Best method for adjusting the yoke (for geometry)

[billd420]

Hey guys, whats up?

I'm doing some work on a Sharp Image 33" monitor right now. I just swapped in a (near new) chassis last night. All of my color and brightness issues were resolved, however the geometry issues I was having before remained (hour glass shaped picture).

From what I've been reading, something got dislodged between the yoke and tube. From what I understand, you can reposition the yoke up, down, left or right, and wedge it in place once its correct.

Am I understanding this correctly? From what I gather, I need to loosen the two screws on the yoke by the convergence rings making it so I can adjust the yoke itself. Also, from what I understand, this needs to be done while the monitor is live.

Does anyone have any tips, or pointers for me? What is save to touch on the yoke, and what isn't (while its running)? I've never adjusted a yoke or convergence rings before, but have plenty of experience with other monitor related fixes.

Thanks for any help,
Bill

[Wade]

Hey guys, whats up?

I'm doing some work on a Sharp Image 33" monitor right now. I just swapped in a (near new) chassis last night. All of my color and brightness issues were resolved, however the geometry issues I was having before remained (hour glass shaped picture).

From what I've been reading, something got dislodged between the yoke and tube. From what I understand, you can reposition the yoke up, down, left or right, and wedge it in place once its correct.

Am I understanding this correctly? From what I gather, I need to loosen the two screws on the yoke by the convergence rings making it so I can adjust the yoke itself. Also, from what I understand, this needs to be done while the monitor is live.

Does anyone have any tips, or pointers for me? What is save to touch on the yoke, and what isn't (while its running)? I've never adjusted a yoke or convergence rings before, but have plenty of experience with other monitor related fixes.

Thanks for any help,
Bill

I have limited experience with this.  I had a monitor that had a twisted picture.  I didn't adjust it live, I made small adjustments incrementally.  Twisting spun the picture and pulling away from the tube made the picture larger IIRC.

Wade

[Rickn]

What you are describing is known as pincushioning, try adjusting the pincushion control if there is one?? It may be labeled PCC or E/W correction.
By the way there are 2 types of tubes when it comes to Pincushioning.
One type is pincushion free, in this case the tube and yoke correct themselves for Pincushion- in this case ther will not be a pincushion control. You can tell this by looking at the yoke, if there are 4 metal tabs that protude from the circumfrence of the white plastic housing - it is a pin free.

If not then there has to a pincushion circuit and control.

Hope this helps

Rick@niemandisplays.com

[kagaden]

Hey guys, whats up?

I'm doing some work on a Sharp Image 33" monitor right now. I just swapped in a (near new) chassis last night. All of my color and brightness issues were resolved, however the geometry issues I was having before remained (hour glass shaped picture).

From what I've been reading, something got dislodged between the yoke and tube. From what I understand, you can reposition the yoke up, down, left or right, and wedge it in place once its correct.

Am I understanding this correctly? From what I gather, I need to loosen the two screws on the yoke by the convergence rings making it so I can adjust the yoke itself. Also, from what I understand, this needs to be done while the monitor is live.

Does anyone have any tips, or pointers for me? What is save to touch on the yoke, and what isn't (while its running)? I've never adjusted a yoke or convergence rings before, but have plenty of experience with other monitor related fixes.

Thanks for any help,
Bill

Bill, I have the exact same problem with the exact same monitor. Did you manage to fix it?