The television is now highly integrated, with only one or two circuit boards and a liquid crystal panel, plus the shell is a television. The high-level integration of television sets is to make maintenance unnecessary, non-maintenance, broken and new, so most of the real maintenance is now re-painted, and the maintenance of chips is slowly not being done because of the high cost of time and the difficulty of matching spare parts。
So when the tv in the house is broken, you can fix it the way it is, or make sure it really needs to be replaced
1. Fragmentation of liquid crystal screens
The lcd screen is a high-tech implantation of lcd particles and the control of circuits in the middle of two super thin glasses, allowing for the conversion of lcd particles through different voltage control and scanning techniques, resulting in brightness adjustments and a combination of colours, leading to a high-resolution image. Because of the fragility of the glass, lcd television is easily broken if used inappropriately, and once the lcd screen is broken, it cannot be repaired and can only be replaced. Since the main cost of lcd tv (almost 70 per cent) is now on the lcd panel, the cost of changing the screen is high and uneconomical and can only be thrown away。
Note: the lcd panel is very weak, it can stand up and rely on the back of the metal shell, so the lcd panel cannot be hit with any object, can't beat with a fly, can't hit with a stick。
The newly purchased lcd television must be properly communicated to the merchant before it is purchased, and after receiving the goods, it is either a direct defibrillator or a deformation check in the packaging, followed by a door check by the installor. In the case of installation personnel, we only have to check the boxes when the goods are received, and must not install the machines. Once the machine found that the liquid crystal screen was broken, it was impossible to separate responsibility and had to bear the consequences on its own。
2. No sign of light
Fault performance: the panel light is not on (usually red, blue or red when turned on) and the television is silent after pressing the power switch on the television。
Causes of failure: lack of electricity for municipal plugs, damage to power plugs, damage to ship-shaped switches, and burning of electrical panels inside televisions。
As a rule, the tv power panel is running normally, the main panel is working normally, and when the tv self-inspection is completed, the panel light is red, indicating that the tv is on standby and awaiting a remote control signal。
If there is no red light on the tv when you press the boat switch, then we have to make a further determination as to whether the power panel inside the tv is damaged. This “ship switch” power switch on the television is usually on the lower or back of the television, and only when the television is pressed。
Auxiliary judgement methods:
Because televisions are usually 100w-300w, we can insert power plugs into plugs when they're on. We can see if there's a spark in the plugs, and we can hear a crack. If this is the case, it means that television panels are normal, lights are not on, mostly on the main panel, or on the keyboard。
3. Lights on
Fault:
] when the power is pressed on the power switch, the television panel light is activated, but the remote control is unable to turn it on, or the panel button is not available。
Causes of failure:
This failure may have been the result of the breakdown of the remote control, the absence of electricity, the failure of the television panel switch and the breakdown of the television main panel。
Under normal circumstances, the television signal light is on, indicating that the power supply is normal. At this point in time, press the switch button for the remote control or press the stand-by button for the television panel, which should be opened normally。
First, we have to make sure the remote isn't good. We can turn on the phone's camera, turn the remote's infrared head on the camera, press the remote's button, and observe the mobile screen. If we see a flash of light coming out of the remote's infrared emitter, it's good。
If the remote control does not have a red light flash, it means that the remote control is broken or that the remote control battery is out of power and the battery needs to be replaced。
Then we can press the "stand-by" or "standard" below or behind the tv panel. Press the button to see whether the television sets indicate a color change or an image of the screen. If you can turn it on, you can again determine that the remote control is in question. If you can't turn it on, you'll have to open the tv。
3) we need to put the tv back on a flat desktop and put it down. We need to find the keyboards and infrared headers for the tvs after they are removed. If the remote infrared header of the television is integrated with the keyboard, it is more problematic. If it's separated, we can pull the keyboard plug and use the remote. If turned on at this time, it means that the button leaked or the keyboard damaged the circuit, resulting in the failure to turn it on。
4) even if we can't judge whether the key is good or bad, we can assume that the main plate is bad, and that we come back from the internet and order a master plate. If replaced, it is not a matter of the main board, the main board can be returned at a certain cost and the seller will not refuse。
