通电不开机,测试供电均正常,查看打印信息,打印信息反复显示: TXHD:BL1:6c4d9f:45932a;FEAT:E0FD718C:2000;POC:F;RCY:0;EMMC:0;READ:0;0.0;CHK:0 TE: 94801 BL2 Built : 17:33:44, Jul 19 2018. txhd gcb34dbb – hui.an@droid09-sz set vcck to 1050 mv enter pwm_set_voltage set vddee to 1050 mv enter pwm_set_voltage set vddee enable AO 2/10 to high set test_n to high Board ID = 1 CPU clk: 1200MHz DQS-corr enabled DDR scramble enabled DDR3 chl: Rank01 16bit @ 936MHz, 此打印信息之前遇到过是主芯片不良,果断代换后故障依旧,怀疑是CPU到DDR有过孔不良,逐一检查均为正常,测试DDR的基准供电也是正常,最后怀疑是DDR不良,代换UDD2不行,再代换UDD1后打印信息恢复正常,此时机器已经可以正常开机,反复试机均未发现其他问题.