/vr/ - Retro Games

>>2108396
Sometimes the engineers do such a hack and this one in particular is not the best solution.
Either they should added some resistance to ground before the input capacitor or better used highspeed analogue CMOS switches.

>>1983021
>fixing the white stain
Nope, building a new chassis (TV motherboard) from scratch will do.
>fixing the RGB capacitance
Yes but tricky, requires good soldering skills and practice with CRT internals.
Replacing that resistor network that sums the OSD RGB and the SCART input with an CMOS 4053 could work out. I didn't done that as the white stain bothered me too much.
>combating potentional video noise
Make sure that the SCART connection is good, i know that dry solder joints can cause a unbearable amount of noise. It looked a badly tuned RF channel.

And thank you for answering my question, now i know that all of them have this oddity.

>>1943765
This is the 2nd time when i looked at the schematic of an american Trinitron (i guess), that has a Sony IC like this where i can't find a datasheet for it. I'm slowly starting to think that the Trinitrons with SCART are clearly superior by not using Sony's ICs where the datasheets can't be found.

>One of those is from the OSD
This is in fact common practice in some SCART TVs, both signals share the same pins.
On the KV-M1450D, the RGB from SCART and the OSD are connected. Transistors are used for buffer the signal and resistors make it possible that the buffers can override the RGB input.
You also need to drive pin 25 high to enable the RGB, but this could work in the end.
The only issues you can encounter is that the RGB is offcentered to the left, like 3-6 SNES pixels.
And the contrast of the RGB input might be a little dim compared to composite and S-Video. (both issues are common in SCART TVs)
My personal method to deal with this is to make the composite darker by attaching a external terminator (a little RCA extension adapter with 75ohms to ground) to it. That's how i avoid to adjust the contrast when i switch between a console with RGB and my NES.

>the other seems to be from an unused (on my model) connector on the board.
Teletext or something similar, it would be easier to do. But how to enable this input?
I see I2C on pins 34 and 35, maybe it can be only enabled via software.

The only good question is what voltage ranges do pin 26-28 expect?
What do you want to use as RGB connector?
And follow OSD signals and pin 25.