hotdogs_stuff wrote:maxtherabbit wrote:has anyone ever tried YPbPr modding a 90s curved trinitron?
I was looking at one service manual for the kv-32s22, which uses the CXA2025AS Y/C/J, and it appears to take YUV at the correct levels from the PiP board... seems like a component mod for that jungle chip would be a breeze
i have this exact same trinitron, I will try to attach the jungle chip. I am not an electrical novice (i can read a schematic but the television terminology is new to me) and i have modded several of my consoles myself. i wanted to RGB mod this television which was manufactured in the US in 1996. if a component (ypbpr) mod is possible i would prefer that as i have already purchased HDretrovision cables for all my consoles (which is not a big deal to replace them with scart, but if the component mod is possible it is preferred).
my questions are:
1- if the mod is possible for this TV, which inputs on the jungle chip would i use. being new to the terminology I can't make sense of the pins and my schematic for my Sony Wega (which does have component inputs) uses completely different terminology for the pins.
2- if the component mod is not possible can someone please point me to some reference resources for the RGB mod? I am not sure if the scart input needs to run to the jungle chip's inputs or outputs, and exactly how to set up the capacitors and resistors. the TV is still useful to me because it has s-video so i'd hate to blow it up because i didn't fully comprehend what i was trying to do.
thanks in advance.
IMG_8026 by
hotdog stuff, on Flickr
That jungle ic does take an rgb input, so it should be suitable for an rgb mod as long as it uses analog rgb (some use digital rgb signals that only support a few shades) the blanking pin is pin 17, labeled YS, which seems to be a common descriptor for blanking. The RGB inputs that you should be sending your signals from the scart connection to are pins 18, 19, and 20 (rin is r input etc.) how exactly you wire it up will depend on whether you use the mux method or the older lifted pins method that isn't reccomend.
Edit: I fixed some goofy autocorrect from earlier, I shouldn't have tried to post from my phone at 1:00AM. Also did a bit more digging on the component mod options.
As for your component mod question, I haven't seen much about doing a component mod, but if you do want to look into it, your jungle does have YUV inputs. I couldn't find a datasheet for your jungle, but I am working on a similar trinitron with a similar jungle chip, and I could find its data sheet. You should easily be able to find a data sheet for a CXA2095S very easily, and its pinout is similar. On my jungle IC, YUV SW switches between Y/C and YUV input on the jungle, so you would need to tie it high, then EYIN takes the Y signal, ERYIN takes the R-Y, and EBYIN takes the B-Y signal. I don't know a ton about how component video works and there seem to be a bunch of different abbreviations for the same thing, but I think Y corresponds to the green RCA connector, R-Y corresponds to the red (video) connector, and B-Y corresponds to the blue connector, but you are probably going to need to use some resistors and capacitors to attenuate the signals properly, and that is well beyond my knowledge. Also, you can't tell what the target peak-peak voltage for your jungle IC would be without a data sheet, so you are probably going to need to use potentiometers instead of resistors and do a lot of experimenting there. Maybe someone else knows what you need to do better than I do.
I haven’t been able to find a schematic of a repair manual for this thing either. In order to troubleshoot it and do any repairs, I’ve been tediously looking at traces and following point to point where things lead. It’s very much in the dark but I’ve managed to repair some basic things like no power to the 27v bus or 25v bus by replacing blown diodes and current limiting resistors off the fly back. It’s probably a miracle i fixed anything at all considering most of the time I’m watching videos from guys in India fixing busted up CRT TVs 
I will however see if there are similar chips available that I can potentially get a data sheet for and then I’ll try and validate it on the board itself. I don’t own an oscilloscope, only a cheap DMM but it’s gotten me this far. 
