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[ChanceKJ]

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[yotsuya]

Anyone following my other threads will know that today i picked up a used WG D7700 arcade monitor for one of my projects.

Now i've gotta figure out how to get this thing going. As expected there would be some problems with it.  I've spliced in a new power cable (as this monitor does not need an isolation transformer) and plugged it in. I heard a quick hum noise as if the monitor was powering on, however nothing is no the screen. I've tried hitting the OSD button on the controls but nothing is coming up. not even a "No Signal" error. 

I've tried searching on KLOV, and here on the BYOAC, however i've not found anything relating to this issue.

WG's site has spec sheets, schematics, and a board layout manual.
https://www.wellsgardner.com/service/

But there doesn't seem to be a troubleshooting manual anyplace.

Ideas?

Do you have anything conneted to it.

[ChanceKJ]

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[ed12]

with it plugged in
look at the back >neck< of the tube,by the neck board and see if u are getting a orange glow,.? if so u have high voltage,if so then try turning up your screen control.
if no neck glow then no high voltage,trouble shooting start's

ed

[Ken Layton]

I don't think anyone makes a capkit for this model yet.

[ChanceKJ]

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[ChanceKJ]

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[ChanceKJ]

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[ed12]

yes that is what is called starting to sweep up..ie give u deflection,
with it dying back out >slowley< i would look at bad cap/cap's
as something is putting a load on the flyback,enough to cause it to shut down,
i would not expect a blown transistor,leakey maybe ? but not shorted,
on them smps style unit's,on the cold side find the b+ test point's,and find out which 1 is going down first,then proceed to go through that part of it
so in this order
if your 22volt's is holding,then u can be sure that is not your problem area
same with 12volt
then it leaves u with the high volt 125-145 it will list the value
so with a few multi meter test's u can decuce what area u need to foucs on..

yes the screen control's are glued in them unit's >fixed<,why i have no idea

ed

[ChanceKJ]

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[ChanceKJ]

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[ed12]

time for a cap kit
that may just fix er right up

ed

[ChanceKJ]

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[yotsuya]

Yeah,  just shotgun that mofo when the caps arrive. Make sure you put them in correctly!

[ChanceKJ]

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[yotsuya]

don't worry, we'll talk when they show up. time to bone up on my soldering iron skills.

Maybe i'll go find an old broken thing around the house i can play operation with.

You have a desoldering gun/iron? Best thing ever in this hobby.

[ChanceKJ]

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[yotsuya]

I cut my cap kit teeth on wick, but I wouldn't wish that on anyone. Get the gun, you'll be happy.

[ed12]

when u get the cap kit in and all is good
i will give u a common problem fix for them chassic's ,that  will save u $$$ in the long run..

ed

[ChanceKJ]

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[Expressline99]

I'm surprised no one responded. I'm not amazing at soldering but I've cleaned up things like this on pinball boards. If it didn't wreck any pads you should be able to remove and clean it up...and replace no problem. But of course I'm not sure what caused it so it might happen again.

Not sure how to trouble shoot it.  But I'm curious what you've done since the post.

[MonMotha]

Can you tell what area of the monitor circuit (i.e. what functional block) that's in?  Looks like you had some transistorblowen going on.  Tough to tell if the blackened resistors and capacitor are actually a (probably related) failure or just the result of that transistor losing its magic smoke.

[ChanceKJ]

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[Expressline99]

Did your PCB friend get all the burned stuff fixed?

[ChanceKJ]

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