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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jan 13, 2019 1:22 pm 



Joined: 14 Nov 2018
Posts: 87
retromaniak wrote:
HellRazor wrote:
9 inch "portable" consumer sets adds a bit of sharpness to the image overall as i can see here, and not all people get used to play on such small sets. Someone also pointed many of that sets cant be modded at all even having analog input due to some jungle ic restrictions, i not kindda sure of that


I am aware that on such TVs the picture seems to be fuzzy because I myself play games with PS1 on a 5 inch Orion CTV-5. I mean, is the difference in the image between the ordinary "portable" TV and PVM will be so big that it would be worth paying for PVM 100-200 dollars more?


i dont think it worths (just my opinion)


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jan 13, 2019 5:05 pm 



Joined: 26 Dec 2018
Posts: 26
HellRazor wrote:
retromaniak wrote:
HellRazor wrote:
9 inch "portable" consumer sets adds a bit of sharpness to the image overall as i can see here, and not all people get used to play on such small sets. Someone also pointed many of that sets cant be modded at all even having analog input due to some jungle ic restrictions, i not kindda sure of that


I am aware that on such TVs the picture seems to be fuzzy because I myself play games with PS1 on a 5 inch Orion CTV-5. I mean, is the difference in the image between the ordinary "portable" TV and PVM will be so big that it would be worth paying for PVM 100-200 dollars more?


i dont think it worths (just my opinion)

Thank you for your help.


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jan 13, 2019 10:02 pm 



Joined: 18 May 2017
Posts: 603
Seikenfreak wrote:

I'd need to know in more detail exactly how you've got it laid out


For the RGB wires, at the scart end, I connect the signal wires to the pins 7, 11 and 15. I connect the colour shields to pins 5,9 an 13. I also connect the large outer shield to pin 21. At the chassis end I twist all three colour shields to each other, as well as the main outer shield, and then connect a single wire to them to go to ground.

I do not remove the wires from the larger outer case/shielding, instead I just cut enough outer plastic casing to expose the wires I need. This keeps everything tidy.

For sync and audio I run RCA separately from the scart to wherever they are needed. I generally break these out to externally mounted RCA ports so that the user can choose where they run sync to.

If at all possible I use the thin wires in the VGA cable to do the blanking. Mostly from the switch to the blanking. My wire running from 5V to the switch will generally be separate but not always. A lot of the Sony sets I work on have a voltage from a pin on the Text header that can be sent up the VGA cable to the switch and then back down the VGA cable via a different wire into the blanking pin.

As I said before, it helps when the placement of the RGB injection points are aligned with something you can put a header on.
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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 Jan 13, 2019 10:20 pm 



Joined: 30 Jul 2017
Posts: 49
MarkOZLAD wrote:
For the RGB wires, at the scart end, I connect the signal wires to the pins 7, 11 and 15. I connect the colour shields to pins 5,9 an 13. I also connect the large outer shield to pin 21. At the chassis end I twist all three colour shields to each other, as well as the main outer shield, and then connect a single wire to them to go to ground.

I do not remove the wires from the larger outer case/shielding, instead I just cut enough outer plastic casing to expose the wires I need. This keeps everything tidy.

For sync and audio I run RCA separately from the scart to wherever they are needed. I generally break these out to externally mounted RCA ports so that the user can choose where they run sync to.

If at all possible I use the thin wires in the VGA cable to do the blanking. Mostly from the switch to the blanking. My wire running from 5V to the switch will generally be separate but not always. A lot of the Sony sets I work on have a voltage from a pin on the Text header that can be sent up the VGA cable to the switch and then back down the VGA cable via a different wire into the blanking pin.

As I said before, it helps when the placement of the RGB injection points are aligned with something you can put a header on.


Alright, this doesn't sound too far off what I was doing. Minus the switch stuff. I think I'll give it another go, maybe next weekend. Thanks for clarifying it.


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jan 13, 2019 10:30 pm 


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MarkOZLAD wrote:
Seikenfreak wrote:
At the chassis end I twist all three colour shields to each other, as well as the main outer shield, and then connect a single wire to them to go to ground.


Provided the drain wire is connected to ground at some point, any electrical noise absorbed by the shield will makes its way to ground. Will make life easier at the jungle end of your hookup.

Working with mini-coxial video cables is pretty torturous. It's takes practise and dexterity to get things really neat. Having the right tools (i.e. high-quality side cutters, cable strippers, heat gun for heat shrink, etc.) goes a long way too.

