Question about Samsung HCM4216W 42" Rear Projection Television
Hello, I have searched the internet for days and I have yet to find a solution to my tv problem. I seem to have a blurry image from the red lamp, but the green and blue are sharp. There was a convergence problem earlier, but I completely replaced the convergence board. The Blue and green are aligned, but the red is still blurry. Its not that the red cannot converge, but rather it seems as if the red lamp is out of focus or lacking sharpness. (similar to the blurriness when not wearing glasses.)
I ran perfect focus in the customer menu, but it hangs at 20% because the red crt is not bright enough/light output is too weak and washed out.
So I'm convinced its not a convergence problem, but i cant seem to diagnose the problem.
Can someone please lend me a hand or some sort of direction.
p.s. - the tv was moved around in January (remodeling basement). It had a convergence problem then so I didnt power it on. Once the remodeling was completed (June), I replaced the convergence board, but found the blurry red images. Is it possible that the moving caused the red crt to misalign?
Any help is greatly appreciated, Thanks!
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.
Posted on Jun 25, 2008
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Posted on Jan 02, 2017
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