近期修到43/55E6200-8S70机器主板多数都是待机不开机（开机指示灯由绿灯立马变为红色），按按键和遥控均不开机，打印信息直观法显示“待机”，打印信息如下：
检修流程：1.常规法测量主板各供电系统均正常，初步判断是主板软件引起。2.维修方向首先先升级试下，经过升级完主板开机了，正常反复交流开关机主板均能正常开机或遥控开机。升级方法：
方式一：强制升级
强制升级可进行主程序和Mboot升级。将升级文件或引导文件（*.bin）放U盘，插到整机USB2.0端口，按着整机键控板“确定”键，交流开机，整机自动进入升级状态。
方式二:串口强制升级
将串口和电视连接好，然后电视交流开机并迅速敲击“回车”键，直至secureCRT界面出现“Mstar#”字样，图示如下：
将升级用的文件“Mstar Upgrade_EMMC.bin”拷贝到U盘的根目录下，插在侧面任意USB端口上，并拔掉其他USB端口上的USB设备，然后在工厂模式下的其他设置打开UART串口，进入UBoot命令行状态，顺序输入三个命令如下：
set upgrade_mode usb
save
reset
故障打印信息如下：
UART_115200
AC_ON
MIU0_DQS-OK
MIU1_DQS-OK
BIST0-OK
BIST1-OK
_U
Relocation Offset is: 01200000
[AT][MB][start ub][292]
U-Boot 2011.06 (May 08 2015 – 17:04:46)
[MIU INFO] miu opencreate instance at 345aa300 with private size 80 bytes at 345aa348
create instance at 345aa3a0 with private size 48 bytes at 345aa3e8
uboot held at [342ddf60~36200000],size=01f220a0
===MBoot_Binary_Release===
CPU : Muji
Board: BD_MST072B_20AEV_MUJI_CUS36
DRAM: 354 MiB
Now running in RAM – U-Boot at: 35300000
FCIE_MODE_GPIO_PAD_DEFO_SPEED
FCIE_MODE_8BITS_MACRO_HIGH_SPEED
FCIE_MODE_32BITS_MACRO_HS400_DS
eMMC: HS400 200MHz
eMMC 3.68 GB [75FFF8h]
In: serial
Out: serial
Err: serial
Net: No ethernet found.
Get MAC from ethaddr env
MAC: 0x1c: 0xa7: 0x70: 0x78:0xa5: 0x1a
#######################################################################
#######################################################################
[CPU INFO] cpu opencreate instance at 345ba8a8 with private size 44 bytes at 345ba8f0
CPUIoctl – MDrv_CMD_CPU_QueryClock
[UTOPIA INFO] close moduleNames[38]: MODULE_CPU
msIR_Initialize
[AT][MBoot][Driver Init][434]
=wakeup=value==:0
Writing to MMC(0)… 128 blocks written: OK
128 blocks written: OK
done
–u8adc0_value = ff
–u8adc1_value = ff
–u8adc2_value = ac
–u8adc3_value = ff
eeprom read:1C:A7:70:78:A5:1A
(hjn)bSelectModelViaProjectID = 1
(hjn)u32ProjectIdAddr = 0x1dfc00
(hjn)u32ProjectIdBackupAddr = 0x1dfe00
(hjn)u8eep_id = 0x4
u32ProjectIdAddr = 0x1dfc00 u32ProjectIdBackupAddr = 0x1dfe00
eep_id = 0x4, u8project_id = 0x4
bFactoryDB_Copy = 0
MPOOL size : 0x200000
Changelist: 24543697
============= set bootargs ===============
Hit any key to stop autoboot: 0
ddr MIU0 DDR3 1866
—wya— do_check_safemode
—wya— env_safemode =off
—wya— eep_safemode =0
—wya— before change eep_safemode =0 , env_safemode=off
AC on
—zhangfan— product_state =170
**** do_bootcheck get_boot_mode_from_mtd0 BootMode: 0
**** get_boot_mode_from_env BootMode: 1
**** BootMode: 1
mmc change mount : tvconfig
Loading file “/config/PM.bin” at offset 0x0 from mmc device 0 partition tvconfig
24575 bytes read
Wait for PM51 standby………..PM51 run ok……….. bPmWakeEnableSAR is TRUE…