Convergence problem, lower left corner fixed green gun convergence bows upward
My Pro 119 has just developed a convergence problem with the center fixed convergence green gun. The problem is in the Lower Left corner of the screen. In the convergence mode, the cross hair in that corner is pulled approxemately 2 inches toward the center (all other 8 cross hairs for the green gun are in there proper place) The convergence mode with the remote works in all 9 spots (Center and sides) with the red and blue guns. If I place a piece of paper over the center green gun, cutting off the light, the picture is then OK and the green curls upward in the lower left corner is gone (picture is then off in color, due to the green missing) The rest of the picture is OK with the green convergence, only out in the lower left corner and radiats toward the center of the picture. This is the first trouble I have had on this great Projection TV. It has been powered since I purchased it through a $400 PanaMax/Max 1500 Surge suppressor/line conditioner. Would appreciate any help on this and where would I be able to get parts. I am a retired electrical engineer and have been into the chassis of many TV's in the past and repaired. Built a Heath kit 2001 with all extras in 1980.
An expert who has achieved level 3 by getting 1000 points
An expert that got 20 achievements.
An expert that got 10 achievements.
An expert that got 5 achievements.
Re: Convergence problem, lower left corner fixed green...
You have a componet out of tolerance in the green drive circuits, resistor or capacitor. If you have the service manual you should be able to take some raedings off the test points for the circuit and be able to track it down. I am enclosing a link where you can purchase the service manual for that set for 10.99. They will mail it to you unless you go back to the site and request that they email it to you by clicking on the contact us link. They also offer unlimited free support if you purchase your manual. I am one of their support techs. Hope this helps. Heres the link http://servicemanuals.vstore.ca/
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
The repair isn't too complicated if you're comfortable working with a soldering iron. Sounds like one of the "guns" is shot. The chips that need replacing are attached to the heatsink on the convergence board. The reason for replacing both chips is if you're going to bother to take the board out and replace one bad chip, that is the best time to replace the other older chip. The link below is to step by step instructions including pictures of the repair. You can check it out to see if you want to try it. If not, the repair is expensive (between 250-400) depending on the repairman. Best of luck with your convergence problem.
It could be a cob web inside the tv or something laying on one of the guns, like a dead bug. If it's a cob web, you should be able to move the tv a little side to side and see it change from the moving air current. I would remove the back and vacuum off the lenses of the guns and look for cob webs. It's safe to touch and clean the lenses, just don't touch any electronics.If this doesn't fix it, it's probably fluid starting to cloud up in the guns or IC chip problems.
This is the one thing that even make TV repair persons shudder. You don't really have a convergence problem in the normal sense. The convergence works. What you have is a misaligned convergence situation which any documentation and or book on TV repair will tell you that at this point manual convergence adjustment is needed and the only thing you will have to do is keep trying to adjust the convergence until you get the center aligned, and then work towards the outer edges using both static (Center) and dynamic (outer edges) convergence techniques.
I have used this book when I use to teach TV repair. I hope you discover what I am tried to convey in my e-mail, this is no longer a question of can you fix a TV? It has become a question of do you have the patience to adjust a TV.
Good fortune in doing this, you will succeed if you just take your time and do static convergence first and then do the dynamic convergence with the manual controls. The procedure will be in the service manual.
HEY DF-YOU SET HAS 2 BAD STK392-110 CONVERGENCE ICS.THEY WILL NEED TO BE REPLACED AND IF NO OTHER CONVERGENCE CIRCUIT PARTS HAVE FAILED YOU SHOULD BE ABLE TO SET YOUR CONVERGENCE ALIGNMENT PROPERELY.TV REPAIR ESTIMATE SHOULD BE ABOUT 300.00$.DO IT YOURSELF FOR ABOUT 40.00$.
High Voltage Capacitor? Leave the set unplugged for 1/2 hour most components will selfdischarge, as for your problem, being a Magnavox, you have one of two problems, the convergence I suspect is what is blown out, this unit probably uses STK392-110 Ic's, I would suggest replacing with STK394-160e chips as they are probably shorted, some of the big resistors (1 or 2) may be opened up also, usually they change color. The only other thing that would cause usually a yellow color in the corners is the CRT Fluid, it changes from clear to Orange in color and clamps off the blue color from the fringes, I suspect the chips need replacement, dont forget to put some heatsink dope behind them, they are usually on the left in the front of the set (from the back) Big long heatsink that is fairly tall (probably the biggest heatsink in the set.) Good luck, and the repair usually runs around $350.