MarkOZLAD wrote:
I found that the people could put up with a faded OSD and moved on with life.
How many more sets left to do? Did you look at the Qunitrix? Cool name.
The EXT RGB lines are used for teletext AND OSD.
The INT RGB line are rigged up for component.
All and I mean all the Sony Teletext units I have worked on have 470ohm terminations on the EXT RGB lines
When you add another 75ohm termination resistor to a line that already has a 470ohm termination the total resistance is 136ohm.
Go twist a 470 and 75 together and check it on the multimeter. Wait I just did and its way lower, its 64 ohm, Resistors are confusing.
470+75= 64ohm
470+90=75ohms, Maybe we could make a simple termination switch that links 90 ohm resistors to the RGB lines ??
So your menu is way to dim/drained because it its being grounded to heavily, It wants to sit at 470 but your putting it at 64.
The console wants 75 but it gets 64 and is grounded too much but should really be darker...
So I modded another one of those chassis thismornning, had a look at the board and its pretty much identical.
KV-xa29m31
With my new understanding of these chassis in place I ripped out the teletext module, wired a scart to its RGB-BL header and sync+audio to the component board. 5v supplied from console.
Did not change the 470ohm terminations or the coupling caps. Just wired to plugs
Put the lid on and fired it up, works as expected.
Solid menu till your running an RGB feed, and the RGB feed is too bright but can be fixed with menu set to almost 0
Feels dodgy but its the only way I can see to do these sets without an OSD switch. A proper 75ohm termination for the console would be nice.
Now who's doing it the hard way?