Question about JVC AV-21meu 21" TV

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Color problem menu-manual fine tuning is functioning ok where the picture has a color but a black and white picture appear after tuned to certain channel

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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.

Posted on Aug 01, 2008

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Posted on Jan 02, 2017

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Hi, I have bought an used Mistubishi CS-35405 TV a month back. The picture came in color for 1 week and after that the picture is coming in black and white. However the controls text like volume, menu and...


Hello Mr Kumar
According to you, there was colour displaying on your TV, and it has gone for now. It is now displaying picture in pure black/white also. Since black/white, picture is Ok, there is no problem to your picture tube. It now doesn't get chroma signals. That is the problem.
There are many reasons for this fault. The first one is related to Its RF stage, that is Video IF and Tuner stage. Since picture is correct in bl/wh, tuner has no problem. Your TV has PIP functions also. You just do this one first. Tune to a station with manual tuning, and advance the tuning process till the station goes out, and try to see, at any point during this process, you gets colour or not. If you get colour in this way, your TVs tuner has some problem. Before doing this keep the antenna corectly. If antenna is not in correct position this type of fault will occur. If these two won't help, the problem may be to its Chroma IC. If so this Ic should be replaced. You just do these things first and inform me about the progress through Fixya. I've its schematic diagram and can give you the number of Ics used in different stages. But I can do it only through Fixya. I can't send it to you diretly, since it is against our terms and conditions. Since the TV is a used one we don't know its present condition also.OK.

Oct 29, 2010 | Mitsubishi CS-35405 TV

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How can i autotune my soney trinitron tv iv lost the manual


Hello
Enter menu, and select the [autotune or auto search] function with the help of Prog+ Prog- and Vol+ and Vol- buttons. After that function highlighted press Vol+ button once and release. The TV will tune and store automatically in its memory, all the transmitting stations at that time, and after tuned the entire band it will finish tuning and will display the first channel. You must select auto tune for this. Not manual tune or fine tune functions. A horizontal bar will run across the bottom side of the screen indicating that the tuning process is in progress, and it will reset three times to zero and will continue tuning. It is due to the auto band selection is done inside the microcomputer of the tv. No other functions will response anymore, till autotune process is completed. Ok.

Oct 19, 2010 | Sony Televison & Video

1 Answer

Rca big sreen went black and white menue is still in color


Try using one of the other video input options, like AV inputs. If still have black and white picture, then the color processor is having issues. If now in color, then your tuner has issues detecting the chroma / luminance signal.

If you are using an external digital box, this may be the source of the problem as well. If you still have a VCR, connect the coax from VCR to the coax input on the TV, and play a tape. Tune the tv to channel 3 or 4. If in color, then your set top digital box is faulty.

Jun 25, 2010 | RCA Televison & Video

1 Answer

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.

Apr 23, 2010 | RCA HD52W58 52" TV

1 Answer

I have a 56" toshiba dlp. It has a red have throughout the screen. sometimes worse then others. Is it the bulb? color wheel? Is it something I can fix? Where do i get the parts.


This sounds like the alignment of the red beam is off. There is usually a configuration tool in the menu that shows a white cross in the center of your TV against a black backgound (if it's aligned properly). It's a combination of the red, blue and green light bars hitting the screen. You should be able to adjust the positions of these crosshairs for each of the colors and "fine tune" your picture. Some of the higher end TV's even do a grid with over 100 crosshairs to fine tune every few inches or so. Once you get the red beam in line with the others and save the settings you should be good to go!

Aug 27, 2009 | Televison & Video

1 Answer

Picture is now black and white


 First, confirm that the source is actually in color - try another channel or input device.
Next, check the settings of the color control - it may have accidentally been turned down. If your TV has some kind of automatic picture mode, try turning if off and adjusting the color control. Try adjusting fine tuning if you have such a control and the problem is with a broadcast or cable
 transmission.
At this point with a confirmed color signal source, there is a problem with the chroma circuitry.
Note that to the average person, the obvious question becomes: is my color picture tube bad? The answer is a definitive NO. It is virtually impossible for a defective CRT to cause a total loss of color. A defective CRT can cause a lack of a primary color - R, G, or, B or a short between two colors which will mess up the color but is not likely to result in a black and white picture.
Some possibilities in no particular order:

  1. Weak signal or defect in tuner/IF causing loss of signal strength.
  2. Coler killer set too high (internal control) if it has one.
  3. Defective part around the chroma chip/circuit. Faulty color oscillator.
  4. Bad connections in area of chroma chip/circuit.
  5. Defective chroma chip (don't suspect this first just because it is probably very expensive).
A service manual or Sams', DMM, and scope will help greatly in attempting to troubleshoot this unless it is an obvious bad connection. Try prodding the main board around the chroma chip with an insulated tool to see if you can make the color come and go.
I had one set where a $.02 resistor decided to open up causing just this problem - perfect BW picture, no color. Another had a coil with a broken wire.  


May 08, 2009 | JVC AV-36S33 36" TV

1 Answer

Screen looks like a picture negative, PIP works fine, sound fine


Sony's have dual tuning systems to allow for the separate PIP channel. The common problem on the Sony's is the circuit board and tuning module connections go bad. It is likely that the connections on the board or module were already in the decayed process and moving it just accelerated the issues that were inevitable.

The quick fix is to swap the PIP over to the main picture or to bus the antennae signal to the antennae B terminal thus bypassing the bad tuner module.

The recommended fix action is to have someone with soldering skills to remove the chassis, and locate all the cold and cracked solder joints, especially near the tuning modules. If this does not take care of the problem, the tuning modules will need to be removed for re-soldering on the actual tuner modules.

If none of the above works, then you can always use the audio/video outputs of a cable box or vcr to the a/v jacks of the tv, thus bypassing both tuners in the tv.

Apr 28, 2009 | Sony FD Trinitron WEGA KV-32FS100 32" TV

1 Answer

Tv out of tune


Hi...there,
Well, it's seems you got a busted Graphic AD board...

Jun 30, 2008 | Samsung SyncMaster 910MP 19" LCD Monitor

2 Answers

Tuning a Channel


why did it get the highest raiting?? it doesent even say a solution

Sep 23, 2007 | Philips 30PW633R 32" TV

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