From the moment that television has become widely available for every family, it is difficult to name a more popular way of spending family leisure time (and even the Internet is not able to change this). But what if the TV suddenly stopped turning on? The first and most important tip is not to panic. If your brand new LCD TV or a no less expensive plasma version for some reason does not turn on, this does not mean that you need to call specialists. Today, there are various 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 in good working order.
The TV may be working and not turn on due to a malfunctioning remote control. What to do in this case can be found in the article: https://tehznatok.com/qa/pochemu-televizor-ne-rabotaet-ot-pulta.html
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 improperly selected mode, a randomly pressed button or problems with the wiring. First, it’s worth clarifying that the approach to different types of TVs varies slightly. The most common are:
- Liquid crystal (LCD);
But since you do not need to directly repair the equipment, the difference will be negligible. And the tips thanks to which you can fix the LCD TV are quite suitable for other technologies.
If you purchased a new TV, and it does not turn on from the first minutes you are in your home, the source of the problems should not be sought in the device itself. The probability of marriage is very low, since all reputable manufacturers carefully check all their equipment before sending it to distributors. Most likely, the matter is a wrong connection, a malfunction of the remote control or a control error.
Read the instructions carefully, and try again. For example, a problem may be with the power button, which may be turned off. If the power indicator is on and does not blink, then everything is in order with power. If the indicator does not show any signs of life, the problem may be with the power button or wiring. Carefully examine the cord and the socket, you can also check the voltage with a screwdriver, in which the indicator is built-in. If the lamp blinks intermittently, it is possible that the contacts are moving away. In some cases, the indicator blinks when the bulb is out of order. you can temporarily ignore such a problem. If no problems are found and the TV still does not turn on, the problem is different.
Wrong mode selected
If the TV does not turn on but the indicator is on, power problems can be eliminated. The problem may be in the wrong mode. Each modern LCD TV is equipped with many modes:
- Game console.
And many others. Read the instructions, and carefully study each mode. It is possible that your TV is in standby (sleep) mode. It is quite easy to determine this. the screen in this state goes out, and the indicator lights up in red or green.
Then check out the rest of the modes. Some LCD models have a special button that allows you to determine the current status. If you select the DVD player or game console mode, you will see only an extinct screen and a luminous indicator. Check the slots 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 blank.
Video: How to Turn on the TV if it does not turn on
The source of trouble can also be hiding in the breakdown of the remote control (DU). Press the power button. if the indicator blinks, then there is no doubt that the remote control is in good condition. If the indicator does not blink and does not respond at all, it is worth checking your remote control. Perhaps just replacing the remote control batteries is enough. If there is an identical remote control nearby, you can check it too. If the TV still does not turn on using the remote control, try turning it on with the button on the dashboard.
The radiation of the LED installed in the remote control is outside the visible part of the spectrum, so the human eye does not see it. Nevertheless, today anyone who uses a smartphone or mobile phone with a built-in camera will be able to check the operability of the remote control. To make sure that the remote control is working, you need to look through the lens eye at the photocell window and press any button on the remote control. the LED will begin to flash.
Sometimes, during a breakdown, the speaker emits characteristic sound signals. squeaks, clicks, etc. If the speaker beeps when you press the button on the remote control, it means that the remote control is working, and the problem is different. Sometimes there may be a modern LCD TV that beeps when the mode is selected incorrectly and there is no connection with the player or set-top box.
If the image does not turn on even with a button on the dashboard, most likely the problems are inside the device. Modern LCD devices have very sophisticated technologies, and trying to fix them on your own is undesirable. Listen. if something clicks in the back of the case, it could be a built-in blocking module. Very often it is he who causes all the problems. This module always clicks when activated, and if you hear a similar click, you will have to call a specialist.
In cases with old picture tubes, the "root of evil" usually lurked in a fuse, and with certain skills it could be replaced on its own. But modern LCD products were 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. This is a rather expensive example of household appliances, and it’s not worth the risk of such big money.
Recommendations for those who can handle a soldering iron
Among the reasons why the TV stops turning on, employees of specialized service centers call the breakdown of almost all the main blocks. pulse PSUs, photodetector modules, motherboards (Main Board or SSB) boards and backlight control inverters. They also note that the lion’s share of faults of this kind are accounted for by faults in the power supplies. For this reason, the first thing to do after the initial diagnosis (checking the voltage at the outlet, “ringing” the cord and replacing the mains fuse) is to examine the TV PSU according to the following scheme:
- Carry out a visual inspection for microcracks, chips and cold soldering, and then correct the discovered deficiencies.
- Replace swollen capacitors identified during external inspection.
- If, as a result of the examination, burnt or damaged resistors are found, it is necessary to carefully check the circuits in which they are installed. In the event that voltage dividers were built on these elements, the health of the transistors, diodes, and other semiconductor devices located next to them should be checked.
Most likely, the correction of the failures revealed during the initial inspection will be enough for the TV to work again. If the miracle did not happen, then further diagnostics are carried out from the inspection of the fuse. Its repeated burnout may indicate a breakdown of power transistors or rectifier bridge diodes. In addition, the semiconductors on which the PWM controller chip is strapped should be carefully checked. The chip itself is checked by replacing it with a new or obviously working part.
It is not difficult to detect the power supply unit of the TV. it is issued by the presence of winding units (transformers, chokes) and capacitors of increased capacity
Modern liquid crystal and plasma TVs, in addition to the main power supply, also have an additional standby UPS. This module is constantly energized, since it is used to feed 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 support the processor’s operability in sleep mode. Often, after many years of operation, the capacitors of the network module dry up, lose their capacity, "go into the open", and even begin to work in diode mode. Of course, after the storage elements fail, the process of voltage conversion becomes problematic, and starting the TV becomes impossible. Before proceeding with the search for replacement parts, it should be borne in mind that pulse PSUs have a high-frequency mode of operation. Since capacitors filter high-frequency pulses, parts with low series resistance (the so-called ESR) should be selected. In the process, they will heat up less, which means that after repair the TV will last much longer.