Nice install, I built a monitor from a 25" tv, bought an arcade Hantarex Chassis and set it all up, was a lot of fun building that and getting the picture just right, had it all working outside of my cab on the bench so put it all in the cab all wired and ready and the tube did not what to light up no glow on the tube neck nothing, I could hear the chassis running but no high voltage, so took it all back out cast my eye over the board and saw nothing, in the end I found some cracked solder joints on the horizontal transistor which were so hard to see I needed an eye glass to see it, reflowed them and boom the tube kicked in, the picture is awesome.
I've got to make another revision to the pcb, there is a slight usability issue that is annoying and needs to be fixed, then I'll post more details about it. I'll have it ready in a few weeks.
That was 😎 it seems if u hooked the tube to a better chassis like a wells gardner it would've been perfect. I wouldn't have put a resistor on the yoke.. maybe that's why your screen was jumping. If ur yoke was reading low, why add a resistor? Let her rip. Since your monitor is sideways perhaps adjust your horizontal size n hold.
did you ever fix the blooming issue? I was thinking about trying one of these chassis with an old 25" tube I have but that blooming would drive me nuts.
PCBJUNKIE, what is the difference between sync signals compared to Deflection signals, what are the differences? Can you explain the difference between a Raster monitor compared to a XY vector monitor?
A raster monitor draws the frame line by line, usually starting with the top left, going all the way to the right horizontally, then retracing back to the left and drawing a new line, left to right again, just below the previous one. This movement of the electron beam (raster) is controlled by the deflection signals from the monitor's internal circuitry, and is synchronized / reset by the sync pulses. The sync is only a short pulse, but it tells the monitor when to start a new line (horizontal sync) or go back to the top left corner to start a new frame (vertical sync). Vector monitors don't have this "line by line" circuitry so they allow for full control of the position of the electron beam at any given time. A vector monitor can therefore draw the image on the screen in any direction, just like a raster monitor can, but in most applications, only a series of independent vectors is drawn to form an image without scanning the entire screen.
@@pcbjunkie1 thanks, the deflection signals are sending voltage& current signals pulses to the YOKES and the YOKES are sending "magnetic signals" to the Electron beam? The Deflection signals are just High Voltage Pulse square waveforms but how do deflection signals do the position coordinates CRT screen using the Electron beam. What I mean is that the Deflection plus voltage& current value pulses the YOKE. The Yokes magnetic field determines the CRT coordinates position of the electron beam? I'm confused because V&H sync signals are the CRT coordinates positions of the electron beam but also the Deflection signals are the CRT coordinates position of the electron beam, so I'm confused between the sync signals and deflection signals in raster monitors. The advantage of Vector monitors was that they can draw "shapes" better detail or what was the advantages of using Vector monitors compared to Raster monitors?
@@billwilliams6338 In raster monitors, the sync is a digital pulse that tells the monitor to restart the raster scan. The monitor itself creates the deflection signals and sends it to the yoke which bends the electron beam to a desired position. In a vector monitor, the deflection signal is generated by the attached device. The deflection at the yoke is always analog (no pulses), and yes the current determines the amount of "bend" of the beam. Vector monitors take in X-Y coordinates (and RGB ) as analog voltage and amplify it for the yoke.
@@pcbjunkie1 thanks for the help, Any reasons why you can't connect a grounded earth oscilloscope to the arcade monitors circuit boards because it will damage the circuits boards. I'm not sure why they make the arcade monitor circuit boards not connected to earth ground. They use an isolation transformer to lift the earth ground from the monitors chassis but not sure why. The Flyback outputs a High Voltage from 19Kv to 30Kv but the CRT anode, but this High voltage is just only used to power the CRT tube or does the Flyback supply other circuits in the monitor or its only used to just Power the CRT tube? The Focus trim pot , picture tilt trim pot and Contrast trim pot on the monitor boards are adjusting the Electron Beams Position by "bending" the Electron Beam? or is the focus , tilt, contract adjusting the current or voltage to the electron beam?