Here's an attempt I made at working with shielded video cables when I first started out.

Would be a lot faster and neater with all the little tools I have since acquired...
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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jan 14, 2019 5:14 pm 



Joined: 14 Nov 2018
Posts: 87
Paradroid wrote:
MarkOZLAD wrote:
Seikenfreak wrote:
At the chassis end I twist all three colour shields to each other, as well as the main outer shield, and then connect a single wire to them to go to ground.


Provided the drain wire is connected to ground at some point, any electrical noise absorbed by the shield will makes its way to ground. Will make life easier at the jungle end of your hookup.

Working with mini-coxial video cables is pretty torturous. It's takes practise and dexterity to get things really neat. Having the right tools (i.e. high-quality side cutters, cable strippers, heat gun for heat shrink, etc.) goes a long way too.

Here's an attempt I made at working with shielded video cables when I first started out.

Would be a lot faster and neater with all the little tools I have since acquired...


Theres a link for that composite sync circuit board? i know its pretty basic but i get curious to know what transistor is that on the pics


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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jan 14, 2019 8:08 pm 


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HellRazor wrote:
Theres a link for that composite sync circuit board? i know its pretty basic but i get curious to know what transistor is that on the pics

Nah... you're not really. ;) This is a much better way to go. I have a Veroboard layout for that sync combiner... I'll try dig it out.

Fortunately, since the CRT Emudriver now supports composite sync, we don't have to build sync combiners or buy Extrons or UMSAs. Much easier to interface a PC with an RGB mod (just a voltage divider to cut down the sync level).
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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jan 14, 2019 8:47 pm 



Joined: 14 Nov 2018
Posts: 87
Paradroid wrote:
HellRazor wrote:
Theres a link for that composite sync circuit board? i know its pretty basic but i get curious to know what transistor is that on the pics

Nah... you're not really. ;) This is a much better way to go. I have a Veroboard layout for that sync combiner... I'll try dig it out.

Fortunately, since the CRT Emudriver now supports composite sync, we don't have to build sync combiners or buy Extrons or UMSAs. Much easier to interface a PC with an RGB mod (just a voltage divider to cut down the sync level).


oh thats great thanks!


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 Post subject: Re: TV RGB mod thread
PostPosted: Mon Jan 21, 2019 9:09 pm 


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I need some help with this set, not sure if it would be possible to RGB mod or not.

KV-29FA350 Service Manual page 34 for the IC diagram
TDA12019H datasheet page 6 for the IC family differences and page 18 for the inputs

This TV was made in 2007, the chassis is BX-1L, it has a single IC, however this IC mentions RGB and SCART; from IC datasheet the component/YPbPr in lines are displayed as R / Pr input.

This IC is bigger and includes FM radio, internally it has 2 chroma inputs, any help in determining if this set can be RGB modded would be really appreciated.


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 Post subject: Re: TV RGB mod thread
PostPosted: Tue Jan 22, 2019 3:15 am 



Joined: 18 May 2017
Posts: 603
Aleyr wrote:
I need some help with this set, not sure if it would be possible to RGB mod or not.

KV-29FA350 Service Manual page 34 for the IC diagram
TDA12019H datasheet page 6 for the IC family differences and page 18 for the inputs

This TV was made in 2007, the chassis is BX-1L, it has a single IC, however this IC mentions RGB and SCART; from IC datasheet the component/YPbPr in lines are displayed as R / Pr input.

This IC is bigger and includes FM radio, internally it has 2 chroma inputs, any help in determining if this set can be RGB modded would be really appreciated.


I, and two other people I know, have tried and failed to get this chassis to work. As far as I can tell the RGB inputs are locked out in the chip's registers and I couldn't find a service setting to enable them. If it doesn't already have Component/S-Video you may be able to enable them.

This option can turn on the Component Mode. Would need to add the necessary electronic components to make it work.

Image

The Scart option mentioned there was ineffective in my experimentation. It's enabled anyway.
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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: Tue Jan 22, 2019 5:02 am 


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Hi everyone, greetings from Argentina!

I have been following this thread with great interest for a long time.
I failed to do this mod on 3 CRTs :cry: , but last weekend I succeeded with one.

So, I wanted to share with you guys the details of the mod, so you can put them on the list of the first post.

TV: 21" Sony Trinitron model KV-21XTR3
Jungle chip: CXA1871S
Datasheet: https://pdf1.alldatasheet.es/datasheet- ... 1871S.html

Datasheet info I've used:
Spoiler: show
Image

Page 30:
Image

I forgot to put the blanking signal with a 220R, but it works the same...


