Hey Jason... how's about coming up with a vector monitor tester that can be used on color and b/w monitors. Bonus points if it's mode switchable between analog and digital signals...
Dylan
Ideal setup for CRT testing/repair?
- Thread starter DarkKobold
- Start date
Dylan
already have one it looks nearly the same as my raster version. currently it has a wire jumper on the board and i want to fix that before i sell them
The Sencore CM2125 can be had cheap on ebay it is the big brother to the CM2000 and a better tool. This is how I have mine set up. I use a break out box so I can use separate test leads.
The nice thing about these is the built in isolated meter and drive substitution systems. It is also programmable so you can save presets. It is a very useful tool that is often overlooked because the adapters are always missing and you have to make your own. Here is the manual
https://archive.org/details/cm-2125-operator-manual-1
For vector monitors I use this dac daughter card on top of a FPGA board. It was a bitch to assemble so I am making the bigger board shown here. These plug into any of the Terasic/Altera FPGA boards and I have an Asteroids game ported to them along with the test screen. I will put one together for you if you are interested.
The nice thing about these is the built in isolated meter and drive substitution systems. It is also programmable so you can save presets. It is a very useful tool that is often overlooked because the adapters are always missing and you have to make your own. Here is the manual
https://archive.org/details/cm-2125-operator-manual-1
For vector monitors I use this dac daughter card on top of a FPGA board. It was a bitch to assemble so I am making the bigger board shown here. These plug into any of the Terasic/Altera FPGA boards and I have an Asteroids game ported to them along with the test screen. I will put one together for you if you are interested.
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Something to be noted. Zero interest in arguing.
A tech with better skills than I. Using a monitor source similar to what been posted.
Monitor in question sanyo 20ez. Color are ok with test bench source but colors were off using the dk pcb. Scope was applied. It looks like red signal was floating.
It seems one signal diode did failed which was the cause. Yea for the tech for figuring it out.
So why did the monitor work with the bench device and not the pcb?
With a strong video signal from the bench monitor source, it was able to over come the issues that the failed signal diode caused.
While I have never seen this issue before since signal diodes rarely go out. It is worth remembering. If anyone runs across this issue.
A tech with better skills than I. Using a monitor source similar to what been posted.
Monitor in question sanyo 20ez. Color are ok with test bench source but colors were off using the dk pcb. Scope was applied. It looks like red signal was floating.
It seems one signal diode did failed which was the cause. Yea for the tech for figuring it out.
So why did the monitor work with the bench device and not the pcb?
With a strong video signal from the bench monitor source, it was able to over come the issues that the failed signal diode caused.
While I have never seen this issue before since signal diodes rarely go out. It is worth remembering. If anyone runs across this issue.
Yup I used to work at Ted and Wally's around 2011-2013 (I think that's when I left) and yup that's the antique shop I was thinking of. He always had some neat stuff down there
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No Way! I lived in Old Market Place in 2012 - I could look down into your parking lot.
I had ice cream at Ted and Wally's a bunch of times (when I could afford to wait - you guys were ALWAYS slammed with business). We probably crossed paths.
Small world!
WadeLanham
Well-known member
I would be buying this but I finally broke down and bought one (after all these years) just a few months ago. Yours is nicer than the one I bought though!
Obviously you want to use an isolation transformer, but doesn't the frame of the monitor still need to be grounded? Neither of these variacs have a grounding pin on the AC power cord. Especially if you're doing monitor work on a test bench, isn't there a risk of shock if the monitor frame builds up a charge and is not grounded? If you touch it, you might ground it yourself.
️
To ground or to not ground... that is the question.
I just went through this exercise here.
I just went through this exercise here.
Electrical gurus - test bench upgrade
Hey guys, Can someone who has electrical know how confirm that I can add a 120v to 100v iso transformer to my test bench set up. I'd like to add the ability to plug in Nintendo style monitors that only require 100v. I have a standard outlet now on my jamma test box. I was thinking I could...
forums.arcade-museum.com
SNESNESCUBE64
Well-known member
I really like your breakout box design and am tempted to make my own now (reduce the number of cables I need to keep). I have to ask though, what is TVA power and how often do you use it?
Regarding "best" setup, it really is whatever works best for you. I have a CM2000 and love it to death. In terms of power, I have a box with an iso and pacman transformer for my AC needs. For Nintendo monitors I have a seperate 100V iso box.
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Exactly. That recent thread was on my mind when I posted the above. I'm putting together a monitor test bench power supply myself inspired by the design @lilypad19 shared in that thread.
Sencore made a video analyzer (TVA92) that had some nice yoke and ringer tests but it had to be connected to a VG91 (unobtanium) to power up and get sync. I wired this switch in to power it up. I got rid of the TVA92 and got a HA2500 that handles the yoke and flyback tests and has a great substitution B+ power supply. This is my bench, I made an isolated variac AC/DC supply last weekend as the monitor I am working on needed 95VDC power.
Good point. I have never seen the signal diode issue but I have seen a case where the horiz sync from the signal generator allowed the monitor to work but it wouldn't sync from the PC. Replacing the sync processor chip fixed the problem, likely because like you said the drive from the generator is stronger.
Ohmerone
Well-known member
This model is cheap and i can help to fix it if needed.
good to use on Vintage chassis and more
for the bench.
Or one like it!
I used it for Monitor repairs for like 30yrs and on service calls for tvs back in the day.
I have used all their equipment over the years
Hand held TPG are good to have to use anywhere
I use old game boards for bench or Analyzers for all frequencies and TPG
Then you can inject a missing signal like H-Drive Video drive,sync
Audio can be used to check game board amps by injecting a good signal
to the Ic
heres some tips.
on what you can use to troubleshoot any monitor chassis.
Plus other mention tools.
good to use on Vintage chassis and more
for the bench.
Sencore Va 62 Analyzer | eBay
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www.ebay.com
Or one like it!
I used it for Monitor repairs for like 30yrs and on service calls for tvs back in the day.
I have used all their equipment over the years
Hand held TPG are good to have to use anywhere
I use old game boards for bench or Analyzers for all frequencies and TPG
Then you can inject a missing signal like H-Drive Video drive,sync
Audio can be used to check game board amps by injecting a good signal
to the Ic
heres some tips.
on what you can use to troubleshoot any monitor chassis.
Plus other mention tools.
Dang this is pretty awesome.
"Honey, are you almost done repairing that monitor?"
"Almost babe, Enterprise killscreen coming up!"
WadeLanham
Well-known member
I have two nos isolation transformers if anyone wants to buy one. Forgot that I've had them sitting on my shelf for ages! Never have needed them. PM if anyone needs one.
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