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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 11, 2020 11:17 am 



Joined: 11 Jun 2020
Posts: 4
abispac wrote:
So my niece gave me a 19 ich tv its a curtis matches tronics model cm19022s, i could not locate a service manual, it has two chips, a toshiba ta1282n and a zilog 5007 or szm-370th1, i couldnt find information on the zilog chip , but the toshiba i got the pdf datasheet and a gif image Image
https://datasheetspdf.com/pdf-file/4929 ... /TA1268N/1

Now according to the datasheet and the image, 14 its my blank signal, 15,16,17 are rgb, so it should be a straight mode right?
Image Image Image Image

So I just realise i have the same chassis as the 8bit guy, the same, it might be a little bit more modern but its the same ---smurfing--- one, so all i got to do to succeed its just straight copy his mod ,but i did the mod, exactly as the 8bit guy did, i also had no smoke coming up after getting everything together again, ill just need to test it with groovymame,So i can say im almost done with this mode, i just cant figureout what im missing. I did everything exactly as the 8bit guy did, well, not the fancy conector, as i might add it later on. Hook my pc with my vga brekout cable, and bam, clear colors but bad sync
Image
So i started emudrivers on my other tv (i had both monitors hooked, i always do that on crtdrivers) and dont matter what settings i choose, 15khz, 31khz o 60 khz, i cant get this thing to sync. i can still see that colors are gonna be good, i ust need a bit of help in here please. So so far, as the 8bit guy did, the rgb cables have the 75ohm resistors terminated to ground, all grounds go to ground, i get the 5v volts from the same place, and the sync i try to get it from the yellow rca entrance on the back of the tv. but no luck. Do i need to add a 75ohn resistor on the sync cable as well? or do i need to build the vga cable has he did on his second video? thanks for any help.
This is how far i got.
Image

and a link to the second video where he builds the vga cable.

https://www.youtube.com/watch?v=NkpSBK3g-gA&feature=share


I also have this model and I was thinking about modding it. Funny thing is I took the TV back off tonight to see what kind of chips I had. Anyhow I've notice the AV connector on my television making poor connection so I made sure to re flow the solder on the AV portion before putting the back back on the TV. To be honest though I don't think I had cold solder points upon inspection I got a funny feeling it's yellow jack itself that probably bad. Try wiggling that yellow cable to see if that fixes your sync issue. We should keep in touch seeing how were attempting to mod the same set.


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 11, 2020 7:59 pm 



Joined: 11 Jun 2020
Posts: 2
Long time lurker, going to finally try and mod my KV27S42 this weekend.

Instead of soldering components to the wires, I’ve put them on strip board. That way, odds are any mistakes will be limited to an easily removable circuit board. I’m going to run jumper wires to the tv’s pcb.

Does it look like this will work for the connections to osd, jungle, and external RGB via BNC? I’m still getting my feet wet with electronics. I’ve checked continuity and didn’t find any shorts or errant connections.

https://imgur.com/a/ydtp3Fh

Red lines are where I cut the strips on the other side.


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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jun 15, 2020 5:53 am 



Joined: 13 Jun 2020
Posts: 1
Hi there, also a long time lurker of this forum. There is vast amount of information here, I appreciate you all for sharing your knowledge and work.

I am planning to RGB mod my Sony KV-20S10. I was hoping someone could review my steps in case I'm missing anything.

Details
    Jungle IC contains unused analog R,G,B IN pins, (16, 17, 18)
    Jungle is likely CXA1465AS or CXA1464AS, will confirm when set is opened
    will be using D-SUB 15 female connector, connecting to MiSTer only

Steps
    wire CSYNC IN -> Jungle pin 5 (C)
    wire R IN -> 25 ohm resistor, ground, 1uf capacitor -> Jungle pin 16 (R)
    wire G IN -> 25 ohm resistor, ground, 1uf capacitor -> Jungle pin 17 (G)
    wire B IN -> 25 ohm resistor, ground, 1uf capacitor -> Jungle pin 18 (B)
    wire SET5V -> rocker switch -> 100 ohm resistor -> Jungle pin 15 (YS)
    Disable VM via service menu
    If RGB analog pins turn out to be disabled, set everything on the ID side of the service menu to 1, reset the service menu with 8 + enter (thank you fandangos)

Questions
    Is it okay to solder to the legs of Jungle IC without lifting them?
    Is it safe to connect CSYNC IN to the Jungle without any resistance?
    How could I tell if my analog RGB pins have been disabled?