Pin 14 is for blanking. pins 15, 16 and 17 are for Red Green and Blue.

I got lucky with this TV, because the board has a place where you can hook the R, G, B and blanking signals. No need to cut or lift the jungle chip pins.

Board front:
Spoiler: show
Image


Back:
Spoiler: show
Image


I highlighted the places where I soldered the wires and where I saw the board prints that helped me pinpointing the right place to solder.
Besides the four signals I mentioned before, I also have the GND signal in that section. On the board front image, in the upper left corner, there is the 5v cable.

I took the Sync signal from the composite video. And I also took the audio Left and Right signals.

Spoiler: show
Image


As stated in the datasheet, the RGB signals must have 220R. I did not have that value, so I put 3 75R in line.

Spoiler: show
Image


I soldered all those TV signals to a female DB9 connector, which I use to connect to my RGB cables.
I did that because I can have a DB9 cable "hanging" in front of the TV and I can use it to hook any console, without having to unplug and plug the SCART connector.

Spoiler: show
Image


Next to the DB9 connector there is a switch that I use to activate the mod, sending 5v to the blanking signal.

In summary, these are the signals I took from the TV:
- Blanking (pin 14)
- Red (pin 15) with 220R
- Green (pin 16) with 220R
- Blue (pin 17) wiwh 220R
- GN
- 5v
- Composite Video
- Audio L
- Audio R

The blanking signal can either be hooked to the 5v cable, for an "always on" mod, or you can put both signals to a switch.

I see you guys have less trouble than me finding a female SCART connector.

I used to have a Philips Matchline TV with a SCART connector on the back and making this SCART-to-DB9 cable, made the lazy side of me easier to connect different consoles.

This is the pinout I used to have:
Spoiler: show
Image


These are the results:
Spoiler: show
Image

Image

Image

Image


(this guide is sort of a copy paste of the guide I put in another forum where some guys and I have been struggling to perform this input hack)

I want to thank mikejmoffitt for the explaining the mod and everyone who is keeping this thread alive.

I am no expert but if anyone needs a hand with the guid or if something is not clear, I can help.

I hope to get a 29" JVC CRT fixed, so I can continue modding that TV. It has a TB1230N jungle chip and I was not able to find information regarding the mod or to find how to do it myself (I think I broke the jungle chip when performing experiments)


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jan 23, 2019 1:37 am 


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Posts: 7
MarkOZLAD wrote:
Aleyr wrote:
I need some help with this set, not sure if it would be possible to RGB mod or not.

KV-29FA350 Service Manual page 34 for the IC diagram
TDA12019H datasheet page 6 for the IC family differences and page 18 for the inputs

This TV was made in 2007, the chassis is BX-1L, it has a single IC, however this IC mentions RGB and SCART; from IC datasheet the component/YPbPr in lines are displayed as R / Pr input.

This IC is bigger and includes FM radio, internally it has 2 chroma inputs, any help in determining if this set can be RGB modded would be really appreciated.


I, and two other people I know, have tried and failed to get this chassis to work. As far as I can tell the RGB inputs are locked out in the chip's registers and I couldn't find a service setting to enable them. If it doesn't already have Component/S-Video you may be able to enable them.

This option can turn on the Component Mode. Would need to add the necessary electronic components to make it work.

Image

The Scart option mentioned there was ineffective in my experimentation. It's enabled anyway.


Thanks MarkOZLAD, looks like it'll need something to modify the register on the fly, saw someone do this on Youtube.


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jan 23, 2019 2:54 am 



Joined: 18 May 2017
Posts: 603
Aleyr wrote:
Thanks MarkOZLAD, looks like it'll need something to modify the register on the fly, saw someone do this on Youtube.


No, this can be changed permanently in the service menu. Just need to edit the Option Byte OPB2 and change the Hex value so that bit 6 is a 1.

Grab the service manual for the Sony KV-AR21M30 from elektrotanya and it should show you almost all you need.
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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: Wed Jan 23, 2019 3:39 am 



Joined: 18 May 2017
Posts: 603
Rodri3 wrote:
Hi everyone, greetings from Argentina!

I have been following this thread with great interest for a long time.
I failed to do this mod on 3 CRTs :cry: , but last weekend I succeeded with one.

So, I wanted to share with you guys the details of the mod, so you can put them on the list of the first post.

