Question about Samsung HCN4226W 42" Rear Projection HDTV-Ready Television

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Convergance Amp Problem

My samsung HCN4226wx1xaa will not power up with the CG Amp +/_20v plugged in. Unplugging it allows the set to power up with the raster and sound. My schematic of the Sub1 and sub2 bd is not real clear and can't find the signal source that is keeping the power supply from coming up with the board plugged in. None of the fuses are blown from this problem.

Thanks for the help

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  • theoB Aug 23, 2008

    Thanks for the reply. The new board is on the way, I though maybe you knew what is keeping the set from powering up with the board plugged in. Obviously the sub board is not looking for a signal that the cg bd is working because it will power up when it is unplugged. Figured the cg bd must be loading the +/_20v supply. Not that important, just curious.



  • alex_copley Aug 25, 2008

    from what i was just reading ..i had the same problem...bought new stk's replaced them now it still wont work so this could be the pcb now has shorted out???


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  • Samsung Master
  • 8,617 Answers

You need a new converence amp pcb. If you need to know where to get a replacement PCB let me know and I will post a link.

Posted on Aug 23, 2008

  • Sonny Berry
    Sonny Berry Aug 23, 2008

    The convergence board will short causing the set to shutdown for protective reasons,


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The convergence board has a +20V & -20V input. The +20V is OK, but the -20V measures about 4.5V when the cable is disconnected from the convergence board. I could not find any blown fuses but R858...

Replace R858 and R859...They also go bad frequently when the STK chips fail.

For everyone else...

All projection TV sets have two very common problems. One is convergence ( 3D/Warped video or dead set) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.

Common Problem #1) Convergence has gone out

Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. In some cases the TV will also not show any video. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.



Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

TV set after fluid change



You can get the correct parts, step by step photo instruction guides, and support from or click here

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Has a bow in it with colors seperate

your comverganc amp have failed they are stk392-110 there are 2 have a tech replace them

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Coloring is off and there is a ghosting effect


Part # BP95-00142E is the correct convergence amp board for a model # HCN4226W. Part # BP94-00155A is listed as a "CG Amp assembly board" also, but is not correct for a model # HCN4226W. They are both basically convergence amp boards. Here's a link to order the original Samsung covergence amp board for this model (HCN4226W) from a major parts distributor:

Samsung HCN4226W Replacement Part Convergence Amp Board

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No picture on samsung hlp5063wx/xaa

to test this set
unpug the 4 pin conector labeld + and _ 20v on the cg convergence module
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Mine is doing the same thing. I just talked to the repair guy. It is a power supply problem. Try unplugging it for 5 minutes and turning it back on. Also if you were having problem with any picture issues it is the convergance, and that requires chip replacement. They are estimating $350.00 to replace the power supply.

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Red blinking light

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It requires some pretty good solder skills and there may be a couple of resistors that need to go also. Take that CG board out it probably doesn't need it and you will likely have to completly re-align the set after repairing it with the new CG in there, just the IC's and resistors usually require minimal alinment

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