[TV Repair] What should I do if the color of the TV is wrong? How to adjust the color of the TV when it turns green
How to adjust the color of the TV
1. Adjust the image contrast
Too much contrast will reduce the level of the image, make it appear stiff, lose many image details, and also A phenomenon in which the sound interferes with the picture. If the contrast is adjusted too low, it will also reduce the level of the image, which looks very laborious. Therefore, it is necessary to use the contrast knob correctly to adjust the six gray levels that can be clearly distinguished, so that the leftmost level is just not bright, and the last one. level brightness is appropriate. When the color saturation button is turned off, since there are different signal frequencies in the colors, their levels should be clearly distinguished;
2. Adjust the brightness and background color
Adjust the brightness knob of the color TV to make the brightness appropriate, neither too bright nor too dark, so that the eyes should not be tired when watching TV for a long time better. Then turn off the color saturation, so that the image has no color and appears black and white. For color TVs with hue knob, the hue knob needs to be adjusted to the minimum;
3. Adjust the horizontal sharpness
The contrast ratio can represent the picture tube under certain conditions The strength of the signal. When the contrast is adjusted, it means that the signal strength applied to the picture tube is appropriate, and the horizontal definition can be adjusted at this time. When adjusting the tuner knob or channel fine-tuning knob, carefully observe the horizontal clear pattern in the test chart, and try to make the fine vertical lines clear and identifiable, and there is no fringing and smearing. At the same time, the sound is also required to be good and not interfere with the image. In the color TV test chart, the position of the densest line that can be distinguished is as far to the right as possible, which means that the horizontal resolution of the TV is higher;
4. Adjust the color saturation
When adjusting the color saturation, first turn the color saturation knob to the minimum position, and then adjust the color depth according to the preferences of TV viewers. If the color is too strong, it will lack realism, and if it is too light, it will lose the meaning of color. A more suitable standard is: the skin color of the people in the image, especially the color of the hands and faces, should be close to the color of ordinary people, that is, the color saturation knob can be adjusted to make the color of the skin color close to the skin color of normal people. In addition, when adjusting the color, the frequency fine-tuning knob can be adjusted appropriately.
When the color of the TV is not correct, you can try it according to the above mentioned. Of course, if you can’t solve it, you should contact the professional and regular maintenance department for on-site maintenance.
What should I do if the color of the TV is wrong
1. The TV is colorless and becomes black and white
(1) The audio and video cables are connected incorrectly. Normal TV provides AV interface, DVD interface, component signal interface, S port. It should be ensured that the output interface of the set-top box is consistent with the input interface of the TV.
(2) The TV system is not properly tuned. The standard of ordinary TV in my country is PAL mode. Please check whether the TV is in AUTO/PAL standard. If it is incorrect in NTSC/SECAM standard, it needs to be changed.
(3) Magnetization. Degaussing is required.
2. Color cast
There are two cases of color cast. One is the overall color cast, and the other is the local color cast. If it is a local color cast, it may also be related to magnetization.
How to adjust the overall color cast of the TV
(1) Open the back cover. Generally, there is a circuit board on the rear seat of the picture tube. Five potentiometers can be easily found. It should be like this under normal circumstances. It is driven by two colors and adjusted by three color base levels. It is usually an English sign, which is not too difficult to understand.
(2) Set the brightness of the TV to be darker, turn off the color completely to black and white, and adjust the base level of the two colors. It is very simple. If there is more red, reduce red, and if there is more green, reduce green. Much the same. Anyway, it’s just white.
(3) Then set the TV brightness to the brightest, adjust the two color drivers, the adjustment method is the same, but it may be missing a color, at this time you can increase or decrease the Just two colors. After the adjustment, return the color and brightness settings to normal, and the color of the TV will be pure.
(4) This method is very useful for the color cast of old TVs, and it is not too difficult, just pay attention to the high voltage on the high-voltage cap of the display tube, and there is a focusing voltage line on the display tube base from the high-voltage package. There is high pressure, be careful.
3. How to demagnetize
The magnetization of our TV above can easily lead to abnormal TV color. So how to demagnetize it?
(1) First of all, check whether there are some electrical appliances with strong magnetism near the TV, such as refrigerators, the door seals of the refrigerators have strong magnetism, which will make your TV set. Screen magnetization. If there is indeed a magnetic object on the side, turn off the main power, instead of using the remote control to turn off, turn it on after 30 minutes.
(2) Move the objects that are considered magnetic around them by 2 meters away.
(3) Turn on the magnet and place it on the screen to demagnetize it.
(4) Use degaussers, which are generally available in electronic component stores and are not too expensive.
(5) If it can’t be solved, the degaussing resistor in the TV is broken and needs to be replaced.
4. Color cast caused by TV aging
If it is not magnetization, it is likely because your TV has been used for a long time, and the color cast is normal. . If you have a certain basis for electronic maintenance, you can disassemble the TV. There is an S repair switch on the circuit board, hit it to the repair place, and you will see a horizontal bright line when you turn it on. Then adjust the 3 RGB potentiometers on the tail light board, and slowly adjust the potentiometers in turn. While watching the horizontal bright line color. It is better to adjust to the whitest.
5. The color of the TV turns green
Why does the TV screen turn green? There are three main reasons why the TV turns green:
The first reason for the TV to turn green is that the TV is magnetized. If you find that a certain part of the TV is green, you may try to remove the TV. , perform degaussing work. See if the green patch is still there. Usually, there will be things with magnets accidentally placed next to the TV, just remove these things.
The second reason why the TV is green green.
The third reason why the TV is green Green question arises.
How to solve the problem of TV turning green?
Once we have a general idea of why the TV turns green, we can know what the repairs are about. Generally speaking, if it is a magnetization problem, just demagnetize it. Degaussing can demagnetize the degaussing function that usually exists inside the TV. You can also turn off the power, wait 15 minutes, turn it on again, and then turn it off. Repeat this for about 3 times. Demagnetized. Of course, the premise is to take the items that affect the magnetization of the TV away from the TV, especially speakers, magnetized cups, etc.
If it is other reasons, it is best to find a qualified maintenance master to carry out maintenance, mainly check the video amplifier board, picture tube, color decoding circuit, electron gun filament power supply and other problems to find the reason why the TV turns green. Generally, the repair cost of these TV failures is very cheap, absolutely not 100 yuan, depending on the size of the TV or the different parts, the price is slightly different, 30 yuan, 50 yuan, 80 yuan, generally these three grades. [Top Ten TV Brands]
