Question about Samsung HCN4727W 47" Rear Projection Television

3 Answers

Convergance red tube out of alingment, not sure exactly whats going on but the red wont converge right and the perfect focus wont complete the progression. TV still operates and sounds great, but picture is a bit blurry on right side of screen, where the red wont converge.

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  • mulz yo Jul 28, 2008

    Thanks for the info, on average you know what that job would cost from a repair shop to do (time, looked up parts seems to be relatively cheap). Any more info appreciated, bought the TV for my sons apartment, but dont have the time between work and other time occupations to do the repair myself as its been a while sence ive needed to soldier anything (did a video card volt mod a while back, but other than that im sol with a soldiering gun (coming from a welder heh.))

  • noah961 Dec 22, 2008

    I have the same problem with my Samsung 47" Rear Projection LCD HDTV (HCN4727WX/XAA). I also tried to adjust the convergence with both red and blue. The red adjusted, but the blue didn't even move. The perfect focus only reached 4%. How was this problem resolved and how much did it cost????

    Thanks,

    Noah
    noah@definefit.com

  • nicole wright Feb 13, 2009

    I have the same problem and I purchased the parts but I am having issues getting the old ones out....any suggestions?

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You need to have both convergence ics replaced STK392-040 (2).resistors 3.9 ohms they will be open.

Posted on Jul 27, 2008

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Buy them on ebay cheap easy to do im not a technician and it was easy to do just be patient

Posted on Jan 26, 2009

I have the same problem, a blue and red hue like 3-D I tried adjusting the red and blue convergence but the blue would not move at all but the red would and the perfect focus only gets to four percent.

Posted on Sep 25, 2008

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Posted on Jan 02, 2017

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I have a Sony KDP-57WS550 TV that has a convergence problem. Based on the symptoms, I'm not sure whether to indict the convergence ICs. In the convergence mode, I can move the red (and blue) crosses,...


With your TV in setup Use a small magnet to "move" the non converged Red, Blue, or, Green color lines "crosses" (each CRT will need to be adjusted in turn) by moving the magnet close to the offending Red, Blue or,Green color CRT yoke or, tube while observing the movement of the CRT color line "cross" in a mirror ( try several places near the tube and, several strengths of magnets:) a refrigerator sheet magnet works well (you can cut these with a scissors to make a better fit or, apply less magnetic "pull." by making them smaller (you may need more than one magnet per tube to fix each CRT's convergence) When you have each CRT tube's convergence right, apply some clear silicone adhesive to the magnet and, permanently affix the magnet to the now "fixed" CRT tube exactly where you placed the magnet to obtain the best convergence on the CRT.
(Do not adjust the "Green" CRT unless you must, as it is used as the color line to adjust other lines to)

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You have a bad sensor, a bad digital convergence board, or the new board is not working correctly. I would start by swaping out the convergence board or exchange it for another one. Good Luck

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hello What you have is a convergence problem. There is 2 modules inside your set that aligns the colors to have the same geometry and superposed . It is a common problem in rear projection tvs ,
You don`t have to worry about your blue tube , i`m sure it is perfectly fine, it just needs to be aligned through the convergence circuit.
Most often the problem is with those convergence modules that are faulty and need to be replaced.
Hope this will help good luck

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Odds are real good that the cooling fluid in the green and blue picture tube assemblies has become contaminated. You can tell by looking down into the lenses with a flash light. Funny thing is the red never gets contaminated because whatever organism is causing the problem can't survive in red light. BTW this may still not solve all of your convergence problems but when the colors are so badly diffused the convergence sensors for flash focus can't lock onto the beam landing.

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The problem you have is the 2 STK - 392 convergence integrated circuits need replacing the cost in the UK is about £150.
SUPER8

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1 Answer

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The tv has 2 focus adjustments for each tube, mechanical and electrical.

1. Mechanical focus is set by looking at screen from back (through inspection plate on back of most samsungs) and rotating the lens assembly on CRT. loosen wing nut and turn lens assembly to go through focus and back to best position.

Put convergence pattern on screen and manually misadjust bottom red and green lines convergence so they can be seen through inspection hole.

With back cover of TV off you can usually reach your hand up beside the lens assembly to loosen the wing nut then rotate to adjust. Green is in the middle. The focus will be obvious when you rotate and look

When you are finished make sure the foam dust protector is not over any of the lens assemblies and the wing nut is tight.

2. Electrical focus - located at front of unit. the front grille/speaker cover is removed and maybe a cover over the front crt inspection hole.

In the inspection hole there is a black plastic "Focus/screen adjust Assembly" with 2 rows of 3 controls.

One row is focus and the other is screen. The middle controls are for green with R/B on either side. Usually the controls are labelled as "focus" and "screen". You want to adjust the focus controls, one for each color. Look for the focus or screen label imprinted in the plastic. Don't play with the screen settings.

With the same misadjusted convergence pattern you can see a red, blue and green line. Adjust green focus and watch green line for best focus. Do same for other 2.

Screen adjustments are very exact and delicate. The easiest way to deal with them is to turn color off in Customer adjust menu. Put any color tone adjustments in the middle (low, med, high, put at med).

You should have a b/w picture if there are no crt or other color related faults. If it is close to B/W leave screens alone.

If the pix is too green, then the green screen setting must be reduced a small amount. Do not play with these adjustments as most TV repairrers have a difficult time adjusting them.

If focus adjustments don't help then focus control or CRT may be defective. Needs expert to determine.

easyab

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


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Sounds like the digital convergence controls is possibly the item giving you the problem, if you have already changed the convergence board. You can get a used digital convergence board at the following link, just leave them a email and state your model number and what your needing.
http://servicemanuals.vstore.ca/

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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

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perfect focus functions are based on service mode setup...or factory settings. if the alignment of these setting are loss then the unit wont perfect focus. does the unit have a complete loss of convergence. a complete loss of convergence indicate possible failure of convergence amps.

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