I am getting ready to replace my convergance circut. once I do, is it hard to realign the crt's? because I thought that I could undo the wing nut and move them a little to fix problem. So no I am sure that they are out of wack just a little.
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The rings are what center the projected image. Locate the exact center of your screen then cover the other two lenses and then you can adjust the rings to get as close to center as possible, then you should be able to complete the convergence alignment when the other two CRTs are uncovered.
Check the CRT fluid in the blue and green CRTs. It should be clear. These sets have problems with the fluid getting cloudy and hence letting less light through. It also gives it a dull picture look. If the fluid is cloudy, you will have to remove the CRT and replace the fluid. Then re-align the CRT via the convergence in the service menu.
replace both stk392-110 convergence ics.the crts could be weak if you have no brightness.if the picture is dim the crts are bad.but the movement of the convergence are bad stk392-110 ics.some models they are very difficult to
change.you may contact me at 972-579-0527 if you are in the dallas/ft.worth metroplex.
You may not need a template as long as the geometry has not been totally lost or corrupted. How is the image in red and blue? If any of the three convergence/CRTs has good geometry, you can align the others to it. You can simply cover over any CRT whose image you wish to block out while you are aligning the others.
the two resistors were likely burnt out with a convergence IC (chip). these are usually a stk392-120 on a philips, or simmilar. the alignments can be very tedious and difficult. what needs to be done is replace the ICs that control the colors that are mis-aligned. you might see that the green is square and straight, but the red or blue is off. in most cases, i would just change both convergence ICs plus the bad resistors. then go to your full re-alignment of convergence to fix the picture. hopefully the previous owner didn't mess anything up too much (if they changed anything on the CRTs ie yokes, lens focus, centering magnets it could counteract your electronic adjusments). before you put too much time into it, look to see that all 3 colors are atleast focused and it appears that the CRTs have been left untouched. once you get circuit repaired, you will probably want a service manual to help with alignment. this complexity may bring you to want to just pay for this repair, could run you anywhere from $200-400 depending on severity and local rates.
you dont need new CRTs (tubes) you need either the convergence Board or the convergence power supply board depending on the symptoms. If its only one color that is out of alignment its most likely the convergence board. If all the colors are out of alignment you need the convergence power supply board. you can get whichever one you need at the following link as they have both of those circuit boards and have free shipping. Heres the link, http://servicemanuals.vstore.ca/
What you're describing is probably contaminated coolant in the crts. Between the outer part of the crt and the lens is a chamber filled with a coolant (ethyl-glycol) which can become contaminated and cause blurred picture. I'd strongly recommend taking this to a shop the procedure for changing these is a bit beyond the layman level.
Remove Crt assembly. Mark the Crt lens position for accurate reasssembly. Mark the centering ring's postions to make easier realignment and carefully remove lens assembly by removing the four torx screws. Keep Crt assembly vertical so you won't leak the fluid...
Remove the inner lens by carefully prying up on the edge of it.
Dump out the fluid in the sink and wash the face of the Crt and chamber with water to remove all the fungus and crud. Flush the chamber with isopropyl alcohol to kill all the fungus and dry thoroughly.
Reassemble inner lens and outer lens and tighten all four torx screws.
Remove side filler plug and fill chamber with approved new Crt coolant, reinstall and converge.
Repeat this procedure for the other two Crts. It will need this done whether it looks clear or not !! The green and blue Crts in this unit are prone to this failure.
Hope this helps
You should NOT need to re-align the crts to correct this problem... Chances are the failure is in your convergence circuit and most likely the convergence amps, (IZ103 & IZ104)Samsung p/n#AA62-30173D which may be substituted to an original STK394-250 and you'll need two of those. (Make sure they're not cheap knock-offs)..
You may also want to test the resistors feeding those amps for change in value. And if I've lost you with any of this take the set to a qualified tech for the reapir - - you'll be money ahead... Under no circumstances should you need to change or alter the CRT placement. Chances are better for you winning the lotto three times in a row than it being a placement problem...