接修一臺(tái)海信H55E3A液晶電視（RSAG7.820.9250主板，MSD6A648機(jī)芯），故障表現(xiàn)為開機(jī)5分鐘后死機(jī)，拆機(jī)測(cè)量DC-DC LDO是否異常，無異常，U盤升級(jí)主程序未能排除故障，用串口工具觀察打印信息分析；打印信息如下：
MIU0_DQS-OK
BIST0-OK
BIST1-OK
#_m
armfwNOTICE: BL3-1: v1.1(debug):e9dbd72
NOTICE: BL3-1: Built : 14:07:05, Mar 18 2017
XU?andled Exception in EL3.
x30 = 0x000000003de2a004
x0 = 0x0000000033000097
x1 = 0x000000001f201300
x2 = 0x00000000000000c5
x3 = 0x0000000000000002
x4 = 0x0000000000000000
x5 = 0x000000003de34548
x6 = 0x0000000000000000
x7 = 0x00000000a0000000
x8 = 0x000000000000ffff

上述打印信息為EMMC損壞，元件型號(hào)H26M41204HPR，位號(hào)N56，更換重新寫入數(shù)據(jù)后故障修復(fù)。