TV was fine one day, and the next day the picture is very fuzzy or blurry. Even the green words displayed when you call up the menu are fuzzy, with maybe a 3/4 inch spread from center (so a clear word is displayed like the ink had been smooshed 3/8ths from center in all directions). This occurs on cable, DVD, and antenna TV input, and on VID1 and VID2 inputs. I am actually an electronics technician with about 14 years experience, but not on TV's, and with a 3 year old child and a 7 month old child, I dont have the time or safe workspace to trouble shoot any length of time (plus no schematic). If someone could point me towards a handful of parts to check I would be very grateful! (need your MRI machine or CT Scanner fixed?, Maybe cell phone or radio?) Thanks in advance!
Before shuttle83 came along I had gotten the schematic and service manual, but those didn't give much for troubleshooting my specific problem. Considering I don't have a HV probe (last I knew of they were expensive), I just opened the TV up again today to see if I could get lucky with the focus adjust that I didn't see before. Sure enough, it is on the side of the flyback. Less than a quarter turn and no more fuzzy picture. Why did they bury this inside the case? To make you buy a new TV when it tweaks out of tolerance! Ugh. Anyways, now I can use my TV again! Thank you shuttle83! Before shuttle83 came along I had gotten the schematic and service manual, but those didn't give much for troubleshooting my specific problem. Considering I don't have a HV probe (last I knew of they were expensive), I just opened the TV up again today to see if I could get lucky with the focus adjust that I didn't see before. Sure enough, it is on the side of the flyback. Less than a quarter turn and no more fuzzy picture. Why did they bury this inside the case? To make you buy a new TV when it tweaks out of tolerance! Ugh. Anyways, now I can use my TV again! Thank you shuttle83!
Not sure if I should repost, but with the TV watchable again, I have found the focus was not the only issue. It appears (from searching online and finding pictures of TV screens looking like mine) that the "Grey scale is too blue" (the screen is blue-ish almost as if the bright was too high, which it isn't, and the R/G balance adjustment doesn't seem to change the tint of anything), and that there are "Retrace lines" (faint blue-ish lines about an inch apart, spanning entire screen top to bottom, parallel to each other, and at the top and bottom they reach all the way across, but in the middle they pull in a few inches from the edge). I hope this catches shuttle83's attention again!Not sure if I should repost, but with the TV watchable again, I have found the focus was not the only issue. It appears (from searching online and finding pictures of TV screens looking like mine) that the "Grey scale is too blue" (the screen is blue-ish almost as if the bright was too high, which it isn't, and the R/G balance adjustment doesn't seem to change the tint of anything), and that there are "Retrace lines" (faint blue-ish lines about an inch apart, spanning entire screen top to bottom, parallel to each other, and at the top and bottom they reach all the way across, but in the middle they pull in a few inches from the edge). I hope this catches shuttle83's attention again!
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Ok with you I can skip the "do you have electronics experience?" questions. With 14 years under your belt you are a pro. So here we go.
The problem you are experiencing is called blooming/loss of focus this occurs when there is an increase in CRT anode voltage and control of the electron guns (in the CRT) is lost. The result is the picture spreads and focus is affected. The problem can some times be taken care of by adjusting the focus control However if you have auto focus the auto focus circuitry might be the problem.
The common parts (areas) to check are as follows:
1) Focus control (to see if the problem can be soled by adjustment)
2) IHVT anode (test to see if voltage is correct you will need a schematic and a high voltage probe)
3) CRT Socket board ( Check to see if the bias voltages and input signals are correct you will need a schematic, multimeter and oscilloscope)
These would be the areas to check, I hope that you are seeing my point here. My next bit advise if not one of your experience, you have that, 14 years of it. However, you have little ones and they are your NUMBER ONE concern, So my advice would be to get the set repaired at a TV repair shop. The reason being is because even though I have named some places to start your troubleshooting, TV repair is not an easy thing and there may be other components that could have gone bad and you don't have the time to do investigative troubleshooting.
I wish you well on this issue and take care of those little ones.
Respectfully Submitted,
Shuttle83
It's never really that easy huh? well lets see if we can't get this issue cleared up now that you have seen the focus control and can get the picture clear, lets talk about what is happening now what you are getting are called retrace lines,. They occur when the blanking pulse does not shut off the electron guns as the beam goes back across the screen from right to left This is usually the result of poor high voltage regulation hence your original blooming issue. a high voltage probe would come in very handy now because you really need to know the anode voltage value, because you will have to adjust the focus1, the screen and the control (focus2) grids (the flyback transformer should have all three of these controls also check your schematic for these controls, these must be adjusted to obtain the values on the schematic. Once the values are the same as the schematic your probles will be over, this is more or less an adjustment problem.
It's never really that easy huh? well lets see if we can't get this issue cleared up now that you have seen the focus control and can get the picture clear, lets talk about what is happening now what you are getting are called retrace lines,. They occur when the blanking pulse does not shut off the electron guns as the beam goes back across the screen from right to left This is usually the result of poor high voltage regulation hence your original blooming issue. a high voltage probe would come in very handy now because you really need to know the anode voltage value, because you will have to adjust the focus1, the screen and the control (focus2) grids (the flyback transformer should have all three of these controls also check your schematic for these controls, these must be adjusted to obtain the values on the schematic. Once the values are the same as the schematic your probles will be over, this is more or less an adjustment problem.
I hope this helps.
