No standby indication
In a situation where there is no indication, and when you press the button, nothing happens, you do not hear clicks and do not notice the blinking of the LED, then we can assume that the outlet is faulty. Of course, you can try to connect the device to a different power source, but if this does not help, then, without special knowledge and qualifications, you cannot repair the TV receiver with your own hands. Even replacing a conventional fuse will cause you difficulties, since they are not so easy to find in modern TVs. Therefore, calling the master will be the right decision.
The indicator flashes randomly
This behavior of the indicator indicates that a malfunction has occurred in the TV set, and it does not carry any more useful information. Full diagnostics of the electronics will be required, starting with the “ringing” of the power supply and ending with the converters on the system board.
When the help of the master is not required
Very often, the owners of TV sets panic and start calling the master at the slightest problem with their device. But if you calm down and take a sober look at the situation, then there may not be a breakdown in equipment. It is required to check the behavior of the TV set for some symptoms.
The device did not turn on from the panel
If it was not possible to turn on the TV from the control panel, then it is necessary to observe the behavior of the standby indicator (it normally lights up with a steady light, more often. red). If it turns off when you try to press the button, then the problem should be looked deeper in the device, since this indicates the activation of the internal lock (not to be confused with the child lock mode, which is activated by the user). This happens when one of the modules fails. In some TV models, when the lock is activated, you can hear a clicking sound. You cannot fix such a breakdown with your own hands. The only reasonable way out is to call a specialist.
Power button on a Samsung TV panel
Mains cable and socket
First of all, you need to check the condition of the network cable and socket. The first one is visually inspected for physical damage. The outlet can be checked by connecting another household appliance to it, for example, a lamp.
If the technique turns off almost immediately after switching on, then the matter may be in the button. Other symptoms of the latter’s malfunction are a loud click when activated and an inoperative indication. You can replace the power button yourself, fortunately, many manufacturers have implemented this feature in their models.
Rain, heavy snow and other bad weather affects the quality of the broadcast signal. Ripples, artifacts, or noise appear on the screen. It is necessary to wait until the end of the bad weather, and if the situation has not changed, then check the antenna (plug, cable, housing).
Inoperative remote control
In the case when you observe the indication, but the TV does not respond to commands from the remote control, then you can try to turn on the device using the control panel on it. If you succeed, then the remote control is faulty. Although, in principle, it cannot break, except that a quartz resonator can break from a fall, which will have to be replaced. Most often, batteries sit down or run out in the remote control. In any case, you should disassemble the remote control and try to fix the malfunction of the remote control with your own hands.
Power surges are one of the most common causes of TV equipment failure. Boards and individual components can burn out and give off a specific odor. You can catch it by sniffing the back of the TV.
Cathode-ray tube resource
In CRT televisions, the image is projected onto the surface of a cathode ray tube, which has a limited lifespan. With long-term operation, the resource of the kinescope is developed, while it is noted:
- reducing the brightness and saturation of the image;
- uneven glow of the tube surface;
- increase in the time of image appearance after turning on.
Currently, CRT models are outdated. Therefore, when developing their resource, it is more rational not to try to repair them, but to take a closer look at modern models.
TV turns on for a long time: main reasons
As a rule, the process of turning on the TV takes no more than ten seconds. Over time, some users note an increase in turn-on time to a minute or more.
Even if the TV works normally after a long time, you should understand that something is wrong with your device. If possible, you should contact the service center to avoid more serious troubles. Modern television technology is the most complex electronic system, with a huge number of interconnected elements. For example, if one failed capacitor is not replaced in a timely manner, this can subsequently provoke the final failure of the entire device.
Experience shows that there are several main reasons why the TV turns on for a long time:
- the resource of the cathode-ray tube is exhausted (only for CRT models);
- malfunctions in the power supply;
- failure of the inverter;
- problems with the image scanning system.
Scanning system problems
The image scanning system consists of line and frame scanning, and as the name implies, it is responsible for the direct construction of the image on the screen. Problems in the operation of these elements are also signaled by: instability of the image on the screen, absence or incorrect display of pixels of some rows or columns.
