OFFICIAL (Raven) Panasonic 7" LCD Monitor Thread

[Raven]

I just upgraded one of these to an LED backlight last night. The CFL tube was shot, so I needed to fix it. Those little tubes are L-shaped, and about the size of the ink tube from a Bic pen! I used a strip of bright white LEDs and pulled 12V from the pins on the power connector. Work great, and shouldn't have to worry about it burning out again.

 

[FedExin]

I'm using an arcade switching power supply without a power switch, how to I tickle the thing to turn on?

 

[SaminVA]

I'm using an arcade switching power supply without a power switch, how to I tickle the thing to turn on?

More info needed but If it's an ATX type power supply then jump the green and black wire to turn it on.

 

[FedExin]

it's this type of PS.

 

[modessitt]

Apply +12 for power to the proper pin, ground to another pin, and +5 to another pin if you don't want the image stretched widescreen. There's pinouts posted somewhere here.

Without a power switch wired in somewhere, it'll always be on when plugged in...

 

[FedExin]

I swapped the PS with a different one I scrounged up and viola. This is so cool!

 

[FedExin]

Could this be rigged to work with a game that has both horizontal and vertical sync outputs?

 

[modessitt]

Separate sync? I rigged up an adapter for converting separate sync into composite sync, as well as converting positive sync into negative sync - for bench testing.

I tried looking into whether it would accept vertical sync bases on some wiring diagrams, but that seems to be something separate from the monitor...

 

[Nephasth]

Thought I'd bump this...

Finally got around to putting some of the pieces together for my portable rig. Pretty happy with these little monitors!

 

[Phetishboy]

Followed the schematic, hooked it up to a switcher and Jamma board and can barely see anything. If I look real close I can see diagonal sync lines rolling, so I know it's getting power. No amount of adjusting does any good. Never gets any brighter.

 

[modessitt]

Which power voltage are you using?

 

[modessitt]

Followed the schematic, hooked it up to a switcher and Jamma board and can barely see anything. If I look real close I can see diagonal sync lines rolling, so I know it's getting power. No amount of adjusting does any good. Never gets any brighter.

Also, which JAMMA board? I've noticed that a few boards just don't display properly. Try a 60-in-1 if you have one...

 

[Nephasth]

To help try to clear up a little confusion over the schematic, here is a simplified pinout showing the only area of concern from the schematic. You'll find the first and last pins of each header are marked on the monitor PCB just as they are in this pinout. I used 5V (switch controlled in my test rig) on the 4:3 pin to get a 4:3 aspect ratio on my monitor, so labeled it as such in the pinout (but it is completely optional).

 

[Phetishboy]

I got it thanks to Nep. It was the FG label (that someone mentioned it could be) on the earlier schematic that threw me.

 

[demogo]

Ugh, necro-bump here.

I finally got around to doing something with this monitor and spent a bunch of time whipping up a bunch of cables to hook it up various ways to different power sources.

I tested it with my TPG and it synced and everything looked good from my switching power supply.

This last time though I broke out the el-cheapo switcher I bought a couple of years ago and had never tested and checked carefully to make sure that the voltage output was good and hooked the monitor up to it. All was well!

Except I left it on for a few minutes on the "falling blocks" screen and I was getting some flicker on the very bottom as the screen filled up. I watched it and after another 30 seconds or so the screen lost sync and began rolling horizontally. Eeek!

I moved the TPG back to my Spy Hunter and it was fine there so I came back to the 7" screen and hooked the TPG up to it again and this time it was fine. But a minute later it started the sync issue again. At some point after 30-45 seconds of rolling it'll quit rolling but the image looks distorted (stretched like it's not synced right).

Thoughts, anyone? Am I really only going to get 10 minutes of use out this 7" monitor before junking it?

 

[demogo]

The only things I can think of is to try the 7" monitor with another video source and try the TPG on my Spy Hunter / G07 for 10-15 minutes to make sure it's truly the monitor and not the TPG.

 

[demogo]

No one has any ideas at all?

 

[SaminVA]

Just wondering if anyone has ever used one of these Panasonic 7" LCD Monitor RGB monitors. I cant believe it's been 9 almost 10 years. After my first tests with these monitors I put them in a box and they have been untouched till today. Back then I had got them working on a few JAMMA games and they seemed like they would work for a portable test JAMMA setup which was a project I never got a round to. The monitors only worked with negative sync which is fine for JAMMA. At the time I only had a MT830A monitor signal generator which would not sync because it was positive sync only and this is before the TPG but it did display a color picture with no sync. You can see it in the 1 of the 3 videos I made back then.
Well jump forward to today and I dug out the 2 monitors as I had a little project to see if I could make them work as a test monitor. I have been testing a set of Bally Midway card rack test cards which has either B&W composite video out or color component video. The test boards work with the B&W composite video but I want to try the color out to a monitor. I don't have a monitor with component in so I figured I would just use the RGB board in my GORF game and connect it to the Panasonic 7" LCD RGB monitor which I figured should work as GORFs monitor is a WG K 4600 with negative sync so I connected it and nothing, a blank screen. I then tested it with a couple JAMMA games and it works with both a JROCK multi Williams and a NAMCO Classics II, just 2 games I had close by. So I next got out my TPG and connected it to the Panasonic 7" LCD RGB monitor and nothing, It was dead so I then connected the TPG to my GORF monitor and it had a excellent picture as I had not long ago installed a cap kit.
So not sure what's going on. I guess it doesn't like the video out of the GORF RGB board or the TPG but it's funny I did get a color picture with the old MT830A monitor signal generator, it just had the wrong sync signal and the JAMMA games seem to work
Any ideas? I am thinking it's a signal level/sync problem.
Here's the old videos I did 10 years ago if any one is interested.

 

[demogo]

Sam,

I've tested that same monitor with my TPG and it worked fine. It's been a few years, but it definitely worked. If it's not working with your TPG then it's most likely a dip switch or cable issue?

 

[SaminVA]

Sam,

I've tested that same monitor with my TPG and it worked fine. It's been a few years, but it definitely worked. If it's not working with your TPG then it's most likely a dip switch or cable issue?

That was my first thought but I have checked it over and over and it looks correct. I'll look it over again and wire it up direct if I have to, it's wired up thought a JAMMA harness right now. Might dig out my old MT830A and see if that still works like it did in the videos. It's got to be something stupid.