TV RGB mod thread

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mikejmoffitt
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mikejmoffitt »

Okay, 0.1uF caps (Little ceramic buddies labeled 104) were perfect. All systems are looking great and performing as expected.

Now I can do a simple writeup and maybe allow others to try something similar for themselves.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by leonk »

mikejmoffitt wrote:Okay, 0.1uF caps (Little ceramic buddies labeled 104) were perfect. All systems are looking great and performing as expected.

Now I can do a simple writeup and maybe allow others to try something similar for themselves.
When doing the writeup, it would be worthwhile to include information on what is expected between the system out all the way to the jungle chip (for those of us that have SCART cables with caps/resistors, and those that don't).

Much appreciated in all your effort!!!
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Voultar »

Voultar wrote:Yeah, for fun, do a 75 ohm termination with .1uF coupling cap on pins 26-28. It looks like pin 25 is used to blank for those particular inputs.

Yeah, the 10uF cap was probably too big, hence why it took longer for the voltage to load up to affect brightness. The .1uf couple caps are what you wanna use there.


That's typically why you have a 2nd set of RGB inputs on the Jungle. PAL sets typically have two, one designated for RGB, the other for OSD super-imposing. Sometimes they're multiplexed.

How much voltage are you feeding into the blanking?

Did you do this?
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mikejmoffitt »

The final configuration is this:

R/G/B in --> 75R to Ground --> 0.1uF ceramic cap (104) --> CXA2033S R/G/B input.

The blanking pin (pin 29) is being given 5V when RGB is active.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Voultar »

mikejmoffitt wrote:The final configuration is this:

R/G/B in --> 75R to Ground --> 0.1uF ceramic cap (104) --> CXA2033S R/G/B input.

The blanking pin (pin 29) is being given 5V when RGB is active.

Told ya so.

Now, was that so hard? :wink:
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mikejmoffitt »

Not hard, just the issues that various other configurations gave were a bit misleading to me :P

Got the focus really nice in the center of the tube:

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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Voultar »

Very good. Glad to help!
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by leonk »

I'm itching to try it out myself. I have access to a KV-27FS13 or KV-27FS100

Any suggestions on which one will be a better candidate for the mod?
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by bobrocks95 »

I'm curious if this model in the thread (KV-27S42) is what people would call the best consumer curved Trinitron? I know the KV-xxFV310 is the best flat model available- did you guys just have this model on hand or did you seek it out?

EDIT: Also, where did you both go to find datasheets for your Jungle chips? I've got a CXA2154AS and some sites are saying the 2153 is "equivalent" but I don't know how accurate that statement is. Any general guidelines to know if it even has a chance of RGB being added?
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by BazookaBen »

Oh crap, are you guys doing these to Trinitron's that were pre-component video? As in the best they had was S-video?

I may consider trying this in that case, since I'm not really a fan of how most component-capable Trinitrons were flat (maybe all). I'd really like a curved tube that can do something beyond s-video.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mvsfan »

Found my jungle ic.

Image

the tv is a kv-32fs120.

I was a bit unsure what pin im supposed to feed 5v to to turn the rgb lines on.

Im assuming its the 3 pins 25, 26, 27 for YUV in that get switched to rgb since it looks like i only have 1 set of input on the chip.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by bobrocks95 »

mvsfan wrote:Found my jungle ic.

the tv is a kv-32fs120.

I was a bit unsure what pin im supposed to feed 5v to to turn the rgb lines on.

Im assuming its the 3 pins 25, 26, 27 for YUV in that get switched to rgb since it looks like i only have 1 set of input on the chip.
Sure that isn't a comb filter or something? My Jungle chip has 30 pins in a through-hole IC with RGB inputs, OSD RGB inputs, and the like. It's part number isn't close to any other Jungle ICs either.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mvsfan »

I see where it says comb on this diagram.

I think your right bobrocks. whoops.

Ill have to look at that again.

Edit: on another diagram it says Video processor/comb filter.
from the diagram the inputs look like they are all hooked up to this chip.
I dont see any other chips on the diagrams with lots of things hooked up to them like this one.

n
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Voultar »

I just want to say something, and in no way do I mean to be a dick.

If you don't have experience or knowledge in servicing HV equipment. You probably need to just step away and do some thorough research. This isn't something you want to play with and "get wrong". You can get seriously, seriously hurt here.

