Problems with starting from SD at unnamed board

[ibasta]

Hello!

I've got unnamed board with Allwinner A20 and FORESEE 8G memory, in completed device with HR215WU1-120 LVDS display.
 

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It was working on Android 4.0 system, but someone needed to replace android with linux os system.

LVDS display was lost when owner put SD card with linaro in slot for the first time.

 

Now we have Linaro 14.04 command line,

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and SD class 10 card with Armbian_20.02.0-rc1_Cubieboard_bionic_current_5.4.14 image, burned with Etcher.

So.

If power on without SD card - linaro starting in command line.

If try to boot with SD card in slot - we got only "no signal" on HDMI display.

 

Can anyone help me with this?

Thx, hgd.