How did you ultimately fix the waviness that you had when you talked about originally turning up the high voltage. I got this exact same chassis and I get some slight waves similar to yours at 19:40 . Later in the video you have a bright image but you eliminated those waves. Check out my most recent video of the effect I get. You seem to be the only one who has recent experience with this chassis who can help.
I looked at your video. Your problem seems different. The waves in mine were (still there actually) due to brightness. Yours seem to be due to being too close to a transformer. That would be my first guess.
@@pcbjunkie1 Okay thanks for checking it out. You're probably right it could even be the flyback transformer failing. I made the mistake of booting it up without an isolation transformer for a good 2 minutes and I think I did some damage. Not really the end of the world because I still get something that looks decent but I'm still a little bummed I can't get rid of these waves without spending another 50$ to maybe fix it.
These chassis are utter garbage. Mine came with the B+ pot broken! Fake Nippon Chemicon caps all around it’s pathetic... I got a picture but blooming was atrocious and contrast was all over the place. Needless to say it went back right away for full refund! (And that alone was a minor miracle!)
Yeah, it can be bad on some games with bright colors. I got a couple more of these and I'm going to experiment a bit. See if I can figure out a way to make them a little better.
Nice! I want to do this exact thing to a few TV sets. I just want to have a 25" vertical and 25" Horizontal JAMMA cab. I actually have a Virtua Fighter 2 cab with a 25" STD/MED res monitor with a dead chassis but if I get it working I hate to butcher the machine.
Nice install, I built a monitor from a 25" tv, bought an arcade Hantarex Chassis and set it all up, was a lot of fun building that and getting the picture just right, had it all working outside of my cab on the bench so put it all in the cab all wired and ready and the tube did not what to light up no glow on the tube neck nothing, I could hear the chassis running but no high voltage, so took it all back out cast my eye over the board and saw nothing, in the end I found some cracked solder joints on the horizontal transistor which were so hard to see I needed an eye glass to see it, reflowed them and boom the tube kicked in, the picture is awesome.
Dude you’re flipping awesome!!
I've been trying to get that same chassis working and really would need one of your test tools when you start selling them.
I've got to make another revision to the pcb, there is a slight usability issue that is annoying and needs to be fixed, then I'll post more details about it. I'll have it ready in a few weeks.
That was 😎 it seems if u hooked the tube to a better chassis like a wells gardner it would've been perfect. I wouldn't have put a resistor on the yoke.. maybe that's why your screen was jumping. If ur yoke was reading low, why add a resistor? Let her rip. Since your monitor is sideways perhaps adjust your horizontal size n hold.
GREAT VIDEO MAN , keep doing this kind video , i really like :D
Are these Wei Ya chassis compatible with the K7400 and U2000 tubes? I am new to this with an older tube and a K7401 that is going into HV shutdown.
I have the pin cushion issue, but I can't make out what you're saying at 19:14. scram wire??
Loose ground wire. Took me a while too. :)
did you ever fix the blooming issue? I was thinking about trying one of these chassis with an old 25" tube I have but that blooming would drive me nuts.
How long can the 25w resistor withstand that type of heat? Any modifications to it? Still holding up?
PCBJUNKIE, what is the difference between sync signals compared to Deflection signals, what are the differences? Can you explain the difference between a Raster monitor compared to a XY vector monitor?
A raster monitor draws the frame line by line, usually starting with the top left, going all the way to the right horizontally, then retracing back to the left and drawing a new line, left to right again, just below the previous one. This movement of the electron beam (raster) is controlled by the deflection signals from the monitor's internal circuitry, and is synchronized / reset by the sync pulses. The sync is only a short pulse, but it tells the monitor when to start a new line (horizontal sync) or go back to the top left corner to start a new frame (vertical sync). Vector monitors don't have this "line by line" circuitry so they allow for full control of the position of the electron beam at any given time. A vector monitor can therefore draw the image on the screen in any direction, just like a raster monitor can, but in most applications, only a series of independent vectors is drawn to form an image without scanning the entire screen.
