Causes damage to CRT and plasma TVs are often different.
CONTENT
- 1 TV diagnosis, if the image is lost while maintaining sound
- 2 What should I do if there is sound but no picture with the problems of a certain type
- 3 Simple actions that you can do yourself
TV diagnosis, if the image is lost while maintaining sound
The problem of broken picture on the TV is found in virtually all brands of TVs: Samsung, LG, Philips, Sony and others. In this case, it is important to correctly diagnose the problem. By doing this, we can only make educated repair. It is the accuracy of the determination of the cause and determine the effectiveness of further service.
Self-diagnosis of TV
Anything that can make a fan with its own revision of the TV is to perform a visual inspection of all relevant parts. Also allowed to disassemble the unit and clean it. At the same time, look closely at the state boards. Often, the problem is found in capacitors. However, it should be noted that self-interference device may completely withdraw from the TV building. Therefore, it is better to entrust the work to professionals.
For television, to address the lack of images is not recommended to use aggressive tools.
Professional Diagnostics domestic TV device
If the study of problems are handled by experts, then surely they will quickly identify the problem by continuity of all contacts, and significant parts of adhesions on the boards. In addition, triggering a professional diagnosis, the owner of the TV will receive a guarantee of quality work. The wizard searches the fault with the help of special tools and often find the problem in the first few minutes.
Work with internal TV components necessary only when it is disconnected from electricity.
What should I do if there is sound but no picture with the problems of a certain type
When the TV is converted to radio, it is to put it mildly, frustrating. However, in order not to aggravate the situation, this failure must be addressed. As a rule, are engaged in repair after clarification of the problem. Consider the cases in which intervention is required and how it is performed.
If on the screen there is snow, it is possible that this is due to lack of signal in the program.
Network problems
If the image on the TV screen, then in the first place, it may be associated with a poor Internet connection (typical for those times when the film is viewed through the Internet). Also, the loss of the image on the TV may occur due to insufficient Wi-Fi signal.
No image is often associated with low speed Internet access, or no connection to it.
Partial or complete detachment of damaged cable
Loose cable connection to the TV sockets, precisely, could entail a loss of image, but not the sound. To verify this, experts recommend when to pull the TV is turned off and re-insert the plugs of the antenna wires and electric cables to connectors.
Check each wire for oxidised.
If the video signal is lost, you should try to restart the console, check the connection strength HDMI cable or wires, synchronizing the two devices. Typically, the problem is solved by replacing the connection cable.
Small tear the wires can be removed with their own hands, if it was not in the connector housing.
If the "loosening" of the electric wire connector, it is necessary to change urgently. Even the slightest damage to the cable insulation is dangerous for future use. It threatens not only the closure of TV contacts, but also give a person an injury.
Inverter Failure
Usually, the problem faced by owners of the inverter failure TV brands Samsung, LG, Sony, Sharp and others. Signs of this are: a strong distortion of the screen. The sound may appear right away, and the image - with a delay of a few minutes. Repair the inverter can use the soldering iron and electronics knowledge. It is important to perform a careful and competent solder.
The inverter is a large board with a plurality of parts. Determine what is broken on it, it can only be a specialist.
Faulty power supply
This problem often has similar symptoms as the failure of the inverter. However, here we must prozvanivat each contact on the board. Step by step, do the following:
- remove the housing cover, and then inspect the integrity of the conductors, the presence of wrinkles and visible damage to them;
- pay attention to the capacitors. It is essential that no bulging parts (hereinafter they may burst and harm the TV);
- test voltage of a special tool. It should not deviate from the standards specified in the documentation for the TV;
- it happens that the TV responds to all sorts of tapping. This indicates poor contact in the power supply, so the contacts you need to carefully check and, if necessary, redirect to better.
In a television power supply often have problems with stitched capacitors.
Ideally, better to replace a power supply. But, it will be cheaper than a new machine.
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Perform the TV check is recommended in the off state. Include it is allowed only in case of replacement of each part in turn. However, the abuse part of the boot is not worth it!
Damage to the TV matrix
Malfunction matrix is ​​considered to be the most unfavorable problem. To replace it you will have to prepare for the repair of a considerable sum. Sometimes, it is better to buy a new TV. The defect of the matrix may occur in the case of careless owners action: strikes, damage indentations. Less commonly, equipment breaks down at the factory marriage. To detect such a problem can be by skipping the picture image on the screen floor, or the appearance of vertical stripes in different colors.
When you break the matrix of a clear visible dent at the injury site, and, the image is completely absent.
damage to the video processor
Breakage of the video may be gradual or simultaneously. Often it is accompanied by the following symptoms:
- the appearance of color distortion and incorrect colors display;
- the disappearance of one of the colors;
- the sound may be accompanied by inhibition of the image or just a blue screen.
