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Try the brightness POT R535 25Kohm on the neck board.
Check this connector on the neck board. If it is not connected, a super bright picture
D501 on the neckbeard open?
D501 on the neckbeard open? Should measure close to 180v on both sides.
Also, from the FAQ:
• R515 (broken wire to R531)
• C503 (reversed; may toast R527)
Check the wiring very carefully, particularly the red and white wires going from the back of the HV focus and screen adjustment knob block, to the neck board.
Pull the rubber boots off the back of the block. Pull the red and white wires off and pinch the connectors slightly to make sure they fit on the posts snugly, then replace the wires and boots.
Check the red and white wires where they go into and out of the 2-pin molex on the HV cage. They often break inside the connector (where the wires meet the pins), and are hanging by a thread. Disassemble and solder them back together if necessary.
Also, check where the red and white wires connect to the neck board. The red one often breaks where it connects to the board. The white one goes into the neck connector, but you can pop the end of the connector off and check it.
D501 on the neckboard open? Should measure close to 180v on both sides.
Also, from the FAQ:
• R515 (broken wire to R531)
• C503 (reversed; may toast R527)
If it's a spring, it's the dag spring, not the degaussing coil. Two separate things. The degaussing coil plugs into the left rear corner of the deflection board.
The dag spring is the ground for the tube. That's important. You don't want to run the monitor without it. You can make a new one with just a piece of the old spring (even a short rusty one) and some solder braid. I've repaired a few this way.
Yep thats what it is and I should have said....grounded to the chassis next to the HV cage. It looks like it hasn't been able to carry an electron for several decades as most of it is dust.. Could it have damaged other components being on without it?
You just need to find a small piece of spring, roughly similar to the old one, maybe take one off a dead TV, or find one somewhere. You just need it to hold a little bit of tension, then you can make a new ground strap out of copper solder braid/wick.
Stretch the solder braid across the tube, fasten it to the frame on one end (any way you can), and use the spring on the other end to hold it tight against the tube.
In Bill's pic he mentioned this connector being off and you saying it was on.
I just rebuilt both the deflection board and the HV recently and while moving this connector one of the wires just FELL OUT. When I went to test the other, it popped out with barely any tension. I re-pinned and everything was AOK.
Do you have another color vector game that you can swap monitor to isolate it? Kinda looks like a Tempest PCB problem but not 100% sure on that.
Andrew