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 Post subject: Re: Sony BA-5D/BA-5 Chassis TV RGB Mod with OSD Mix
PostPosted: Tue Oct 08, 2019 1:51 am 



Joined: 26 Sep 2019
Posts: 27
MarkOZLAD wrote:
nintari,

Can you more clearly describe your audio problems? Having trouble following.

For stereo you may need to trigger a ground point in the right audio channel RCA input. Can do this by sticking an RCA plug in the input.


I was trying to tap in to the L/R audio inputs on the video one bank (underside of the board) where I'm using sync and ground to the s-video port. I was using an RCA Cable plugged in with the bare center wire of said RCA cable attached to one lead of the multi meter to try to see which contact point was the white and red RCA audio ports. but when doing this it seemed as if three points were toning out regardless of which port I was plugged in to.

As of right now I have audio but it is extremely low. part of my mistake was more than likely thinking I could use a common ground between both the video and audio. it is grounded that way on the scart connector I put in (2, 5, 9, 13, 17 all going to the s-video ground pin). Or I may be feeding both channels in to the same channel...

I do however use this s-video port form my extron MPS 112 for any consoles that are only capable of s-video. So currently (though whilst nothing using s-video is on) there is a lead form the switcher plugged in to this video and audio ports under normal operation. I plan to grab a pic of the underside where I'm trying to tap in since I was doing things the hard way and not detaching the board completely form the system (so I was upside down on an ottoman while doing this lol). Yes I did discharge the tube and stayed away form most of the high voltage circuit in case the caps were not fully discharged. As with many things this short project started to annoy my fiancee which of course put me in to a bit of a bad mood lol.

While I'm not incredibly versed in working on CRTs it is something I do have very minor experience on, with a combination of years of dabbling in electronics (and a short time working in an arcade). I originally started in 1995 in the Army as a 25R which is audio video information repair, or a glorified TV tech.... but didn't really use any of that for a very long time until I began working at a TV Station 15 years ago...but by that time analog was on the way out and we became a disposable society of sorts and no one really worked on this type of stuff much. Part of me and my love for all things video game related felt this was a dying art and it made me sad to see so many CRTs being discarded lol. sorry for the lengthy post but figured I'd at least give a baseline of my knowledge on this stuff...there is so much to learn and I'm late to the party but we have to start somewhere.


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 Post subject: Re: Sony BA-5D/BA-5 Chassis TV RGB Mod with OSD Mix
PostPosted: Thu Oct 10, 2019 2:08 am 



Joined: 26 Sep 2019
Posts: 27
well soab.... i was chasing my own ghost.

guess I partly told what was wrong in the previous description...I guess having the audio tapped in from the scart AND having RCA lines plugged in from my MPS112 couldn't happen... as soon as I unplugged them the scart audio normalized. as soon as I plugged the RCA plugs back in...audio shot waaaay down in level (oddly even on the OSSC Side of the gscartsw).

I thought I could have them plugged in as long as both weren't active at the same time...or am I still soldering to the wrong points lmao


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 Post subject: Re: Sony BA-5D/BA-5 Chassis TV RGB Mod with OSD Mix
PostPosted: Fri Oct 11, 2019 1:08 pm 



Joined: 26 Sep 2019
Posts: 27
Ok, so I redid things and made them permanent. I decided to use the front i/o board to tap in to for sync, ground and audio. In addition I mounted the blanking switch on the front of the TV in the i/o & button panel section. I posted up some pics... I should have gotten better but honestly DRC has the pics up of this set and where he tapped in the wires.

https://imgur.com/a/BBdqLEB

Next issues to take care of:

Something in my chain is causing RF interference. Oddly if I unhook the OSSC it mostly goes away. If I unhook all the other AV cables in the back it seems to amplify the interference when the ossc is plugged in. This happened with my older OSSC as well so something somewhere is picking up this interference. The vast majority of cables I have are overkill and shielded...but one could be slightly touching the shielding and or a bad cable.

I'll add the other info as I can and get the pics uploaded. I want to try to catch a few things and get your opinions.


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 Post subject: Re: Sony BA-5D/BA-5 Chassis TV RGB Mod with OSD Mix
PostPosted: Sun Oct 13, 2019 10:53 pm 



Joined: 26 Sep 2019
Posts: 27
Ok here is one of the issues I was speaking of... did I wire the blanking switch backwards or was my resistor possibly bad (I used a 2.2kOhm)?

When blanking is on the screen has a ghost to it, when it is off... it doesn't.

https://imgur.com/a/TGt79zZ


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 Post subject: Re: Sony BA-5D/BA-5 Chassis TV RGB Mod with OSD Mix
PostPosted: Sat Oct 19, 2019 9:20 pm 



Joined: 26 Sep 2019
Posts: 27
Oddly enough the switch was flaky after replacing my issue went away! I noticed after I took everything back apart to see what I could move around and route differently and shield better... when jiggling the switch around the sync kept going in and out until it just stopped all together. just goes to show, sometimes the simplest answer is the correct one.


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 Post subject: Re: Sony BA-5D/BA-5 Chassis TV RGB Mod with OSD Mix
PostPosted: Sun Oct 20, 2019 5:34 am 



Joined: 21 Sep 2019
Posts: 2
I have to hold off on my modding of my KV-27S42 as I wait for a Retro Access cable to come in (hopefully this one if I make it tomorrow) but until it does I have a few questions.

First off, both of my RGB modded consoles output csync so I should be fine wiring sync to go through composite video instead of the luma on the s-video, right?

The second question is about the blanking set-up: Image
Now I am planning to use a BNC input instead of a SCART input so because there is no SCART/pin 8 to pull the 5v from, I can just pull any 5v from the tv board or is there one that would be recommended?


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 Post subject: Re: Sony BA-5D/BA-5 Chassis TV RGB Mod with OSD Mix
PostPosted: Sun Oct 20, 2019 7:11 am 



Joined: 18 May 2017
Posts: 595
Csync can go through AV or SVideo luma. The SVideo luma has been used because people have reported that it reduces or eliminates the “left shift”.

On the diagram I give two options for 5V, EEPROM leg 8 or 5V regulator output. There are likely many other places you can grab it from
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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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