I collected my info from mods done by pcbjunkie, suprcrackers, GoXoD and fandangos. Thank you all for posting your work on this forum, it has been very helpful.


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 Post subject: Re: TV RGB mod thread
PostPosted: Tue Jun 16, 2020 9:18 pm 


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Joined: 16 Jun 2020
Posts: 91
Hello all, I've been wanting to try this for a while. I went out and picked up a Toshiba CF27E50 from a thrift store. It says the chassis is TAC 9515. Anyone modded this set? I haven't been able to find a service manual for it specifically, I did find one for a CF27D50, but I don't know what the difference is.

https://www.manualslib.com/manual/12458 ... e=3#manual


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 18, 2020 11:40 pm 



Joined: 20 Nov 2019
Posts: 58
Location: Australia
MarkOZLAD wrote:
cpyne wrote:
flynnsbit wrote:
Pin 38 Luma In is where sync is going in.

If you follow the diagram you'll see that the jungle is taking IF in, creating composite video that goes out the VIDEO OUT and then gets fed into the Luma and Chroma in pins.


Could I just tap csync right into pin 38? Or would some additional changes be needed since this is a luma input?


I would say you would want to 75 ohm terminate it and inject via a cap. Possibly want to disconnect the chroma line.

Just curious what rating cap you would recommend? I found a lower 10-100nF one had negative effects but a much larger 10-100MF seemed ok but probably overkill. So far i have just injected it straight from the luma pin (svideo mod..) as that always worked fine. Is it still best to have the 75R and coupling capacitor even if it's just for sync?


Last edited by jeffez on Fri Jun 19, 2020 12:12 am, edited 2 times in total.

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 Post subject: Re: TV RGB mod thread
PostPosted: Fri Jun 19, 2020 12:10 am 



Joined: 18 May 2017
Posts: 760
jeffez wrote:
Just curious what rating cap you would recommend? I found a lower 10-100nF one had negative effects but a much larger 10-100MF seemed ok but probably overkill. So far i have just injected it straight from the luma pin (svideo mod..) as that always worked fine. Is it still best to have the 75R and coupling capacitor even if it's just for sync?


I haven't done this exact mod myself so I don't know for sure but the patterns I tend to notice are 75 ohm termination and 100nF (0.1uF) capacitors. I have seen 1uF and 4.7uF used as well on the Y/External CVBS lines.

I would be consulting datasheets and alternate schematics to see what I could find out for the chip I was modding though.
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OSD/External RGB Mux Diagram
OSD/External RGB Mux Resistor Value Table 0.7Vp-p : 0.5Vp-p

"Imagine toggle switch OSD modding a TV in 2019" - maxtherabbit


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 Post subject: Re: TV RGB mod thread
PostPosted: Fri Jun 19, 2020 12:26 am 



Joined: 20 Nov 2019
Posts: 58
Location: Australia
MarkOZLAD wrote:
jeffez wrote:
Just curious what rating cap you would recommend? I found a lower 10-100nF one had negative effects but a much larger 10-100MF seemed ok but probably overkill. So far i have just injected it straight from the luma pin (svideo mod..) as that always worked fine. Is it still best to have the 75R and coupling capacitor even if it's just for sync?


I haven't done this exact mod myself so I don't know for sure but the patterns I tend to notice are 75 ohm termination and 100nF (0.1uF) capacitors. I have seen 1uF and 4.7uF used as well on the Y/External CVBS lines.

I would be consulting datasheets and alternate schematics to see what I could find out for the chip I was modding though.

