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海信HZ49A65 开机停在LOGO界面维修实例

案例题目: HZ49A65 开机停在LOGO界面

关联产品: HZ49A65

机芯方案: HI3751-V5510

故障现象: 开机停在LOGO界面

故障原因分析: 不开机,排除电源板故障后,首先测量主板上的DC-DC、LDO输出电压是否正常,如果正常连接工装观察一下打印信息,进一步进行判断

检修过程: 测量主板上的DC-DC、LDO输出电压未发现异常,连接工装,打印信息如下:
——–Set Backlight on :1—
PANEL_DRV_SetBlDriverPower[1742]ERROR: INFO:set pdmparam version=1.0.0.2 tconparam=0x2bbfd000,0x1000 panelparam=0x2bbf2000,0xa000 SR_ZME_COEF=0x2bbef000,0x2000 HIFB_ZmeCoef=0x2bae6000,0x3000 HIFB_DispBuf_HD=0x2b2fc000,0x7e9000 .
INFO: fdt_add_mem base = 2bbfd000,len = 1000
INFO: fdt_add_mem base = 2bbf2000,len = a000
INFO: fdt_add_mem base = 2bbef000,len = 2000
INFO: fdt_add_mem base = 2bae6000,len = 3000
INFO: fdt_add_mem base = 2b2fc000,len = 7e9000
bl33_ep->spsr = 0x3C5
Start Warm reseting
NOTICE: BL31: v1.2(release):fcfc964
NOTICE: BL31: Built : 10:38:07, Nov 4 2017

Starting kernel …
更换HI3751V5510后故障排除

故障板号: RSAG7.820.7941

故障元件: HI3751V5510

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