The monitor does not display power to show how to repair

　　Monitor power failure with no display

This is a very simple fault, the general LCD display extension inside the power supply and external power supply two, outside the common some. Regardless of that power, its structure is more simple than the CRT display power, easy to damage the general is a number of small components, such as insurance pipe, Rectifier bridge, 300V filter capacitor, power switch tube, power management IC, rectifier output diode, filter capacitors and so on.

　　The monitor is powered on without the display of a driver board failure

Drive plate burning insurance or voltage regulator chip failure, some of the machine is the switching power supply built-in, output two sets of power supply, including a group of 5V, for signal processing, and another group is 12V to provide high-voltage plate point backlight.

1, if the switch power supply part of the circuit failure will likely cause two groups of power supply are not output, first check the 12V voltage is normal, and then check 5V voltage is normal, because the A/D driver Board MCU chip operating voltage is 5V.

2, if the search is not open the machine failure, first use a multimeter to measure 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, then one may be the power supply circuit input level problems, that is, 12V to the 5V power supply part of the problem, this fault is very common, check 5-terminal voltage regulator block.

3, another may be 5V load increased, the 5V voltage pull very low, that is, the signal processing circuit after the problem, some of the circuit damage, resulting in heavier load. The 5V voltage pull very low, to troubleshoot the problem of the component, after the replacement of the defective components, 5V can return to normal, the fault is generally resolved.

4, encountered 5V voltage return to normal after the normal boot, this situation also has a variety of reasons, on the one hand is the MCU program is washed off may cause not to boot, there is the MCU itself damaged, such as the MCU I/O port damage, so that the MCU can not scan the button, encountered by the MCU caused by the fault, Look for hardware problem is no use, even if you changed the MCU can not solve the problem, because the MCU is required to program and write code, in the absence of the original AD driver board to replace the case, can only use a general-purpose A/D driver board substitution, such as: 151D or 161B.