lcd laptop or monitor
TRANSCRIPT
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Monitor: LCD Panel common failures
and how to handle
01-05-2009 |lqv77 | 91 responses
1 - Display of color die
Expression:
On the screen with one or more of the color does not change the brightness in all
circumstances. Method of inspection:
- You set up the entire screen black to detect the color of death in the form of "do
not turn off"- Set the all-white screen to detect the color of "not bright"
Here's how:- Right click on desktop / select Properties / select Desktop- In the Background choose [None]
- In Color: black and then select OK
Then the screen will be black, you look carefully on the screen, if we see a red dot
or green or white, etc. ... it is the mystery of death "is not off"
Some die of mystery "does not turn off the" creation of green, red on black
background
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Some die of mystery "not bright" to create the green, red on white background
Cause of death:- The cause of this phenomenon is due to death of the driver transistors of the
color on the screen, making the point that color does not change when the
brightness control signal.
Fix:- You can not fix the dead spots on the screen, manufacturers often have
decreased from 10 to 20% of the cost to the customer when the Monitor detectsthe screen is between 2 and 3 dead.
2 - horizontal or vertical line screen color
Expression:
On the screen with one or more lines have not changed color portrait or landscape
screen
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Along the lines of death screen
Death phenomena lines across the screen
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Check:
Phenomenon displayed on the screen in all circumstances, so you do not need to
check you to see.
Cause:
The cause of this phenomenon is due to break in from the IC drive circuits control
horizontal and vertical lines of the screen to screen.
The cause of the vertical line does not change color due to vascular rupture in the
IC Drive or off the screen
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Causes of horizontal lines do not change color due to vascular rupture in the IC
Drive or off the screen
Fix:
- If fault circuit Panel LCD panels, you can not be joined- If the fault circuit immediately after the bus, the IC Drive is extremely complex
because of very fine circuit line
3 - Display lost part image
Expression: * Screen lost a vertical screen image
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Screen is lost along a screen image
Lost part of the screen image across the screen
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Cause:
Phenomenon is usually caused by damage control IC Drive along the road and
horizontal screen
Broken vertical line driver IC will lead to loss of a portion along the image
screen
Broken horizontal driver IC will lead to a loss of image across the screen
Fix:
* In this case, the only remedy is that you clean feet from the circuit Connect
LVDS interface with the controller IC Drive along the roads and crossroads of thescreen.
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* Replace broken lights or replacing the LCD
- When replacing the lamp, you need to replace the LVDS circuit is usually
accompanied by vessels under the lights.- You need to replace a tube on the model of the machine, you can hardly replace
the tube like CRT monitors because it also relates to the size and position signals
from the legs to Scaling circuits, we have approximately 12 to 24 feet Digitalcolor signal for the three color, four-pin control signals, power supply pin VDD
and a few feet Mass
4 - LCD screen broken plate
Expression:
A portion of the screen is bright white or color is not changed, the other stillimage.
A corner of the screen is broken
Cause:- Often caused by collision, or to transport or be spilled on the table from the
ground.
- One reason that caused by the worker because you remove the cover, use ascrewdriver can trust and breaking lamps.
Fix:
- The lamp is broken you can just change the lights or replace LCD panels
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Picture tubes and LCD panels, including the creation of background light
5 - Being a black spots or nodules on color image display area
Expression:
- On the screen has a black finish display
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The screen has a black finish
Cause:- Due to an object thrown into the tube being repaired or inadvertent, that you
forget to screw a light under the table and then fly them to break the overlap of
the colors on the screen.
Fix:- In this case you must change or replace broken LCD video light
6 - The screen is bright white, no image
Expression:
White screen no picture.
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Cause:- This is usually due to vascular damage LVDS circuit is attached to the tube
Fix:
- With this disease you can fix it after you find out LVDS circuitry associatedwith tube
7 - The following cases are often not the fault lamp.
1. Lost image, the screen just black and white stripes across the screen.
- This is usually not the fault of the tube that fault block image signal processing
- When H. Blank signal loss from circuit to circuit LVDS Scaling put it generates
the following hi
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2. Wrong color screen, photos with vitiligo.- When the image looks with blood thinners or similar disease vitiligo spreading
oil, it is often not the fault lights
- The cause of this phenomenon is usually caused by the loss of one or more sugarDigital color signal from circuit to circuit to LVDS Scaling
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3. The monitor has vertical stripes color screen- This is usually not the fault of the tube that fault block image signal processing
- When the Pixel Clock signal loss from circuit to circuit LVDS Scaling put it
generates the following hi
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4. Thui black screen, albeit on light.There are two cases led to this phenomenon
a) If the loss of background light (takes high pressure)
- When the black screen but when you get light shed on the screen you see a dim
picture of the inside lights.
