Old WG Monitor Fizzles Then Resizes Screen **Resolved!**

[grantspain]

sounds like the flyback but it could also be a fault in the deflection circuit,first id this chassis correctly

[grantspain]

very rare for an isolation transformer to go faulty
easy way to prove it though-just meter the output voltage and if you get a steady 110-120vac then its fine
the fault is most likely flyback transformer or even hot,you need to check for bad solder joints first around the chassis
yeah it is a wg k7000 series chassis and its around 18 years old

[grantspain]

hmmm yeah i see what you mean,i do remember that strange old flyback
your best bet is to post on byoac as i am sure they know the score with this,to me there is no way that new flyback is compatible
edit-craig(ordyne) will know this

[grantspain]

whats the original flyback part number?

[grantspain]

yes i remember seeing something about that a long time ago,maybe you can pick one up on ebay or go for a replacement chassis from alva amusements as i think the price for a new chassis is pretty cheap
you would need to read the yoke resistance,supply size of tube,amount of pin on crt neck

[grantspain]

yes i think so,read the yoke resistance
red and blue are the horizontal pair
yellow and green are the vertical pair

this is the best way to match a chassis(even better if you read the inductance but you need a lcr meter for that)

[capcomguru]

Just wanted to add in that I fixed a 100% dead WG K7000 chassis this past weekend simply by reflowing the solder. The monitor wouldn't even power up prior to me working on. I'd start there if you haven't already.

[grantspain]

i would keep the iso in there

[grantspain]

post a photo of both your old tube neck card crt socket and the new one

[grantspain]

there are 2 yoke connections on the chassis-use the other one

[grantspain]

ok then the other option is to use the original yoke connection but you need to reverse the wiring
where it was red/blue/green/yellow now you need blue/red/yellow/green
if you have to cut the plug in half then do so
NEVER EVER GET THE PAIRS WRONG---never put the blue and read onto the yellow and green connection,although you will see that the red/blue pair is more spaced than the other pair on the plug itself

[grantspain]

cool,good info as well

[Devil Soundwave]

Just checked my monitor and it's a Wells Gardner as well (19K7698) and appears to have two wires going to the anode, so I guess that means I have the cack-handed Zenith model as well...

Doh!

Thankfully still working nicely at the mo.

Not sure I could replace a chassis though, so if it ever dies, I guess Craig will be making some cash...

[grantspain]

Not sure I could replace a chassis though, so if it ever dies, I guess Craig will be making some cash...

if you attend one of the monitor talks at Insert Coin 09 you will learn all you need to replace a monitor chassis

[Devil Soundwave]

Not sure I could replace a chassis though, so if it ever dies, I guess Craig will be making some cash...

if you attend one of the monitor talks at Insert Coin 09 you will learn all you need to replace a monitor chassis

Nice plug Grant! lol

You know, I just might turn up.