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Help Installing New 20” CGA Monitor


Hashman

Question

My 20” Xybots arcade machines chassis has died and I have a spare new screen and chassis I want to put in.

 

No wires are attached to the tube and I don’t know where to solder the wires to.

 

Hoping someone can tell me from these pics?

 

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Thats a 18" cRT Tube

 

Shit maybe it’s too small then. Bought it years ago as a 20” replacement.

 

Have a 19-20” in a cocktail at work. Maybe I’ll just rip that one out and use that.

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Thats a 18" cRT Tube

Multi meter will help out reading the ohms..

Top 2 are H

Bottom 2 are V..

double check the reading via multi meter ..

 

Sorry Leo. Just re read your post. Didn’t realise the chassis connector says h and v.

 

So I just connect up all four wires? H’s up top and V’s on the bottom and I just swap wires around if screen is flipped the wrong way?

 

Been 10 years since I’ve replaced a screen in an arcade machine. Sorry for full boar noob questions.

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As long as the right two wires go to the vertical coil, and the right two to the horizontal, it'll be fine. You can swap later. The v-coil will have the higher resistance across it.

 

EDIT: half a mo, the sticker says A46, doesn't it? That's a bit weird, given an A48xxxxx is normally a 48cm visible tube. Leo was probably right to jump on that. I think if the h coil measures 1.7R to about 2R, and the v coil 14r to about 15 R, you should be fine to power it up, at least, if the chassis is designed for a normal 48cm/19" tube. Can anyone confirm that?

Edited by buttersoft
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WEll, the 51cm tube is going to be bigger, and will have different readings. Most LAI lowboy, for example, would fit a 51cm tube if you widen the mounting space a tiny bit. You can even use the same bezel if you pull the visible size in a bit at the edges.
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Mate when people say 20" in an arcade machine they are usually 19"

All my dedicated cabs have 19" 48cm tubes.

 

Yer, this. Aus 20" is US 19", normally called 19" when dealing with arcade. And 19" is a tube starting A48xxxx (or possibly M48xxxx) that has a 48cm-diagonal visible picture. The A51xxx tube is US 20" or Aus 21"/51cm diagonal, but it'll be marked for US 20". And this is why Leo jumped on that A46xxx marking - i've not seen it before.

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Yer, this. Aus 20" is US 19", normally called 19" when dealing with arcade. And 19" is a tube starting A48xxxx (or possibly M48xxxx) that has a 48cm-diagonal visible picture. The A51xxx tube is US 20" or Aus 21"/51cm diagonal, but it'll be marked for US 20". And this is why Leo jumped on that A46xxx marking - i've not seen it before.

 

I just pointed it out because Hashy seemed to be getting confused.

 

I've discarded so many 21" screens, you can adapt them in generic lowboy cabs by doing a bit of hacking for for dedicateds they are next to useless.

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I just pointed it out because Hashy seemed to be getting confused.

 

I've discarded so many 21" screens, you can adapt them in generic lowboy cabs by doing a bit of hacking for for dedicateds they are next to useless.

 

Oh, i was agreeing with you :)

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Success! Put the 19” in and will send chassis for original 20” to get fixed.

 

Took ages mucking with convergence but got it right in the end.

 

Thanks heaps for everyone’s help.

 

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