Why does the TV turn on for a long time
Most of humanity spends their evenings in front of the TV. So you come home, turn on the TV as usual and notice that the image appears much longer than usual. Why is this happening? Is this a malfunction and what to do in this situation?
Failure of the inverter
The inverter is responsible for the operation of the backlight system in LCD TVs. It controls the brightness of the LEDs. If the inverter fails. the intensity of the screen luminescence is disturbed or the time for the appearance of the image after switching on increases (the sound can appear much earlier than the picture).
Faults in the power supply
Power supply unit. provides energy conversion of the electrical network and its distribution across all elements of the device. This is the “heart” of the TV. Power supply faults are of two types. Some are associated with the development of a resource, others with the failure of individual components.
Almost all power supplies contain electrolytic capacitors, which eventually lose their capacity. As a result of this, the time for supplying power to the components of the device increases, and, accordingly, the switching process itself.
In addition to the natural aging process of the elements of the power supply, its components often fail due to voltage surges in the power supply. This circumstance can lead to an extended turn-on time of the TV, and may also be accompanied by extraneous noise during operation and image flickering.
Faults in the power supply unit over time can lead to failure of other elements of the device and its final breakdown.
What to do if the image does not appear immediately when you turn on the TV
If, when you turn on the TV, the image began to appear with a delay, this indicates minor malfunctions, which, if left untreated, may eventually lead to the failure of the device. The main advice. if you are not a repair specialist, do not try to fix the problem yourself, but contact a specialist.
Malfunction in sound
Here are the common audio problems on the device:
- Speaker malfunction.
- Breakdown in the amplifier. it can burn out due to the same voltage surge.
- Also, without checking, problems with the radio channel (that is, with the sound source) cannot be ruled out.
As you can see, none of these troubles can be the reason for the absence of a picture on the screen.
It is very important during the initial diagnosis not to become the hero of the anecdote about the car owner, who was looking for a malfunction in an idle engine and completely disassembled it. Then it turned out that the gasoline SIMply ran out.
It is quite possible that the receiving and transmitting antenna of your settlement is currently being reloaded, as a result of which the signal is completely absent. So before delving into the microcircuits, it is strongly recommended to look at your neighbors and ask if they have a TV signal.
When a processor breaks down in a modern TV, the image does not initially disappear. It is distorted, vertical color metamorphoses appear, turning into horizontal stripes. over, as a rule, the soundtrack also gets confused. But with a broken processor, the matrix does not remain dark (and also with no sound).
The processor itself, in turn, may have a number of malfunctions, which require special diagnostics to identify. However, the processor never causes a dark screen with a green device activation indicator.
This category includes the following types of defects that arise:
- Cooling system problems.
During operation, the matrix heats up due to the currents flowing in it. To prevent overheating, the TV has a cooling system that removes heat to the radiator. The cooling system is air, and therefore dust accumulates on the radiator, which reduces its heat-exchange capacity. Overheating can cause the TV to turn off suddenly and even though its activation indicator turns green, no picture will appear on the screen. To eliminate this malfunction, you need, firstly, to eliminate dust pollution from the radiators, and secondly, to replace the thermal grease under the central chips.
- Receiver and antenna defects.
This problem is solved by checking the quality of the cable contact connection between the receiver (or antenna) and the TV input. But this defect cannot be the cause of the dark screen. Even if the receiver is to blame, the screen will still glow (show “snow”, but glow). This defect cannot be the cause of the problem described in the introduction.
Philips brand TVs
The most common problems with Philips TVs are related to:
- sudden image distortion during broadcast;
- the device stops responding to commands from the control panel;
- the brightness of the picture decreases significantly.
In the first case, most likely, problems arise in the microcircuits. In the second. (if it’s not banal dead batteries in the remote control) we are talking about problems with the built-in memory. Finally, if the picture becomes less saturated, then this, as a rule, indicates a problem with the internal backlight of the screen.
However, none of these defects can cause a dark screen when turned on. This problem is not typical for Philips.
