Getting seperate luminance/chrominance out of Comag S 1003/12

rjg_scotland

rjg_scotland

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I've posted this on Maiden's board but having noticed this section I thought it might be a good idea to post here too.

I'm finding the composite only output of my Comag S 1003/12 annoying (and SL-35, but I don't care about it so much)... actually, make that bloody annoying. It would be fine if I was just viewing the output on a small TV, but I'm viewing it on a 32" CRT TV. The comb filter in my TV isn't bad and I'm getting little in the way of dot crawl, but I am getting noticable rainbow effects on fine patterns and general lack of sharpness. I have my freeview box (old Philips On Digital box) and old Sony DVD player - both which do RGB - daisy chained to the RGB scart input.

Now, I realise getting RGB out my Comag(s) isn't going to happen but what I am wondering is if it's likely (has anyone tried poking around?) that the seperate luminance and chrominance signals are available somewhere about the board? I could at least then use it with S-Video input on the TV.

What are peoples thoughts on this?

Thanks!
 
Llew

Llew

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What processor chip does it use? Would think it has RGB or Y/C out as well as CVBS, although if only CVBS is set by the software, you won't have them output by the chip.

Llew
 
rjg_scotland

rjg_scotland

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Dish on tripod pointing out window!
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It's the Ali M3329 B1. Here's a pic of the board with the heatsink removed: _http://pics.rguk.eu/comag_jtag/DSCF1150?full=1
Here's one from a slightly different angle but with a graphics card heatsink installed: _http://pics.rguk.eu/comag_jtag/DSCF1170?full=1

The original firmware doesn't let me choose anything other than composite, the latest Truman does but it doesn't do anything. I don't think there's anything other than composite connected to the SCART connector hence wondering if it's likely I could get luminance and chrominance seperate from somewhere on the board if not RGB.
 
Llew

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Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
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You starting point would I suppose be a pinout diagram of the chip. Unhappily I couldn't source one online, and I don't know the receiver, so can't help much there.

Llew
 
rjg_scotland

rjg_scotland

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Dish on tripod pointing out window!
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Thanks for your help anyway Llew, I had a look just there myself and have found this datasheet :) _http://0e1.org/cms/Ali_M3329_Datasheet/

I need to apply a screwdriver to my hifi at the moment as the rear speaker outputs have stopped working, but I'll sit down in a wee while or perhaps this evening and examine the pin out and see if I can work it out.

Cheers!
 
Llew

Llew

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Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
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Don't think that datasheet will help much rjg - just data interfaces to another chip as far as I can make out, must be a separate D/A video processor chip on the board somewhere.

Llew
 
rjg_scotland

rjg_scotland

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Dish on tripod pointing out window!
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Yeah I was thinking that but I can't find one! I can find the SPDIF D/A convertor for the audio but nothing for the video. I've traced back from pin 19 on the scart which is composite out and it seems to just disappear to the main CPU...

board1.jpg


board2.jpg


Perhaps I'm just following it wrong...

You're right this looks just data out to a D/A chip interface:
avif.png


Cheers
 
rjg_scotland

rjg_scotland

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Comag SL-35 (Ali A1), Old Panasonic Sky box, Old Nokia analogue box.
Dish on tripod pointing out window!
My Location
Edinburgh
Ah well that's that. Shorted something by accident (Scart pin 19 and that first large capacitor +ve side) and I've blown something and now I have no video output. Serves me right for poking about I guess. Shame but the box was free so I've not lost anything financially...

Time to save up and buy a better 2nd hand box with RGB output I think.
 
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