Knowledge point: the tv panel light is not a simple power signal, but rather a working-status indicator. Many of the leds are of a dual colour and are controlled by the cpus on the main panel, which typically indicate different working states in colours or flashes, constant lights and extinguishes。
The light will only be activated once the main panel has been self-inspected and is not electrically activated. When an infrared remote control signal is received by the television, the light usually blinks, indicating that it is receiving an infrared signal。
Television panels typically output one +5vsb and +5v and +24v. When the red light is on (i. E. When the remote control is not on), the power panel only output +5vsb. +5v and +24v power supply will only be exported when it is turned on。
Reminds us that if the television is not used in practice, it must be completely out of power and should not remain on hold for long periods of time, so that the television will have a longer life。
Four, it's working. No sound
This problem is more common, mostly in the use of lcd televisions for more than four or five years, mostly in backlights, leading to high-pressure plate protection; the few have problems with high-voltage plates or with power-based panels。
Such problems often manifest themselves in the image of the screen when it is on, which is dark in a few minutes; in the case of a few flashes on the screen and then black screens; or in the case of half of the screen when it is on, which may be dark on and off, etc. It's also possible that it's just open, using the black screen in a few hours。
1. Backlight failure
In the maintenance of lcd television, the most problematic is the backlight. Backlights on lcd television are common in back-in (heavy shell) and side-in-side (weather panel), and, in any case, back-inlight lamps are heat-disseminations of metal casings that rely on aluminum and lcd panels。
To the extent possible, backlights are replaced by original lamps, either original or imitated, and only the original lamps are fitted to match the old ones and are capable of meeting the greatest dissipation conditions. If modified lamps were to be used, the dissipation problem would not have been resolved, even if they had been repaired, and the led lamps would have been damaged again due to overheating in a few months。
The price of 55 inches of liquid crystal strips is also less than $450. It's usually $3,400 to pay for maintenance, which is difficult to change. It's a good tv, or a useless tv。
The key to the change of lcds is to be careful。
For side-input lamps, most of them are glued to the panel metal shell using double-sided gels, so we must replace them as they are, so that the light does not correspond to the lightboard position。
High pressure (heat flow) panel failure
It's more difficult to judge a high-pressure plate failure unless you have a led tester in your hand to test the good or bad of the led lamp. For our own home maintenance, we can see if there is a filter-capable drum pack on the high-voltage and power panels, and if there is a drum pack, then change the drum-capacitation。
Only three plates can be removed from the inside of a brand-made television shell: a high-pressure one, a main board and a logical board. A small number of televisions may have only two plates, electric high-voltage master plate and logical board。
It is not possible to determine whether back-light protection resulting from the damage to the high-pressure plate can be determined by purchasing a power-based high-pressure one board instead of excluding it. The price of a single electric pressurized plate is typically less than $100 and is not expensive。
Five, turn on
The tv switch is normal, it's an abnormal image, and the main thing that we're looking at is the ffc screen interface。
1, screen and logical panel interface
2. Logical panels and screen interfaces
3, screen and main panel interface
If the television is used in an environment that is too damp, ffc screens may lead to poor exposure, use of screen images to show sides, snowflakes, etc. In case of poor exposure to screen oxidation, all links to the signal are checked and not only one。
5. Special malfunctions
1 - do not turn it on after adding power
This problem is more problematic with the power output voltage is unstable when the engine is cold. After a period of power, the chip is heated and the output voltage is stabilized, and the television sets will be able to switch off。
Solutions: replacement of power panels。
2. Switching is normal
Most of these problems occur when the main panel of the television is dissipated or when the heat tablets are designed to be small, and the prolonged use of the post-main chip bga welds results in abnormal shutdowns at work。
Solutions: change the master board。
It's normal when it's on
The problem logic panel is more problematic, possibly due to a leak in the lcd circuit or a leak in the cof chip。
Solutions: replace the logical board。
Four, it's normal to just start with a black screen in over an hour, but sound is normal
The problem was also the ageing of the led lamp, which, after some time on the television, was overheated, resulting in an excessive leakage of electricity, causing high pressure plate protection and black screens。
Solutions: change backlights。
Five, the tv's on, but when it's on, it's dead
This is a problem with the tv program, which can first buy a matching model from the internet and try using a flashing machine. If post-brush failure is the same, then the flash chip is broken and needs to be replaced. You can also send the broken tv master board to the repair shop and then send it to you。
Solutions: brushing or replacing the main panel
