toward the latter two for some reason. Other than that, I see four 3904 transistors, some resistors, some electrolytic, ceramic, and mica(?) capacitors, a pair of jumpers, and a single two-pin clock crystal labeled "BOMAR". Another interesting thing: the ISA connector only has 5 connections on it.

If anyone wants the software to look at, be my guest. Tell me where to send it. It seems to be DOS-based. I tried using PowerStrip to do something with it, but it didn't work.

If anyone wants to hack it(all the files, only 316KB total, though most aren't even VGA to NTSC files. It all fits on a single density 3.5"), be my guest. Most of the files seem to be supplemental, and the VGA to NTSC file is only 32KB. It has multiple settings for which video cards to work with(all from the old days), so it may be possible to determine the overall changes made in each case, and make a plan to reach the end result on a computer of today, esp. with the standardization of Plug N Play. ^^

If anyone is willing to take a look and help figure out what needs done, please tell me, ok?

danon · 04-07-2004, 11:16 PM

Quote: Originally Posted by azcowboy

BTW. Has anyone tried connecting a touchscreen to one of these monitors. I haven't seen a touchscreen system for a screen 5 inches. Only 5.4 inches

5", 5.1" and 5.4" are all the same, it is because the actual size of the screen is 5.6" but viewable at 5" or 5.1" depends on who is reffering it to. manufacturers started refering to the size of the monitor based on the actual viewable size some years back for fear of having to spend millions to change the product packaging when one buyer complained.

having said that, it is better to check the exact size (height/width) of the screen itself from its specs. since you can use a touchscreen bigger that the screen itself, but not vise versa.

danon