I helped mikejmoffitt because he knows how a CRT (by principle) works. I wouldn't have felt guilty had he shocked his nuts off into the next plane of existence.

PROCEED AT YOUR OWN RISK!
mvsfan wrote:Found my jungle ic.

the tv is a kv-32fs120.

I was a bit unsure what pin im supposed to feed 5v to to turn the rgb lines on.

Im assuming its the 3 pins 25, 26, 27 for YUV in that get switched to rgb since it looks like i only have 1 set of input on the chip.
That Jungle I/C operates only in the YUV color space. Those aren't RGB inputs. Two totally different standards, as well as video signals.


leonk wrote:I'm itching to try it out myself. I have access to a KV-27FS13 or KV-27FS100

Any suggestions on which one will be a better candidate for the mod?
My suggestion is to grab the service manual for each set and review both of their capabilities. I just reviewed them both, so I'll tell you to stay away from the 27FS13 as its Jungle I/C operates only in the Luma & Chroma colorspace. You'd have to drive the guns directly on that set, and I'm not going to go back and forth on an AC coupled video circuit. :)



The 27FS100 however, is a winner.

Image


Just use the information that I gave in the thread.

Pins 41, 42, and 43 are your RGB inputs. Take them out of circuit, and tie 75 ohm resistors to ground to match impedence for the 75 ohm load, and add a .1uf coupling cap for black level restoration.

Pin 40 is blanking. Tie pin 40 high to a low voltage source (3v-5v) when you want to enable the RGB input.

If you want me to get REALLY technical...

1) Buy a female SCART socket that's panel mountable. Why? because it's a fucking standard. And even though I roll my owns cables, I like standards. Of course, you can use whatever you want.

2) If you're doing SCART. Wire it up per the SCART standard, I prefer Euro. (Do your 75ohm to ground terminations as well as your .1uF DC caps on the OUTPUTS of the connector to simplify things.)

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3) Be a real man and use a template to cut out your SCART connector port.

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4) Wire that shit up. Hijack stereo audio and sync from a set of composite inputs. If you're wiring a switch (I use a 6PDT) to switch your OSD lines and RGB inputs, wire that shit up, too.

Image

5) Button it all together.

Image


I've touched on this in passing on various threads when people ask me about doing this. It starts in the service manual. Look up the service manual for the set you'd want to do and review the block diagram, schematics, and chips employed.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mikejmoffitt »

BazookaBen wrote:Oh crap, are you guys doing these to Trinitron's that were pre-component video? As in the best they had was S-video?

I may consider trying this in that case, since I'm not really a fan of how most component-capable Trinitrons were flat (maybe all). I'd really like a curved tube that can do something beyond s-video.
Yep, this one only had S-video. The beautiful cylindrical-shaped tube sort.

I mounted my ports like this:

http://i.imgur.com/NRcghkk.jpg

There's a nifty switch near the front so I can reach it without difficulty:

http://i.imgur.com/gouPvK3.jpg

I think my yoke needs readjustment. The magnetic rings on the neck are more or less stuck in place. I managed to free a few, but they don't want to rotate far, and I do not wish to force them in case they break which I have dealt with before.

I've always adjusted the yoke and neck rings while the set is switched off, then powered it on to see results and then adjust further. Can I get a sound confirmation on which parts of the neck I should / should not touch? Obvious no-nos includes the conductive side of the neck board and by extension the CR-9 socket.

As for stealing sync, at least on this set I recommend using S-video's luma line, because that has a different H offset that is exactly what is needed, without any fucking around. Composite was shifted to the left to account for time needed for the comb filter and more importantly composite video decoding.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Skips »

I know this sounds dumb but some tubes you have to not only break the epoxy like substance to move the rings but you may also have to undo a clamp somewhere on the neck. I can't remember the model but one of the older PVM's I used to have required I undo the screw clamp on the neck before I could adjust the rings.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Voultar »

mikejmoffitt wrote:
As for stealing sync, at least on this set I recommend using S-video's luma line, because that has a different H offset that is exactly what is needed, without any fucking around. Composite was shifted to the left to account for time needed for the comb filter and more importantly composite video decoding.
That's a good point. You can always try using Luma as a sync source to get around the processing delay of C-Video. Your mileage will vary, though. Some sets it just won't matter, it's all depends on how it's processed.

