Quote:
Originally Posted by Stedy
@ Ferix,
You mentioned earlier that you had an oscilloscope?
Can you check the composite video signal at pin 20 of the SCART lead?
Is it a good clean signal?
|
Yes, It is. See below.
Quote:
Originally Posted by Stedy
I assume you know what a composite video signal looks like?
|
Well, maybe I'm not an expert, but I think I know It.
It looks like this (as reference for the community):
Quote:
Originally Posted by Stedy
My A600's composite video output was crap, I suspect I need to replace the electrolytic capacitors on the PCB. One one TV it struggled to synchronise to the CVBS input, indeed it was detected as NTSC instead of PAL.
|
It's ok. See below (again :P).
Quote:
Originally Posted by Stedy
With the Amiga end of the cable unplugged, see if there is a signal at pin 10 at the Amiga end, there should be none, this will tell if there is a problem with the wiring. I made this mistake at first, I had to crossover pins 19 & 20 on the SCART end of the cable.
|
The cable is ok. I made It myself using new parts. And It works ok on a CRT TV.
I took some photos from the signals of my DVB decoder and my Amiga:
DVB decoder:
Amiga, using reduced CSYNC signal:
Amiga using CVBS signal:
As you can see, the most important difference is the lower level of the CSYNC signal. On the DVB decoder, It's a bit over 0v, but on the Amiga, It starts on 0v... And I think that the black level is a bit higher too.
The CVBS signal from the amiga is quite similar to the CSYNC from the DVB decoder, but without the color burst.
Note: I used the blue video signal as reference because the menu screen of the DVB decoder is almost blue, any other color signal looks similar.
The amiga samples are from the workbench's disk screen (1.3). So, almost a white screen.