I'm stumped on this one.
This one had a burned up diode at D605. I replaced it, and upon powering it up, it squealed like a pig. I replaced all the caps, and the HOT Q604. Powered it back up, and it blew the HOT again and squealed like a pig. I removed the flyback and powered it up and it was quite. So..replaced the flyback FN-1441B and the HOT again and now it powers up. I hear high voltage and static electricity in the tube. However, there is no picture, even when I turn the screen knob up on the flyback. Also, the neck does not glow orange, so I don't believe the heaters are working. I checked voltages on the back of the neckboard at CN501.
Pin 1: 11.5V, should be 12
Pin 2: 4.5 clamp
Pin 3: 2.0 contrast
Pin 4: 0.2...this is the heaters
Pin 5: -73.0V G1
Pin 6: 0V ground
Pin 7: blank
Pin 8: 138V, should be 180.
I checked R704 and R701. They are good. Not sure why the heaters don't have any voltage.
I can use any suggestions.
Clay
This one had a burned up diode at D605. I replaced it, and upon powering it up, it squealed like a pig. I replaced all the caps, and the HOT Q604. Powered it back up, and it blew the HOT again and squealed like a pig. I removed the flyback and powered it up and it was quite. So..replaced the flyback FN-1441B and the HOT again and now it powers up. I hear high voltage and static electricity in the tube. However, there is no picture, even when I turn the screen knob up on the flyback. Also, the neck does not glow orange, so I don't believe the heaters are working. I checked voltages on the back of the neckboard at CN501.
Pin 1: 11.5V, should be 12
Pin 2: 4.5 clamp
Pin 3: 2.0 contrast
Pin 4: 0.2...this is the heaters
Pin 5: -73.0V G1
Pin 6: 0V ground
Pin 7: blank
Pin 8: 138V, should be 180.
I checked R704 and R701. They are good. Not sure why the heaters don't have any voltage.
I can use any suggestions.
Clay
