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MY SHARP 20 INCH COLOR TV GIVING NOISE IN SOUND?

TV CREATING NOISE SOME TIMES. IF I CHANGE CHANNEL DISTERBANCE WILL COME . THEN IF I FINE TUNED MANUALLY OK OR I HAVE TO TOUCH TUNER PLUG . SOME TIME PICTURE AND SOUND WILL BE SMOOTH.NO DRY SOLDER IN TUNER CARD.
WHAT IS THE PROBLEM. BUT IN AV MODE 100% OK.

IS IT TUNER PROBLEM?
IF SO, WHICH TUNER CARD I SHOULD PUT?
ANY ADJUSTMENT IN VOLTAGE ?

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Posted on Jan 16, 2009

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Tv out of foucs


These procedures are from the owners manual, go into menu and then picture quality and then: Convergence The Convergence feature lets you adjust the TV’s three tubes. When the TV tubes’ images are precisely aligned, they create the color images you see on the screen. Over time, the picture can drift out of alignment (this is normal). If your picture seems fuzzy or has a yellow tint, using Convergence could correct this misalignment. Only one convergence is needed for all inputs, regardless of the signal format. Note: Make sure the TV has been on for at least 30 minutes (TV needs to warm up for best results) before starting Auto Converge or Red/Blue Centering. When you select the Convergence feature, a submenu appears with three options: Auto Converge Automatically aligns the projection lenses to self-correct color images. You’ll see flashing squares of color dance across the screen (this is normal). Note: After performing auto convergence, use the Blue Centering and Red Centering menus to fine tune convergence in the center of the screen, if necessary. Blue Centering Aligns the blue and green images to fine-tune the picture. Red Centering Aligns the red and green images to fine-tune the picture. Note: The ability to change channels is disabled when adjusting the convergence options. The TV must be tuned to a usable signal to converge the picture.

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1 Answer

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Please fine tune those B/W channels to obtain color picture. If TV is more then 4 - 5 years old, it needs resoldering in tuning area or might need replacement of IF block.

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1 Answer

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hi,

sounds like a heat dissipation problem, or was, I take my covers off and airdust my sets every 6mths when I do my computers Sharp televisions are extremely good sets, my mom and dads sharp 10 inch color tv with vacuum tubes worked for 40 years without a hitch. I would take yours in to see how much its going to be. be careful if you take the cover off , theres high voltage present even unplugged via the heavy single red or yellow wire going to the tube.

sorry

J

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1 Answer

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i would say that it is the tuning try fine tuning it and see what that does

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1 Answer

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We have perfect picture but no sound when changing channel you get a sharp noise and thats it 1 reset once 2 ptoblem in transmission 3 as noise is there so your audio section is alright. the problem is sound signal in not reaching to audio section or print break in that line or some one has mistunned sound if section coil. hope this will help.

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1 Answer

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Your problem is somewhere between the tuner and video detector circuit. The signal entering your TV carries: video,red color,and blue color as well as sychronizing pulses for color and horizontal and vertical deflection ( actually vertical sync. is derived from horizontal sync.) along with burst pulses to synchronize the color. After all these, the sound is an fm signal entwined with a pilot signal for stereo audio. WHAT a mess! After the audio passes through all this, it is detected and sent to the audio processor. If any frequency has drifted away from it's value then you loose the sound. SO... your problem could be in any of the tuned circuits or in the audio processor IC (chip). Any component changing value could creat this problem. Most likely the audio processor IC. You'd need to have the set checked out by a tech to find your problem. Stargazer

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1 Answer

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You got the right idea,use the ext.imput on you tv and use the vcr to change the channels,you can check the solder conections in the tuner ,ussually the ground gets loose after a while but if you are not too familiar with tv service and dont want put any money in this set use your vcr.If the quality of the picture is still good then is worth keeping it.Let Us know if you need more information.

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3 Answers

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My panasonic Tv pic suddenly turned into a blue color I can't see the pic any more just can hear the audio.....any solutions????

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