As for what to touch and not to touch. Stay away from the neckboard, and stay away from the anode cup. Never trust those old rubber seals. The bell of the CRT is relatively safe to bump. These sets are designed for live adjustments, so as long as you pay mind to a couple of things, you'll be fine.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by atheistgod1999 »

mikejmoffitt wrote:
BazookaBen wrote:Oh crap, are you guys doing these to Trinitron's that were pre-component video? As in the best they had was S-video?

I may consider trying this in that case, since I'm not really a fan of how most component-capable Trinitrons were flat (maybe all). I'd really like a curved tube that can do something beyond s-video.
Yep, this one only had S-video. The beautiful cylindrical-shaped tube sort.

I mounted my ports like this:

http://i.imgur.com/NRcghkk.jpg

There's a nifty switch near the front so I can reach it without difficulty:

http://i.imgur.com/gouPvK3.jpg

I think my yoke needs readjustment. The magnetic rings on the neck are more or less stuck in place. I managed to free a few, but they don't want to rotate far, and I do not wish to force them in case they break which I have dealt with before.

I've always adjusted the yoke and neck rings while the set is switched off, then powered it on to see results and then adjust further. Can I get a sound confirmation on which parts of the neck I should / should not touch? Obvious no-nos includes the conductive side of the neck board and by extension the CR-9 socket.

As for stealing sync, at least on this set I recommend using S-video's luma line, because that has a different H offset that is exactly what is needed, without any fucking around. Composite was shifted to the left to account for time needed for the comb filter and more importantly composite video decoding.
Man, I had a couple consumer-grade sets before going the BVM route that had horrible convergence issues, and both were trinitrons. The first one I think was your model. That one had much worse convergence than yours, though. Anyway, with both TVs, I was trying to adjust the magnetic rings, and on both of them I accidentally snapped off one of the handle tab things that help me move it. I could still move it, it was just harder. Don't break the tabs (and I'm not talking about the thing on the BVM that I broke; I'm talking about the tabs on the magnetic rings).
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mvsfan »

Voultar wrote:I just want to say something, and in no way do I mean to be a dick.

If you don't have experience or knowledge in servicing HV equipment. You probably need to just step away and do some thorough research. This isn't something you want to play with and "get wrong". You can get seriously, seriously hurt here.

I helped mikejmoffitt because he knows how a CRT (by principle) works. I wouldn't have felt guilty had he shocked his nuts off into the next plane of existence.

PROCEED AT YOUR OWN RISK!

thanks. I have a high voltage probe and i know how to discharge a crt with it.
mvsfan wrote:Found my jungle ic.

the tv is a kv-32fs120.

I was a bit unsure what pin im supposed to feed 5v to to turn the rgb lines on.

Im assuming its the 3 pins 25, 26, 27 for YUV in that get switched to rgb since it looks like i only have 1 set of input on the chip.
That Jungle I/C operates only in the YUV color space. Those aren't RGB inputs. Two totally different standards, as well as video signals.

got it now. chip wont work. get another tv. ;P back to craigslist.

btw, do any of the flat screen trinitrons have the right chip or are they all Yuv?
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Guspaz »

The quality difference between RGB and YUV converted to RGB is going to be minimal to non-existent.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by bobrocks95 »

Guspaz wrote:The quality difference between RGB and YUV converted to RGB is going to be minimal to non-existent.
I'm not sure what you're getting at here, or who you're addressing.

This thread is for adding an RGB input to a Trinitron for convenience, not that it will necessarily look better.
The previous post about the Jungle chip is about determining if the set can be modded to accept straight RGB. A YUV-only Jungle IC is not capable of accepting RGB of course.

I just don't know what point you were getting at exactly?
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by mikejmoffitt »

mvsfan wrote:
Voultar wrote:I just want to say something, and in no way do I mean to be a dick.

If you don't have experience or knowledge in servicing HV equipment. You probably need to just step away and do some thorough research. This isn't something you want to play with and "get wrong". You can get seriously, seriously hurt here.

I helped mikejmoffitt because he knows how a CRT (by principle) works. I wouldn't have felt guilty had he shocked his nuts off into the next plane of existence.

PROCEED AT YOUR OWN RISK!

thanks. I have a high voltage probe and i know how to discharge a crt with it.
mvsfan wrote:Found my jungle ic.

the tv is a kv-32fs120.

I was a bit unsure what pin im supposed to feed 5v to to turn the rgb lines on.

