机芯方案：HI3751V5510
故障现象：不开机
故障原因分析：卡在开机界面，先软件后硬件的原则进行维修
检修过程：因无任何打印信息，主板各路供电未发现异常，所以更换HI3751V551，H26M64208EMR后升级主程序会卡到53％（百分之多少不一定）后就出现如下打印信息
reading targethis/His3751v551Upgrade.bin from address 1073742628
53%
reading targethis/His3751v551Upgrade.bin from address 1207960356
59%
LOADER_BURN_Verify_chunk[158]ERROR: LOADER_BURN_WriteData[277]ERROR: LOADER_PROTOCOL_HisiFILE_Process[824]ERROR: LOADER_RecvBurnUpgrdData[355]ERROR: LOADER_DoUpgrdProcedure[428]ERROR: ** Bad partition specification mmc 0:atv **
故障原因：U盘坏了导致升级主程序失败
故障板号：RSAG7.820.8408
故障元件：HI3751V5510 H26M41204EMR