Samsung often “suffer” from bugs in the firmware. And in this case, spontaneous shutdowns of the device can really happen here with a refusal to turn on later. However, this effect does not appear immediately: at first there will be a freeze in the playback of the picture, the image will, as it were, slow down a little. Sometimes the device will reboot repeatedly. And the refusal of work is already the final stage. To eliminate this breakdown, a professional software reinstallation is required.
Malfunction in voltage
The standard line scan voltage of the TV is from 110 to 150 V. Next to the pulse transformer of the power supply (which is in an LCD TV, which is in a CRT) is a filter capacitor (its capacity is most often from 47 to 100 μF, and the voltage is 160V). In the immediate vicinity of the filter, there is a power rectifier for horizontal scanning. Thus, the voltage, bypassing the filter, goes through the choke to the output stage, and then to the limiting resistor (fuse). If the last element is disconnected (unsoldered), the horizontal scanning stage will be disconnected from the power supply and, thus, conditions for verification will be created. A load SIMulator should be connected in parallel to the capacitor. an incandescent lamp will suffice. Further, when enabled, the following results are possible:
- Due to the presence of defects in the piping elements, the key transistor of the power supply may fail. In order to eliminate this, you need to add another incandescent lamp with a power of 100-150 W to the circuit, which must be connected instead of a sealed cascade.
- If there are faulty elements in the circuit, the current consumption will be greater than the calculated one. The lamp will begin to burn much brighter, aggregating all the load and all the voltage on itself. Here you already need to carefully check the serviceability:
- input circuits;
- network rectifier;
- power supply transistor;
- filter capacitor.
If there is no defect in the power supply, measure the input voltage across the load (on the lamp). Usually there is an output voltage adjustment resistor next to the remote stage, and next to it is an indicator of the allowable range. for example, from 110 to 150 V. Compare this information with what the voltmeter on the light bulb gives you. If the actual voltage is higher than the specified range, then again, you should check the continuity of the power supply and feedback circuit. (The latter serves to stabilize the output voltage).
Again, electrolytic capacitors should be checked. When they dry, the capacity decreases significantly, which leads to incorrect operation of the circuit and an increase in secondary voltages. the TV, as a result, will not turn on.
At the same time, when turned on, the supplied voltage is not enough to power the screen, but its drop changes the color of the LED light. As a result, we have that the indicator is green, but the TV does not work.
The problem is in the matrix
Here it seems reasonable to go from the opposite and, listing all the main effects of problems with a television matrix, highlight the one that meets the introductory conditions. So, the TV has problems with the matrix if the following effects are observed:
- On-screen “snow”, when the image is only guessed due to thick ripples. In order not to be mistaken in the diagnosis, you need to check the antenna.
- The image is blinking. Most likely, the backlight is “covered”. In addition, there may be problems in the cooling system.
- Stripes (vertical or horizontal). The matrix line scan module is faulty here.
- Broken Pixels. Typical Matrix Failure.
- Confusion with colors on the screen. Color rendition “goes crazy” usually when there are problems with firmware.
- One or more colors are missing. The chromaticity block of the matrix or the amplifier is faulty here.
- Wide one- or two-color. Check the integrity of the connection between the matrix and the motherboard. The train can be corny broken.
- Static stripes in one place on the screen. Here the problem is in the correct operation of the signal decoder or the matrix scanner driver.
And finally, if there is no image at all (when the TV on indicator is green), then it is possible that the problem lies in the burned out capacitors of the motherboard.
That is, if the indicator indicates that it is on, but the screen is dark, then the matrix here is most likely not to blame.
Why does the TV not turn on, but a red or blue light flashes
You can’t imagine anything worse when you don’t know what to do with a complex, smart, but at the same time non-working technique. The point is that a familiar electronic device gives standard signs of “vital activity”, however, the entire device as a whole does not function as expected (and does not even turn on). It is not clear what to think: whether to let the smart electronic device “hang a little”, or to rush to call the master, or to raise your own qualifications to the level of the end of primary classes. But, as a rule, you want to watch TV in order to relax, but here you have to strain. So, let’s consider a specific situation: the TV does not turn on, the indicator is on. what to do?
Extraneous sounds when the TV is not working and there is no indication
Sometimes TV owners are faced with the fact that there are clicks or other sounds inside. Symptoms may vary:
- The TV did not turn on, the indicator blinks, the relay clicks.