TV: 21" Sony Trinitron model KV-21XTR3
Jungle chip: CXA1871S
Datasheet: https://pdf1.alldatasheet.es/datasheet- ... 1871S.html

Datasheet info I've used:
[spoiler]Image

Page 30:
Image



So this jungle can accept Analog RGB? Wow! I know a few people who are going to be happy about that.
_________________
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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: Wed Jan 23, 2019 4:32 am 


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MarkOZLAD wrote:
So this jungle can accept Analog RGB? Wow! I know a few people who are going to be happy about that.


Now that you mention it, I did connect the RGB signals to the digital RGB pinouts...
But it works!

Let me know if someone else succeeds!


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jan 23, 2019 3:52 pm 



Joined: 06 Nov 2018
Posts: 47
mgerety wrote:
mgerety wrote:
Need Help with New Mod: Sharp 25r-s100 Chassis SN-010

Service manual: https://elektrotanya.com/sharp_27r-s50_ ... nload.html

I've traced the R, G, B, and Blanking lines from the IC201 (jungle) IX3354CENI
Pin 14 - R
pin 15 - G
pin 16 - B
pin 17 - BLK

to the IC2001 (System COntrol) IX3492CE:
Pin 18 - R
Pin 19 - G
Pin 20 - B
Pin 21 - BLK

Each line passes through a 6.8K 1/8 W resistor (R2024 - R2027, topside, not surface mount) with a cap tied to ground (C2021-2024 which (yay) aren't listed in the components list.).

That's the only thing between htem, and no topside jumpers to tie into (boo).

Where should I tap in, should I remove any of the existing resistors, and what values should I use for the blanking and the feedback. Any help would be appreciated!


EDIT: Note: I want to do the OSD MUX.


I've attempted to figure this out on my own, but I'm still not sure what I should be doing. Any assistance would be appreciated.



Did I fill this out right? Am I targeting .7V on the RGB output? If so, should i go with 1.1K ohm resistors for the Ext RGB inline? That puts me at ~0.73V

Image


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jan 23, 2019 8:34 pm 


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Location: Columbus, OH
Hi Everyone,

This thread has been super helpful, I have a couple of questions before I begin my first mod.

I am going to mod a Sony KV-27V42. MarkOZLAD posted a very detailed explanation of the KV-27S42, so I'm following these steps and instructions for my project, as the models are nearly identical. I have a few questions I want to iron out before I begin:

- As far as I can tell in looking at the two service manuals, all of the relevant schematics to this are exactly the same between 27S42 and 27V42. I just wanted to double check in case someone else more knowledgeable sees anything I should worry about. They use nearly identical chassis and boards internally. I plan on using the same calculations as the post about the 27S42.

https://www.manualslib.com/manual/74459 ... 27v42.html
https://www.manualslib.com/manual/15968 ... 27s42.html

- I am using a SCART cable instead of BNC. In the example in the post above about the 27S42, sync was accomplished via an S-Video to Composite adapter. I'd assume I connect SCART PIN 19 to the sync pin 4 on the S-Video port as mentioned in post 1 of this thread. Looking at the schematic it looks like the side of R275 nearest the S-Video port might be the best place to do this. Just wanted to confirm in case someone had a better idea for that.

- 5V is supposed to be connected to EEPROM Leg 8. Am I correct in identifying this as PIN 8 on IC521 NJM2903M-TE2 in the schematic? If not, where is this located?

- What function does the switch serve in this method of the mod. I was under the impression that earlier in the thread how it's described, the switch let you select either OSD or RGB external (and not both at the same time). In the sample screenshots on the KV-27S42 post above, the OSD is visible while the RGB from the external source is visible. Does the switch simply turn the OSD on and off?


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 Post subject: Re: TV RGB mod thread
PostPosted: Wed Jan 23, 2019 10:03 pm 



Joined: 18 May 2017
Posts: 603
LuckyDay wrote:
- I am using a SCART cable instead of BNC. In the example in the post above about the 27S42, sync was accomplished via an S-Video to Composite adapter. I'd assume I connect SCART PIN 19 to the sync pin 4 on the S-Video port as mentioned in post 1 of this thread. Looking at the schematic it looks like the side of R275 nearest the S-Video port might be the best place to do this. Just wanted to confirm in case someone had a better idea for that.

- 5V is supposed to be connected to EEPROM Leg 8. Am I correct in identifying this as PIN 8 on IC521 NJM2903M-TE2 in the schematic? If not, where is this located?

