LCD Display No Signal Black Screen Solution

- Feb 11, 2018 -

Due to the display itself can not work due to the black screen, such as the monitor power cord is defective, poor contact with the power plug (Note: both are possible), the power switch is bad, the display internal circuit failure.

A signal line

The 15-pin D-type plug used in the display of the PC is connected. The 13th and 14th pins of the PC are the field sync signals. The display determines whether to turn on the filament and the high-voltage power supply channel by judging the presence or absence of these two signals, At the same time these two signals through the positive and negative signal combination of the polarity and the different frequency, as the display mode of the transmission signal. If there is a lack of signal at both ends of the line, LCD display the monitor's power light is green but no image is displayed; if it is missing, the monitor's power light is orange and no image is displayed. In this case, check whether the D-shaped plug of the monitor signal cable has a broken pin, a crooked pin or a short pin, and the other is that there is a break in the signal wire. The solution is to replace the high-quality signal line.

We have a computer in the CMOS settings in the power management there is a "Video off Method" one of the "V / H SYNC + BLANK, Blank Screen, DPMS" three options, one of the first is to select the video output line signal To control the monitor's power saving mode.

Second, the monitor

Due to the display itself can not work due to the black screen, such as the monitor power cord is defective, poor contact with the power plug (Note: both are possible), LCD display the power switch is bad, the display internal circuit failure.

Three. Graphics

The most direct link with the monitor is the video card, if the video card no signal sent or signal can not be sent out, then of course the monitor will not light up. In actual use, the graphics card is not compatible with the motherboard, the video signal output socket contact is not good or loose, then the graphics card is damaged, the graphics card and the motherboard AGP slot contact is not good, these will cause the monitor does not light. The exclusion of such failures require careful patience, carefully check the graphics card and the motherboard of the contact situation, the existence of contact instability. For incompatible situations, LCD display only based on experience and information to judge.

Four. Power

When we are equipped with the machine always in CPU, memory, spend a lot of money, but always on the power do not mind. But the power supply as a power source for all the components of the computer, if it is a problem, other components can work? We all know, if the power failure, the host will have a continuous short "beep" sound alarm, and the monitor not bright. However, there are also silent, the last Chacha search, turned out to be the power of the problem.

Five. Motherboard

Mainly CMOS settings error, set the first initialized video card for PCI or onboard AGP graphics card, but the monitor is not connected to the appropriate location, LCD display the results of the normal computer startup, but the monitor is not bright. Moreover, that is, CPU, memory or video card, sound card, modem, network card conflict problems, can also cause the host does not start causing the display black screen failure.


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