I managed to score 2x JVC TM-1750PN which have RGB inputs. I was silently hoping they would hold that Philips encoder but unfortunately they don't.nem wrote:Excellent, then there's two of us.K405 wrote:Hi nem, following with interest, have the exact same JVC TM-1700PN (https://cvp.com/pdf/jvc_tm1700pn.pdf)
For the record, my efforts resulted in failure. I might return to it at some point when I have more time.
That's good info as it is, because I was wondering about that.K405 wrote:I managed to score 2x JVC TM-1750PN which have RGB inputs. I was silently hoping they would hold that Philips encoder but unfortunately they don't.
How exactly do you have this wired up?nem wrote:K405 wrote:I managed to score 2x JVC TM-1750PN which have RGB inputs. I was silently hoping they would hold that Philips encoder but unfortunately they don't.
EDIT: I just tried without the resistors, no luck!
Exactly like that. I tried both pin 9 and pin 25 as sync.Star1 wrote:How exactly do you have this wired up?
From the datasheet, it looks like pins 21-23 are rgb, 24 needs 3+ volts for blanking, and pin 9 is sync
Are you certain you conencted the resistors correctly? And did you add a cap on the sync line? It can be needed, depending on which console you test with (although it probably would show at least a distorted image). Also, have you measure the blanking voltage?nem wrote:Exactly like that. I tried both pin 9 and pin 25 as sync.Star1 wrote:How exactly do you have this wired up?
From the datasheet, it looks like pins 21-23 are rgb, 24 needs 3+ volts for blanking, and pin 9 is sync
The screen is blanking and sync seems to be working because the menu jitters when there's no sync. However, I get nothing on the screen. I've put resistors and caps on the RGB lines and also tried without them.
Well spotted, that man.Star1 wrote:I got it from the datasheet, but I'm just brainstorming. It says 4V will enable OSD blanking, not RGB, but I won't pretend to have strict knowledge of the operational difference.
To be honest I'd rather not try that..nem wrote:K4OS, since you have the RGB input card, what would be interesting would be to try it on the 1700PN. Naturally you would need to switch on blanking somehow.K405 wrote:I managed to score 2x JVC TM-1750PN which have RGB inputs. I was silently hoping they would hold that Philips encoder but unfortunately they don't.
Do you have the schematic of the card, not just the datasheet for the chip? How is the OSD realized, individual inputs? One sync pulse split over the 4 inputs through resistors? Outputs?nem wrote:Alright, no worries.
@buttersoft, Star1
I grabbed three identical resistors and made some simple voltage dividers. I tried 1.65V, 2.5V and 3.3V. Unfortunately, still the same result and absolutely nothing shows up. One thing that did change was the color and appearance of the OSD. At 5V the OSD is a bright yellow, at 3.3V or under it turns a dim green.
That's kinda what I expected. Thank's Mike! At the very least, I'll do a lag test on it in 480p and see if that video processing board ads any. If not, it'll be one bad ass 720p gaming TV!mikejmoffitt wrote:From experience, most HD CRT sets can be RGB modded, but you are usually looking at a fixed useless resolution like 1080i/540p with effectively VGA, and they generally scale to that instead of multisync so you're out of luck if you try to inject anything interesting. I did this to my KV-32HS510, and removed it because it was mostly worthless.
OK, so the schematic for the input card goes so far as to show the RGBS inputs, which I presume are actually absent...? If it's fully populated bar that, the best place to insert the RGB signals is going to be where those inputs normally go. Either way you'll have to figure out how to switch inputs on the set. The problem might be that this set doesn't use that particular jungle chip for anything to do with the OSD, at least the OSD is NOT done through the RGB inputs? It may be muxed into the outputs. Certainly the only thing going into the RGB inputs on the TDA8366 Jungle chip is external RGB from the inputs on the top left.nem wrote:Block diagram herebuttersoft wrote:Do you have the schematic of the card, not just the datasheet for the chip? How is the OSD realized, individual inputs? One sync pulse split over the 4 inputs through resistors? Outputs?
Circuit diagram here
The full service manual can be found here (9mb pdf).
This is how I've done it.buttersoft wrote:OK, so the schematic for the input card goes so far as to show the RGBS inputs, which I presume are actually absent...? If it's fully populated bar that, the best place to insert the RGB signals is going to be where those inputs normally go.
Yes, it is muxed into the outputs.Either way you'll have to figure out how to switch inputs on the set. The problem might be that this set doesn't use that particular jungle chip for anything to do with the OSD, at least the OSD is NOT done through the RGB inputs? It may be muxed into the outputs.
I hear youI'll keep looking at the schematics, but I'm not very good at this compared to someone like Tim
Next, i'd try reducing the blanking voltage you're using all the way from 5V to just about zero. You never know. Get some pots as dummy load and measure what happens at the pin.nem wrote:Yes, it is muxed into the outputs.buttersoft wrote: Either way you'll have to figure out how to switch inputs on the set. The problem might be that this set doesn't use that particular jungle chip for anything to do with the OSD, at least the OSD is NOT done through the RGB inputs? It may be muxed into the outputs.
. When the select pin is low, it'll output RGB2 and rapidly switch to RGB1 when select is high. The OSD blanking signal is used for this. 
. Did a KV-27S42 and like the previous ones done here on the thread, I must say it looks amazing!. It had Horizontal shift issues with feeding sync to the composite video port, I put the sync on luma but surprisingly it would not get along with the CPS2 sync signal. Sync fed to luma worked with every other source besides the CPS2 so I just threw a switch on there to select between the two. 