- What function does the switch serve in this method of the mod. I was under the impression that earlier in the thread how it's described, the switch let you select either OSD or RGB external (and not both at the same time). In the sample screenshots on the KV-27S42 post above, the OSD is visible while the RGB from the external source is visible. Does the switch simply turn the OSD on and off?


If you connect to S-Video by soldering wires onto the underside you will have to find a way to trigger the TV into S-Video mode. The TV can sense whether S-Video has been inserted. You could insert an S-Video cable to trgger.

5V can come from anywhere on the 5V rails of the TV. EEPROM leg 8 is just one place to get it. My instructions normally detail where to grab it. NJM2903M-TE2 appears to be a voltage comparator, not an EEPROM. That doesn't preclude it from being a valid 5V source though.

The switch allows for RGB blanking to be turned off. Please read the Wikipedia article about scart to understand fast blanking. The switch will make fast blanking be always on.

The OSD Mux method I document for your set allows for OSD to be visible when in RGB mode. Please disregard the obsolete first post of this thread.
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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: Wed Jan 23, 2019 11:12 pm 


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Location: Columbus, OH
thanks. One more follow up question.

Are 1/4W resistors sufficient for this project? I only ask because I have a lot on hand already I could use. I suspect maybe for longevity and safety the 1/2 may be a better idea.


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jan 24, 2019 1:56 am 



Joined: 14 Nov 2018
Posts: 87
Hi guys , after some days busy i finally get time back to work on my 14 set, i have some doubt here that i need to confirm as these are smd resistors and i dont want to destroy the tv by doing the wrong thing. So as Syntax instructs me i need to replace those 0R bridge resistors with some 100n caps, my doubt is i need to replace just the R,G,B (R320, R321,R322) ones or also the blank YS (R319) one? heres the pic
Image

i Also found CN101 have very convenient board/place to solder the external lines 5V and all, the problem is it get very near to the power supply board so im expecting for some interference and a good shield work here:
Image
Image
Image

the complete diagram again: https://klovimg.com/image/PW5aZ


Last edited by HellRazor on Thu Jan 24, 2019 2:25 am, edited 2 times in total.

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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jan 24, 2019 2:19 am 



Joined: 14 Nov 2018
Posts: 87
LuckyDay wrote:
thanks. One more follow up question.

Are 1/4W resistors sufficient for this project? I only ask because I have a lot on hand already I could use. I suspect maybe for longevity and safety the 1/2 may be a better idea.

you gonna be fine i use 1/4 for the two sets that i mod


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 Post subject: Re: TV RGB mod thread
PostPosted: Thu Jan 24, 2019 3:06 am 



Joined: 18 May 2017
Posts: 603
HellRazor wrote:
LuckyDay wrote:
thanks. One more follow up question.

Are 1/4W resistors sufficient for this project? I only ask because I have a lot on hand already I could use. I suspect maybe for longevity and safety the 1/2 may be a better idea.

you gonna be fine i use 1/4 for the two sets that i mod


Yes, a set I'm currently looking at is using 1/8W for all resistors on the RGB and Blanking lines so that should be a good indication.
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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 Jan 24, 2019 5:08 am 



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Posts: 603
mgerety wrote:
Did I fill this out right? Am I targeting .7V on the RGB output? If so, should i go with 1.1K ohm resistors for the Ext RGB inline? That puts me at ~0.73V


Yes.

Image
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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: Fri Jan 25, 2019 6:36 am 


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Location: Columbus, OH
So tonight I finished up the first attempt at the Sony KV-27V42.

I don't want to say I failed entirely, but I missed the mark on something. What I appear to have done here is add a working SCART composite port to this TV.

Instead of my original idea to use PIN 3 of the S-Video as the sync, I decided to use the Video 1 Composite spot on the board to keep things more in line with what the guide in the post on the previous page describes (and because it was mentioned that for this to work, I'd have to plug an S-Video cable in for things to work).

I wired this to SCART PIN 20. That's Composite Input on the female SCART port, and I realized after starting everything up and assembling. So I'm feeding composite video through SCART to Input 1 on the TV.

So what I've got is a working set, looks like a junky regular composite image (certainly nowhere near RGB). OSD works perfectly fine as well. I am unable to determine if the toggle switch has an effect on anything (I have a bit of noise and static on other inputs, seems to be present toggled either way).

