2 working chassis, 1 working neckboard

malinman

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Recently purchased a working Tekken 4 cabinet, which played fine until the green video gave out completely.

Took apart assembly and examined the neckboard and found it to be fried, looks like a overheating problem (same as here: http://forums.arcade-museum.com/showthread.php?p=1081298). The old chassis is a P763, neckboard P719.

I had a newer TV sitting around and scavenged the neckboard and chassis. It is a Phillips 25PS40 - Chassis 25T800 with bundled neckboard.

Can I substitute the neckboard from the new Philips with the old chassis? If so, what is the wiring configuration? Looked everywhere for a manual for the 25T800 without any luck.

Or, should I swap the whole philips assembly in?

Some photos:
Old chassis + neckboard:
7hHLH.jpg


Old neckboard:
MPiw3.jpg


New neckboard:
DdRJz.jpg


New chassis:
C9RC2.jpg



Can I connect these 2? Old chassis + new neckboard:
f75Xs.jpg



Hope this makes sense, sorry am new to all of this. Am being helped by my friend who is a professional electrician, so I've managed to not zap myself too many times while taking everything apart.

Thanks!
 
In my opinion you will be much better off salvaging the original neckboard. The scorching you are seeing is common place due to the transistors running very hot. In fact, the factory knew that they ran hot and that is why the large heat sinks are there.

The replacement neckboard will need to be rewired exactly like the one you removed. It is doable but it will likely be a ton of work and, since you have to use the same parts as were used on the old neckboard in order to rebuild the circuit this board will scorch quickly. I doubt the TV neckboard wil hold up to the heat as well as the old neckboard.

BTW, I am pretty sure the chassis you have there is a Wells Gardner U2000. The manual can be found at this link.

http://www.wellsgardner.com/service/
 
Yep, it makes sense but no you can't do it without driving yourself crazy. See if Chad at arcadecup.com has a few of the neckboards left over for that chassis. Give him the neckboard part number. You will have to resplice the wires that were cut inremoving the neckboard from the old chassis and use several layers of heat shrink tubing on the splices.
 
No, just stop....

It would be much easier to repair or have the one you have repaired.

And beings that you "cut" two wires that easily "unplug" makes me nervous.

EDIT: You guys are quick.
 
Chad should have new replacements for this neckboard and i wouldn't even bother with that measly thing you've got there. You'll spend hours trying to hook it up and it'll be toast in less than that.
 
Did your electrician friend advise you to swap the parts? Electricians are not the equivalent of electronics technicians. It is kind of similar to asking a dentist about performing heart surgery. Sure, the dentist is more qualified to answer your question than a 20 something plumber's assistant but not much...
 
Did your electrician friend advise you to swap the parts? Electricians are not the equivalent of electronics technicians. It is kind of similar to asking a dentist about performing heart surgery. Sure, the dentist is more qualified to answer your question than a 20 something plumber's assistant but not much...

This is so true.
 
if you end up getting a replacement chassis or replacing the monitor lmk, id love the old chassis(wells one)


been on the hunt for a repairable 7400 chassis for awhile now.
 
Thanks to everyone for the amazingly fast responses and advice, will try to salvage the old board or get a replacement.

Think it's likely that I'll be able to fix this with some careful resoldering or am I probably looking at needing to replace components as well?


Using the other chassis and neckboard was just an idea that sounded good on paper, but clearly wasn't practical. Electrician friend mainly helped me with discharging flyback capacitor.

Will let you all know how I get on...
 
Fixed

Hey, nerds! Just thought I'd let you all know that the infamous "electrician" fixed the board. Resoldered and good as new. Maybe I'm not as useless as all of you thought.
Don't assume that just because we call ourselves electricians (because that's what we do as a career) that we don't have a clue about electronics. Some of us, who have gone through proper training, including; electronics components, board circuitry, and many other relevant classes HAVE a clue as to what we're doing. We're not all "rafter monkeys" who just know how to pull a piece of romex from point A to point B.
Sorry that this response took a while to post, but unlike all of you, who responded within minutes, I have a life. Do you all know what that is? You know; friends who you don't meet in a chat room, jobs that require interactions with people that aren't limited to "Would you like fries with that?", and oh, yes, women....you know, nerds, like girlfriends, maybe even WIVES. I know all you virgins are staring at your computer screens saying " huh?, what's this guy talking about?" But I just thought I'd point out that there's life outside your parent's basement and there are people, whom you feel are inferior, who are, in fact, just as good as you all are when it comes to this stuff.
 
That was the funniest first posting of a new member ever.

You'll be surprised to find out that most of us here are well into their 30's or 40's, married or having long-term relationships and have kids. Just like the people judging you over "just" being an electrician, you judge to quick over us.
 
Was kinda astonished at that first post......speechless almost....but considering I just got home from witnessing my first grandchild being born I think I'll get over it.
 
Thanks for the praise...I think.

Thanks guys, for the "LOL"'s. Hope you all know it was all in good fun. All kidding aside, the help that my friend and I received on this site was VERY helpful and guided us on our way quite nicely. If we have any further problems with the Tekken 4 machine be sure that this is the first place I'll look.

BTW- Would installing some sort of "cooling" or "circulating" fan inside the cabinet do me any good? If so, any suggestions? Just trying to prevent it from happening again.
 
fans

It wont hurt, but i used to do this to certain games when they were on location making money and were on 18 hours a day(50 inch mitsubishi monitors for sure), not in homes were they might be on a hour or two, once in awhile unless your having a party. Usually once a game is in the home you should not have to worry about heat build-up.

I always had problems with most engineers over the years putting me down when they find i am a lowly electronics tech. I went to a place to buy 3 cocktails. ms pac,galaga,lady bug. The 3 engineers who work there could not fix them and were actually laughing at me, thinking how a dumb ass tech could fix them when they could not and they said this to me in front of their boss as he laughed too. Well since they thought they were basket cases i offered $25 apiece. They laughed at me and took the money. 10 minute ride home, 20 minutes to fix the games and then i placed a phone call to the company and talk to the boss with the 3 games going in the background and said i already fixed the games and you help me make a quick $2000 and you and your engineers could go fuck themselves!
PRICELESS!!!
 
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