Cool ok yeah it looks like a 100nF is maybe not letting some frequencies through necessary for sync. The top of the screen gets distorted. I'll look back at the datasheet and see if there's any caps further down the line on the tv. Fair chance i'll see a higher rating one like you say 1-4.7uF
EDIT : Found a 0.47uf


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 Post subject: Re: TV RGB mod thread
PostPosted: Sat Jun 20, 2020 10:40 am 



Joined: 30 Dec 2014
Posts: 515
Im stuck. I can't get any of the menu overlays to show up. I'm getting something but its dark and can barely see...

https://www.youtube.com/watch?v=taPfJ79iCVE

Im pretty much following maxtherabits steps with the exception of using a scart connector. I had to make connections to sync, grounds, audio, and blanking all to the scart pin connector to their points on the board. The only other deviation was using W697 Ys to JUNGLE connecting to both pin 16 on my scart connector and using it to connect to the switch. Which does seem switch between the two modes. Maybe i was suppose to connect W785 Ys from MICON to the scart blanking pin 16? Am I looking at the right direction or am I way off?


Thanks!


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jun 21, 2020 1:02 am 


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Posts: 91
My Toshiba has S-Video which is actually pretty good, not wanting to mess with that (yet) I've moved on. Instead I think I will try modding my Panasonic CT-32G4A since it only has Composite Input which is crappy. Looks like someone has done a similar one here: http://shmups.system11.org/viewtopic.ph ... &start=449

I can't find a schematic for the TV, but I took a look at the chassis. There are the standard 2 ICs that I can see. An AN5166K which is a Jungle IC and a MN1874085 which looks like the OSD chip.

I want to use a VGA connector to connect this to a card using CRT Emudriver/GroovyMAME for 15 kHz arcade games. Instead of using pin 16 on the SCART plug like in the v2 Mux Circuit I thought I could use pin 9 on VGA since it's 5V for blanking. Would this work?


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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jun 22, 2020 5:55 am 



Joined: 30 Dec 2014
Posts: 515
Troubleshooted for a little bit today. Removed the connection from W697 Ys to JUNGLE to pin 16 on the scart connector just to see what would happen and still the same. I can toggle between the different inputs on the TV but thats about it. Volume seems gone and everything still seems like it's too dark. I wonder if maybe I just messed up on the RGB lines on the SCART. Everything looks like on the mux. On the SCART connector I have 75R connected on each rgb pin. Got my ground point for all the pins on the SCART coming from W745 analog ground. And a 390R resistor also on each of the RGB lines. I'm now thinking rgb lines might be messed up. Screen still shows some color but its the most faintest amount and it's all dark. On the plus side, it looks like i got sync right. I know the OSD still works, but it's too dark to see anything.


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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jun 22, 2020 12:25 pm 



Joined: 12 Apr 2020
Posts: 53
Lookes like you don't have blue, and maybe sync is reversed or negative or something. Did you go into a YS pin or something else? Does a normal composite signal look fine on the TV (and what about the menu on composite) if you have blanking turned off.


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 Post subject: Re: TV RGB mod thread
PostPosted: Tue Jun 23, 2020 6:26 am 



Joined: 30 Dec 2014
Posts: 515
flynnsbit wrote:
Lookes like you don't have blue, and maybe sync is reversed or negative or something. Did you go into a YS pin or something else? Does a normal composite signal look fine on the TV (and what about the menu on composite) if you have blanking turned off.


I checked underneath the board and turns out the spot where I removed the 4 resistors connected to the jungle chip, i installed a diode on the Ys blanking line when i was only supposed to install it on the RGB line (check steps 6,7,8 on maxtherabbits post) Removing the diode now gets me some color and I can now see the menu again. I checked all the RGB lines and aside from maybe using a bunch of solder, everything looked fine. Unfortunately, my picture is all blue and sync is off.

