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TPS61500出现不工作

Other Parts Discussed in Thread: TPS61500

发现有台机器放的时间久  背光有时会闪   用示波器量发现给TPS61500输入电压稳定,PWM也稳定,但是开关脚有时没打开,屏不亮时没波形,不稳定,有时一天才发现一次,PWM的频率是200HZ,占空比80%,OVP的电压为23V,背光电压是20.4V,屏是6个灯串一起,请帮忙分析