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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