Lcd maintenance idea 400-9028-922
1. Powerlessness of the monitor as a whole
(1) power failure: this is a very simple failure, which is more common outside of the machine, with the normal lcd extension, both inside and outside. Regardless of the type of power source, its structure is much simpler than that of the crt monitor, and it is generally vulnerable to small components, such as a safety tube, a current bridge. 300v filtering, a power switch, a power management ic, a current output diode, filtering. C:6841203d06 is commonly used for power panels, and these commonly used pmw chips are available at a lcd store like mine。
(2) driver failure: the failure of the drive plate fire insurance or of the steady pressure chip, some of which is the internalization of the switch and the output of two sets of power, one of which is 5v for signal processing and the other 12v for high pressure plate point back light, may result in the failure of both sets of power sources. If the 12v voltage is normal or not, then the 5v voltage is normal, since the working voltage of the cmu chip on the a/d drive is 5v, so when the failure of the engine is not detected, the 5v voltage is measured on a single scale, and if no 5v voltage or 5v voltage becomes low, then one may be a problem with the electrical feeder level, i. E., the power component of the 12v conversion to 5v has a problem, which is common, with a check of the five-end stable pressure (common model 8050sd-lm2596-aic15-01, etc.)。
One possibility is that the load of the 5v has increased, the 5v 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 there has been a low pull of the 5v voltage, that there has been a breakdown of the 5v, that there has been a recovery of the 5v, that the failure has generally been resolved, and that there have been many reasons, on the one hand, that the mmu process has been washed away, and that the mmu itself has been damaged, for example, that the i/o mouth of the mmu has been damaged, that the mmu has been unable to scan the button, that the problem of finding hardware has not been solved by such a mcu-induced failure, and that even if you have changed the mcu, because the mmu is required to prepare and write a code, and that, in the absence of finding an ad-driven replacement for the original plant, we have to replace it with general a/d-d: 151d or 161b。
2. The screens will not be lighted, but the power lights will always be green。
This problem is generally caused by high-pressure abnormalities and by the protection of circuits, in which case the normal liquid crystal screen is shown and the method of viewing is “slash”。
3. Display black screens without backlight. Power lights are often green。
The opv screen has display images, mostly of high-voltage panel power circuits. Special attention is paid to the normality of the 12v power supply (fibre f) and 3v or 5v switches. If there is no output switch to control the voltage due to the mmu problem, the 3-end steady pressure block (aic1084) 3. 3v can be replaced by a direct extraction. 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 transformers) - lc voltage circuits - coupling of caps - lamps。
4. Screen light, flash belt or dark line
The problem is usually the failure of the liquid crystal screen. Light-line failure is usually an error in the line line connecting the liquid crystal screen body or a damage to the ic drive of a line and column. The dark line is typically a screen in which there is a leak or a tab flexible plate to open the circuit. Both of these problems are essentially death sentences for machines, which are of no maintenance value because a screen is too expensive。
5. A screen or white screen
This problem is usually caused by problems with the screen's drive voltage, with the first re-engineer and the screen-wire test, failing to check the backboard power circuit, and the idea of repairing: if there is an aic1084 power output in the stable pressure block of drive plate 5v to 3. 3v. - --screen plate fuse (f)-3. 3v - dc-dc conversion circuit - negative pressure forms ic (-7v) rows, column driven by ic. Aat1101 am150xn05 screen power management chip, when damaged as white screen `open image dim, etc., aat1164m170eg01 new screen-pregnant disease, mainly on the light-based fp71g+ lcd monitor. The white screen is used for some time, and it is turned off for some time. This chip is a liquid crystal screen high pressure generating and managing chip, and is often broken by a crystal crystal display, with a failure: white screen。
6. Colour bias
The plant adjustment model is generally accessible. In the absence of this model, the idea of maintenance is: replacement of screens and switchboards - - rewrite the driver - - bad drive (unusual) - control of ic bad (unusual) - removal of screens to observe backlight colours (backlights are old) - - change lamps。
7. Character fiction or tail drag
Maintenance thought: checking vga signal lines, focusing on whether the lines of the r. G. B. Tricolor line are connected properly - - replace screen lines or switchboard - - rewrite drive - - rewriting drive - - switchboard - lcd screen backboard signal interface ic bad - - lcd screen backboard contrasting epoch adjustment - - lcd screen steering panel misdirection - specular error
There are stains inside the lcd screen
Maintenance thought: wipe or replace protective film replacement - - dismantling screen to clean outer optic and organic glass (treated with cotton ball, pure water) - wind cylinder drying
9. Lcd screen leakage or uneven light
Maintenance thinking: re-installation of lamps - adjustment of light board
10:10 lcd screen highlight
One or two large bright spots can be tried with light finger tips and can disappear, indicating multiple pixel switches and electrode failure. Small black and grey dots may be caused by internal light panels or by dust in migraines. Could be cleaned。
11: low lcd screen brightness
Check for high voltage plate adj brightness wiring tubes - replace press panels - adjust or replace light board
12: error hint "out of frequency"
Check signal lines - rewrite mcu driver - + replace eprom - rewrite eprom program - + change drive
13: backlight on the white screen without pressing the switch when power is activated. Images can be displayed normally when the button is pressed
The switch signal for the high pressure plate interface and the adj signal were inverted and the switch output, which was partly attributable to the drive plate, was abnormal and could be rewritten to fix the mmu program. ---- for mmu
14: add one more point
The size of the lamps is to be clarified for the replacement of the old screens of the lamps, since, although the size of the screen is the same, the length of the tubes varies slightly from the size of the tubes, and if short lamps are not available for the same size, the longer tubes are carefully removed with a surgical knife and insulated with the thermode. Gyeong lo's 24-hour service line
