机型：D49A630 机芯：T962A2
故障现象：不开机
维修与分析：检测各路供电均正常，接串口显示AddrBus test failed!!!
TXL:BL1:1ef924:56431c;FEAT:ADFD718C;POC:1;RCY:0;EMMC:0;READ:0;0.0;CHK:0;
TE: 64122
BL2 Built : 18:02:44, Feb 23 2017.
txl g3629254 – xiaobo.gu@droid05
set vcck to 1100 mv
set vddee to 1000 mv
set vddee enable AO_8 to high
set vddee enable AO_2 to high
DRAM reset…
init panel power
Board ID = 7
CPU clk: 1200MHz
DDR enable rdbi
DQS-corr enabled
DDR scramble enabled
DDR3 chl: Rank0+1 @ 792MHz – PASS Rank0: 1024MB-2T-11
Rank1: 512MB-2T-11
DataBus test pass!
ADDR-W[0x00000040]:0xaaaaaaaa,R:0xaaaaaa8a
ADDR-W[0x00002000]:0xaaaaaaaa,R:0xaaaaaa8a重复打印，怀疑主芯片或MEMC有虚焊现象，补焊故
障依旧，更换主芯片U1C后问题问题解决。