My 4 year old PT5598 has suddenly lost image sharpness. Automatic convergence adjustment using 'Perfect Focus' has no effect. White areas on the screen appear slightly 'muddled' with small 'particle like' grey spots. This is present in all colours, but is more noticeable with whites. Any ideas?
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Re: HD image has lost sharpness
This is not a convergence problem. Either the guns are out of focus (not likely) or the fluid in the CRTs has become contaminated. You should be able to get a detailed repair estimate for under $100. I would recommend that course of action as trying to diagnose this without seeing the screen will be difficult. From your description, I am leaning toward contamination.
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Re: HD image has lost sharpness
You will need to replace the convergance IC's if the colors are no longer lined up and they won't line up using the tv's controls. Also, if the crt lenses have a lot of dust on them removing that will help the sharpness and brightness of the picture. Don't use canned air. Get a crt lens cloth.
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CRT projection televisions need periodic maintenance to maintain a clear picture. Typically, to maintain a sharp picture, they require cleaning and alignment every two or three years. If the television is being used in an environment where there is cigarette smoke or other smoke sources, the optics inside the television can become dirty and cause the picture to blur. Additionally, CRT focus and alignment wander over time, or physical CRT alignment can be knocked out if the set is bumped or dropped. All RCA CRT projection televisions have an "alignment" or "convergence" adjustment in their adjustment menus, which are fairly simple to use. The convergence feature is usually accessible from the main menu of the television. Check your User's Manual for the procedure to touch-up the convergence adjustment and see if you are able to achieve a sharper picture. If the optics in your set have not been cleaned for several years, or if it is in a smoky environment, the picture will be blurry and usually a brownish color, In any case, since the set is several years old at this point, it's likely due for a cleaning. This is best done by a technician, and mostly involves physical cleaning of internal lenses, the refractor mirror on the back of the chassis, and the back of the opaque display screen. An adjustment of CRT bias controls and individual CRT focus adjustments will bring further improvement in the image sharpness and clarity.
No,need to diagnose.It a 100% convergence problems.Convergence problems very easy diagnose.The picture look like 3D,colors lines don't lines up.Fuzzy,out of focus.Convergence controls don't work to lines up any colors cross.The tech is cheating u if he said cost $125 to diagnose.If u know how to solders u could fix this convergence problems about $100.U can buy a convergence kit at Websites Tv repair World.com,Tvrepairkits.com.The shop everythings fix parts and labors only $300.
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.
perfect focus functions are based on service mode setup...or factory settings. if the alignment of these setting are loss then the unit wont perfect focus. does the unit have a complete loss of convergence. a complete loss of convergence indicate possible failure of convergence amps.
Look for bad pico fuse feeding B+ to convergence amps,two are
hiding under the heatsink amps are on, more fuses in power supply ...............................What part # did you use and what price / mfr. ?.............................T
please verify your model number on back of your tv..........T.
Go to front of TV remove front bottom there you will find the focus and screen Block it has 3 on top and 3 on bottom This is to adjust screen drives and focus for each Tube R/G/B. also in front of ICs check your pico fuses they will look like resistors will be Green or yellow make sure they are good if opened they can cause your problem as well.
The blue picture tube of a projection tv is usually the weakest in ability to focus and in
most cases loses its focus ablility before the red and green. Connect a cross-hatch generator to the rf inputs of the unit and check to see which areas
are most out of convergence. The corners are usually the worst. HD will always bring out the slightest imperfections. If the unit was totally out of convergence, I would have suggested replacing the convergence IC'S.In my experience with rear projection, your problem is normal wear . You could conceivably improve the picture by adjusting the blue focus on the screen focus block. Scrivitron
Well, fortunately the television that you purchased has an auto-convergence feature. What is happenning is that your color lamps are misaligned, did it get moved at all recently?
Anyway, in your menu you should see a "Convergence" menu, and inside that menu, a section called "Perfect Focus". Run Perfect Focus in this sequence: Green --> Red --> Blue
After that your picture should look great, if not try tinkering with the manual adjustments on the "Convergence" menu. Here are some URLs that you might find helpful: (just copy+paste into your browser)
Your Television On Samsung's Webstire:
Your Television's User Manual (Download And Open With Adobe PDF Reader) (The "Convergence" Menu Is Section 3.3)