Problem with PC Engine RGB mod and Sony PVM 2030 (SOLVED)

[sabravof]

Hi guys. I just bought a PC Engine and in a store and they made the RGB mod. The problem is that the image in the PVM is very very dark, near black, you can't play. I tough that could be the cable, is the Saturn Scart cable, and i tested the console with a Scart to YUV conversor, but the results was the same. The technician tested the PC Engine with the same cable on a Scart to HDMI conversor and works perfect.
What do you think that can be?
By the way, the mod that he made was this:

http://www.mmmonkey.co.uk/pc-engine-rgb-mod/

This is the Scart to Yuv conversor that i have
http://www.ebay.com/itm/NEW-SCART-RGB-t ... yF2RvMlcww


This is the Scart to HDMi that the technician use
http://www.ebay.com/itm/Scart-HDMI-to-H ... Swu-BWQGft

This is how it looks with the monitor and the Scart to Yuv conversor

https://www.dropbox.com/s/tc5jxf50rerne ... .jpeg?dl=0

And this with the Scart to HDMI
https://www.dropbox.com/s/4kkicg1ksnw5o ... .jpeg?dl=0



Thanks in advice, and sorry for my english.

[kamiboy]

That mod is not exactly the best that exist for the PC Engine. Compared to the other solution it is very rudimentary. As for your problem, it could be many things. For one, are there any 220UF caps in the SCART cables?

[leonk]

The problem with this mod is that it's incorrect.

The expansion port in the back is meant to be used by an add-on which internally has amplifiers for the video and audio signal. If you feed RGB and audio directly to the newly installed AV port, without amplifying the signal, you will experience what you see.

This is why people sell RGB amps for NEC consoles.

[sabravof]

That mod is not exactly the best that exist for the PC Engine. Compared to the other solution it is very rudimentary. As for your problem, it could be many things. For one, are there any 220UF caps in the SCART cables?

No, i don't think the cables have any caps, it's a cheap one. For the moment i don't have any other cable to test with it.

[leonk]

You need RGB amp. HDMI converter is amping signal for you. TV is expected 0.7v pp which is you are WAYYYY under.

[sabravof]

The problem with this mod is that it's incorrect.

The expansion port in the back is meant to be used by an add-on which internally has amplifiers for the video and audio signal. If you feed RGB and audio directly to the newly installed AV port, without amplifying the signal, you will experience what you see.

This is why people sell RGB amps for NEC consoles.

The guy told me that he put the amplifier on the console, but my concern is why the mod works whit his scart to hdmi conversor. Also, i tested with an Saturn AV cable and works normally (but AV )

[Fudoh]

adding caps to the RGB lines in the cable will most likely fix your problem. It's the same effect when using a PAL SNES cable on a NTSC unit.

@leonk: the mmmonkey mod shows an amp, so I assume his technician added this as well. It's just the caps that are missing.

[sabravof]

adding caps to the RGB lines in the cable will most likely fix your problem. It's the same effect when using a PAL SNES cable on a NTSC unit.

@leonk: the mmmonkey mod shows an amp, so I assume his technician added this as well. It's just the caps that are missing.

Fudoh, thanks for answering. Yes, the technician added the amp, so could be the caps on the cable.
By the way, i'ts your fault that i'm obsessed with RGB and PVM's

[leonk]

Did you "technician" remember to replace the 2 caps to remove Jailbars in the RGB image?

[sabravof]

Did you "technician" remember to replace the 2 caps to remove Jailbars in the RGB image?

I don't know. He told me that he put the 220uf capacitors inside the console and for that, the cable doesn't matters.
They're not going to do anything more on the console and tomorrow i'm going to bring it to my house. I don't want to stick only to the AV , i hope that you can help me to get the PCE work on my PVM.
Tomorrow i'll post photos of the MOD and the cable.

[leonk]

If you feel comfortable opening the console and providing pictures of the inside, we can help you out more.

[sabravof]

If you feel comfortable opening the console and providing pictures of the inside, we can help you out more.

Here are some photos. I hope that you can find something.

https://drive.google.com/folderview?id= ... jlLZXIxRXc

[leonk]

OMG.. looks like a rat's nest.. The only thing that can be worst than this is hot glue all over. Why anyone will use paper tape is beyond me. When that stuff dries (from heat) it hardens and leaves behind crusty residue that's almost impossible to remove.

Sorry, but that doesn't look professional at all. There are lots of really good NEC RGB kits out there that come professionally assembled. Check out the buy and sell forum here, or eBay or even Otaku store sells a great RGB kit that's not that expensive.

Any good RGB modder should have pushed you into them purchasing the kit and installing it for you.

There's just too much tape everywhere to see what's what. If you really want to save this, I suggest you find a competent modder that is close to you, and start over.

Sorry.

[leonk]

BTW.. based on your pictures, there is no RGB amp. It seems all he did was put 100uF capacitors in-line. Where he got this crazy idea is beyond me.

[yxkalle]

There is an amp. I can see three transistors. If it's wired and works as intended is another question...

[sabravof]

There is an amp. I can see three transistors. If it's wired and works as intended is another question...

I see. Now i'm understanding how it works th mod. Tonight, if i have some time, i'm gonna try to follow every connection and make a diagram to show you what it's wired. Also, i'm gonna remove the paper tape.

Thanks guys.

[gojira54]

I noticed the composite video is being used instead of clean sync...
Better off with a ths7314 amp mod?
Can't say that mod work is too pretty but if it works, it works...

[Voultar]

That's some shitty modwork. It looks like something OGHugo would tape together.

[bobrocks95]

Nearly spat out my drink when I saw how that DIN connector was wired.

[sabravof]

Hi guys, finally i had some time today and i understood how was made the Mod, and i realize that some parts wasn't connected, so i fix it and now it's working perfectly and the image it's clear as it's supposed to be.

Here are some photos

https://goo.gl/photos/GMU3T3WG76e7N9EK6

The problem was that the guy that the made the mod didn't connect the C21 (5v) and the C22 (C- Sync) pins of the PC Engine with the Pin 4 and the pin 1 respectively on the Saturn 10 pin Mini Din Connector , thats why when he test it on his Scart to HDMI worked, because the Pin 8 was connected and the HDMI conversor was upscaling the composite video signal. When i tested it, worked, but the image was dark, so i removed the 100 uf capacitors and that was all, perfect image.

Thank's for everything guys.