Should also note these diodes were giving me some problems installing them. So im not sure if that can have something to do with my issues.

composite input fast blanking off
https://www.youtube.com/watch?v=76T3VxiL_e4

fast blanking on rgb
https://www.youtube.com/watch?v=-1O3LEInO_Y

Also i had tied component video Y as my sync. But moved it all to input 1 composite. Here's how i got it hooked up to the scart pin

Spoiler: show
Image


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jun 24, 2020 11:31 pm 



Joined: 30 Dec 2014
Posts: 515
Haven't been able to make much progress.
Looking at the MarkOZLAD mux diagram, does pin 16 need to be set up the same way as the rgb pins do? that is to say it needs a 75 ohm to ground and another resistor with a wire attached going jungle chip or the micon? Cant pin 16 connect straight to micon or jungle?

I tried a straight connection to both W697 Ys to jungle and W785 Ys from micon to pin 16 with no luck. Sorry to flood this thread but i'm running out of ideas here.


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 25, 2020 1:26 am 



Joined: 11 Jun 2020
Posts: 2
Can an RGB mod be done that bypasses the jungle chip entirely by tapping into its RGB out lines?

I have a TV which I suspect has a bad jungle chip and I thought that might be a good way to test. It wouldn't be permanent.


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 25, 2020 2:13 am 



Joined: 18 May 2017
Posts: 760
tacoguy64 wrote:
Haven't been able to make much progress.
Looking at the MarkOZLAD mux diagram, does pin 16 need to be set up the same way as the rgb pins do? that is to say it needs a 75 ohm to ground and another resistor with a wire attached going jungle chip or the micon? Cant pin 16 connect straight to micon or jungle?

I tried a straight connection to both W697 Ys to jungle and W785 Ys from micon to pin 16 with no luck. Sorry to flood this thread but i'm running out of ideas here.


If you're having trouble with blanking, use a switch or hardwire it until you sort out other issues.

The OSD mux diagram shows how to set up for pin 16 if your jungle blanks at around 1.5V. Essentially you end up mixing the blanking in a very similar manner to the RGB lines.
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MarkOZLAD
OSD/External RGB Mux Diagram
OSD/External RGB Mux Resistor Value Table 0.7Vp-p : 0.5Vp-p

"Imagine toggle switch OSD modding a TV in 2019" - maxtherabbit


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 25, 2020 7:24 am 


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Posts: 295
Location: USA
Has anyone ever designed a PCB to make modding a little easier? I'm thinking something that has pads for R G B and Sync in, pads/holes for the termination and inline resistors, pads for RGB and Sync out, and a spot for 2 resistors to divide 5v into whatever voltage is needed for the blanking pin. Also, maybe a spot for a resistor to lower Sync voltage for people who use extron devices or other devices that output TTL level sync. Preferably it would use SMD resistors for a smaller PCB.

I usually use a stripboard for all the RGB mod components, but this would make the job a bit faster and cleaner.

I have zero experience designing pcbs, but perhaps I should start learning... something this simple shouldn't be too difficult to design, right?


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 25, 2020 5:58 pm 



Joined: 08 May 2018
Posts: 94
Location: Denmark
cyborc wrote:
Has anyone ever designed a PCB to make modding a little easier? I'm thinking something that has pads for R G B and Sync in, pads/holes for the termination and inline resistors, pads for RGB and Sync out, and a spot for 2 resistors to divide 5v into whatever voltage is needed for the blanking pin. Also, maybe a spot for a resistor to lower Sync voltage for people who use extron devices or other devices that output TTL level sync. Preferably it would use SMD resistors for a smaller PCB.

I usually use a stripboard for all the RGB mod components, but this would make the job a bit faster and cleaner.

I have zero experience designing pcbs, but perhaps I should start learning... something this simple shouldn't be too difficult to design, right?


I did this some time ago: https://oshpark.com/shared_projects/JpxJNG1c

Doesn't do everything you mention, but lots of it. It's designed for SCART with audio passthrough, but technically you can just use the pads for further wiring.
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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 25, 2020 7:31 pm 


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Looking at the Datasheet for my jungle I think I have identified the pins I need to use:

Image

https://pdf1.alldatasheet.com/datasheet ... 5165K.html

I won't actually solder sync directly on the chip like that, that was just to identify the pin. I'll probably put it on the composite-in connector.

