Hi everyone, I finally got back to the tv and it worked right away. Picture tube is very bright, the yoke turned out to be the only problem. The picture has a bit of distortion though. when a part of an image is white, relfecting or giving off light, everything right of the bright spot is black. Does anyone know what causes this? how to fix it? It is really noticable
Thanks

Ian,
I have worked on these sets. Maybe it's the positioning of your ion trap (if your picture tube requires one) or the centering of the picture. I think this can also happen if the HV rectifier is weak. Are you sure that you replaced all the paper and electrolytic capacitors? If any are leaky in that section of the circuitry it will effect the picture. In the worst case, this is caused by a problem with the picture tube. But if your picture is bright, I don't think that there's a problem with the picture tube. If it's too bright, maybe the ion trap magnet should be moved. If you don't have an ion trap magnet, this could be an aluminized tube, which uses a different method of trapping the ions. Does the picture get larger and go out of focus when the brightness is turned up? If so, that means the HV rectifier isn't working.

What are you looking at when the problem is occurring? Is this an over the air channel, cable TV, VHS Tape, DVD, or DTV converter?

Just some ideas. I hope that this helps.

Dave
:Hi everyone, I finally got back to the tv and it worked right away. Picture tube is very bright, the yoke turned out to be the only problem. The picture has a bit of distortion though. when a part of an image is white, relfecting or giving off light, everything right of the bright spot is black. Does anyone know what causes this? how to fix it? It is really noticable
:Thanks

1. The set uses a 10fp4 , aluminized picture tube. no ion trap
2. all paper caps and all electrolitics have been replaced.
3. 1b3 tests good
4. Output is from a vcr, though broadcast did it also.
5. I will try a New 1b3 later
6. main power transformer runs hot... But not overdrawing current

:Ian,
: I have worked on these sets. Maybe it's the positioning of your ion trap (if your picture tube requires one) or the centering of the picture. I think this can also happen if the HV rectifier is weak. Are you sure that you replaced all the paper and electrolytic capacitors? If any are leaky in that section of the circuitry it will effect the picture. In the worst case, this is caused by a problem with the picture tube. But if your picture is bright, I don't think that there's a problem with the picture tube. If it's too bright, maybe the ion trap magnet should be moved. If you don't have an ion trap magnet, this could be an aluminized tube, which uses a different method of trapping the ions. Does the picture get larger and go out of focus when the brightness is turned up? If so, that means the HV rectifier isn't working.
:
: What are you looking at when the problem is occurring? Is this an over the air channel, cable TV, VHS Tape, DVD, or DTV converter?
:
:Just some ideas. I hope that this helps.
:
:Dave
::Hi everyone, I finally got back to the tv and it worked right away. Picture tube is very bright, the yoke turned out to be the only problem. The picture has a bit of distortion though. when a part of an image is white, relfecting or giving off light, everything right of the bright spot is black. Does anyone know what causes this? how to fix it? It is really noticable
::Thanks

I swapped out the 1b3 and much of the distortion is gone, however about 1/2 the time the tv is turned on it blows the 2.5 amp fuse. Each time it was turned off it was unplugged. Could the positioning of the plug be causing this( because the 1 meg resistor?)
Also the contrast control affects image clarity and if moved in large amounts the horizontal hold. WHY?
Thanks

:I swapped out the 1b3 and much of the distortion is gone, however about 1/2 the time the tv is turned on it blows the 2.5 amp fuse. Each time it was turned off it was unplugged. Could the positioning of the plug be causing this( because the 1 meg resistor?)
:Also the contrast control affects image clarity and if moved in large amounts the horizontal hold. WHY?
:Thanks

Does it blow the fuse right away when turned on? Or does it warm up some then blow ? It is sounding like your horizontal drive may be a little low. Check for the - drive at the input grid of the horizontal output tube. If low, it will heat up things, and draw more current. When you turn up the contrast there may not be enough B+ then, and the horizontal osc. will drift off. Also check your B+ at the rectifier for enough B+ to run all that heavy load. Damper tube too could be weak.

there are 2 rectifiers a 5u4 and a 5y3 I think the contrast runs off the 5y3 while the Horizontal runs off the 5u4. The fuse blows right away on turn on. However once the tv is unplugged refused and turned back on it powers up. Would a 3 amp fuse be too much? i have it fused at 2.5 amps, and it is rated at 2 amps (220 watts)

::I swapped out the 1b3 and much of the distortion is gone, however about 1/2 the time the tv is turned on it blows the 2.5 amp fuse. Each time it was turned off it was unplugged. Could the positioning of the plug be causing this( because the 1 meg resistor?)
::Also the contrast control affects image clarity and if moved in large amounts the horizontal hold. WHY?
::Thanks
:
:Does it blow the fuse right away when turned on? Or does it warm up some then blow ? It is sounding like your horizontal drive may be a little low. Check for the - drive at the input grid of the horizontal output tube. If low, it will heat up things, and draw more current. When you turn up the contrast there may not be enough B+ then, and the horizontal osc. will drift off. Also check your B+ at the rectifier for enough B+ to run all that heavy load. Damper tube too could be weak.

You might need to use a slow blow fuse.

It powered up for the first time this week with no problem, Oh well I just fix the occasional fuse. The picture now has some distortion when running off of a vcr. The audio is causeing dark lines in the picture. How do I fix this?
Thanks
Ian