Thread: Making the RGB signal stronger?

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. ^^

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.

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

try svideo.com for a rgb amp

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

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.

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?

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.

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.

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.