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Author Topic: C52 with PAL video mod.  (Read 17484 times)
VideopacBelgium
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« on: July 12, 2009, 10:13:07 PM »

Hi!
I have got one Philips C52/02. The pcb is totally different from G7000.
Can we modify this pcb to PAL video output? or RGB output?
Thanks for your help.

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Rene_G7400
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« Reply #1 on: July 12, 2009, 11:05:05 PM »

The main PCB of your C52 is almost the same as the PCB of the first G7000's (G7000/00).

Making an RGB output on it will be almost the same as on a G7000.
http://videopac.nl/forum/index.php?topic=1136.0

You'll need to get the blanking signal from pin 39 of the 8048 and send it through an inverter.
The other required signals (sound, R, G, B, luminance, sync, 5V, ground) are available at the wires which go to the SECAM modulator. (The modulator PCB will have to be removed.)

For a PAL video output you would need a PAL encoder chip (like the TEA2000).
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VideopacBelgium
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« Reply #2 on: July 12, 2009, 11:46:17 PM »

Thanks for your answer and your help.
Was the C52/02 PCB the same as a Magnavox Odyssey 2?
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Rene_G7400
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« Reply #3 on: July 13, 2009, 12:28:28 AM »

Was the C52/02 PCB the same as a Magnavox Odyssey 2?

Definitely not.
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VideopacBelgium
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« Reply #4 on: July 15, 2009, 12:10:10 AM »

Mmmm! It seems to me that to do one small pcb with 2 CI, resistors, diodes and BC548 will be too difficult for me !
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Rene_G7400
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« Reply #5 on: July 15, 2009, 10:48:37 AM »

Why? You've made a small PCB for the built-in Voice unit, didn't you?
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VideopacBelgium
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« Reply #6 on: July 15, 2009, 12:26:31 PM »

Yes, it's true.

I would like to make a PCB RGB for any G7000 model which will replace the secam modulator. (connected with the same wires)
« Last Edit: July 15, 2009, 12:36:54 PM by VIDEOPAKBELGIUM » Logged

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« Reply #7 on: July 15, 2009, 03:00:16 PM »

I would like to make a PCB RGB for any G7000 model which will replace the secam modulator. (connected with the same wires)

For the blanking signal you could combine the separate Hblank and Vblank signals which go to the Secam modulator,but the result will not be exactly the same, as the duration of the Vblank signal which goes to the Secam modulator is much shorter than the normal Vblank signal.
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VideopacBelgium
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« Reply #8 on: July 17, 2009, 01:18:31 AM »

Hi!
For the blanking signal, it's better to connect to pin 39 of the 8048. But what about the inverter?
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Rene_G7400
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« Reply #9 on: July 17, 2009, 12:36:15 PM »

For the blanking signal, it's better to connect to pin 39 of the 8048. But what about the inverter?

Pin 39 of the 8048 should be connected to the input of an inverter (74LS04 for example), the output of the inverter is the blanking signal you need for the inputs of IC 653.
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Tibopac
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« Reply #10 on: February 23, 2012, 07:45:20 PM »

Hi !

I have tried this mod on a French Videopac that looks a lot like the one VideopacBelgium has (so a C52/02 I guess).
It seems like I have the same issue as VideopacBelgium had regarding the Sync signal (the screen scrolls).
The problem is that I directly used the solution he suggested : I picked the sync signal from pin 11 of the 8048, sent it through an inverter and connected it to the R733... But it's still scrolling.

Here is the diagram of what I did, according to this present topic and this one :
http://videopac.nl/forum/index.php?topic=1136.0

I called "Links" the wires that link the main board to the modulator board, numbered from left to right when you look at the solder side of the board, having the controller sockets on your left.
As you've guessed, I soldered wires between points with the same letter (A to A, B to B, etc.)

I linked "Sync Out" to the pin 20 of my SCART cable, "Sound Out" to pins 2 and 6, "Status RGB Out" to 16, "GND Out" to 4,5,9,13,14,17,18,21, "Green Out" to 11, "Red Out" to 15, "Blue Out" to 7.

Do you see something wrong ?

Thanks in advance for your help.
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gertk
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« Reply #11 on: February 23, 2012, 09:27:00 PM »

Is the screen rolling left/right or up/down ?
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Rene_G7400
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« Reply #12 on: February 24, 2012, 09:17:08 AM »

I have tried this mod on a French Videopac that looks a lot like the one VideopacBelgium has (so a C52/02 I guess).
It seems like I have the same issue as VideopacBelgium had regarding the Sync signal (the screen scrolls).
The problem is that I directly used the solution he suggested : I picked the sync signal from pin 11 of the 8048, sent it through an inverter and connected it to the R733... But it's still scrolling.

IC 669 is not the 8048, but a NAND gate (74LS00), so you've connected the sync output to the wrong IC.
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Tibopac
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« Reply #13 on: February 24, 2012, 01:44:28 PM »

I've just tried to pick the sync signal from pin 11 of the only 74LS00 I found on the board (IC663, I think you meant this one).
I've tried once through an inverter and once directly to R733, the result is more or less the same, the screen scrolls with a variable speed from left to right and right to left, and slowly down to up.
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Tibopac
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« Reply #14 on: February 24, 2012, 03:41:35 PM »

To be correct, I see one 74LS00 on the G7200 diagram, but 2 on the C52 board.
During my tests, picking sync on pin 11 of the "good" 74LS00 or on pin 10 or 11 of the 74LS04 linked to that 74LS00, directly or through the inverter of the RGB board, I managed to stop the horizontal scrolling.
But it was still scrolling down to up with a strange picture (as if the text was in italics).

Surprisingly, I can't get this result again. Now, it's scrolling fast horizontally and slowly vertically, no matter where I pick the sync signal.
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