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b) If the Video signal loss- In case of broken video signal processing circuit also causes burned black
screen, with this case from an angle you look at the show is still on screen.
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8 - Frequently Asked Questions
1. Question 1 - When buying an old LCD then check howAnswer:
When buying old LCD you should note the following:- Looking at the screen brightness is achieved with the request of you?, Normally
the screen has good brightness for more vibrant images.
- Setting up the highest level whether Contras were no speakers, some bad screen
when tuning up the Contras more light goes speakers were no longer visible andimage details.
- Getting a black screen on 100% and 100% white to observe whether the mystery
death?, Every point you die cost minus 10% if you accept buy it.- Viewed from an angle you see a clear picture does not?, Some screens are less
narrow perspective when you look at it sideways was clearly the wrong color or
shape.- You see the smallest detail on the screen is not sophisticated?, Such as
handwriting, they line the stronger the showing of the screen resolution is higher.
- Setting up the resolution on your computer to view the screen can display the
maximum resolution is, if the display has low resolution, when increasedresolution at higher computer resolution maxima of the screen it will take shape,
so the screen resolution as high as possible.
- Open a landscape view with vibrant color, if color is more vibrant colors toshow depth as high.
2. Question 2 - Monitor errors and fix what is not?Answer:
Monitors tend to have the following error that can not be overcome or are difficultto overcome:
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- Dead pixels display color (on screen with color spots have not changed in any
situation)
- Monitor stripes vertical or horizontal color screen- Monitor or deep black spots on screen
- Monitor the broken, damaged.
3. Question 3 - Screen lost in green, purple just off screen, probably because thelight is not broken?Reply:
- With a CRT, the phenomenon may be due to corrupt good Ka G, while the LCD
screen is not a phenomenon caused by light.- In light of the CRT, the color is light or not is dependent on the electron beams
emitted from Katot respectively, while on the LCD, the color spots are caused by
a common signal is the pulse of Pixel Clock control, if they lose this momentum
will take pictures, not just the wrong color- The phenomenon takes on a color LCD display usually a color signal loss from
the Video Card lead, can be caused by broken signal cable.
4. Question 4 - Please compare the two types of lamps and lamp LCD CRT
Answer:Same:
- Both screens were scanned using principles to create animations.- Both screens can display a multitude of colors, but in fact only three basic
colors: red - green and blue.
Different
- Light CRT electron beam to excite the phosphor material emitting light directlygenerated from phosphorus layer, there are three types of phosphorus and they are
capable of emitting red, green and blue ray when electronic stimulation.
- Back light LCD display, the voltage used to control liquid crystals allow light
through more or less, every part of the liquid crystal color filters to filter out red,green or blue.
- Light CRT deflection coil used to drive the electron beam scans horizontally and
vertically the screen, then roll back the driver electron beam scans from left toright scrolling screens also blinds the driver for driving electron beam scans the
screen from top to bottom.
- LCD back light using electrical impulses to move the control to the next pixel,
each pixel clock pulse as it appears to move to the next control point image on theright, each pulse H. Blank it appears that the next move down the line and each
pulse is V. Blank appears she returned to the starting point of scanning to a new
screen.
- Because the color is emitted directly from the phosphorus layer should generally
brighter than CRT monitors and more vibrant color LCD screen
- CRT uses magnetic fields to drive the electron beam and inevitable phenomenon
known as curved edges or distorted when your knee makes graphic design, thelines were curved, while the LCD screen Straight lines are always absolute.
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- On-screen CRT with the phenomenon of blurry photos when the weather is wet
Focus also wrong voltage on the LCD screen will never be the phenomenon.
- CRT when the light emission of good ka weakened causing blurry and thewrong color, then you must replace the lamp, while on the LCD screen, goes dark
when you can replace with high-pressure balloon cost is very small compared to
the light to change.
- Lamp voltage CRT HV up to 15.000V 20.000V also to light the LCD voltageHV to 1500V only from 1000 so it's safer for your workers.
- CRT light can emit ultraviolet rays are harmful to human health also use the
LCD screen is not.
- Light CRT has caused the phenomenon of infection from blood-thinning LCDscreen is also not affected by magnetic fields.
5. Question 5 - Determine the similarities and differences between tube andLCD TVs LCD MonitorAnswer:Same:- Both screens have the same operating principle
- Both screens have the same structure
- The evaluation criteria for the quality of two types of lights have somesimilarities
Different
- Lamps LCD Monitor Image resolution is often much higher than LCD TV
picture tube
- The Pixel Clock frequency, and V. Blank H. Lank of higher LCD Monitor LCDTV's
- Technology lamp manufacturing of sophisticated LCD Monitor LCD TV picturetube
- Max brightness of the screen LCD Monitor is often weaker than the LCD screen