Thank you,
Shuttle83
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Below are some troubleshooting tips for a TV that has a fuzzy or blurry picture;
If your Plasma or LCD TV picture is blurry or fuzzy there are several things that may be causing the problem. It's worth running through the following list before seeking service. You may find yourself saving the full cost of a TV repair.
Make sure you are using the appropriate cable box for your TV. If you have a high-definition TV you should also be using a high-def channel box from your cable provider. Watching standard definition channels on a high-def TV can make the picture look distorted and fuzzy.
Not all cable channels are broadcast in high-definition. When you stretch a standard definition picture to fill the full frame of your wide-screen TV it may look distorted. You can try changing your TV display settings to show standard-def channels at their native resolution. This will create black or gray bands on either side of your picture.
Ideally all of your video components will be connected to your TV with HDMI cables. Your next best option will be component video cables. If your cable box does not have HDMI capabilities, contact your cable company about upgrading your box to one that does include HDMI.
Make sure there is no glare on your TV from a window or other strong light source. This can significantly degrade the quality of the image you are watching.
If your TV has digital noise reduction, try turning that feature on.
You can adjust your TV's sharpness and picture modes to see if that improves picture quality.
Try plugging the power cord into a different electrical outlet and/or surge protector. You may be receiving electrical interference through your power cord.
Trying moving any nearby electrical devices away from the TV. They may be creating interference that can degrade the picture quality.
Let me know if the above helps or not, so that I can direct you further on what do next.....
unfortunately these newer tvs do not display the standard definition analog channels very well. the picture gets better when viewing digital channels but doesnt display at its best untill u place it on a high definition channel
This is not an easy fix. It's the main board (PCI) which is the board you plug your DVD player or cable line into. You could replace it yourself, but if your not a tech you might want to have a local repair shop do it. You could find the part online. This is an older TV so the part might cost you $300.
Fuzzy is a funny word. I never use it to describe a picture problem. That because fuzzy can go too many different ways. There is snowy fuzzy, blurry fuzzy, grainy fuzzy, and demodulated fuzzy. If the set goes out of focus intermittently that has something to do with the focus ciruitry. If it goes grainy that is a front end problem, usually tuner related. The other types of fuzzy are generally associated with problems in video processing some where. So, which is it?
Oh, and BTW that unit has three small picture tubes in it, one red, one blue, and one green. It doesn't have a 'bulb'.
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.
I think what has happened is the your TVs are out of focus which could be due to a voltage problem. First I would warn you that this is a problem in the High voltage section of your TV and caution should be taken, in fact I would suggest that if you do not have a background in electronics that you get the TV checked and fix by a qualified TV repair technician. However if you do have a background the next few lines will make sense and you might be able to effect these repairs yourself.
Items needed for troubleshooting:
Schematic Diagram
Multimeter
High Voltage probe (40Kv)
Universal Video Analyzer (UVA)
1) Unplug the TV and take the back off of it
2) connect the UVA to the tuner F connector and setup the UVA to send a test pattern into the TV
3) Power the TV back up and turn to the channel set on the UVA
4) check the anode voltage on the CRT with the HV probe (connected to the Multimeter set to volts and grounded) and compare it to the voltage on the schematic.
5) If the voltage is not right adjust the focus and screen controls on the Integrated High Voltage Transformer (IHVT) to obtain the proper voltage.
6) Check the pattern to see if it is still fuzzy.
If the pattern is still fuzzy you may have to inspect/replace the IHVT and or its associative circuitry.
If you suspect that the IHVT is bad you can perform a ring test on the transformer using the UVA. (The instructions on how to do this are on the UVA quick steps pull out. or the instructions can be looked up on the web.
I own the same model of tv and have owned it for over 1.5 years. I moved with it twice. I had this problem about a month ago. On both vertical sides the screen became very fuzzy, yet the center remained clear. When turning the tv off and on I also noticed very wierd red, green, and blue lines streaming across the screen before the picture comes up or after it fades. I found no solution or cause to the problem. But I had two "long-boy" speakers from my panisonic 5.1 surround sound system setup right next the tv on either side. I set the center channel on top of the tv with the receiver on the shelf below. I thought well maybe some how the speakers were cause some sort problem in the tv. I moved the side "long-boy" speakers from directly next to the tv to about 6" away and removed the center speaker from the top of the tv. After several days of normal use of this configuration, the tv turned like normal and the fuzzy edges were gone. The symptoms lasted for around two weeks, and the several days after I moved my speakers. My only guess is that without a deguassing feature, it took several days for the magnitism to return to normal after repositioning my speakers.
Before shuttle83 came along I had gotten the schematic and service manual, but those didn't give much for troubleshooting my specific problem. Considering I don't have a HV probe (last I knew of they were expensive), I just opened the TV up again today to see if I could get lucky with the focus adjust that I didn't see before. Sure enough, it is on the side of the flyback. Less than a quarter turn and no more fuzzy picture. Why did they bury this inside the case? To make you buy a new TV when it tweaks out of tolerance! Ugh. Anyways, now I can use my TV again! Thank you shuttle83!
Not sure if I should repost, but with the TV watchable again, I have found the focus was not the only issue. It appears (from searching online and finding pictures of TV screens looking like mine) that the "Grey scale is too blue" (the screen is blue-ish almost as if the bright was too high, which it isn't, and the R/G balance adjustment doesn't seem to change the tint of anything), and that there are "Retrace lines" (faint blue-ish lines about an inch apart, spanning entire screen top to bottom, parallel to each other, and at the top and bottom they reach all the way across, but in the middle they pull in a few inches from the edge). I hope this catches shuttle83's attention again!
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