Here's what is currently wired on my SCART, maybe I'm close and just off by a specific pin or two:

SCART 2 - Audio R
SCART 4 - Audio G
SCART 6 - Audio L
SCART 7 - Blue
SCART 11 - Green
SCART 15 - Red
SCART 20 - Composite Video 1 internally on system (This needs to be 16 perhaps?)


Am I correct in thinking I incorrectly wired 20 into what should have been 16? I'm considering this a near victory, as I didn't mangle a set and prevent it from working on my first attempt. I still have sound, OSD, video, and all other working inputs. I think I'm close to where I need to be.


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 Post subject: Re: TV RGB mod thread
PostPosted: Fri Jan 25, 2019 8:17 am 



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Posts: 603
Scart pin 20 going to the composite input of the Tv Is correct. Pin 16 carries the blanking voltage which you likely won’t need if you are using a switch.
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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: Fri Jan 25, 2019 3:27 pm 


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Location: Columbus, OH
Hmm, so I have some things to figure out then.

My image looks terrible, and has streaking/rainbow effects on lots of it. The image itself doesn't have any definition I'd expect from RGB, it looks like straight Composite in quality. The fourth pic below has an area circled that has the rainbow stripes that are appearing in a lot of screens.

Image
Image
Image
Image

I'm using the 1000R/100R option shown in the calculator in the guide for the set in the post above. No diodes. I can go back through and check every connection tonight to make sure nothing is off. If the diodes and different resistor values may make a difference in quality and reducing noise and all of this bloom/artifacts I can give that a try. There's also a lot of dot crawl around the edges of items, which is why it seems like it's comparable to composite.

I'll also check to make sure that the grounds on all of the SCART pins for RGB have continuity and are wired correctly.

*Should be noted that the set through other imports before this mod didn't have any of these issues and the image quality was much better via composite just through the front panel.

** Additional thought. I wonder if I was a little careless on wire management and routing in this, and maybe a lot of these problems above are coming from interference somewhere else on the board (HV sources nearby maybe). If nobody else here has any specific tips to try to resolve the problems I'm seeing, I may rethink and redo some of this and be more careful with how clean I've wired this.

Does anyone have suggestions on how to shield the RGB wiring in these projects, and is this necessary? Does cable length contribute to noise and interference in something like this? I have both copper and aluminum tape, so I can shield things properly if needed.


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 Post subject: Re: TV RGB mod thread
PostPosted: Sat Jan 26, 2019 10:54 pm 



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The less cables the better, avoid let near high voltage points, just route the cables to a safe spot and shield, it can be the adjust on the tv but i dont even adjust a flyback so cant say


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jan 27, 2019 2:21 am 


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Location: Columbus, OH
Update, I had another BA-4D 13" (KV-13M42) model sitting around and decided to use it as sort of a test to see if I could do some things differently. This one was a success. Only difference in schematic were a couple of labels on the resistors on the A board on this model. They're the exact same values and layout, but numbered differently.

This time around, I worked slower, shielded my wires (wrapped in copper tape, then insulated), made shorter runs and just in general tried to do a cleaner job. I also built a small PCB to hold and mount resistors to keep them better organized and held in place.

Picture on the set looks much much better, still needs a bit of tweaking to both color, and maybe some of my internals (I see a slight bit of interference still in some whites I'd like to deal with, need to find the source of that).

I'm still a little unclear what the purpose of the switch is in these schematics that has the 5V and blanking. The picture looks unchanged with it on or off, and I see no difference in quality. Pictures of the set incoming, I'm very happy with how this little Trini turned out. I'll get back to cleaning up the 27V42 and think I can get my issues worked out for that one.

One thing I'd be interested to know is what gauge wire people use for their mods, especially if a type is better for the RGB signals. I'm using 22AWG solid just because I had it lying around, not sure if that's a good option.


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jan 27, 2019 2:26 am 



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Its aways good to send the service manual link for your set to get faster feedback
EDIT: Mark did a tutorial about BA-4D just back some pages
viewtopic.php?f=6&t=56155&start=2010


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 Post subject: Re: TV RGB mod thread
PostPosted: Sun Jan 27, 2019 4:01 am 


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Location: Columbus, OH
HellRazor wrote:
Its aways good to send the service manual link for your set to get faster feedback
EDIT: Mark did a tutorial about BA-4D just back some pages
viewtopic.php?f=6&t=56155&start=2010


Yeah, I mentioned I was using that guide earlier, the two models I'm working on are both BA-4D. The 13" I'm just about done with, the 27" I think I should be able to iron out my problems fairly easily.


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