The fact that lcd tv is already an essential electrical device for our families is also an indication of our standard of living and the demands for quality of life, but it also brings us much joy. Of course, when we're happy, we'll have some problems, and television failures are normal, but do you know what to do? Let's not get confused, let's start with some simple home electrical maintenance, starting with the usual lcd failure。
Frequent failure of lcd tv:
1. Powerlessness of monitors as a whole
(1) power: this is a very brief issue, which is more common in the general lcd extension, both in-house and off-site. Regardless of that type of power supply, its structure is much more simple than that of the crt monitor, and it is generally vulnerable to small components, such as a secure tube, a current bridge. 300v filtering, a power switch, a power handling ic, a current output diode, filtering。
These commonly used pmw chips are commonly available in specialized lcd stores like mine。
(2) drive plate problems: some of the machines are internalizing the switch and exporting two sets of power sources, one of which is 5v for signal processing, and the other for 12v supply high voltage plate backlights, which could lead to the non-output of both sets of power sources if there is a problem with the switch's part circuit. First, check the normality of the 12v voltage, then check the normality of the 5v voltage, and then find out whether the failure to open the machine is due to the fact that the operational voltage of the mcu chip of the ad drive is 5v, so that the 5v voltage voltage pressure is used in 10,000, if no 5v voltage or 5v voltage is low, then one of the power circuit input levels may be problematic, i. E., there is a problem with the 12v conversion to 5v's source segment, which is very common, looking at the 5-side pressure blocks (common type, etc.). Another possibility is that the 5v load has increased, the 5v voltage has been pulled down very low, in other words, that there has been a problem with a later signal handling circuit, that there has been some damage to the circuit, that there has been an increase in the load, that the 5v voltage has been pulled low, that the problem of searching for hardware has been removed, that the problem is normal, that the problem is dealt with generally, and that the problem is not normal after the 5v voltage has been properly recovered, and that there are many reasons for the fact that the mmu process could not be opened, and that the cmu itself has been damaged, for example, by the cmu io mouth damage, which makes it impossible to scan the keys, that the problem caused by the mcu is useless, that even if the mcu is unable to deal with the problem, because the mcu is a processorizing and writing code, and that, in the absence of finding an ad-driven replacement at the plant, we have to replace it with a generic adr panel, like 151d or 161b。
2. Display black screens, no backlights, power lights are often green:
The opv screen has display images, mostly of high-voltage plate power circuits. The focus is on the normality of the 12v power supply (fiscal f) and the 3v or 5v switch voltage. If an output switch is not used to control the voltage because of the mmu problem, the three-end steady pressure block can be removed directly. The idea of repairing high-voltage panels (power fuses - switch controls - power management ic - boosting large tubes - power switches - da conversion circuits (energy senses, current tubes) - lc voltage circuits (voltage transformers, voltage caps) - lc boosters - ccd cap--- light tubes。
3. Display screens are not lighted, but power lights are often green。
This problem is generally caused by high-pressure abnormalities and is protected by circuit movements, in which case the general liquid crystal screen is shown and the method of viewing is oscillating。
4. Questions such as flashlights, flash belts or dark lines are typically problems with liquid crystal screens。
Light-line failure is usually a problem with the line line connecting to the liquid crystal screen core or with the ic damage driven by a line or column. Dark-line lines are typically a leak in the screen's matrix, or the tab flexible plate is connected to the circuit. Both of these problems are basically death sentences for machines, with no maintenance value, because a screen is too expensive。
5. The problem with the screen or white screen (the black screen phenomenon, the reason for the black screen, the reason for the opening of the black screen, the problem resolution [in detail]]) is generally a problem with the engine voltage of the screen, replacing the driveboard and the anti-screen screen test, or, failing that, checking the electric circuits on the backboard, repairing the thinking: whether there is an electrical output -- f (f)-3. 3v) -- of the steady plate of the drive 5v, which turns on 3. 3v -- the dc-dc converter circuit -- which is a negative-pressure line formation, the column-screen power management chip, which is damaged in the light of the white-screen image, etc., and which is mainly used on the fp71g+ liquid crystal display. The white screen is used for some time, and it is turned off for some time. This chip is the lcd high-pressure generation and management chip, lcd display frequency, failure: white screen, etc., lcd main chip with a high rate of damage to ic and failure: the lcd main chip with a high rate of damage to the flower screen, white screen, no display of connection signal lines, and the ic main chip with a high rate of damage to the ic: general, macro-base, benq, etc., lcd main chip with a high rate of damage to ic and failure: flower screen, white screen, no display of connection signal lines, etc. Se788
6. There are stain repair lines inside the lcd screen: wipe or replace the protective film - remove the screen to clean the outer luminescence and organic glass (with a cotton ball, treated with pure water) - wind drum dry。
7. Colouric failure generally allows for plant adjustments. In the absence of this form, repair thought: replacement screen and switchboard - - rewrite driver - - drive plate bad (unusual) - control ic bad (unusual) - remove screen survey backlight colours (backlight is old) - change light tubes。
8 the lcd screen leaks or the light is not evenly repaired: re-installation of the light tube - the adjustment steering panel。
9 charades or drag-back repair ideas: look at the vga signal line and point to whether the line in the r. G. B. Tricolor line is connected to the normal - - replace screen line or switchboard - - rewrite driver - - switchboard - lcd screen backboard signal interface ic bad - - lcd screen backboard contraster calibration - - lcd screen steering panel error - misdirector。
10, error hint over the frequency scale to view the signal lines - rewrite the mmu driver - replace eprom - rewrite the eprom program - rewrite the drive panel。
11, lcd screens have low brightness to look at high pressure plate adj brightly adjust circuits -- change light tubes -- change high pressure panel -- adjust or replace light panels。
12, lcd screens highlight one or two large bright spots, capable of testing the tip of the finger, and can disappear, clarifying that multiple pixel switches and electronodes for this purpose ... Small black and grey dots may be internal guided panels or migraines formed by dust that can be cleaned and processed。
The switch signal that normally displays the high pressure plate interface and the adj signal backs up when the button is activated without pressping the switch key, i. E. The backlight of the white screen. The switch output, which is partly attributable to the drive plate mmu, is abnormal and is capable of rewriting the mmu program for repair - in exchange for mmu。
In conclusion, the frequent failures of the lcd televisions described by the young editor should have been encountered, and now we know how to deal with them, so don't worry about it the next time. Of course, if you want to repair them, you have to figure out how the tvs are built, so it's easier to fix them, and finally, to keep the electricity safe in the maintenance。
