创维37E82RD液晶电视（8K49机芯）不开机的故障维修

摘要：

接修一台创维37E82RD液晶电视(8K49机芯)，故障表现为蓝灯亮，但不开机。拆机检测主板各个供电全部正常，怀疑数据问题，重刷数据无果，最后一招，连接809编程器打印开机信息。鼠标一点，打开电视电源 ，编程器窗

     接修一台创维37E82RD液晶电视(8K49机芯)，故障表现为蓝灯亮，但不开机。拆机检测主板各个供电全部正常，怀疑数据问题，重刷数据无果，最后一招，连接809编程器打印开机信息。鼠标一点，打开电视电源 ，编程器窗口出现了一串串看不懂的字母符号和数字 ：
Boot-
DRAM Channel A Calibration.
Byte 0 : Gating(6 ~ 96), Size=91, Mid=51, Set=51.
Byte 1 : Gating(1 ~ 96), Size=96, Mid=48, Set=48.
HW Byte 0 : DQS(22 ~ 54), Size 33, Set 38, HW_Set 40.
HW Byte 1 : DQS(24 ~ 50), Size 27, Set 37, HW_Set 39.
DRAM A Size = 256 Mbytes.
Boot
Start Pmain
0x0000a000
Nand boot
NID=0x9500f1ec
LZHS addr:0x00100040
LZHS size:0x000aed68
LZHS checksum:0x000000d5
Boot
Start Lmain
MT5389 Boot Loader v0.9
Boot reason: A/C power on!!
Load VGA internal EDID.................
Load HDMI internal EDID.................
CEC Physical offset 159
HDMI1 Physical adr 0x10
HDMI1 PA 0x10
HDMI1 checksum 0x9d
HDMI2 PA 0x20
HDMI2 checksum 0x8d
HDMI3 PA 0x30
HDMI3 checksum 0x7d
HDMI4 PA 0x40
HDMI4 checksum 0x6d
SIF_Master0: new design
SIF_Master1: old design
EEPROM_Read()  0
EEPROM_Read()  1
EEPROM_Read()  2
EEPROM_Read()  3
EEPROM_Read()  4
EEPROM_Read()  5
EEPROM_Read()  6
EEPROM_Read()  7
EEPROM_Read()  8
EEPROM_Read()  9
EEPROM_Read() failed
### EEPROM read loader config failed!!!
IR DATA register : 0x       0
Boot reason: A/C power on!!T8032 init A/C on case loader stage...
Load T8032 FW (addr: 0x  d7c1d0, size: 24576)success!!
T8032 FW version: 71
T8032 change to loader stage...
LDR_FlashCopy 0xf010 0x43080 0x80
Detect NAND flash ID: 0x9500F1EC
Detect SS K9F1G08U0B/C/D NAND flash(SLC): 128MB
NAND_BDM_Mount: Partid=0, offset=0x0, size=0x200000
NAND_BDM_Mount: Partid: 0, Total Block Count: 16, Bad Block Count: 0
IR DATA register : 0x       0
Boot reason: A/C power on!!T8032 init A/C on case loader stage...
Load T8032 FW (addr: 0x  d7c1d0, size: 24576)success!!
T8032 FW version: 71
T8032 change to loader stage...
Boot reason: A/C power on!!Boot reason: A/C power on!!Org:0x00 Flags:0x10
EEPROM_Read()  0
EEPROM_Read()  1
EEPROM_Read()  2
EEPROM_Read()  3
EEPROM_Read()  4
EEPROM_Read()  5
EEPROM_Read()  6
EEPROM_Read()  7
EEPROM_Read()  8
EEPROM_Read()  9

EEPROM_Read() failed

   勉强看懂了。

    接下来就是查IIC总线了，测试UM5(24C32)5、6脚电压相差很大，经查UM5总线只有两路、一路去主芯片另一路去高频头。先简后繁原则先把高频头总线切断，然后开机，熟悉的音乐声出现了！UM5  5、6脚电压也恢复正常了。考虑到本机高频头已没用途，至此本机已算修复逐交付用户。