Now, the blanking and RGB input pins:

Image

Anything standing out here as out of the ordinary?

As for the OSD chip, unfortunately from the datasheet I can't tell which pins are the OSD out:

https://pdf1.alldatasheet.com/datasheet ... 74085.html


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jun 25, 2020 9:17 pm 


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Posts: 295
Location: USA
skum wrote:
cyborc wrote:
Has anyone ever designed a PCB to make modding a little easier? I'm thinking something that has pads for R G B and Sync in, pads/holes for the termination and inline resistors, pads for RGB and Sync out, and a spot for 2 resistors to divide 5v into whatever voltage is needed for the blanking pin. Also, maybe a spot for a resistor to lower Sync voltage for people who use extron devices or other devices that output TTL level sync. Preferably it would use SMD resistors for a smaller PCB.

I usually use a stripboard for all the RGB mod components, but this would make the job a bit faster and cleaner.

I have zero experience designing pcbs, but perhaps I should start learning... something this simple shouldn't be too difficult to design, right?


I did this some time ago: https://oshpark.com/shared_projects/JpxJNG1c

Doesn't do everything you mention, but lots of it. It's designed for SCART with audio passthrough, but technically you can just use the pads for further wiring.


Awesome, thanks! I normally use HD15 or BNC but I can certainly adapt this to those connectors.


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 Post subject: Re: TV RGB mod thread
PostPosted: Fri Jun 26, 2020 1:05 am 



Joined: 18 May 2017
Posts: 760
tomato16 wrote:
Hi there, also a long time lurker of this forum. There is vast amount of information here, I appreciate you all for sharing your knowledge and work.

I am planning to RGB mod my Sony KV-20S10. I was hoping someone could review my steps in case I'm missing anything.

Details
    Jungle IC contains unused analog R,G,B IN pins, (16, 17, 18)
    Jungle is likely CXA1465AS or CXA1464AS, will confirm when set is opened
    will be using D-SUB 15 female connector, connecting to MiSTer only

Steps
    wire CSYNC IN -> Jungle pin 5 (C)
    wire R IN -> 25 ohm resistor, ground, 1uf capacitor -> Jungle pin 16 (R)
    wire G IN -> 25 ohm resistor, ground, 1uf capacitor -> Jungle pin 17 (G)
    wire B IN -> 25 ohm resistor, ground, 1uf capacitor -> Jungle pin 18 (B)
    wire SET5V -> rocker switch -> 100 ohm resistor -> Jungle pin 15 (YS)
    Disable VM via service menu
    If RGB analog pins turn out to be disabled, set everything on the ID side of the service menu to 1, reset the service menu with 8 + enter (thank you fandangos)

Questions
    Is it okay to solder to the legs of Jungle IC without lifting them?
    Is it safe to connect CSYNC IN to the Jungle without any resistance?
    How could I tell if my analog RGB pins have been disabled?

I collected my info from mods done by pcbjunkie, suprcrackers, GoXoD and fandangos. Thank you all for posting your work on this forum, it has been very helpful.






    wire G IN -> 25 ohm resistor, ground, 1uf capacitor -> Jungle pin 17 (G)

Not sure why you've chosen 25 Ohm resistor. Should be 75 Ohm. For the capacitor the datasheet of the CXA1465AS there are multiple values shown in the wiring diagrams. 0.22uF on the test circuit and 10uF on page 36... I'd go with 0.1uF.


    Is it safe to connect CSYNC IN to the Jungle without any resistance?

I'd normally say put the sync into the AV port - even if this means soldering to the points underneath it, but it seems this is RF only right? Hmmmm....

Jungle pin 3 is the video/sync input as far as I can tell. I'd be looking to lift the leg of C304 farthest from the jungle and inject my sync into it. As you want to use VGA csync I would be sending the csync into a 1000 Ohm resistor and then adding a 75 Ohm to ground and then into the leg of C304. This will attenuate the CSYNC to a level the TV expects.

    wire SET5V -> rocker switch -> 100 ohm resistor -> Jungle pin 15 (YS)

I'd send 5V to a switch and then through a 470 Ohm resistor into the leg of L001 thats closest to IC101.