- The light is off, the TV clicks.
- The TV beeps and does not turn on.
The most common causes of clicks on TVs are:
- Interlocking system actuation. In the event of some types of malfunctions (power supply or other units), the protective function is activated. It is designed to avoid more serious damage in the event of a malfunction. It is the blocker that emits characteristic clicks when the TV tries to turn on.
- Heating and cooling of the plastic parts of the case. So, even a working TV can click.
- Giving a signal about an activated (long not used) operating mode for the selected source. At the same time, TVs can beep or whistle.
- Excessive load on the power supply. The cause could be a transformer, microcircuit, or transistors. In this case, the TV does not turn on at all. You can’t do without a qualified master here.
Common causes of malfunction
The problem can manifest itself in several ways and is shown by the following possible symptoms:
- LED indicator flashes but TV does not turn on.
- The indicator lights up red, and the device is not controlled from the remote control and does not turn on at all.
- The indicator does not light up, and the TV does not turn on from the remote control.
- The TV clicks, hums, makes strange sounds, but does not turn on.
Malfunction of processor or control
The diagram shows that the LED indicators are controlled via the Stand By wire and the Q211 transistor. When a short occurs, the TV stops turning on.
In such a case, it will not do without contacting service specialists. Attempts to carry out complex repairs on your own can completely damage the TV.
- Why does the TV turn on and off immediately: reasons and what to do?
- Do-it-yourself TV repair: LCD / LCD, plasma and kinescope. Schemes, and secrets of repair.
- Do-it-yourself TV remote control repair. And. how to fix remote control buttons.
Why the TV won’t turn on, and what action to take?
Like any technique, it is common for a TV to malfunction, and regardless of the period of its operation. For example, in some cases, the TV does not turn on, but the indicator blinks and the relay clicks. Many other symptoms are also possible. So, let’s look at why the TV does not want to work, and what to do in certain cases?
- Common causes of malfunction
- Indicator flashes
- The indicator is on continuously
- The indicator is off, the TV does not turn on
- Extraneous sounds when the TV is not working and there is no indication
- TV does not turn on, protection is activated
If the indicator flashes, then the TV itself diagnoses the type of problem. Usually the red light will flash a certain number of times. In this case, you need to open the operating instructions for the device and find the section where the types of faults and their indication are indicated. And, already based on this, take the necessary actions.
Another option that can cause a SIMilar symptom is that the TV is connected to the computer as a monitor. If the connected computer enters “sleep mode” or is disconnected, when turned on from the remote control, the device will flash for a few seconds. Alternatively, the TV is connected by a second monitor, but not as the main one.
You need to take the computer out of Stand By mode (move the mouse or press a button on the keyboard) or start it by pressing the power button. Basically, the TV is working. It’s just that the image is not fed to it.
The indicator is off, the TV does not turn on
Such symptoms most often indicate that the cause of the malfunction is a lack of power. If the light bulb just “burned out”, the TV would work in normal mode, but without indication. Do not worry ahead of time and call the master. Initially, you must exclude all variants of the problem that are available for self-correction. over, in a large number of cases the problem is caused by rather trivial reasons, including:
- There is no power in the electrical outlet. The circuit breaker in the dashboard may turn off, or the outlet may be faulty. It is checked using a conventional indicator screwdriver or a tester. If there is no power supply, the machine is inspected. Even if it is turned on, it is better to “click” it several times. Did not help? You need to look for the problem in the outlet or wiring yourself or with the help of an electrician.
- A defective extension cord (if connected through it). When a direct connection to the outlet ensures the normal operation of the TV, and there is no power through the extension cord, it is in it. If it is a power filter, you need to check the power button and fuse. In any case, a working device is required to fix the problem.
- The “Network” button on the TV is turned off. On almost all models of modern TVs, when the “Network” button is disabled (it can be located on the bottom, side or on the back of the TV), it becomes impossible to control the device from the remote control. It is necessary to activate the On / Off button on the control panel.
- Wrong mode selected. The TV in this case works absolutely fine, but if one of the modes is not used, for example, AV, PC or Receiver, the screen dims and can enter “sleep mode”. Select the TV function again and the picture will return.
