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RGB Monitor and Scart-ifying it.

Chr$

Chr$

Experienced Member
Joined
Aug 13, 2021
Messages
159
Location
Saxony, Germany
This colour RGB monitor is branded Highscreen and is dated 1985 inside. I think Highscreen were a German brand. I suspect it's a clone/rebrand of something else? (any info on what that might be is welcomed).

This is mainly about the scart connection though... On the rear it has a cut-out unused space for a scart socket and on the board there are pins holes etc for a female scart socket. The holes are filled with solder but the pins do all go somewhere, so I was hoping to be able to connect a salvaged scart socket and then have the flexibility of using other computers with a scart output (which is somewhat common here in Europe).

The problem is, just behind the scart connection there are unpopulated spaces for a resistor and 2 diodes, marked R74, D28 and D30. I suspect they are important for the scart connectivity, but I have no idea what values they should be.
 

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Chr$, I just picked up a monitor with the same available SCART area on the pcb. I was going to start a thread on it after the new Year. Problem is with these sets; what other components are missing?
 
I'm hoping nothing else is missing and perhaps scart was only offered in France, where I believe it originated! Has to be worth a try though.
 
Have any more photos showing more of the pcb? If it looks like its populated fully adding the connector might be all you need to do.
 
I didn't see anything glaringly missing, will take more pics tomorrow. The 2 missing diodes are probably(?) just standard little signal diodes like the 1n4148.
 
Those would most likely work. If it was me doing it I would add them. I would try and find a schematic which may give you those resistor values.
 
It looks like the diodes and resistor are on the audio outputs, pins 1 and 3. Each of those pins has a separate diode and then both go through the resistor. There is a single speaker in the monitor so it looks to me like something to do with ensuring both the L and R audio channels are mixed to one channel properly and then perhaps bought down to the right level. I don't think I have any retro computers that also put out audio on scart so it may not be that critical.
 
It looks like your monitor will be much easier to mod than mine @Chr$ Im missing lots of components and without a schematic Im out of luck.IMG_20221206_151955.jpgBut this thing is crazy it has two DIN connectors for video? Why two(the second is the unpopulated socket)? Analogue and TTL? Composite and an unpopulated Scart connector. If I can fully populate it this would be my swiss army knife monitor on my work bench and replace my monochrome zenith.
 
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The 2 dins are FOR cvbs (analog) and TTL

LATER MAGNAVOX stereo Amiga screens would have a 9pin with buttons to select whatever mode you wanted all on a 9pin + rca composite connectors
 
My existing DIN monitor input is TTL RGB.

I've removed the PCB a little, enough to get a look at the bottom of the board properly - it's a single sided board. The scart connection pins are a bit odd though, some don't go anywhere, most importantly the pin (no.5) for Blue video ground isn't connected to anything and nor is the pin for Red video (no.15). So that's not going to work in colour with a standard scart connection providing RGB signals.

Pin 20, which is the composite video input, does go somewhere, so that might work. But I don't get why 2 of the RGB colours have a missing connection. I didn't really want to put a scart socket on it just for composite.
 
VERAULT said:
It looks like your monitor will be much easier to mod than mine @Chr$ Im missing lots of components and without a schematic Im out of luck.
Click to expand...

VERAULT said:
But this thing is crazy it has two DIN connectors for video? Why two(the second is the unpopulated socket)? Analogue and TTL? Composite and an unpopulated Scart connector. If I can fully populate it this would be my swiss army knife monitor on my work bench and replace my monochrome zenith.
Click to expand...
I have SCART modded my 1084S and it can do CVBS, S-Video, TTL video (CGA) and RGB. You can get SCART connectors from eBay and for the 1084 based monitors read here:

1084S-P mit Scart Umbau - Forum64

Hallo !Ich habe hier einen Commodore (Philips) 1084S-P welchen ich mal irgendwann nachträglich mit einer Scart-Buchse ausgestattet habe. Ich weiß heute leider nicht mehr genau warum. Es ist die Version welche normalerweise auf der Rückseite 4…
www.forum64.de www.forum64.de
 
powerlot said:
I have SCART modded my 1084S and it can do CVBS, S-Video, TTL video (CGA) and RGB. You can get SCART connectors from eBay and for the 1084 based monitors read here:

1084S-P mit Scart Umbau - Forum64

Hallo !Ich habe hier einen Commodore (Philips) 1084S-P welchen ich mal irgendwann nachträglich mit einer Scart-Buchse ausgestattet habe. Ich weiß heute leider nicht mehr genau warum. Es ist die Version welche normalerweise auf der Rückseite 4…
www.forum64.de www.forum64.de
Click to expand...
Thanks but mine isnt a 1084 variant. I should find out which brand and start looking for schematics.
 
Chr$ said:
This colour RGB monitor is branded Highscreen and is dated 1985 inside. I think Highscreen were a German brand. I suspect it's a clone/rebrand of something else? (any info on what that might be is welcomed).
Click to expand...
The style and RGB emblem reminds me of the old Microvitec monitors
 
VERAULT said:
Thanks but mine isnt a 1084 variant. I should find out which brand and start looking for schematics.
Click to expand...
It's the same / similar PCB and Philips made lots of rebranded versions with this design. If you would like SCART on that monitor and can't find the original schematic your best guess is looking at the various 1084 that are well documented.
 
powerlot said:
It's the same / similar PCB and Philips made lots of rebranded versions with this design. If you would like SCART on that monitor and can't find the original schematic your best guess is looking at the various 1084 that are well documented.
Click to expand...
Well if thats true that would certainly help my case so thanks, I will pursure that route and see what I can find.
 
Well if thats true that would certainly help my case so thanks, I will pursure that route and see what I can find.
Click to expand...
In fact it's exactly the same as the 1084S-P. I've just modded mine with a SCART connector following this video. It works great, at least with a first test with an Amiga 600, now I need to test the C-Sync issue fix...

Yours seems to miss some more components as it totally lacks the analog inputs, DIN6 and SCART.
 
jltursan said:
In fact it's exactly the same as the 1084S-P. I've just modded mine with a SCART connector following this video. It works great, at least with a first test with an Amiga 600, now I need to test the C-Sync issue fix...

Yours seems to miss some more components as it totally lacks the analog inputs, DIN6 and SCART.
Click to expand...
Does yours work properly with sound via SCART? I screwed up something when modding it, whenever there's sound playing it screws up the video sync. I have to check that eventually :) - maybe it's one of those jumper links or resistors that are wrong...
 
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