On a plasma, what board would be responsible for performing convergence?

Devices: All projection TV's (HD or analog), especially Samsung

If its a Samsung HCN653W (or similar model), the first thing to try is the menu option named "Magic Focus", which tunes the set's focus.

Otherwise, it sounds like a job for a convergence. Perform a convergence procedure on your TV, and if the problem recurs within a few days/weeks, then your TV's 'convergence amplifier' board (aka "convergence amp board") is starting to fail.
This board may fail completely, in which case, your convergence procedure will fail to improve the picture.
A "convergence procedure" can be performed entirely by just using the appropriate setup menu option and your remote control.
This board may partially fail, in which case your convergence procedure will properly converge the Red, Blue, Green colors on just part of the screen, whereas a properly functioning convergence amp board will allow complete convergence of the colors across the entire screen.
Your TV's convergence procedure instructions will be found in your TV's Owners Manual.
At least one Projection TV manufacturer recommends that the consumer perform a convergence procedure every 30 days, but most TV owners find that excessive, and might only do one when (a) there's an evident color convergence problem in any part of the picture, or (b) once every 3-6 months.

How-to video: www.youtube.com/watch?v=esk4nYZKFcg
how-to instructions: www.ehow.com/how_2034880_perform-convergence--tv.html

cost to you: $zero.

If the convergence amp board is bad, cost for a service call would be $300 (USD) plus $100 for a new board plus 50% markup on parts = about $450 (USD)
Cost to order a new board online: about $100 (USD) + shipping + sales tax.
Alternatively, if you can solder/desolder STK's (Power Amplifier Integrated Circuits), one can repair a convergence amp board for as little as $30 (USD) or so.

The tv HYPER board it is dead aslo known as a tv convergence board.Tv have a convergence problems,it is dead.Tv Magic Focus button no longer response give error messages.Tv have any colors lines R,G,B mis alignments,have colors shadows pictures or 3D picture look alike?Yes,than the tv HYPER board it is dead also known as a tv convergence board must have it components parts replaced like 2 STK convergence ICS and some or all of resistors too.To fixed the tv HYPER also known as a tv convergence board to solved the tv convergence pictures problems.The tvs shops will cost u like $300-350 for parts and labors.

Ur tv is a DLP projection tv?Yes,than this tv have a problems known as a convergence pictures problems,it is dead.Tv have colors lines R,G,B mis alignments,have colors shadows pictures or 3D pictures look alike?Yes,than the tv convergence board is it dead,to causes this problems.The tv convergence board must have it parts to be replaced like 2 STK convergence ICS and some or all of it resistors too.To fixed the tv convergence board to solved the tv convergence pictures problems.The tvs shops will cost u like $300-350 for parts and labors.

This problem happens to plasma TVs usually due to the Z SUS part, Z SUS board and Z Drive Board, malfunctioning. The Z SUS is responsible in resetting the screen for the next picture to appear. If it malfunctions, the image of the previous picture freezes and appears as shadow. Usually, the last image on the screen when you turned the unit off appears when you turn it back on before the actual picture appears.
The usual fix for this is alignment. That is, adjusting the voltages that powers the boards to an appropriate value that is indicated on the back of the panel. You may need the service of a qualified technician to perform the alignment.
I hope you find this information helpful.

You have a Convergence issue. The Convergence Ic and related circuits are bad and need to be replaced. After that is done you need to have a Complete Factory Convergence Alignment performed by a trained samsung tech.

you are in luck my friend!  i just performed a fix on a gateway plasma that has LG boards inside.  It is exactly what you are talking about.  Go to the attached link and follow the thread carefully and read it all before starting.  IT WILL WORK!
http://www.avforums.com/forums/plasma-televisions/462873-black-line-fault-hyundai-hpt4240-fixed.html

enjoy!
stephen

check and re-solder the connections on the 2 convergence ICs in the middle power board. they are going to be attaches to the biggest heat-sink in the tv. if the re-soldering doesn't fix then replace with STK392-570 i would replace both but if you look at the board you should be able to figure out which chip is responsible for the vertical and which is the horizontal convergence. each IC converges all 3 colors but one is responsible for one axis.

Convergence PCB probably not available....can you get me any #'s off the PCB or part # of STK IC or location # of convergence IC ??? ..................Should be worth fixing if I can get alittle more info....................T.

Note to mountain mom: You have a completely different
symptom ..............+ need service #.............
Try DVD ? all inputs ? cable box ? source to RF coax= on ch.3 ?..............................T.

PTS Electronics Do a google search.

This is a Plasma TV set, there is no convergence adjustments on this set. the convergence adjustments are for tube type projection TV sets. You could have a few problems with your TV. You could have a bad color whell assembly, a bad light engine assy. or a problem with the main board. This is not a set a that some who is not trained on plasma TV sets should attempt to troubleshoot and or repair. depending on how old this set is, it may still be under warranty. if it is not, call out only a Samsung authorized servicer, as they will have the boards and proper tools to service this TV. Good Luck