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composite video pattern generator

Posted: Wed Oct 14, 2009 8:25 pm
by dacflyer
my tenma model 72-1070 pattern generator is not working well anymore.
i cannot find a replacement on MCM anymore. and i am not good enough to repair this one i have.
it does make video on a monitor, but the color bars and patterns are not working like they used to.. i have looked at it, but its too compact for me to see anything. and i do not have everything i need to deal with it.

anyone here wanna work with it ? repair it. will pay you for your time.
unless you know where i can find one at a decent price. i only need it to work on video game monitors hi res. and med res. and it must be composite.

Re: composite video pattern generator

Posted: Wed Oct 14, 2009 8:46 pm
by MrAl
Hi dac,

Do you have a schematic?

Re: composite video pattern generator

Posted: Wed Oct 14, 2009 11:05 pm
by Bob Scott
Check out ebay and search for "bar generator" or "electronic test equipment". Stuff is so dirt cheap. THOUSANDS of pieces from antiques to modern.

It is sad. All this stuff used to keep people employed. Now it is just about worthless. I did see a pattern generator in there, dots and hatch for convergence.....I was going to say "registration".

Re: composite video pattern generator

Posted: Thu Oct 15, 2009 6:37 am
by dacflyer
MrAl >> no i cannot find any info on it. i only know i bought it from MCM many years ago..
wasn't cheap either. think i paid bout 200.00 something for it.
not sure if it got zapped one day or dropped it, but eitherway i cannot get it to work right..
but i'll probaby look on ebay and see whats out there. would rather have this one repaired if possible.

Re: composite video pattern generator

Posted: Fri Oct 16, 2009 3:32 pm
by dacflyer
i looked at this today on ebay.. any comments,,
http://cgi.ebay.com/PC-LCD-Monitor-Vide ... 4a9b65c6ea
worth getting ? will only be using to to test video game monitors and or computer monitors.
or any other suggestions ?
just need a simple video generator to see if the pic. is good or not.. i do not need anything complicated.

Re: composite video pattern generator

Posted: Fri Oct 16, 2009 3:47 pm
by CeaSaR
You know what Dac, I seem to remember a project for this a few years ago. I'm going to
have to dig deep into the ancient recesses of my magazine library to see if I'm right.

Anyone else remember what I'm thinking of? No idea which magazine, though.

CeaSaR

Re: composite video pattern generator

Posted: Sat Oct 17, 2009 3:57 pm
by nevdull
I've found this monitor tester to be pretty neat. Has several test patterns, very easy to make.
http://www.eosystems.ro/deogen/deogen_en.html
:eek:

Re: composite video pattern generator

Posted: Sat Oct 17, 2009 4:02 pm
by jwax
dac- That ebay item would do the job, but it brings up a question- Don't some game consoles (older?) use an RGB video signal rather than VGA or SVGA video? Do you need to test RGB monitors too?
Reason I'm asking is because we have an old monitor that failed in a good piece of equipment that uses RGB video. I'm looking for a RGB-to-VGA converter so I can use a new computer monitor.
Anyway, could you use PC-generated test signals? Looks like there's a few free software programs out there.

Re: composite video pattern generator

Posted: Sun Oct 18, 2009 6:11 am
by Jim Barrett
G'day Folks,
There is a DVD that supplies test patterns etc. for TV adjustment. I think it's called "DVD Video Essentials". DVD players are cheap now & could supply a variety of outputs. It's what I do when I need a test pattern.
Actually, I got the DVD from my local library & then decided it was what I needed so I went ahead & bought it. Barnes & Noble & I think about $35.00.
Jim

Re: composite video pattern generator

Posted: Sun Oct 18, 2009 11:09 am
by MrAl
dacflyer wrote:MrAl >> no i cannot find any info on it. i only know i bought it from MCM many years ago..
wasn't cheap either. think i paid bout 200.00 something for it.
not sure if it got zapped one day or dropped it, but eitherway i cannot get it to work right..
but i'll probaby look on ebay and see whats out there. would rather have this one repaired if possible.
Hi again,


I would take a look at it if i had a schematic, but with some things it's a nightmare trying to fix
something without a schematic. I dread even doing my ATX power supply voltage output modification
without having a full schematic. In fact, if you could get a schematic somehow i could tell you
just by looking at the schematic if i could fix it or not. It mostly depends on what kind of parts
they used, if they are well documented and still available.

How many parts does the pc board for this thing have?

Re: composite video pattern generator

Posted: Mon Oct 19, 2009 10:31 am
by dacflyer
MrAl >> i cannot find any info on it at all..

JWAX >> the item i have is indeed will work for a VGA SVGA monochrome , and they are all having the RGB output in the cable as well as the sync signal, they actually make a DB15 cable with the RGB seperated. i use a homemade cable that has the ends i need on them to be able to just plug them right onto the video connector on the monitor, usually its a 6 pin female connector or simmilar. but mine is just broke now :P
the one i tried to win on ebay sold for $100.00 i was outbid instantly each time, and after it was over, i was offered a 2nd chance to buy it..not for 100.00
i'll buy the one a guy has for 35.00 in australia.

Re: composite video pattern generator

Posted: Mon Oct 19, 2009 11:06 am
by CeaSaR
How about a Model 72-870? Check here.

CeaSaR

Re: composite video pattern generator

Posted: Mon Oct 19, 2009 12:05 pm
by CeaSaR
This site has some possible solutions if you wanted to build a new piece of equipment.

CeaSaR

Re: composite video pattern generator

Posted: Tue Oct 20, 2009 5:15 am
by dacflyer
thanks, that item you showed, is NTSC, i need composite video.
no time or patience to build anything right now..too many other irons in the fire right now.

Re: composite video pattern generator

Posted: Wed Oct 21, 2009 11:33 am
by dr_when
thanks, that item you showed, is NTSC, i need composite video.
I thought NTSC WAS composite video.