Molten video processor can "pull" for a breakdown of other parts of the TV.
This problem is easier to solve by replacing the video processor to the next.
It does not work Backlight unit: the main features of
Suspect backlight failure is possible only in the event that the screen does not respond to the picture. When this sound is heard well. You can try to hold its own diagnostics. To do this, switch on the TV at night or move it to a dark room. Then bring the torch close to the screen and turn it on. In the place where the incident light rays will be a small image with contrasting squares. For replacement parts is better to contact the service center.
The backlight unit of the TV in the operating state, each lamp should burn.
Partial or complete loop strain
Zephyr is located on the matrix, and it easily breaks down after frequent sloppy TV transport, as well as in the case of long-term use without maintenance. To determine this problem come to the aid of these signs:
- periodic appearance of horizontal stripes in the middle of the screen or on its individual sections;
- occurrence of ripple and noise in the qualitative digital or analog signal;
- screen duplication in any order or downloading a thumbnail from one zone to another.
In the case of appeal to the repair center, the master will make a complete replacement of parts or resolder existing loop. Actions are executed depending on the wishes of the owner of TV and the availability of funds for repairs.
Damage to the loop is possible only in case of wear or intentional damage.
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In the case of partial absence of the image can be suspected of burning out some screen colors. This usually occurs if the TV set in a place where the screen is under direct sunlight.
The distortion of the image when a fault block horizontal scanning or HR
Often such damage may occur in the CRT TVs of modern brands. To test this, you must first diagnose the lowercase, and then frame progressive.
Personnel unfolding often suffers on CRT TVs, but also occurs in the LCD.
In the first case, it is necessary to conduct an audit of the output transistor, flyback transformer and cascade multimeter. Since the sample is determined by the deflecting coils of line type.
In the case of test personnel scan, it turns the power efficiency of the master oscillator, checking for an open rectifier diode and study personnel scanning circuit.
Violation of the convector
Such a defect may occur if there is no picture on some channels. It may not appear as its own and together with sound. If other programs are running in normal mode, then the matter is in the head of the convector antenna.
If the antenna is an open-air place better closing plugs joints against humidity.
Make sure that these channels are no prevention, and then go to "Keys and frequency" or to the properties of the satellite dish and decide which satellite it serves. Thus be able to figure out what kind of head to be replaced.
For proper settings of the signal is necessary that all the heaters have been directed to a satellite in a corresponding degree.
Repairing this part is meaningless, therefore, better to turn to the nearest radio store and buy a new convector.
Damage to the TV decoders
The presence of broad bands on the TV says it is a failure of the decoder. Either it happens dysfunction loops contacts. Typically, this situation requires a complete replacement of all hardware innards TV. In such a case would be to buy a new device cheaper.
Damage to the decoder is often accompanied raspolovinennym screen.
Swelling of the capacitor body: the way of repair
Failure of a capacitor on an inner board accompanied by loss of the TV image on the monitor receiver. Usually the sound is working at full capacity, but the image is not visible immediately after the launch of the device. What can we do for the diagnosis:
- Open the rear cover of the TV, and to consider carefully all of the capacitors.
- Be sure to check the capacitors to the touch as well as a visual defect can be invisible.
- Upon detection of bloated parts, they should be replaced with new ones. Analogs can be purchased at Radio Shack, but be sure to remember the exact model of TV.
Bloated capacitor often affects not only the image, but also the ability to control with the remote.
Capacitor breakdown often occurs during sudden surges. Therefore, to protect your TV from damage, it is best to buy a special filter and stabilizer.
Condenser capacity must be sufficient so it is best to photograph the board, and then go to the store for details.
Simple actions that you can do yourself
If you do find a problem of breakage of the TV screen, you can perform some manipulations, which are likely to help solve the problem, if it lies on the surface.
- Try turning off the power, and start again in a few minutes. If there was a software glitch, the TV will recover.
- We are trying to re-connect the antenna cables to the connectors on the rear panel of the TV. Perhaps somewhere there is a defect in wires or plugs.
- If the image is lost when you try to connect any other electrical appliance, then the problem is in the power surges. It is an opportunity to purchase a stabilizer.
- If there is no picture on the TV, start the volume to the limit for a few seconds, and then return to the desired range. A few minutes later the image appears.
Control may not be available in the event of damage to the screen, so sometimes you have to "play" button.
In today's post we detailed all the reasons unusable images on a TV. If you have any questions or you had to carry out repairs yourself, write in comments, and share your opinion.
