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CRT Monitor Black Screen Issue

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alfa75 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alfa75 Quote  Post ReplyReply Direct Link To This Post Topic: CRT Monitor Black Screen Issue
    Posted: 02 Jun 2022 at 6:58pm
I‘ ve a strange issue wirh my CRT Montor. Some Games like Aero Fighters and also MVS works, but Game Elf, 60 in 1 and Crazy Kong shows onyl a black Screen. Here are a picture from the tube and also from the chassis. It runs on 128V.

Anybody has an idea what the issue could be?




Edited by alfa75 - 02 Jun 2022 at 6:59pm
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Monstermug View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Monstermug Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2022 at 7:44pm
Might be 31k only?
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alfa75 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alfa75 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2022 at 8:40pm
Originally posted by Monstermug Monstermug wrote:

Might be 31k only?

This could be an explanation. Would it be possible to convert the signal from 15k to 31k, Respectively how would it be possible to play crazy kong on this monitor?
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Retroman839 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Retroman839 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2022 at 8:43pm
If your playing neo geo
Your good for 15khz

I would look at sync & ground.
And if the dips are set correctly on the
Game elf / 60 in 1    Game elf I think came in 2 flavors 15 & 31

60 in 1 has dips for 31 -15khz

Crazy kong pinout I’m not familiar with. will be 15khz but where sync & ground are I don’t know
I’m not sure if it’s jamma or pre jamma

Like have you played these other games on this monitor before?


Edited by Retroman839 - 02 Jun 2022 at 8:54pm
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alfa75 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alfa75 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2022 at 7:18pm
Originally posted by Retroman839 Retroman839 wrote:

If your playing neo geo
Your good for 15khz

I would look at sync & ground.
And if the dips are set correctly on the
Game elf / 60 in 1    Game elf I think came in 2 flavors 15 & 31

60 in 1 has dips for 31 -15khz

Crazy kong pinout I’m not familiar with. will be 15khz but where sync & ground are I don’t know
I’m not sure if it’s jamma or pre jamma

Like have you played these other games on this monitor before?

Now it’s works. Thanks to your tips, what I still have is a purple image on one side. I don't have a speaker or anything there, but I suspect it's the monitor.





Edited by alfa75 - 03 Jun 2022 at 7:22pm
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Retroman839 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Retroman839 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2022 at 7:40pm
Need to demagnetise your screen

You have been moving it around disturbing the magnetic field.

You must either have no auto degausse usually automatic on power on.

Checks it’s plug-in on chassi it will be coming of the thick wire that goes around back of the screen.
With a double socket similar to the yoke wires.    Connectors.
Don’t put screen near anything magnetic like speakers
Hanterex similair to power molex jack

Or you need to buy a hand held degausse

Yeh all the Color’s around the edges of your screen are all out of wack like the colours of the rainbow

Other than that crazy kong looks mint mate


Edited by Retroman839 - 03 Jun 2022 at 7:46pm
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