Need Help With MVS Monitor / Picture Issue

incrediblehark

incrediblehark

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May 3, 2006
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So my wife surprised me with a Neo Geo cab this year for my birthday, and I'm enjoying every minute of playing it, but I seem to have one problem. The very top of the screen is distorted a little, just a few lines. everything else with the monitor and board appear to be fine except for that. And its not a big deal, more of an annoyance. for example i can't see my score or name input in certain games. The guy who sold her the cabinet (who turned out to be a member on these boards) told her that the monitor was just recently replaced or refurbished, I'm not sure which. I've attached some pics to show what i mean, sorry if they didnt come out too well. If you need any more info let me know, hopefully someone on here knows what the problem is and if theres a fix. Thanks for looking!

PICT0038.jpg


PICT0039.jpg


PICT0042.jpg


PICT0043.jpg
 
SniperElite

SniperElite

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It is more than likely the vertical hold, located on the monitor chassis or your remote board. Adjust it slightly and you should be fine!
 
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buaku

Hardened Shock Trooper
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Yeah that's what I did with my monitor when it wasn't coming in properly. Lots of knobs that can be adjusted on the back. Should fix it up in no time!
 
incrediblehark

incrediblehark

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thanks for the input. I suspected it had something to do with the sync so i checked out the connectors on the chassis. there were 3 pins for sync and my connector only had 2 wires connected so i pulled one out of the middle pin and connected it to the 3rd and it worked!
 
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RookieRob

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Oct 31, 2009
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I'm in a similar boat, got a neo-geo cab for my birthday as well and the vertical hold trick helped me out but I have a problem where none of the red comes in. Could it be a bad transistor and if so how would I check or replace it? I'm such a noob when it comes to this thing since this is the first arcade cabinet I've owned.
 
incrediblehark

incrediblehark

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there should be some knobs in the back for red, green, and blue, you could try looking for something like that and make adjustments if you haven't already
 
grantspain

grantspain

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RookieRob said:
I'm in a similar boat, got a neo-geo cab for my birthday as well and the vertical hold trick helped me out but I have a problem where none of the red comes in. Could it be a bad transistor and if so how would I check or replace it? I'm such a noob when it comes to this thing since this is the first arcade cabinet I've owned.
Click to expand...

what monitor model is this?
most have colour drive transistors on the neck card and do suffer from bad solder joints,you would need to use a multimeter to prove a transistor and soldering skills to repair this
other things that cause a loss of colour are decoder ic fault/missing signal from game board/faulty crt gun or bent nect pin
 
R

RookieRob

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I have noticed the different knobs to adjust the colors and have tried adjusting them. When I turn up the red drive all the in-game colors meant for red remain black but my CRT itself becomes drenched in the color red giving a red tint to the whole picture. I'm not sure how to check what monitor model I have, how would I do that? There is also one thing I forgot to mention, there was a point where randomly the color red would come back when I would turn on the AC power and sometimes it would fade out again and other times when I would turn off the machine and turn it back on again the color red was out again. Unfortunately it won't show red anymore and I really appreciate the help because I am just completely lost on this whole thing and its so disappointing to not see all the colors of my games.
 
grantspain

grantspain

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if you take a photo of your chassis i can tell you which transistor to check,trouble is the symptons you describe point towards gun failure in the crt itself
 
norton9478

norton9478

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RookieRob said:
I'm in a similar boat, got a neo-geo cab for my birthday as well and the vertical hold trick helped me out but I have a problem where none of the red comes in. Could it be a bad transistor and if so how would I check or replace it? I'm such a noob when it comes to this thing since this is the first arcade cabinet I've owned.
Click to expand...

Did you make sure that the red signal was being sent to the monitor?

Also, it sounds like it could be a bad gun...

A rejuvenate would help.
 
channelmaniac

channelmaniac

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If it was a bad gun, it won't be drenching the screen in red, but would be very dim when cranked.

Could be a cracked solder joint on the inputs, bad wiring harness/connections between the board and cab, bad solder joint or cap in the input section, bad connections between the main board and neck board, or cracked solder joints on the neck board.

Whew.

Basically you have to track down where the problem is from inputs to the CRT tube to find where the fault is. One quick check would be to swap the red and blue lines on the inputs to the monitor. If the red color starts working and blue stops then your problem isn't on the monitor but on the board or in the cab's wiring harness.

If you are unsure of it and want someone to fix it, check with Chad at Arcadecup.com as he specializes in repairing monitors.

RJ
 
M

monads

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May 16, 2008
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I starting having a monitor issue with my MVS-U4 candy cab recently and was meaning to inquire but found this thread. I'm not sure it's even a monitor issue.

Basically I turn the cab on and the proper colors aren't displayed (orange/red). Color is there but the whole screen shows in a faint blue. Select a game and it gets corrected. The color issue happens randomly on power-on, and when so usually corrects itself when I select a game. But the other day it took a few more tries than normal to fix so I started to worry a component was failing?
 
M

MadmanMoyer

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Sorry I'm posting this under someone else's thread but this site won't allow me to start my own topic.

Anyway, I recently got a Neo Geo MVS 2 slot and was cleaning it up. I was having problems getting my monitor how I wanted it, so with the control board down I was tweaking the knobs for contrast, brightness, etc. Well, while the system was on I unplugged the connectors to that board to see if maybe I could clean those and see if that would help. When I plugged the one back in the monitor stayed black and there is not a beeping noise coming from the circuit board that connects the monitor. When I unplugged the fuse it stopped beeping so I thought that may be the issue. I bought the correct fuse and plugged it in and I still get the same sound. Does anyone have any idea as to what the problem may be? I googled it and cannot find anything. I definitely appreciate any help as I want to play this thing so bad!
 
M

MadmanMoyer

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When I plugged the one back in the monitor stayed black and there is not a beeping noise coming from the circuit board that connects the monitor.

Sorry, I meant to say there is now a beeping noise.
 
grantspain

grantspain

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MadmanMoyer said:
When I plugged the one back in the monitor stayed black and there is not a beeping noise coming from the circuit board that connects the monitor.

Sorry, I meant to say there is now a beeping noise.
Click to expand...
if you mean there is a chirping noise then thats says your monitor power supply is in trip-this could be down to a bad solder joint or bad connection-look at the remote board as this will cause the issue
 
Xionicist

Xionicist

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My apologies for reviving this old tech thread, but I wanted to comment on the original problem the OP was having an issue with.

I recently picked up a 4 slot Big Red with that exact same issue distortion issue. It still had the problem after adjusting the vertical hold and capping the monitor.

To continue to troubleshoot the issue, I stuck a known working 4 slot board from my Rev. 3 in the cab. Same problem. I stuck a 2 slot in the cab. Same problem. Tried a MV-1F. Same problem. Tried a MV-1C.... hey, problem fixed!

Now, I knew the problem couldn't have been with the boards, since they work fine in my other cabs without a hitch. It ended up being a failing power supply. My guess is that the compact MV-1C draws less power, and didn't have a problem with the nearly dead PS.
 
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