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(3)开机能点亮灯管,但瞬间熄灭此故障现象显然属于背光保护故障。前面我们介绍了背光保护有两种:一种是过压保护;另一种是过流保护。其实这两种保护功能启动时,所表现的现象是有区别的。如果是过压保护,则灯管点亮大约1s后,才熄灭;而如果是过流保护,则灯管点亮后,瞬间熄灭。判断是过压保护还是过流保护,还可以通过对地短路OZ960的②脚(OVP)的方法来实现。②脚的极限电压是2V,当该脚电压超过2V时保护,低于2V时正常。因此我们可以人为将该脚短路到地,强制其工作,如果这时灯管点亮后不熄灭,则说明是过压保护;如果还是熄灭,则说明是过流保护。
(3) turn on the lamp to light, but the moment goes out This failure is clearly a backlight protection failure. We introduced the backlight protection in front there are two: one is over-voltage protection; the other is over-current protection. In fact, when these two kinds of protection functions are started, the phenomenon is different. If it is over-voltage protection, the lamp turns on for about 1 second before it goes out. If it is over-current protection, the lamp turns off immediately after lighting up. Judgment is over-voltage protection or over-current protection, but also by short-circuit OZ960 ② feet (OVP) method to achieve. ② feet limit voltage is 2V, when the voltage exceeds 2V protection, less than 2V normal. Therefore, we can artificially short-circuit the pin to ground to force it to work. If the lamp does not turn off after lighting, the over-voltage protection is indicated. If it is still off, the over-current protection is indicated.