Monitor problem (updated with pics)

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Drewmantrivia

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The cab i'm looking at to buy is a vertical cab. The owner told me the problem is that the monitor screen now has shrunk to about 3/4 size. It shows the game still just "slimmed down". Any ideas of what could be wrong or what a fix could be for it? I don't get to see it till tomorrow so I don't have any pictures. I have to make the call to grab it tomorrow or it goes to the next guy that talked to him. Anyone got any advice for me?

Got the cab and here is what i get with it fired up. Is a cap kit the way for me to go and what is the model number of the monitor i should be using to find out what one to order?
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3060689779_8917577a22.jpg
 
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andy251203

andy251203

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If the pic shrunk on its own, then it sounds like it needs a cap kit.
 
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Drewmantrivia

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Ok cool. That is what I was hopeing to hear. That shouldn't be too bad then. Bob Roberts the place to go then for a cap kit or is there other guys that sell kits too?
 
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ShmengeTravel

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Yeah, that looks like a job for a cap kit. You may also need to replace a resistor or two, but try the cap kit first.
 
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IronGiant

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That's a deflection problem, no doubt one of the main deflection transistors has died. A cap kit may help, but only if it includes replacement transistors for the deflection circuit.

Email Bob Roberts and point him at these pics, he should be able to ID the monitor and recommend a suitable cap kit. His web site is here:

http://homearcade.org/BBBB/parts.html
 
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ShmengeTravel

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IronGiant said:
That's a deflection problem, no doubt one of the main deflection transistors has died. A cap kit may help, but only if it includes replacement transistors for the deflection circuit.

Email Bob Roberts and point him at these pics, he should be able to ID the monitor and recommend a suitable cap kit. His web site is here:

http://homearcade.org/BBBB/parts.html
Click to expand...

I agree, this could be the problem. The only reason I suggested the cap kit and resistors was because in my experience (although with a different monitor), it was a resistor that went bad and caused the deflection problem. I suggested the cap kit as well because I do see other symptoms in those pics that a cap kit should take care of and, typically cap kits go without saying. But yeah, let Bob take a look at the pics so he can hook you up.
 
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Drewmantrivia

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Thank you both for the replies. I e-mailed Bob and hope to hear from him soon. Question though. I know he provides a instruction sheet for installing the cap kits. Would he or does he also send the info on if need be, where and what resistors and transistors need to be replaced? i'll post pics if i can get it repaired. Thanks!
 
caleb1883

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Bob is the expert and you've already e-mailed him, but I just finished my own DK JR restoration, and you should know a few things about it.

One big one is that the video signal is inverted. It's weird and I think you can buy some type of adapter to allow you to hook up other games without un-inverting the video signal. You should check your machine, since it is not an orginal machine that I can tell, and see if it already has this adapter or if the video has been hard wired to be inverted. If it does not have the adapter, then do not expect to just start plugging other vertical games into it and have them work.

Two, the game has no built in test pattern for convergence adjustment. Supposedly once you re-cap it you won't really need to adjust it, but mine is just a little bit off, and I have not gotten a definitive answer on what to do from any internet source or board.
 
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buaku

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caleb1883 said:
One big one is that the video signal is inverted. It's weird and I think you can buy some type of adapter to allow you to hook up other games without un-inverting the video signal.
Click to expand...

Do you have any more info about this inverted signal? Like do you mean inverted as in left is right and right is left kind of thing? Or do you mean it can flip the video so a horizontal scrolling game would work right with a vertical screen?
 
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Drewmantrivia

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If i remember right the output from the Donkey Kong Jr board is inverted and needs a piece to convert that to a signal that the monitor can handle. There is a ton of stuff in the cab that looks to be the inverter and the power supply. I can snap a picture if you guys want and can tell me what some of it is. Most of it i'm guessing is going to come out as i'm going to drop a 1 slot mvs into it as i work on it.
 
caleb1883

caleb1883

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buaku said:
Do you have any more info about this inverted signal? Like do you mean inverted as in left is right and right is left kind of thing? Or do you mean it can flip the video so a horizontal scrolling game would work right with a vertical screen?
Click to expand...


EDIT: WRONG INFORMATION. Please scroll down for correction.
 
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buaku

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caleb1883 said:
Inverted as in the game will display upside down without the proper board. You usually have to have a special setup, but only Nintendo classic games with inverted signal will plug and play. So if you want to put in, let's say, Burgertime, you would have to remove the decoder board that you used with DK/DKJr and it's a big pain in the ass. Supossedly they make a board so that you just flip a switch and it's in invert mode, and then flip it again and you can run normal games.
Click to expand...

Crazy games!!! Wonder why they had to do that.

I'm looking for something to mirror a signal so I can flip the video for my 6-player x-men board, so that's why I ask.
 
caleb1883

caleb1883

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Don't know anything about the Xmen board, but I thought the original 6 man had two monitors?

EDIT: CORRECTION. I was wrong about the inverted video. What it means is that the COLORS are inverted in old Nintendo games, because the early Nintendo cabs used a Sanyo 20EZ, which stock runs inverted video. So Nintendo had to have their games output inverted to accomodate the monitors. That Sharp monitor, while not as common also has stock inverted video.

Why Nintendo choose these monitors I don't know. Maybe because they were cheap, or maybe because they have an onboard audio amplifier, and didn't require them to put and audio amp on the PCB itself.

So to sum it up, DK/DKJR/ and Mario Brothers all output reveresed colors. Black is White, Red Is Blue, Etc. The Sanyo EZ20 displays them in reverse. So if you were to plug in a normal video game to a Sanyo EZ20, your video would display with inverted colors. If you plug in a DK/DKJR/Mario Brothers board, it will look whacky with inverted colors. However, you put an inverted monitor with an inverted board signal and it displays normally.

Here is a more in depth discussion on it.
http://forums.webmagic.com/ubbthreads/showflat.php?Number=921870
 
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buaku

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That's pretty interesting there!

Yeah X-men 6-player had 2 monitors. One was set up normally, the other was flipped because the monitor sat in the belly of the cabinet and the image was reflected up. I'm guessing it was done that way to sort of hide the monitor edges and make it seem more like a seamless picture.
 
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Billy Hologram

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caleb1883 said:
Don't know anything about the Xmen board, but I thought the original 6 man had two monitors?

EDIT: CORRECTION. I was wrong about the inverted video. What it means is that the COLORS are inverted in old Nintendo games, because the early Nintendo cabs used a Sanyo 20EZ, which stock runs inverted video. So Nintendo had to have their games output inverted to accomodate the monitors. That Sharp monitor, while not as common also has stock inverted video.

Why Nintendo choose these monitors I don't know. Maybe because they were cheap, or maybe because they have an onboard audio amplifier, and didn't require them to put and audio amp on the PCB itself.

So to sum it up, DK/DKJR/ and Mario Brothers all output reveresed colors. Black is White, Red Is Blue, Etc. The Sanyo EZ20 displays them in reverse. So if you were to plug in a normal video game to a Sanyo EZ20, your video would display with inverted colors. If you plug in a DK/DKJR/Mario Brothers board, it will look whacky with inverted colors. However, you put an inverted monitor with an inverted board signal and it displays normally.

Here is a more in depth discussion on it.
http://forums.webmagic.com/ubbthreads/showflat.php?Number=921870
Click to expand...

i can imagine Mario being even more psychedelic with inverted colours haha
 
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