    Is it okay to solder to the legs of Jungle IC without lifting them?

I've never lifted a chip leg to mod a set. Take some detailed photos of the top and bottom of the chassis circuits. You might find a better way. However....If the legs are just left floating, not grounded you should be ok to solder to them. The schematic suggests they are all linked to a 10K and then ground (R325), this may need to be removed to leave them floating.

EDIT: Looking a bit closer at the schematic, you may need to lift the RGB legs. Possibly better to just snip them near the circuit board.
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OSD/External RGB Mux Diagram
OSD/External RGB Mux Resistor Value Table 0.7Vp-p : 0.5Vp-p

"Imagine toggle switch OSD modding a TV in 2019" - maxtherabbit


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jun 28, 2020 4:47 am 


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I assume AC (Pulse) for the RGB inputs means PWM which is actually digital and won't work?


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jun 28, 2020 7:09 pm 



Joined: 23 Jun 2020
Posts: 2
flynnsbit wrote:
Samsung GXE1395 ( GXE-1395 ) (GXE139(S RGB mod completed. It's the same chassis as David (8-bit guy) so if you follow his video you should be good. I just changed it a bit and used the existing "monitor out" RCA jacks for RGB in. I snipped them from the board and soldered onto them and then added the blanking button to the top.

75ohm resistor triangle installed on R944, R945, R946. Bridge R948 to fix brightness problem coming from CC, added a NO/NC switch button. 5v in from i2c pin header on board, then I pulled up the closest side of R918 for blanking. 5v is only supplied to one side when button is on.

Image
Image
Image
Image
Image
Image
Image
Image
Image

Album:https://klovimg.com/album/m669

Hope it helps someone in the future. The 8-bit videos are a great walkthrough.



Flynnsbit, I'm trying to the the same RGB mod to my GXTV that you've done but I'm confused on a couple things. Firstly, are you grounding your 3 signal wires? If so, are you using the ground near where you got the 5v? If so, is it necessary to use 3 ground wires like 8 Bit Guy did, or can I just run 1 wire to all 3 signal ports?
I'm also confused about the 3 wires on your switch. The red wire is the 5v which I presume you split from the red wire going into the R918 hole? The black I presume is the ground taken from the area I mentioned above? Is it a second ground wire because the first is for the signal ports? I have no idea where the blue wire is coming from. Is that the wire that I've attached to the R918 resister?

EDIT: Nevermind, it took so long to get this post approved that I've been able to figure this out on my own. Here are some pictures of my final work:

Image

Image

Image

Image

I had purchased this TV in 1997 on Long Island, NY when it was released, and I was always so disappointing that a TV advertised as a "Television For Gamers" only had composite video. I even went into the Electronic Boutique in the Sunrise Mall in Massapequa, NY the next day and complained that it didn't even support S-Video (TV was $300 at the time, I believe), and the old man working there was shocked (they had a display GXTV in the store). I had barely any money at the time, but I won a Stereo Speaker Set from PlayStation through a random drawing from PlayStation Underground Magazine. I immediately sold it for the purchase price of a GXTV so I could buy one, which I did.
I still loved the set though, for it had awesome sound, 2 composite inputs, 2 RF inputs and even composite video/audio out for displaying to a 2nd TV simultaneously. Not to mention the cool opening/closing speakers and large woofer on the top.
It's taken 23 years, but this television is finally worthy of it's name and slogan.


Last edited by Virtual Davey on Sat Jul 04, 2020 11:37 pm, edited 4 times in total.

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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jun 28, 2020 11:57 pm 



Joined: 18 May 2017
Posts: 760
Osirus wrote:
I assume AC (Pulse) for the RGB inputs means PWM which is actually digital and won't work?


