Question about Samsung PCN5425R 54" Rear Projection Television

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Triple Vision Overnight the projection television is out of focus weavy fuchia pick and green lines starting at the very top of the screen. Please help.

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One of your convergence output IC's has stopped working and needs to be replaced. This is a very common problem in projection TV's. The IC should be replaced and the convergence circuits realigned by someone with experience in repairing projection TV's.

Posted on Aug 05, 2007

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Image is out of focus and pulsating green lines around some image


yes it is repairable will not be cheap.a tech will have to do the convergence inside the tv,the remote only does so much.i have had 3 in the past and when they get older they become dull,i would not by rear projection any more years going back that was the only choose you had for a big screen ,now lcd and plasma have come down in price i would be looking at that if i was you.

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Focus and screen control box / remove front bottom panel there you will find it / it has 3 controls on top 3 on bottom top are focus for RGB tubes bottom controls adjust screen drives for RGB.

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1 Answer

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You have a focus and screen control box it has 3 controls on top 3on bottom these are the controls for Red-Green-Blue screen drives and for focus to each tube. IT should have Focus /Screen on it.

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2 Answers

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1 Answer

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Good Day;
Suspect Convergence IC's STK4274, part Number 2003191. Replace all three IK04(red), IK05(green), IK06(blue).
Good Luck, big IRISH.

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you have a convergence problem that will require the replacement of the convergence amp ics.

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i have found when samsangs convergence are out of range perfect focus will fail. if the are out of range a technician will try to adjust the set in service mode. store these values and then this will be the base for the perfect focus. If the set has a bad convergence cuircit then they have to be replaced.

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1 Answer

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Sounds like the green is out of focus. If the focus control for the green does not control it enough to make the width the same as the red, then, the lens on top of the green can be adjusted to focus that tube. On the lens, there is a wing nut on a screw to loosen it and move the lens left or right a bit to help with the focus. Hope this helps.

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