- Malfunction of any part. It may be a microcircuit or a capacitor, or perhaps a power supply or control system (for example, a button has broken). It is better to entrust the testing of the performance of various components of the TV and the implementation of the necessary repairs to the specialists of the corresponding service center.
- Blown fuse. For CRT TVs, this is the actual reason for the lack of power. If it is located in an accessible place, it is quite possible to replace it yourself.
The indicator is on continuously
If the LED is on, this indicates that the control unit is receiving power. If the TV does not respond to signals from the remote control, the first thing to do is try to turn it on directly using the panel buttons. Perhaps the malfunction lies precisely in the incorrect operation of the remote control, and not the TV itself. If this is the case, the following actions should be taken:
- Check the health of the batteries and contacts for oxidation.
- Make sure that the emitter is intact and that the remote control buttons are not sticking.
- If possible, disassemble and clean the remote control inside from dust.
- If the remote control was flooded with liquid and stopped working, return it for repair or purchase a new one (preferably the original one. it will last longer).
If it was not possible to start the TV from the panel, two scenarios are likely.
In this case, the TV may try to start, but after a few seconds the screen goes out, or it does not turn on at all. The main cause of this problem in most cases is power outages in the home network. This can be voltage drops or power outages and turns on when the TV is in “sleep mode”.
The most effective way to solve the problem is to completely disconnect the device from the network for a while, and not with a remote control, but unplug the power cord from the outlet. This will be enough to restore functionality if the TV does not turn on after turning off the light. If the problem with the voltage is constant, you will have to use a stabilizer, an uninterruptible power supply, or at least a surge protector. And when leaving home, it is better to completely turn off the TV.
TV does not turn on, protection is activated
In this you will clearly see how the protection works when the TV does not turn on. In this case, the wizard tells how to fix the problem.
If the TV does not turn on, this does not mean that it is defective. First, it is worth diagnosing to establish the cause. If a complex problem is established, for example, a breakdown in the power supply, it is worth contacting qualified, or better authorized, service assistance.
What to do if the TV won’t turn on
Since television became widely available for every family, it is difficult to name a more popular way of spending family leisure time (and even the Internet cannot change this). But what if the TV suddenly stopped turning on? The first, and most important, advice is to not panic. If your brand new LCD TV or an equally expensive plasma version does not turn on for some reason, this does not mean that you need to call specialists. Nowadays, there are different repair teams, and you can rest assured that unscrupulous representatives of this profession will certainly take money from you even if the equipment was absolutely serviceable.
Therefore, you must first conduct an initial inspection on your own. Most malfunctions can be dealt with without special skills, using instructions from experienced people. It is possible that the problem lies in such trifles as an incorrectly selected mode, an accidentally pressed button, or problems with electrical wiring. To begin with, it is worth clarifying that the approach to different types of TVs is slightly different. The most common are:
- Liquid crystal (LCD);
- Picture tube.
But since you do not need to carry out direct repair of equipment, the difference will be insignificant. And the tips you can use to fix your LCD TV are also good for other technologies.
If you have purchased a new TV and it does not turn on from the first minutes of being in your home, the source of the problem should not be found in the device itself. The likelihood of defectiveness is very low, as all reputable manufacturers carefully check all their equipment before sending it to distributors. Most likely, the matter is in a wrong connection, a malfunction of the remote control or an error in control.
Read the instructions carefully and try again. For example, the problem might be with the power button, which might be disabled. If the power indicator is on and does not blink, then everything is in order with the power supply. If the light shows no signs of life, the problem might be with the power button or wiring. Carefully examine the cord and outlet, you can also check the voltage with a screwdriver, which has a built-in indicator. If the light blinks intermittently, it is possible that the contacts are moving away. In some cases, the indicator blinks when the light bulb is out of order. you can temporarily ignore such a problem. If no problem is found and the TV still won’t turn on, the problem is different.
Incorrectly selected mode
If the TV does not turn on but the indicator is on, power problems can be avoided. The problem may be with the wrong mode. Every modern LCD TV is equipped with a variety of modes:
- Game console.
