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Samsung projection tv HCN4226W. Blue does not focus when using perfect focus. The picture improves if the tv is on for a long time, but the center does not focus properly.

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This is a good indication that there are poor solder connections at the convergence ICs. If you can solder, you can fix this yourself. The convergence ICs are large black ICs attached to a heat sink and will be marked STKxxx. Resolder the pins for these and the problem should be resolved.

Dan

Posted on Jul 10, 2008

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I recently bought a samsung hcn4226w at a yard sale for $50. Thought it was a good deal, but when i got home I saw the picture had a double image and the picture doesn't seem bright. After some tinkering...


This tv have convergence problems.Ur tv convergence board the 2 STK convergence ICS are defective,and some or all it resistor are dead.Try website like Tvrepairworld.com to buy a whole refurbish convergence board for the replacement.Spend about $100 dollars more this tv can be save.

May 14, 2010 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Convergence


This is an indication that the STK is bad. The PC board should be marked to indicate which one if for the green.

Dan

Apr 13, 2009 | Samsung HCM422W 42" Rear Projection...

1 Answer

One color Bow-tie Effect.


SAMSUNG Convergence Problem


It looks like blue convergence. Look at menu, select convergence and see if blue top is bent down on convergence adjust screen. Probably won’t adjust.

Some Samsungs have convergence IC’s on a separate convergence board in the back of the TV. Others have the IC’s mounted on the main deflection board. Either way the board has to be removed to get at the dud IC’s and associated burnt resistors.

You remove the appropriate board, determine if any resistors are burnt or damaged, replace any burnt or out of tolerance resistors, replace 1 or 2 IC's and re-install the board.

Now you have to adjust it to look like new.

If the unit has not been misadjusted and everything is OK now, running the auto focus may put the picture back to it’s previous stunning quality as it was before IC failed.

If after Perfect Focus it is still misadjusted noticeably, try the customer convergence adjustments. Operators’ manuals are available on web through searching.

If convergence can not be adjusted properly, you messed up chip install or resistors may be wrong value or open; or it needs major adjustment.

If you live around Calgary, Alberta try me instead:

http://calgaryconvergencerepair.weebly.com/convergence-explanation.html


Or try to the find the repairperson part of this website (on the Homepage) and search postal code. Maybe you will be lucky and someone from your area is listed for Projection TV repair.

Most rookies doing this job will cause damage and not be successful. They will pay double for someone to fix their mess or end up scrapping the TV. It is not a simple task. It is more difficult than batteries on a remote.

Good Luck

easyab

Jun 05, 2008 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Samsung HCN4226W blue color outlines


Samsung parts for convergance problem
http://www.partstore.com/Part/Samsung/Samsung/BP9500142E/New.aspx
This convergence board works with the following Samsung television models: HCM4215W, HCN529WX, HCN559WX/XAA, PCN5425R, HCN4226WX, HCN529WX/XA

Mar 10, 2008 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Blue color problem


same here, fuzzy blue when trying perfect focus, all other colors are sharp. I have the 2 STK392-040 package

Feb 24, 2008 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Samsung HCN4226W yello stain around the screen


Its a problem with the screen, Plasma depends upon a chemical and eletrical impluses to create a display... I think you might just want to change the screen.

Jan 10, 2008 | Samsung HCN4226W 42" Rear Projection...

1 Answer

My blue color is off...HCN4226W.


If the blue is shifted away from the rest of the picture and maybe bowed then try the manual convergence adjustment. My guess is the red will move but the blue won't. If I'm correct call a tech unless you are a skilled solderer, then replace the large STK amps in the Convergence circuit and check all of the resistors in the circuit. Good Luck.

Dec 28, 2007 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Fuzzy screen on a 41 in. Samsung DLP hdtv


use the "Perfect Focus" feature on my TV and let me know what happens

Dec 15, 2007 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Out of Focus


· Samsung parts for convergance problem
· http://www.partstore.com/Part/Samsung/Samsung/BP9500142E/New.aspx

Nov 24, 2007 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Perfect Focus Not Working- Picture is Blurred


· Samsung parts for convergance problem
· http://www.partstore.com/Part/Samsung/Samsung/BP9500142E/New.aspx

Nov 11, 2007 | Samsung HCN4226W 42" Rear Projection...

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