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请教 3438+PAD3000 3000的10V 18V -14V没有输出

Other Parts Discussed in Thread: DLPA3000

板子在开始时能正常工作,一段时间后突然点不亮光机,经测量发现DLP3000的10V,18V,-14V都没有输出,.而且这样的情况不是一直没输出,偶尔有时候能输出,光机能点亮,但是有时候又只能亮一下就灭了.请问这种情况是什么问题?电路layout还是其他什么问题?