Question about Samsung HCM4216W 42" Rear Projection Television

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Replaced bulb and converge problems

I just recieved a broken samsung tv with a broken green bulb. I bought a new bulb online installed it and now that problem i am having is that the automatic convergence wont go past 25%. First i checked the new green bulb and as i looked in it i saw bubbles. Is this normal? Secondly i just tried to manually converge and i got pretty dag gum close but still not a professional job as this is the fist time i have ever taken apart a tv. Also whenever i try to do automatic converge it starts with green boxes goes to red boxes, hits 25% then restarts and never shows any blue. Any info would be helpfull on this problem i am having as i am completely new to the tv repair thingy.

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  • Joshua Minoda Apr 21, 2007

    ok thanks for the info. also is it normal for the green to not be able to become all the way in focus? i tried moving the wing nut and it wont focus all the way

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After replacing a Picture tube convergence/geometry allignments can be quite extensive and if they're not fairly precise the sensors for the auto conv. can not be calibrated therefore your auto conv. not working as you described. The key is usually the geometry start with the green lines and get them as square as you can then align the red/blue. Since the auto is not going to blue that often means the blue is to far out and the sensors are not picking it up.

Posted on Apr 21, 2007

  • josh vannoy Apr 23, 2007

    the wing nut loosens the lens and allows it to turn the wing nut by itself does nothing, also there is an electrical focus inside the TV. I would also be a little curious about the tube you got online often there are many types that may work but not quite perfectly.

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

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Common Problem #2) CRT Fluid is Cloudy

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Picture of a set that needs the fluid changed.

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TV set after fluid change

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69189a5.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Convergence problem


Sure I have this set,and have replaced my convergence board. I think there is an automatic convergence with this set because I didn't have to do any manual convergence after I installed the replacement board. Maybe I got lucky....

Take the cover off the rear of the set. (Unplug it first- duh)
Look to the top right, a board is screwed onto a metal support running horizontally across the set. I think there a 4 plugs but mark the ones red, green and blue as they have the same connectors and can be re-connected incorrectly. Unscrew the board from the frame, pop off the connections and put on the new board. My new board came with new connection cables so I replaced those also. I turned my TV on, did a Perfect focus and it looked good as new. I was really proud of myself that day.

But after you get it fixed, turn around and sell the set. I have had alot of work done on mine in the several years I have owned it.

Oh and make your brother pay for the new convergence board. The one I got was BP94-00155A.

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