ps2 to vga, green screen

[rydz]

Hi,
I've made it from component cable to VGA (to plugin PS2 to the monitor) step by step as was shown on the page http://skygate.bravehost.com/PS2_VGA_cable.html
All works (I've tested Soul Calibur III f.e.), but all the screen is green :-/
Also with "screen fix" option turned on (in modbo 760) to VGA screen is still green (here is a link to foto: http://rydz.glt.pl/sog/SDC10205.JPG)
Is there any possibility to get rid of green color?
My console is PS 2 SCPH-30004 R, PAL version and the monitor is LG F700B.
In my project I've used capacitors 100nf, also lm1881m (smd) and resistor 680kOhm with 5% tolerance.
Construction takes +5V from USB port on PS2.

[RGB32E]

The green tint on your computer monitor is caused by having the sync information still contained on the green video signal.  Even though the LM1881 generated new H/Composite and V syncs, the compsite sync is still on green video.  One of my computer monitors will accept SoG, but I have to change the sync clamp mode (Mitsubishi DP900u) or else sync information is displayed (like the issue you are encountering).  So, look through the menus on your monitor to see if there are any sync settings (to avoid having to build a circuit to remove the sync on green video).

[s8n]

hiya rydz and RGB32E , try going into the PS2 BIOS and select RGB video output. It may be stuck on another video option.


s8n

[rydz]

@RGB32E: There are no options to synchronize my monitor, is there any way to get rid of that green color?
@s8n: I've set RGB in BIOS - the screen is still green.

[s8n]

change it to YPbPr video mode , and make sure you have the 220uf Caps on the RGB lines going the right way.  Aswell apparently if going the wrong way it will cause a Green screen.

http://digilander.libero.it/jackda/tutorials/ps2Vga_FINAL_DIAGRAM_NO_GREEN_SCREEN.jpg

http://members.optusnet.com.au/eviltim/gamescart/gamescart.htm#psx

also theres a Thread at PS2 scene about PS2 to VGA

http://psx-scene.com/forums/ps2-homebrew-dev-emu-scene/24593-new-ps2vga-diagram-work-with-games.html?highlight=ps2%20vga

[RGB32E]

@RGB32E: There are no options to synchronize my monitor, is there any way to get rid of that green color?

Perhaps filtering RGB with 220uf caps will fix the problem.  I can't say that that will necessarily fix the issue though.  For my setup (to DP900u), all I have to do is connect R, G, B and ground to my monitor and set the "Clamp Pulse Position" to back...  But the clamp setting is specific to some of the Diamond Pro CRT monitors...    if you don't want to build anything, pick up something like this: http://www.extron.com/product/product.aspx?id=rgb130xi&search=rgb%20130xi  All you'd need to do is wire the RGB signals to a DP9F connector and use a VGA to 5 BNC cable to your monitor and you're done.

[rydz]

Hi, s8n & RGB32E
Unfortunately adding 220uf (electrolits) didn't work for me. They are connected properly (to PS2). I'm confused with this sheme: http://digilander.libero.it/jackda/tutorials/ps2Vga_FINAL_DIAGRAM_NO_GREEN_SCREEN.jpg because they are suggesting 220uf ceramic one but IMHO they don't exist (I was searching on google and haven't found it, only electronics one). I've tried to add 0,220uf but it also didn't work. (black screen).
I've updated "adaptor" to use ucy7404 (+capacitors) but nothing happened :-/

I'm not interested in ready-to-use solutions, I'd preffer to finish this on my own.

I don't want to change anything in my console to synchronize before messing with colors

One more quesion about the sheme, if my monitor supports SOG, what should I connect to monitor?
RGB kolors, and to 10-pin with d-sub ground for example from green color?

I've found on producent official site information about the input:
separated, analog RGB, 0.7Vp-p/75 ohm, plus

[RGB32E]

One more quesion about the sheme, if my monitor supports SOG, what should I connect to monitor?

The attached picture should clarify... connect:
PS2/3 to HDDB15 (VGA monitor with SoG capability)
red video -> pin 1
green video -> pin 2
blue video -> pin 3
red ground/ground -> pin 6
green ground/ground -> pin 7
blue ground/ground -> pin 8

[rydz]

Hi,
Unfortunately that sheme didn't work for me. Monitor displays: "no signal" (so I have to give separate synchronisations h/v). Do you have any idea how can I get rid of that green color?

