Sync issue with a video monitor

[davewellington]

Grabbed a JVC TM-90PSN recently as my 1084s blew up. Seems like a nice little monitor, 10". Anyhow, today I got around to soldering up the 8 pin DIN RGB header. Unfortunately it has VSYNC and HSYNC separately. I wasn't 100% sure what to do, so I soldered composite sync onto H.SYNC. The screen of course rolls when a game is running.

Below is the pinout from the manual (manual link here). Is there something I can do about this or am I ****
Cheers

[emphatic]

I would just combine both sync leads.

[Wurstkopp]

Hm, maybe you'll need a sync separator like the LM 1881.

Or you'll try to connect directly to pin 11 of the 14 pin-chip, it's stated as H + V.

[davewellington]

I would just combine both sync leads.

So run composite sync into both V and H Sync?

[Wurstkopp]

I would just combine both sync leads.

He does not have 2 sync leads, thats his problem.

The 8-pin-connector doesnt have a CSync input. But the 14-pin-chip does output CSync (if you'd feed it with the 2 H and V-signals). So you just put your CSync signal there.

[davewellington]

I would just combine both sync leads.

He does not have 2 sync leads, thats his problem.

The 8-pin-connector doesnt have a CSync input. But the 14-pin-chip does output CSync (if you'd feed it with the 2 H and V-signals). So you just put your CSync signal there.

The 14 pin chip is internal, I don't really want to bust the case open (it looks like this btw). Is connecting the CSync to HSync and VSync is a bad idea?

[Hewitson]

That's very unlikely to work. Tapping directly into that chip or constructing a sync splitter is almost definitely going to be required.

[davewellington]

Finally got around to doing something about this - both using the sync splitter, and busting the case open and soldering C-Sync directly to the pin (11), I get this:

Get the feeling the issue is with the monitor instead of my wiring Any ideas? I don't have anything that fits the rest of the inputs so I can't test it that way.

[davewellington]

A polarity reverse later and...

bam! Needs some serious tuning, but we're alive Thanks to Ross for pointing out the switch on the pcb

[FrancoB]

Nice one D

[davewellington]

Where's my hero video

[Rossyra]

You're welcome, glad you've got it stable

[Beaps]

I picked up one of these the other day.

I wanna use the rgb to connect scart console to it, something like this?

Console --> RGB Scart --> Female Scart input with 8 pin connector --> RGB into monitor

Anyone know how easy the Female Scart input with 8 pin connector would be to make up?

Thanks
B

[Spectre]

As hard as joining the dots with some 8 core cable I guess. Slightly tougher if you need to build the sync stripper circuit as above, but still not a massive job. I've managed it before and I've had very little prior experience of soldering, I think I even made a nice clear diagram of the circuit if you need it.

[Beaps]

Yer that would be cool mate if you don't mind

[Spectre]

It's amongst this lot;

http://www.ultimatefinishuk.com/spectre ... a/s2j.html

[Beaps]

How does this look?



Not sure where the H pin (pin4) connects to?

[Spectre]

Pin 4 is horizontal sync and pin 5 is vertical sync. Scart doesn't make use of a pure sync signal, but if you're lucky some consoles will output composite sync to scart pin 20 rather than composite video. Even so that is unlikely to be enough to give you a stable picture on your monitor, which is why you'll need to build the lm1881 circuit to split compatible sync signals from your composite video. You then wire those to pins 4 and 5 on the 8-pin din.

[Beaps]

OK so I made a sync strike tonight but I still need a little help



Just need to know where to connect the following

From the Din

V= ?
H= ?

From the Sync Stripper

Csync Out = ?
Cvid in = ?
Vertical Sync Out - ?
5v = ?

Thanks
B

[Spectre]

From the Sync Stripper

Csync Out = Din H
Cvid in = Scart 20
Vertical Sync Out - Din V
5v = to a source of +5v, you could try measuing pins on the scart to see if any are suitable, pin 8 or 16 might do.