The Datasheet is a little confusing, I can't tell you whether it will work or not. Could just give it a shot.
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MarkOZLAD
OSD/External RGB Mux Diagram
OSD/External RGB Mux Resistor Value Table 0.7Vp-p : 0.5Vp-p

"Imagine toggle switch OSD modding a TV in 2019" - maxtherabbit


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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jul 06, 2020 7:54 pm 


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Looking bad. Found a (fuzzy) schematic of the chassis. OSD RGB output from the microcontroller (42, 43, 44) say 0 - 5V DC and there are what appears to be AC coupling capacitors connected to ground on the lines (C036, C037, C038). :(

http://www.planetatecnico.com/foro/down ... p?id=11955


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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jul 06, 2020 8:14 pm 



Joined: 11 Jun 2020
Posts: 4
Oneinchbiceps wrote:
abispac wrote:
So my niece gave me a 19 ich tv its a curtis matches tronics model cm19022s, i could not locate a service manual, it has two chips, a toshiba ta1282n and a zilog 5007 or szm-370th1, i couldnt find information on the zilog chip , but the toshiba i got the pdf datasheet and a gif image Image
https://datasheetspdf.com/pdf-file/4929 ... /TA1268N/1

Now according to the datasheet and the image, 14 its my blank signal, 15,16,17 are rgb, so it should be a straight mode right?
Image Image Image Image

So I just realise i have the same chassis as the 8bit guy, the same, it might be a little bit more modern but its the same ---smurfing--- one, so all i got to do to succeed its just straight copy his mod ,but i did the mod, exactly as the 8bit guy did, i also had no smoke coming up after getting everything together again, ill just need to test it with groovymame,So i can say im almost done with this mode, i just cant figureout what im missing. I did everything exactly as the 8bit guy did, well, not the fancy conector, as i might add it later on. Hook my pc with my vga brekout cable, and bam, clear colors but bad sync
Image
So i started emudrivers on my other tv (i had both monitors hooked, i always do that on crtdrivers) and dont matter what settings i choose, 15khz, 31khz o 60 khz, i cant get this thing to sync. i can still see that colors are gonna be good, i ust need a bit of help in here please. So so far, as the 8bit guy did, the rgb cables have the 75ohm resistors terminated to ground, all grounds go to ground, i get the 5v volts from the same place, and the sync i try to get it from the yellow rca entrance on the back of the tv. but no luck. Do i need to add a 75ohn resistor on the sync cable as well? or do i need to build the vga cable has he did on his second video? thanks for any help.
This is how far i got.
Image

and a link to the second video where he builds the vga cable.

https://www.youtube.com/watch?v=NkpSBK3g-gA&feature=share


I also have this model and I was thinking about modding it. Funny thing is I took the TV back off tonight to see what kind of chips I had. Anyhow I've notice the AV connector on my television making poor connection so I made sure to re flow the solder on the AV portion before putting the back back on the TV. To be honest though I don't think I had cold solder points upon inspection I got a funny feeling it's yellow jack itself that probably bad. Try wiggling that yellow cable to see if that fixes your sync issue. We should keep in touch seeing how were attempting to mod the same set.


Just an update to my current issue.

I finished the mod but I'm having issues. When I flip the switch to put 5v to blanking to force blanking, on the on screen display to insert input into AV port goes away but it doesn't switch to RGB it stays on composite. I know it isn't RGB cause I remove R G B lines from BNC jacks with no change to the picture. So the RGB isn't being injected into the circuit. I used a Genesis 1 cable connected through scart to a scart into BNC cable. Wondering if I should of changed the caps going into the processor but something wrong though not sure what it might be. Any help would be great.


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jul 08, 2020 7:43 am 



Joined: 11 Jun 2020
Posts: 4
Sorry for the double post. After more testing I've notice the picture inside the menu potion is RGB. Whenever I have the text up I can see it cause I remove Red plug and picture color does change inside the text. So RGB is there just that it seem's that the sync and composite is the issue. If I have Composite hooked up for the Sync the TV chooses to do composite over RGB even when I force 5 volts into the blanking by flipping the switch it still chooses composite over RGB.