[viletim]

rydz,
I have this. I don't remember much about it, maybe there's an associated forum thread...

[RGB32E]

Hi,
Unfortunately that sheme didn't work for me. Monitor displays: "no signal" (so I have to give separate synchronisations h/v). Do you have any idea how can I get rid of that green color?

Yeah, I'm not surprised that it didn't work.  Typically, only higher end monitors support SoG (should always be listed in a given monitor's manual).  The schematic viletim posted above looks like WAY too much work to resolve the issue.  Like I stated before, just pick up an Extron RGB interface second hand -or- buy a better computer monitor, and be done with it! 

[rydz]

RGB32E: I'm not sure about your idea - still looking for solution
viletim: what exactly this scheme do?

[viletim]

viletim: what exactly this scheme do?

When the sync pulse is high (active video) the signal is passed through to the output, when the sync is low (retrace) the output is switched to a reference voltage. When the reference voltage is adjusted to the same level as video 'black' then the sync is effectively removed from the video signal. At least that's the theory, I don't remember how well it works in practice.

[RGB32E]

RGB32E: I'm not sure about your idea - still looking for solution

The idea is that you pipe the RGB signals from the playstation through an RGB interface.  The purpose of the RGB interface is to input RGB in a choice of sync configurations (e.g. RGsB - Sync on Green, RGBS, RGBHV) and to output RGB in a choice of sync configurations (e.g. RGsB - Sync on Green, RGBS, RGBHV).  So, with a device such as the Extron RGB 130xi, you input RGsB, and output RGBHV to your computer monitor.  Also, a number of different Extron RGB interfaces have controls for horizontal and vertical image shift, levels (raise or lower the video voltage level), and peaking (sharpness).  I hope that clarifies. 

What you're doing right now is effectively connecting RGsBHV to your computer monitor.  The extron devices will extract the sync from Green video and remove the sync info on the green video output.

Also, I checked out the manual for your LG 700B, and it does not accept RGsB.  I did notice in the "Setup" menu of your monitor that there is a levels adjustment (0.7Vp-p or 1.0Vp-p).  While the levels adjustment may not fix your problem, it might be fun to play around with! 

[NeWmAn]

Rydz: if you don't have fear to mod your ps2 take a look at this page of the wiki:
http://gamesx.com/wiki/doku.php?id=av:playstation_2_rgb_sync
There are also some interesting threads in this forum subsection, look for posts by user "RARusk" (Wiki's author)

If you want an external circuit you have to subtract the sync offset from the signal, read this for example:
http://www.hauppauge.co.uk/board/showpost.php?p=47581&postcount=16

[rydz]

Hi,
Thanks for all answers.
I've connected PS2 through KVM to the monitor, and the KVM removes green color, but sometimes it still appears.
It's a temporary solution, because doesn't remove the problem, cause:
- green color sometimes appears
- screen is dark (adding 220uF 16v (electrolic) doesn't help, still dark screen)
I've made some photos of this solution: http://rydz.glt.pl/ps2vgaANDkvm/

I'm going to take out the synchronization from the PS (it'll be hard, because in 30004R there isn't any good place to get out the signals).
If I do something I'll sure write!

Thanks for help
rydz

[l_oliveira]

When I did this I found points on the PS2 where I could extract H and V synchronism before the mixing and also I found a jumper to disable SoG on the RGB processor (it exists only on the early boards with separated composite/Svideo DAC and RGB buffer/mixer chip)

The early PS2s have the video DAC inside the GS (Graphics Synthesizer) chip and just a frontend processor/buffer/amplifier which is software controlled to perform the conversion from RGB to YCbPr, buffer if the bios is set to RGB and mix Sync on Green if the bios is set to RGB *and* progressive scan was enabled.

With the SoG jumper set to off, the PS2 will *NOT* output any sync on any pins of the A/V connector as the standard outputs (CVBS and S-Video) get disabled during progressive scan mode. So the only way to use VGA with it while SoG is disabled is "catch" the sync signals as they come out from the GS chip and amplify them.

