Main > Monitor/Video Forum
Working with a consumer CRT, can I hook it up to an arcade chassis?
pbj:
Just throw it out and replace with a TV that works properly and has better documentation.
bobbyb13:
--- Quote from: pbj on August 24, 2021, 12:25:26 pm ---Just throw it out and replace with a TV that works properly and has better documentation.
--- End quote ---
This-
Apart from an rgb mod, trying to use most Sony TVs is a PITA unless they have component input.
Zebidee:
--- Quote from: Oxiriarc on August 24, 2021, 10:02:16 am ---Unfortunately, I failed to understand a lot of the information on the Shmups board.
--- End quote ---
Go back and read again. I also got very confused when I first read that thread. Also, it is over 100 pages of fairly random RGB modding of different sets, so difficult to digest in one sitting.
--- Quote ---Most people said it was too old of a model and that I would need to do a mod on the hot part of the chassis,
--- End quote ---
There is no need to mod anything on the "hot" part of the chassis.
I've been looking at a schematic for the Sony 1926R.
The TV's jungle chip is CX20192. Can't find any datasheet on this chip, but seems to have no video inputs apart from RF. You might have some success injecting RGB via pins 17,18,19 which are the RGB outputs to the neckboard. Probably should use a video amp the RGB as it looks like schematic says it should be ~3.0 to 3.8vpp with a 1.9v average.
You could buy a video amp from Ultimarc or similar. With 75R resistors in series on the RGB outputs and 75R termination (to TV ground) resistors at the TV end, voltages would be about right. You could also try swapping the 75R resistors in series for pots (100-200R range) and precisely dial-in the voltage levels.
Not sure what to do with sync, maybe inject it to the jungle via pin 28 (which I think is where the RF video input normally goes).
I note that the OSD/text support chip on the TV only inputs to the green signal (pin 17), so RGB input via OSD method is not feasible.
Disclaimer: Neckboard RGB mods are a poorly understood method, so not much info out there. I've never done one myself, just throwing ideas out there.
--- Quote from: bobbyb13 on August 25, 2021, 04:01:17 am ---
--- Quote from: pbj on August 24, 2021, 12:25:26 pm ---Just throw it out and replace with a TV that works properly and has better documentation.
--- End quote ---
This-
Apart from an rgb mod, trying to use most Sony TVs is a PITA unless they have component input.
--- End quote ---
pbj has a talent for stating what everyone else is thinking. You'd have an easier time with another cheap or free TV, or an arcade monitor. If you are planning to showcase a game you are developing, it would be worth it.
Oxiriarc:
Well, I appreciate the advice.
--- Quote ---Go back and read again. I also got very confused when I first read that thread. Also, it is over 100 pages of fairly random RGB modding of different sets, so difficult to digest in one sitting.
--- End quote ---
I will revisit the Shmups forum, but I'm not sure I will get very far. I just don't have a lot of understanding surrounding the topic at hand.
I kind of wish I could pay someone to give me a detailed explanation of what I could do on my set.
--- Quote ---pbj has a talent for stating what everyone else is thinking. You'd have an easier time with another cheap or free TV, or an arcade monitor. If you are planning to showcase a game you are developing, it would be worth it.
--- End quote ---
I've been looking into this option, but I keep running into the same problems.
- people asking an unreasonable amount of money for it
- seller lives an extreme distance away
- it being a huge 27 - 36" tube (20" or smaller sets seem to be quite scarce where I live.)
I really wish I could get a decent arcade tube, but they are either way out of my budget or very badly burned/not in working condition.
Overall, I think I am just asking for too much with what I have.
For now I'll stick with the Sony, I got it apart, and have been cleaning it up. I've been keeping my eye out for another 20" set I can move on to, hopefully I can luck out at some point and get something that would be easier to work with.
Zebidee:
--- Quote from: Oxiriarc on August 29, 2021, 11:23:04 pm ---I will revisit the Shmups forum, but I'm not sure I will get very far. I just don't have a lot of understanding surrounding the topic at hand.
I kind of wish I could pay someone to give me a detailed explanation of what I could do on my set.
--- End quote ---
I couldn't really say more than what I already have without actually seeing the TV and circuit board to check things out.
--- Quote ---I've been looking into this option, but I keep running into the same problems.
- people asking an unreasonable amount of money for it
- seller lives an extreme distance away
- it being a huge 27 - 36" tube (20" or smaller sets seem to be quite scarce where I live.)
I really wish I could get a decent arcade tube, but they are either way out of my budget or very badly burned/not in working condition.
Overall, I think I am just asking for too much with what I have.
For now I'll stick with the Sony, I got it apart, and have been cleaning it up. I've been keeping my eye out for another 20" set I can move on to, hopefully I can luck out at some point and get something that would be easier to work with.
--- End quote ---
Yeah, some people are asking for crazy prices for CRTs these days. Add "retro" in the description and an extra digit on the price! But at the same time, people leave them for free on street corners. You have to keep looking, classifieds, junk shops and so on, and get lucky.
Not so long ago I bought up 8 * 20-21" CRT TVs, "new-in-box", for around USD$65 each. Made for Thailand market (which is where I am). They have refurbished tubes and a new Chinese chassis that is easy to mod for component input (input pins are right there on the jungle chips). They work brilliantly with GreenAntz RGB to component transcoders, even better than a cheap arcade chassis.