New in the box WGE1972-H0GS39L no video

local413

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Just pulled this out of a warehouse where it's been sitting in it's original box since 2003-2004.. Box had been opened, but this monitor looks new..

Pulled it out, checked the fuse. Testing this on a working game.. Here is what I'm getting.. I hear the monitor click on, don't hear any degauss or static, I do see glow from the neck.. NO VIDEO.. Checked the voltage on the 12v and 24v test points.. the 24v is 21-22v and the 12v is spot on.

There are a few pots on the chassis that have been sealed from the factory, didn't mess with them. Did try adjusting the B+ but nothing happened.. Not very familiar with these newer monitors.. aux adjustment pcb is hooked up..

Man, this is as new as they come.. I hope it's an easy fix :)

THanks for any help..
 
What game are you testing it on? How are you powering the monitor (plugged into the wall or plugged into the cab). Turn the brightness up on the flyback and check if you have raster. Any neck glow? What's the b+?

EDIT - fuse good I guess? Is this a 7201 or 7203?
 
Answers..

I've tested it on (2) games, time pilot and jungle king. Using the game's monitor power connector to get power (using iso) heh not into the wall.

Yes, I've tried the brightness no raster. Yes, there is neck glow. I'm not sure where exactly to meter the b+. I have checked the 12v, 8v, and 24v.. 24 is 22v.

Fuse is good. This is a 7203. I've downloaded the quick fix guide from wells and checked the diodes, all good.. Haven't checked the IC or cap.. But look ok.

Thanks for your help sir.
 
The 7203 doesn't need an ISO, which is why I asked how you were powering it.

If it works, you should be able to plug it into a wall outlet, turn the brightness up and see raster. If you don't then you have a problem. Check your B+ first. It's probably high. If so, look it over for cold solder...
 
BTW - I'm sure the yoke connector is on properly, and the neckboard is on good? Anode cup has been checked to make sure both pins are in the hole?
 
Next :)

Sorry, so used to going with an iso I didn't even think not to.. I've pulled the cup off a few times.. Each time, I'm not getting any pop or discharge.. Testing the b+ now.. All the way up: 125v and turned down 120v or less..
Took me a good half hour to scrape off all the glue on the b+ pot :(

Monitor is plugged into the wall..
Neck board is good, glow from neck
Cup anodes are securely in tube
Solder looks new throughout the chassis..

Is the B+ too low?
 
Humm..

Man, this is frustrating.. Such a beautiful monitor, and no video.. Guess this is why it's been sitting on the ops shelf for years.. Heh.. Not gonna give up on this one though.. Seems like if I'm not getting any discharge from the tube, that would mean it's not getting the juice it needs (laymens terms). Could the fat cap on the neckboard be dead?

Yet I'm getting some glow.. Weird.
 
You probably won't get a discharge because the 7203 has an auto-discharge feature.

The obvious thing to do is check to see if you have any B+. The 7203 has the isiolation built in. This means the power supply section is separate from the deflection section. You need to find out which section has the problem.

If you do a search for a 7201 repair thread I have here somewhere, you'll see a way to isolate the power supply using a lightbulb or lamp as a load. This will tell you if the power supply section is functioning properly. If so, then we can go on to the deflection section. if not, then we concentrate on the power supply...
 
Ok.

Not sure if you missed it, but ive tested the B+ and cleaned the glue off the pot to adjust it. 125v turned up and under 120v turned down..

So does that rule anything out?
 
Get the voltage-checks chart from WG's support site and see what voltages you are getting at the chips...
 
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