Saturn RGB issues on a Sony KV-14T1U TV

I've recently bought Sony Trinitron KV-14T1U and I'm having some difficulties with it with regards to my model 2 Jap white Sega Saturn, and my model 2 jap This is Cool Saturn.

I plugged it in using my white Saturn with what I believe to be and RGB cable. When I select the AV input the picture appears in colour for less than a second and then goes black and white, this is also the same result with the This is Cool Saturn. Though weirdly when I put the teletext on the picture changed to colour but was of a poor quality.

I tested a US NTSC PS2 slim with an NTSC game using an RGB cable and this was ok and had no issues. I also tried a Jap Megadrive with an RGB cable, and this again caused no issues.

This Sony TV is my 2nd Trinitron 14", the other being a KV-14LM1E and all my systems work on this using RGB Scart cables, including both Saturns.

So from what I can gather the KV-14T1U appears to be able to handle an NTSC signal because if it couldn't then the PS2 and Megadrive wouldn't work, right?

Is the TV a lost cause as far as my Saturn is concerned or would a new RGB Saturn cable help?. If anyone could help it would be greatly appreciated as the TV displays a great picture when it works right.

Thanks

 

Sounds like the cable isn't rgb or it doesn't have the resistor to tell the TV to switch to rgb mode. Open up the scart end of the cable and post some pictures.

 

When I'm next at my folk house (all my retro stuff is in storage there) I'll pop it open and take some shots and post them here.

Thanks

 

x

 

Who said anything about a PVM??

Moved to mods, as you need to mod your cable If you do a search, you'll find this issue a number of times. Yes, your cable is incorrect - you're using a UK cable on a Japanese Saturn. Or, at the very least, poorly constructed.

 

huh? Really, I thought they where the same on the console side. I used one of Bacteria's pinouts on my JAP saturn, worked fine (he's in the UK). Although I used composite for sync

 

Yeah I figured it's more than likely the cable. It's just odd that on another similar Sony CRT set the cable works with no issues and gets me a colour picture. I've been in touch with RetroGamingCables who has advised one of this cables should do the trick.

@retro thanks I'll have a look in the
Mods forum for more info on the subject.

Thanks for all the replies.

 

No problem - it'll either be in mods or repairs that you'll find previous topics.

The problem is often that people don't know how to make a cable that is in spec. Sometimes, you might have a less tolerant television or some kind of anomaly - basically check all the output levels as per the Peritel standard.

 

its probably csync on the 9v line and on that tv its not switching to RGB mode as level too low (and obviously fluctuating) and other TV just accepts it

 

RGB switch is 1-3 volts. The SCART cable should be switching off 5 volts - if only because it's the same on both systems. There's a shared 9 volt / sync pin that would cause issues either if you're trying to get sync or 9 volts off it.

The other thing to remember is that not all SCART sockets are wired for RGB. This being a 14 inch set will not have that issue, though (and the service manual confirms the SCART is wired for RGB, as you'd expect).

 

Japanese Saturn needs the 21P J-RGB cable from Sega Japan for Japanese Saturn.
Then you will need the adapter cable to hook that one to monitor which expects the PAL format RGB cable.

 

x

 

5v is for 16:9, 4:3 needs 9v on pin 8. Unless I misunderstood your post, you want 9v for scart switching, which is why the pal Saturn has it and the ntsc ones don't.

Then it goes via a resistor for the rgb switching. But if you have a csync signal on pin 8 (which is what happens if you use a pal rgb cable on an ntsc console) you have a much lower voltage level which isn't consistent as its not a solid voltage (rightly so for a signal line).

 

You said RGB mode:

If you're talking about pin 8, its switch mode is actually 0-2 volts = off, 4.5-12 volts = on. However, it really does 4.5-7 volts (sometimes listed as 5-8 volts?!) as the 16:9 switch, and 9.5-12 volts as "peritelvision" (the 4:3 switch). 9 volts should technically confuse it ;-)

In the original Peritel standard, pin 8 is referred to as function switching (basically aerial, external socket or external socket for a 16:9 picture), whereas pin 16 is referred to as blanking (or rapid switching... basically composhite or RGB - I don't think it originally specified that, though). Trust the French to be confusing! ;-)

Those are the main issues with home-built cables, certainly. Or incorrect sync. And yeah, that sounds the right way round on the PAL/NTSC differences - couldn't remember!

[EDIT]
Good grief, Xenforo - that was some shocking formatting!

 

Yes I said rgb mode, as it's usually a wire to pin 8 from the console and a resistor to pin 16 to select rgb mode. Most TVs will still work without the signal on 8 (just switch to the channel manually). The same can't be said on low voltage for rgb selection.

The power source comes from the same pin on the saturn for both pin 8 and 16, the resistor in the cable is selected based on a 9v supply to pin 8. If you use a ntsc console with a pal cable, you have csync (5v signal level, but obviously fluctuatating which is yet another issue) then the power that gets to the rgb via this resistor will be effected too. And the TV won't be in rgb mode.

So either you need to put 9v in the correct place (which isn't easy as no 9v supply on ntsc Saturn's iirc) or you need to wire up 5v and change the resistor.