@@pcbjunkie1 thanks, the deflection signals are sending voltage& current signals pulses to the YOKES and the YOKES are sending "magnetic signals" to the Electron beam? The Deflection signals are just High Voltage Pulse square waveforms but how do deflection signals do the position coordinates CRT screen using the Electron beam. What I mean is that the Deflection plus voltage& current value pulses the YOKE. The Yokes magnetic field determines the CRT coordinates position of the electron beam? I'm confused because V&H sync signals are the CRT coordinates positions of the electron beam but also the Deflection signals are the CRT coordinates position of the electron beam, so I'm confused between the sync signals and deflection signals in raster monitors. The advantage of Vector monitors was that they can draw "shapes" better detail or what was the advantages of using Vector monitors compared to Raster monitors?
@@billwilliams6338 In raster monitors, the sync is a digital pulse that tells the monitor to restart the raster scan. The monitor itself creates the deflection signals and sends it to the yoke which bends the electron beam to a desired position. In a vector monitor, the deflection signal is generated by the attached device. The deflection at the yoke is always analog (no pulses), and yes the current determines the amount of "bend" of the beam. Vector monitors take in X-Y coordinates (and RGB ) as analog voltage and amplify it for the yoke.
@@pcbjunkie1 thanks for the help, Any reasons why you can't connect a grounded earth oscilloscope to the arcade monitors circuit boards because it will damage the circuits boards. I'm not sure why they make the arcade monitor circuit boards not connected to earth ground. They use an isolation transformer to lift the earth ground from the monitors chassis but not sure why. The Flyback outputs a High Voltage from 19Kv to 30Kv but the CRT anode, but this High voltage is just only used to power the CRT tube or does the Flyback supply other circuits in the monitor or its only used to just Power the CRT tube? The Focus trim pot , picture tilt trim pot and Contrast trim pot on the monitor boards are adjusting the Electron Beams Position by "bending" the Electron Beam? or is the focus , tilt, contract adjusting the current or voltage to the electron beam?
Hola amigo una pregunta el transformador es recurrible para el chasis o el chasis funciona sin el trasfirmadir
Where can I get a isolation transformer like that?
I have this same chasis. Is there a way to connect horizontal and vertical syncs seperately or is it always the two cables to the same pin?
you can use the same pin for both it doesnt matter like you connect the sync to the csync and you start a new cable from csync to vsync.
You mention at @13:20 that there'd be a link in the description for your signal generator test tool. Could we get that link? :)
How did you ultimately fix the waviness that you had when you talked about originally turning up the high voltage. I got this exact same chassis and I get some slight waves similar to yours at 19:40 . Later in the video you have a bright image but you eliminated those waves. Check out my most recent video of the effect I get. You seem to be the only one who has recent experience with this chassis who can help.
I looked at your video. Your problem seems different. The waves in mine were (still there actually) due to brightness. Yours seem to be due to being too close to a transformer. That would be my first guess.
@@pcbjunkie1 Okay thanks for checking it out. You're probably right it could even be the flyback transformer failing. I made the mistake of booting it up without an isolation transformer for a good 2 minutes and I think I did some damage. Not really the end of the world because I still get something that looks decent but I'm still a little bummed I can't get rid of these waves without spending another 50$ to maybe fix it.
Would this chassis work for a 19 inch monitor.
They do sell these in different flavours. There is one that works with 13 and 19 inch tubes.
Where do you connect degaussing coil to this chassis?
You don't. It's not supported. You need one of those degaussing wands if you're going to be using these.
@@pcbjunkie1 Thanks!
def interested in that pattern generator
@Colin Yael you're right i dont care.
These chassis are utter garbage. Mine came with the B+ pot broken! Fake Nippon Chemicon caps all around it’s pathetic... I got a picture but blooming was atrocious and contrast was all over the place. Needless to say it went back right away for full refund! (And that alone was a minor miracle!)
Yeah, it can be bad on some games with bright colors. I got a couple more of these and I'm going to experiment a bit. See if I can figure out a way to make them a little better.
Nice! I want to do this exact thing to a few TV sets. I just want to have a 25" vertical and 25" Horizontal JAMMA cab. I actually have a Virtua Fighter 2 cab with a 25" STD/MED res monitor with a dead chassis but if I get it working I hate to butcher the machine.