1、 Can not switch on:iNOyesOnly 3.3VYN YCheck crystal frequenceCheck IIC busCheck the peripheral circuitof mail IC,check solder ofmain IC,check data fo NVMand reset itCheck resetsignal of mainno switch onCheck 3.3V/12V/24V of power supplyCheck PWCheck DC-DCpart,checkCheck signal P—ON,DIMBL—ON of main IC linkto PWTrouble shooting