LCD screen black screen problem how to solve

The first is the power circuit is not good caused by: the performance of the panel buttons without any reaction, the indicator light is not bright, first check the 12V voltage is good or not, followed by check 5V voltage is good, because the A/D driver board signal processing part of the chip work The voltage is 5V, so when the fault can't be detected, first use a multimeter to measure 5V voltage. If there is no 5V or 5V becomes very low, then there may be a problem with the input stage of the power circuit. There was a problem with the 12V to 5V power supply.

This kind of fault is very common, usually burn insurance or voltage regulator chip failure, some of the machine is the built-in switching power supply, output two sets of power, one set is 5V for signal processing, the other set is 12V to provide high voltage For backlighting on the board, if there is a fault in the circuit of the switching power supply, it may result in no output of both sets of power supplies.

Another possibility is that the 5V load is getting heavier, and the 5V voltage is pulled very low. In other words, the signal processing circuit in the rear stage has a problem, some of the circuits are damaged, causing the load to increase, and the 5V voltage is pulled. Very low, one by one after the investigation of the problem of the components of the latter stage, after replacing the faulty components, 5V can be restored, the fault is generally resolved, and often encountered after 5V voltage recovery is not a good boot.

There are many reasons for this situation. On the one hand, the MCU program may be flushed, which may result in no boot, and the MCU itself is damaged. For example, the I/O port of the MCU is damaged and the MCU cannot scan the keys. Faults caused by the MCU, find the hardware problem is useless, even if you change the MCU can not solve the problem, because the MCU is the need to program and write the Ma, in the case of no way to find the original AD driver board replacement, We can only find another way to find the A/D driver board that can be replaced. There are many places on the market that can be purchased. If the local market can't buy it, you can post it on the LCD home forum. Many LCD masters may be able to purchase the accessories you need and find the information you need.

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