Question about Sharp 32C241 TV

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Fuzzy or blurry picture

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!

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  • Michael Salter Oct 11, 2007

    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!

  • Michael Salter Oct 11, 2007

    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

Posted on Sep 22, 2007

  • Henry McKelvey
    Henry McKelvey Oct 11, 2007

    Hello DocSalt,


    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,





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