Since they're 3.3vish I used a 74HC245 to buffer. That was the easiest way to perform this modification (I made it internal and added a VGA connector to the PS2, which connects to the PS2 internals through a 8 way flatcable)

I will look for pictures and schematics here on my archives if anyone is interested in this kind of mod.
It's also fairly documented on the psx-scene website (I also post there as l_oliveira)

[rydz]

l_oliveira: thanks for replay and info.

I've found h/v synchronization points on my V5. I'm still waiting for 74hc245.
I'm thinking of connecting 74hc245 to input and output (2, 9 and 11, 18 pins) but synchronization h/v are in other place then on photos (pins: 5, 7 and 13, 15). Are both connections correct?
Also on those photos there is something connected to the pin 10. But I can't see it on the sheme. What should be attached to that pin?
Can I connect the pin 32 on A3525BR to the ground or should I look for other place on board?
Last question: Can i connect 74hc245 to the a/v (pin 10) electric current?

Thanks for help
rydz

[l_oliveira]

l_oliveira: thanks for replay and info.

I've found h/v synchronization points on my V5. I'm still waiting for 74hc245.
I'm thinking of connecting 74hc245 to input and output (2, 9 and 11, 18 pins) but synchronization h/v are in other place then on photos (pins: 5, 7 and 13, 15). Are both connections correct?
Also on those photos there is something connected to the pin 10. But I can't see it on the sheme. What should be attached to that pin?
Can I connect the pin 32 on A3525BR to the ground or should I look for other place on board?
Last question: Can i connect 74hc245 to the a/v (pin 10) electric current?

Thanks for help
rydz

1- You can get the 74F245 or even the HC type part from scrapped 90s PCs, btw ...
2- You set a fixed direction on the 74HC245 by connecting the direction pin to +5V (connect pin 1 to pin 20) and use pins 2 and 8 as inputs. You can use any of them but you only need to make sure you're using the respective output for the input used. like for example signal on pin 2 will be output at pin 18 and signal on pin 9 will be output at pin 11.  Don't forget also to set pin 19 to GND (it enables the chip, if it is not set to GND the inputs will not be output on the other side of the chip.
3-You connect the outputs from the 74HC245 directly to the VGA connector. The RGB signals also go directly from the PS2 out port to the VGA connector.
4- the pin 32 of the CXA3525BR chip is connected to a 10k resistor if I am not forgotten. I suggest you to just move the resistor to the other empty position close to it. You will notice it looks like a jumper (2 spots for resistors which only one is populated)
4- Yes, you can use power from the PS2 A/V port.

Hope this was helpful.   

[rydz]

Hi, I've connectedall, pics with synchro:
http://rydz.glt.pl/vga/montaz/BOTTOM.JPG
http://rydz.glt.pl/vga/montaz/TOP.JPG

And here with clean board from both sides:
http://rydz.glt.pl/vga/V5_BOTTOM_BLANK.JPG
http://rydz.glt.pl/vga/V5_TOP_BLANK.JPG

next pics with pointed synchro ASO:
http://rydz.glt.pl/vga/V5_BOTTOM.JPG
http://rydz.glt.pl/vga/V5_TOP.JPG

after connecting PS2 to the monitor using synchronization I have 2 problems:
1. horizontal refresh has only 15 kHz and the minimum should be 31 kHz (it's strage because pin 32 is GND-ed, and to have vision I must force VGA mode in modchip)
2. Colors are dark, the same was when I've connected monitor through lm1881m (adding 220uF (electrolic) didn't change anything).
It's very strage I don't get right horizontal refresh..
Do u have any idea how to fix it and why I've got this problem?

Good I get rid of green color at last!

best wishes
rydz

[NeWmAn]

1. horizontal refresh has only 15 kHz and the minimum should be 31 kHz (it's strage because pin 32 is GND-ed, and to have vision I must force VGA mode in modchip)

That's how it's supposed to be: the ps2 isn't going to output a 31KHz signal without software enabling it.

[rydz]

1. horizontal refresh has only 15 kHz and the minimum should be 31 kHz (it's strage because pin 32 is GND-ed, and to have vision I must force VGA mode in modchip)

That's how it's supposed to be: the ps2 isn't going to output a 31KHz signal without software enabling it.

That's strange - doesn't connecting SONGEN to the GND turn on progressive scanning (31kHz)?

@l_oliveira: Did u use: http://psx-scene.com/forums/attachment.php?attachmentid=9151&d=1138033780 ?