创维创维55S1YP（8H52机芯）灰屏

cjt

创维创维55S1YP（8H52机芯）灰屏（背光亮），检测主板12V、3.3V、5V、1.2V、1.8V、1V都正常,求助！下面是打印信息
2023-6-6, 9:32:4
COM4, BaudRate:115200 bps, RXD: VGA->15,TXD: VGA->12, Printed by RT809H:


Bootrom start
Boot Media: eMMC
Decrypt auxiliary code ...OK
Entry boot auxiliary code


Reg Version:  v1.5.3p
Reg Time:     2017/06/16 16:32:23
Reg Name:     hi3751v551dmoA_2layers_cpu1100Mbps_DDR4_1866_2048M_1024Mch0_1024Mch1_emmc.reg



DDRTR Suc
Boot auxiliary code success
Bootrom success



System startup



Fastboot 3.3.0 (www-data@rjyby07) (Jun 11 2020 - 05:51:02)


Fastboot:      Version 3.3.0
Build Date:    Jun 11 2020, 05:51:44
CPU:           Hi3751v550
Boot Media:    eMMC



Found flash memory controller hifmc100.
MMC:   Synopsys Mobile storage: 0
MMC/SD Card:
    MID:         0x000090
    OID:         0x014a
    PSN:         0x0c381c3f
    DATA:        08/2018
    Name:        "H8G4a?
    Chip Type:   MMC
    Version:     UNKNOWN
    Timing:      HS
    Host Clk:    50000000Hz
    Host Div:    0
    Bus Width:   8bit
    Chip Size:   7818182656 Bytes (High Capacity)
    Read Block:  512 Bytes
    Write Block: 512 Bytes
    Boot Addr:   0


The DDR memory layout:
      page table: 0x0c000000 - 0x0c400000  4 MiB
           stack: 0x0c400000 - 0x0c800000  4 MiB
       irq stack: 0x0cafff7c - 0x0cbfff7c  1 MiB
     global data: 0x0cbfffc4 - 0x0cc00000  60 Bytes
          malloc: 0x0cc00000 - 0x10c00000  64 MiB
           .text: 0x10c00000 - 0x10c8e64c  569.6 KiB
            data: 0x10c8e64c - 0x10d3ef00  706.2 KiB


Boot Env on eMMC
    Env Offset:          0x00100000
    Env Size:            0x00010000
    Env Range:           0x00010000


in load_mcu_image:
enter getLedDisturbinMode


getIRSystemCode exit,IRSystemCode=14
Get IR system code = 0x0E
after change ir system code,wakeup ir key is:0xF30C0E0E
after change ir system code,wakeup ir key is:0xED120E0E
after change ir system code,wakeup ir key is:0xEC130E0E
after change ir system code,wakeup ir key is:0x6E910E0E
saved param:uSkyModelTitle=85,uSkyTypeTitle=170, uLogo=255
EEP Derive switch is open and not set derive successThe end number pos = 4
The end number pos = 4
Derive info skyModel : 8H55
Derive info skyType : S1YP
set derive tv success
SDK_VERSION: [HiDPTAndroidV300R002C01SPC050_20170710]
Set CEC onetouchplay :0
saved param:bootmode=1,bootsel=0 u8ChildLock=0
BootMode = POWER OFF
BootMode = 1 ACDC = 0
will_enter_recovery = 0
boot_after_reboot = 0
Go to sleep
in boot_suspend,POWERON_FLAG=0
System suspend.
poweroff_led



======== [MCU PARAM] ========

SYSID: 0x19060550

DBGMASK: 0x00000001

SUSPENDTYPE: 0x00000000

GPIO POWER KEY: 0x00000000

GPIO LEVEL: 0x00000000

TIMER WAKEUP: 0xFFFFFFFF

IRTYPE: 0x00000004

IR NUM: 0x00000004

IR KEY: 0xF30C0E0E

IR KEY: 0xED120E0E

IR KEY: 0xEC130E0E

IR KEY: 0x6E910E0E

LSADC ZERO: 0x00000000

LSADC channel A enable

LSADC GLITCHSAMPLE: 0x00000005

LSADC TIMESCAN: 0x00000258

LSADC POWERKEY0: 0x00000000, 0x000000EC

LSADC POWERKEY1: 0x000000FF, 0x000000FF

LSADC POWERKEY2: 0x000000FF, 0x000000FF

LSADC POWERKEY3: 0x000000FF, 0x000000FF

UART Wakeup Key: 0x000000FF

Auto wakeup flag: 0x00000000

Wakeup Condition: 0x00000041

board_type mask(0:no use 1:G3 2:E388G/E388A 3:E392G/E396G): 0x00000001

board_config_mask: 0x00000000

set_gpio_mux

Light off
CEC ONE Play:0x00000000

HDMIRX_CLK_WKUP:0x00000000

HDMIRX HPD invert:0x00000006

HDMIRX HPD function:0x00000000

HDMIRX bCecWkup:0x00000000

HDMIRX enSuspendPort:0x00000005

HDMIRX HI3751V550on't Need Clk Wake Up

Don't Need Clk Wake Up

Don't Need Clk Wake Up

lsadc:6bit,data_delta=8,enable deglitch,power down,continue scan
======== [MCU Init Ready] ========

Power down ARM ===>

Set MCU to 24MHz ===>

Config bus core idle state ===>

Test bus core state ===>

DDR_PowerCtrl:0
set_gpio_mux

set_gpio_mux

======== [ARM Power Down] ========

Wait for 2s ...

======== [Waiting for Powerkey] ========

孟津家电维修

这个打印信息看不出什么有用的，最后显示系统已经正常跑完，处于待机状态，这时候应该可以遥控开关机，问题应该出在板载TCON电路，脱开两根FFC屏线测一下VGH，VGL电压是否正常？正常再插好屏线再测，这个机器最常见就是tcon电路电容短路，还有一部分屏问题（可以分别断开一边屏线试试）

cjt

孟津家电维修 2023-6-6 10:55
这个打印信息看不出什么有用的，最后显示系统已经正常跑完，处于待机状态，这时候应该可以遥控开关机，问题 ...

分别断开两边屏线，通电开机，故障依旧

晨星电器

cjt 2023-6-6 11:22
分别断开两边屏线，通电开机，故障依旧

脱开两根FFC屏线测一下VGH，VGL电压是否正常？脱开两处电压正常的话就是屏那边问题了  脱开两处后电压还是没有就查TCON电路

坊镇电脑

屏有问题了吧

孟津家电维修

cjt 2023-6-6 11:22
分别断开两边屏线，通电开机，故障依旧

那你分别断开排线后VGH，VGL电压有没有？

cjt

孟津家电维修 2023-6-6 18:25
那你分别断开排线后VGH，VGL电压有没有？

主板上好像没有这两个电压。不知哪位有电路图？

cjt

换了主板，故障依旧,，主板上还是两个地方没电压