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

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.

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.

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.

try going into the menu and choose factory reset then choose auto tune all channels

good luck

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.

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!

satelliteand cable TV is only comes in black and white.
this a HTML type plug or a coaxial
select menu and source
very weird... should default to colour

if no luck try plugging in a desk top digital box tune using that

TH-42PX20 TH-50PX20 Operating Instructions High Definition Plasma ...

ftp://ftp.panasonic.com/television/om/th-42px20_en_om.pdf

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.

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

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