Im assuming its the 3 pins 25, 26, 27 for YUV in that get switched to rgb since it looks like i only have 1 set of input on the chip.
That Jungle I/C operates only in the YUV color space. Those aren't RGB inputs. Two totally different standards, as well as video signals.

got it now. chip wont work. get another tv. ;P back to craigslist.

btw, do any of the flat screen trinitrons have the right chip or are they all Yuv?
The FS100 looks to be RGB-happy.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Guspaz »

bobrocks95 wrote:
Guspaz wrote:The quality difference between RGB and YUV converted to RGB is going to be minimal to non-existent.
I'm not sure what you're getting at here, or who you're addressing.

This thread is for adding an RGB input to a Trinitron for convenience, not that it will necessarily look better.
The previous post about the Jungle chip is about determining if the set can be modded to accept straight RGB. A YUV-only Jungle IC is not capable of accepting RGB of course.

I just don't know what point you were getting at exactly?
I was addressing the mentality of "I guess I'll get rid of this TV and get a different one because it only supports YUV", and if the goal is to get an improvement in image quality by moving from composite to RGB, then YPbPr would serve that goal just as well, and you can get like a $30 passive board to do that conversion, put it inside the TV, and still wire up whatever kind of RGB SCART connector you want. If the goal is RGB input into the TV, that'll get you it, without any real difference in quality...

On the other hand, I'm realizing that the post said the TV does YUV, not YPbPr, so that's a whole different story. I see boards for $25 that do YUV to RGB, but not the other way around.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by bobrocks95 »

Guspaz wrote:I was addressing the mentality of "I guess I'll get rid of this TV and get a different one because it only supports YUV", and if the goal is to get an improvement in image quality by moving from composite to RGB, then YPbPr would serve that goal just as well, and you can get like a $30 passive board to do that conversion, put it inside the TV, and still wire up whatever kind of RGB SCART connector you want. If the goal is RGB input into the TV, that'll get you it, without any real difference in quality...

On the other hand, I'm realizing that the post said the TV does YUV, not YPbPr, so that's a whole different story. I see boards for $25 that do YUV to RGB, but not the other way around.
Okay, yeah I see where you're coming from. In this case though, I think the TVs that have been talked about so far only support up to S-Video and not component. If you got it for free and thought it could be RGB modded it's not a bad idea to pass it on.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by atheistgod1999 »

Why do chips matter? Can't you just hook the RGB wires straight to the electron guns?
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by bobrocks95 »

I don't know if you're being sarcastic or not but the chip is a fairly complex pre-amp that, looking at the block diagram for mine, mixes in settings (contrast, sharpness, brightness, etc.) and performs some sync separation as well I believe. I have little experience with block diagrams so I might be wrong, but it's a 64-pin package on my TV and is probably doing more than you might be assuming.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by atheistgod1999 »

bobrocks95 wrote:I don't know if you're being sarcastic or not but the chip is a fairly complex pre-amp that, looking at the block diagram for mine, mixes in settings (contrast, sharpness, brightness, etc.) and performs some sync separation as well I believe. I have little experience with block diagrams so I might be wrong, but it's a 64-pin package on my TV and is probably doing more than you might be assuming.
Yeah, well that's only when everything's relative like on an NTSC signal. When I display RGB on my BVM, all those options are disabled.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by darcagn »

atheistgod1999 wrote:
bobrocks95 wrote:I don't know if you're being sarcastic or not but the chip is a fairly complex pre-amp that, looking at the block diagram for mine, mixes in settings (contrast, sharpness, brightness, etc.) and performs some sync separation as well I believe. I have little experience with block diagrams so I might be wrong, but it's a 64-pin package on my TV and is probably doing more than you might be assuming.
Yeah, well that's only when everything's relative like on an NTSC signal. When I display RGB on my BVM, all those options are disabled.
It shouldn't disable those options just because you're on RGB...
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by bobrocks95 »

atheistgod1999 wrote:Yeah, well that's only when everything's relative like on an NTSC signal. When I display RGB on my BVM, all those options are disabled.
The RGB inputs on your BVM probably run through at least 3 or 4 ICs too before they reach the electron guns.
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Re: 27" Trinitron to RGB mod success (KV-27S42)

Post by Guspaz »

PVMs/BVMs disable the chroma and phase settings/controls when on RGB, because those settings don't make sense for RGB.
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