Fault diagnosis techniques for display "black screen"

1. Monitor "black screen" and power LED is not lit

This type of failure is more than the display itself fault. First should check the monitor power cord is connected, power Plug and 220V AC socket is good contact, monitor power switch is open. After confirming that the 220V AC power is properly sent to the monitor, the monitor fault can be determined.

2. Monitor "black screen" and power indicator light

This kind of fault phenomenon localization is more complex, the breakdown may occur in the display, the display card, the motherboard or the signal cable and so on part. Check the first adjustment of brightness, contrast knob, to observe the screen has no light and shade changes, excluding the brightness, contrast shut dead and "black screen" phenomenon. If the adjustment of brightness, contrast knob screen is still "black screen", you should check the host to the monitor signal cable is plugged in good, there is no broken, disconnection fault; After confirming that the signal cable is intact, post (power

On self test for power on self test.

Post detection is the process by which a computer automatically starts the Post diagnostics to detect the normal or not of a computer's system components each time the power switch is turned on. The discovery of a problem in the detection provides an operator with an error message or a series of beeps. In the Monitor "black screen" this fault, post detection screen information we do not see, but can be a series of beeps to determine the location of the fault.

3. One long, two or three short beeps

This signal (may be repeated) indicates that there is a problem with the card, should shut down the host power, open the chassis, check the display card and expansion slot is good contact. If you suspect expansion slot problem, you can use the plug to replace the display card in the expansion slot to exclude. If the fault is still not ruled out, you can change the display card to other matching computer on the inspection, if the other computer card after the "black screen", then judge the fault on the display card; If the display card works on other microcomputers, the fault is on the motherboard.

4. Two Short bee Sound

This failure may be on the motherboard and the display card or the monitor itself (very unlikely). Turn off the power, disconnect the monitor, remove the display card, and reboot the system. If two short tones still exist, the problem is on the motherboard, the motherboard should be repaired. But if the sound becomes a long, short, then perhaps the correct post process notes that the display card does not exist, should turn off the power source, reinstall the display card, but do not connect the monitor. Reboot the system, if the two short beep signal in the post still exists, then for the display card failure: But if you hear only a short sound, the display card is good, is the display itself caused by this error signal, should overhaul the display. When the monitor is disconnected from the host and the host is tested, make sure that the post process has power, during which you can observe the operation of drive A and determine its system function. The A drive indicator lights up after the post process completes. When the drive is stopped, the key person dir

A: command, the drive should be rotated again, the LED is again lit, which indicates that the system functions properly, the host system board intact.

Through the above detection can determine the display "black screen" fault location.