Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up --- Bug Reports --- Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

  

Author Topic: CRT suggestions for vertical cab rgb mod  (Read 291 times)

0 Members and 1 Guest are viewing this topic.

MiteWiseacre

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 125
  • Last login:Today at 12:21:56 pm
  • I want to build my own arcade controls!
CRT suggestions for vertical cab rgb mod
« on: January 13, 2020, 06:52:28 pm »
So I hit a wall trying to get my little 20Ē diamond (Mitsubishi??) to run RGB.
Thereís a Toshiba 27a43c I can grab, any thoughts on this? I have a larger one of these and the picture is pretty nice. Not a bunch of info on modding these not reviews. Too large for what I want to do? I presume it can do the resolutions I need.
Should I keep waiting to find a curved Trinitron?

buttersoft

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 917
  • Last login:Today at 12:20:04 am
  • Is running at 15kHz
Re: CRT suggestions for vertical cab rgb mod
« Reply #1 on: January 14, 2020, 06:25:56 pm »
Errr, you haven't really said what you're trying to work with when it comes to a cab. A 27" tube is not going to fit into the same mountings as a 20" one did.

Was the 20" mitsubishi a TV, or a PC monitor? IF it was a TV, did you have a look for the same model of set and/or jungle chip on the Shmups RGB-modding thread? Or just ask for advice on there? Same goes for the Toshiba, of course.
https://shmups.system11.org/viewtopic.php?f=6&t=56155

Any old CRT TV from the 90's will be 15kHz, and will handle most of the resolutions needed for MAME. Personally i wouldn't go for a trinitron as i don't think they look quite right, only being curved in one direction.


MiteWiseacre

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 125
  • Last login:Today at 12:21:56 pm
  • I want to build my own arcade controls!
Re: CRT suggestions for vertical cab rgb mod
« Reply #2 on: January 15, 2020, 12:47:12 am »
Yah been doing my research on the SHMUPS forum, the 20Ē is a tv and this is all in prep for a build, do no cab built yet. I did grab the Trinitron and got a mod to work yay! Looks pretty nice, once I get it all cleaned up and sorted Iíll post the solution here. This TV is a 2002, not as curvy as a 90s model but nice geometry and colour. My goal here is to build a Contra like cab, did those have a 25Ē screen? Canít find proper details, but this will turn out much larger than stock now with this screen anyway!

MiteWiseacre

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 125
  • Last login:Today at 12:21:56 pm
  • I want to build my own arcade controls!
Re: CRT suggestions for vertical cab rgb mod
« Reply #3 on: January 15, 2020, 07:52:27 pm »
So hereís how I modded my Toshiba 27a43
Micon: OEC7074A
Jungle: TB1253AN
Found service manual here:
https://elektrotanya.com/toshiba_27a43c.pdf/download.html#dl

When youíre pulling the main board out of this set it can kinda seem fused in there, I ended up using a long Philips driver to undo the back of the buttons just to free everything up, thereís really only a clip in the centre and once you get it apart it pops in and out nicely. Was baffled for a bit.

I pulled a female vga socket out of a dead monitor and wired to the pins 1-R, 2-G, 3-B, 10-Ground (soldered a lead right across #6-10 maybe unnecessarily), 13-H, 14-V sync.
I used the components I had around instead of following the RGB Mux guide from the SHMUPS guys.
  VGA Red -> 75R (terminated to ground ) -> 75R -> 1uF cap -> W127 (same circuit for R,G&B)
W127 is a jumper that runs in the path between pin 34 on the Micom and pin 20 on the jungle (OSD red input)
W125 is green
W124 is blue
Pulled 5v from the RF input tuner. BPL goes to a cap C002, where I soldered onto the tuner side leg, ran to the blanking pin#19 on the jungle, the nearby R615 was a nice spot to tap in.
I combined my H&V sync  -> 75R terminated to ground -> composite #1 Y input. (Tried Luma on svideo with no luck)
Put it all on a switch. The osd is sort of useable, just very faint unless I hit the switch and turn off blanking, would probably be easier to read if I had followed the mux instructions properly.
Works very well, offset to the right is all but Iím researching that problem still.
Now to work on a frame and vertical mounting...
 
« Last Edit: January 15, 2020, 07:56:42 pm by MiteWiseacre »