Не включается планшет Cube u55gt⁠⁠

Здравствуйте, планшет Cube u55gt не включается, экран черный. АКБ заряжен, зарядка проходит. При прошивке выдает ошибку 3154 S_DA_SDMMC_WRITE_FAILED. При этом тест памяти вроде как проходит.

============ Memory Detection Report ===========

Internal RAM:

External RAM:

Type = DRAM

Size = 0x40000000 (1024MB/8192Mb)

NAND Flash:

ERROR: NAND Flash was not detected!

EMMC:

EMMC_PART_BOOT1 Size = 0x0000000000200000(2MB)

EMMC_PART_BOOT2 Size = 0x0000000000200000(2MB)

EMMC_PART_RPMB Size = 0x0000000000020000(0MB)

EMMC_PART_GP1 Size = 0x0000000000000000(0MB)

EMMC_PART_GP2 Size = 0x0000000000000000(0MB)

EMMC_PART_GP3 Size = 0x0000000000000000(0MB)

EMMC_PART_GP4 Size = 0x0000000000000000(0MB)

EMMC_PART_USER Size = 0x00000003ac000000(15040MB)

UFS:

ERROR: UFS was not detected!

============ RAM Test ============

Data Bus Test:

[D0]

.

.

[D31]

OK!!

Address Bus Test:

[A1]

.

.

[A29]

OK!!

RAM Pattern Test :

Writing ...

0x44332211,

0xA5A5A5A5,

0xA5A5A500,

0xA500A500,

0xA5000000,

0x00000000,

0xFFFF0000,

0xFFFFFFFF,

OK!!

Increment/Decrement Test:

Writing...

OK!!

============ RAM Test ============

Вот отладочная информация из Uart.

▒[PWRAP] pwrap_init_preloader

[PWRAP] pwrap_init

[PWRAP] _pwrap_init_sidly [Read Test] pass,SIDLY=0 rdata=5AA5

[PWRAP] _pwrap_init_sidly [Read Test] pass,SIDLY=1 rdata=5AA5

[PWRAP] _pwrap_init_sidly [Read Test] pass,SIDLY=2 rdata=5AA5

[PWRAP] _pwrap_init_sidly [Read Test] pass,SIDLY=3 rdata=5AA5

[PMIC_WRAP]wrap_init pass,the return value=0.

pl pmic init start

pl pmic efuse start

pl pmic efuse BUCK trim

[0x1C8]=0xB802

[0x1CA]=0x807F

[0x20E]=0xE0

[0x260]=0xE0

[0x286]=0xF0

pl pmic efuse end

pl pmic en rst [0x126]=0x13

[0xE]=0x1

[0x540]=0xA0

Battery exist

[0xE]=0x1

[0x540]=0xA0

pl vm read [0x290]=0x7F

pl vm no need tune

pl vm check [0x290]=0x7F

pl pmic init done

[PLFM] Init I2C: OK(0)

[PLFM] Init PWRAP: OK(0)

[PLFM] Init PMIC: OK(0)

[PLFM] chip[CA00]

[BLDR] Build Time: 20130802-191315

==== Dump RGU Reg ========

RGU MODE: 6D

RGU LENGTH: FFE0

RGU STA: 0

RGU INTERVAL: FFF

RGU SWSYSRST: 0

==== Dump RGU Reg End ====

RGU: g_rgu_satus:0

mtk_wdt_mode_config mode value=2D, tmp:22000030

PL P ON

WDT does not trigger reboot

mtk_wdt_mode_config mode value=70, tmp:22000071

kpd register for pmic set!

mt_usb_calibraion: input_reg = 0x0

mt_usb_calibraion: term_vref = 0x0, clkref = 0x0, vrt_vref = 0x0,

[RTC] get_frequency_meter: input=0x0, ouput=794

[RTC] External crystal exist

[RTC] bbpu = 0x8, con = 0x8426

[RTC] powerkey1 = 0x0, powerkey2 = 0x0

[RTC] irqsta = 0x0, pdn1 = 0x8000, pdn2 = 0x201, spar0 = 0x40, spar1 = 0x800

[RTC] new_spare0 = 0x0, new_spare1 = 0x1, new_spare2 = 0x1, new_spare3 = 0x1pl pmic powerkey Release