I have Sync soldered to the bottom of the composite jack. I was thinking maybe if there was another place I could steal the sync from and not be mixed with composite video maybe it'll work with just RGB? Any suggestions? Am I doing something wrong?

***Edit***

Alright two hours later. I figured it out. I had the switch for the Blanking circuit wired wrong. Had 5 volts going to micro controller rather then the Jungle Chip blanking. Switch the two wires on the switch the right way and it's working now. Looks great, although I was under the impression the menu display wouldn't work but it does. The color and brightness controls doesn't work in RGB mode but the display still show's up when you hit the menu button. So happy, hope this info helps anyone on this set.

Curtis Mathis CM 19022S Manufactured August 2001
Same as the 8 bit guy video only difference was the location of the resistor for the blanking circuit coming off micro controller seen in video 2 on 8 bit guy channel on this subject.

One last thing I did have to add a plug to the video port to get the insert plug notice on screen to go away. Not sure how it knows the plug is empty when I tapped into the signal from the same pad for the sync. Oh well that's fine by me.


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jul 08, 2020 9:41 pm 



Joined: 26 Jun 2020
Posts: 1
Hello,

I'm trying to RGB mod an Emerson EWC27T4 that my s/o brought home on a whim. If I were to attempt the 8bit guy triangles approach would I choose resistors based off the 3.3k R253,251,249 or off the 1.5k R254,R252,R250 (which I'm assuming is where the triangle takes place) seen below:
Spoiler: show
Image


looking at the table in MarkOZLAD's signature, would I be shooting for 470ohm resistors or 180ohm?

I wish I had the ability to search within the thread on the forum as I'm sure that my answer and more lies in the 106 pages.

Thanks folks!


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 Post subject: Re: TV RGB mod thread
PostPosted: Fri Jul 10, 2020 11:01 pm 



Joined: 10 Jul 2020
Posts: 1
lolitsevan wrote:
On a more interesting note, i picked up a little 9" sony kv-9pt50, and while I was looking at the datasheet for the JIC, I noticed it not only has digital inputs for RGB, but separate H and V sync, so I was wondering if this monitor would then be capable of CGA/15k VGA? 9" isn't really enough real estate to play on for me so I'm just looking to do something interesting with this one, the standard mod seems easy enough, just might have to try a few different voltage sources and I'm not sure which analog blanking pin I'm supposed to use, but I'm really interested in the digital RGB stuff.

Datasheet for the kv-9pt50 jungle ic here


Sorry for bringing back such an old comment, but I just picked up a Sony KV-9PT50 at goodwill for a mere $5 and was wondering if you ever got around doing an RGB mod on yours?


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 Post subject: Re: TV RGB mod thread
PostPosted: Sat Jul 11, 2020 2:41 am 



Joined: 18 May 2017
Posts: 760
Oneinchbiceps wrote:
I was under the impression the menu display wouldn't work but it does.


You didn't think I'd teach Dave some shithouse OSD snip method did you? Of course the OSD works, pay attention man!

Here's the thread that details the 8 Bit Guy CRT RGB mod. Don't know how you missed it, it's linked in the video description.
_________________
___________________________________________________
MarkOZLAD
OSD/External RGB Mux Diagram
OSD/External RGB Mux Resistor Value Table 0.7Vp-p : 0.5Vp-p

"Imagine toggle switch OSD modding a TV in 2019" - maxtherabbit


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 Post subject: Re: TV RGB mod thread
PostPosted: Sat Jul 11, 2020 1:16 pm 



Joined: 11 Jun 2020
Posts: 4
MarkOZLAD wrote:
Oneinchbiceps wrote:
I was under the impression the menu display wouldn't work but it does.


You didn't think I'd teach Dave some shithouse OSD snip method did you? Of course the OSD works, pay attention man!

Here's the thread that details the 8 Bit Guy CRT RGB mod. Don't know how you missed it, it's linked in the video description.


I guess it pays to read sorry my bad. Thanks for all the work you do on this mod helped a lot of people out, like myself.


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