And many others. Read the instructions and study each mode carefully. It is possible that your TV is in standby (sleep) mode. It is quite easy to determine this. the screen goes out in this state, and the indicator glows red or green.
Then check the rest of the modes. Some LCD models have a dedicated button to determine the current status. If you have selected the DVD player or game console mode, you will see only an extinguished screen and a lit indicator. Check the jacks into which the plugs of the set-top box or player are inserted. if the mode is selected and the devices are not connected, the screen will automatically go out.
The source of trouble can also lie in the breakdown of the remote control (RC). Press the power button. if the indicator blinks, then there is no doubt that the remote control is working properly. If the indicator does not blink and does not react at all, it is worth checking your remote control. It may be sufficient to SIMply replace the remote control batteries. If there is an identical remote control nearby, you can check that too. If the TV still does not turn on with the remote, try turning it on with the button on the dashboard.
Sometimes, in the event of a breakdown, the speaker emits characteristic sound signals. beeps, clicks, etc. If the speaker beeps when you press a button on the remote control, then the remote control is working properly, and the problem is different. Sometimes you may come across a modern LCD TV, which beeps when the mode is incorrectly selected and there is no connection with the player or set-top box.
If the image does not turn on even with the button on the dashboard, most likely the problems are inside the device. Modern LCD devices are distinguished by very complex technologies, and it is undesirable to try to fix them on your own. Listen. if something clicks in the back of the case, it could be a built-in blocking module. Very often it is he who becomes the cause of all problems. This module always clicks when activated, and if you hear such a click, you will have to call a specialist.
In the case of old CRTs, the “root of evil” was usually hidden in the fuse, and if you had certain skills, you could replace it yourself. But modern LCD products are created using a completely different technology, therefore, in the absence of special knowledge and skills, you will have to contact the specialists of the service center. We are talking about a fairly expensive sample of household appliances, and it is not worth risking such big money.
Recommendations for those who know how to hold a soldering iron in their hands
Among the reasons why the TV stops turning on, employees of specialized service centers call breakdowns of almost all main blocks. pulse power supplies, photodetector modules, motherboards (Main Board or SSB) and backlight control inverters. They also note that the lion’s share of faults of this kind are due to faults in power supplies. For this reason, the first thing that needs to be done after the initial diagnostics (checking the voltage in the outlet, “ringing” the cord and replacing the mains fuse) is to examine the TV’s power supply unit according to the following scheme:
- Conduct a visual inspection for microcracks, chips and cold soldering, and then correct any deficiencies found.
- Replace any swollen capacitors identified during visual inspection.
- If, as a result of the inspection, burnt or damaged resistors were found, then it is necessary to carefully check the circuits in which they are installed. In the case when voltage dividers were built on these elements, the serviceability of the transistors, diodes and other semiconductor devices located next to them should be checked.
Most likely, fixing the breakdowns revealed during the initial inspection will be enough to make the TV work again. If the miracle did not happen, then further diagnostics are carried out by inspecting the fuse. Its repeated burnout may indicate a breakdown of power transistors or rectifier bridge diodes. In addition, the semiconductors on which the PWM chip is strapped should be carefully checked. The microcircuit itself is checked by replacing it with a new or known serviceable part.
The TV power supply is easy to detect. it is indicated by the presence of winding units (transformers, chokes) and high-capacity capacitors
Modern LCD and plasma TVs, in addition to the main power supply, also have an additional standby UPS. This module is constantly under voltage, since it powers the circuits responsible for turning on the device from the remote control. The output of the additional power supply unit must have a low-voltage voltage, which is necessary to power the IR receiver and to maintain the processor in sleep mode. Often, after many years of operation, the capacitors of the network module dry up, lose their capacity, “go into a break”, or even begin to work in diode mode. Of course, after the storage elements fail, the voltage conversion process becomes problematic, and starting the TV is impossible. Before you start looking for replacement parts, you need to keep in mind that pulsed power supplies have a high-frequency mode of operation. Because capacitors filter high frequency pulses, parts with low series resistance (called ESR) should be selected. During operation, they will heat up less, which means that after repair the TV will last much longer.