hw_set_cc: 450

[0x0]=0x7B

[0x1]=0x7B

[0x2]=0xB2

[0x3]=0xB2

[0x4]=0x8C

[0x5]=0x8C

[0x6]=0x1F

[0x7]=0x1F

[0x8]=0xC

[0x9]=0xC

[0xA]=0x0

[0xB]=0x0

[0xC]=0x41

[0xD]=0x41

[0xE]=0x1

[0xF]=0x1

[0x10]=0x0

[0x11]=0x0

[0x12]=0x0

[0x13]=0x0

[0x14]=0x60

[0x15]=0x60

[0x16]=0x0

[0x17]=0x0

[0x18]=0x0

[0x19]=0x0

[0x1A]=0x10

[0x1B]=0x10

[0x1C]=0x0

[0x1D]=0x0

[0x1E]=0x1

[0x1F]=0x1

[0x20]=0x1

[0x21]=0x1

[0x22]=0x0

[0x23]=0x0

[0x24]=0x0

[0x25]=0x0

[0x26]=0x0

[0x27]=0x0

[0x28]=0x21

[0x29]=0x21

[0x2A]=0x14

[0x2B]=0x14

[0x2C]=0x41

[0x2D]=0x41

[0x2E]=0xD4

[0x2F]=0xD4

[0x30]=0x0

[0x31]=0x0

[0x32]=0x0

[0x33]=0x0

[0x34]=0x0

[0x35]=0x0

[0x36]=0x0

[0x37]=0x0

[0x38]=0x55

[0x39]=0x55

[0x3A]=0x0

hw_set_cc: done

[PLFM] USB/charger boot!

[RTC] rtc_bbpu_power_on done

[SD0] Bus Width: 1

[SD0] SET_CLK(260kHz): SCLK(259kHz) MODE(0) DDR(0) DIV(193) DS(0) RS(0)

[SD0] Fail in SEND_OP_COND cmd

[SD0] init card failed

found:1,i:0

[EMI] DDR3

[EMI] eMMC/NAND ID = 0,0,0,0,0,0,0,0,0

[EMI] MDL number = 0

init ddr3 x32

Delay test

rank 0 coarse = 12

rank 0 fine = 40

10:| 0 1 1 1 0 0

opt_dle value:7

byte:0, (DQS,DQ)=(8,8)

byte:1, (DQS,DQ)=(8,9)

byte:2, (DQS,DQ)=(8,8)

byte:3, (DQS,DQ)=(8,B)

[EMI] DRAMC calibration passed

[MEM] complex R/W mem test pass

[SD0] Bus Width: 1

[SD0] SET_CLK(260kHz): SCLK(259kHz) MODE(0) DDR(0) DIV(193) DS(0) RS(0)

[SD0] Switch to High-Speed mode!

[SD0] SET_CLK(260kHz): SCLK(259kHz) MODE(2) DDR(1) DIV(96) DS(0) RS(0)

[SD0] Bus Width: 8

[SD0] Size: 15040 MB, Max.Speed: 52000 kHz, blklen(512), nblks(30801920), ro(0)

[SD0] Initialized

[SD0] SET_CLK(52000kHz): SCLK(50000kHz) MODE(2) DDR(1) DIV(0) DS(0) RS(0)

msdc_ett_offline_to_pl: size<2> m_id<0x70>

msdc <0> <HYNIX > <MMC16G>

msdc <1> <xxxxxx> <MMC16G>

msdc failed to find

*******EMMC_INFO*******

eMMC partition size(1 block = 512Bytes):

BOOT1:<4096> blocks

BOOT2:<4096> blocks

RPMB :<256> blocks

GP1 :<0> blocks

GP2 :<0> blocks

GP3 :<0> blocks

GP4 :<0> blocks

USER :<30801920> blocks

*******EMMC_INFO*******

▒▒▒▒▒▒▒▒▒▒▒ Boot Device: OK(0)

Смущает что пишет Boot Device OK, при этом не может найти вторую оперативку. (на плате их две sk hynix h5tq4g63afr)

msdc <1> <xxxxxx> <MMC16G> msdc failed to find

Куда копать, в сторону флешки или оперативки?

Опыта в ремонте планшетов нет, имеются прямые руки, паяльная станция.