alexey I can't spot any issue in SW or HW. It's possible that RAM frequency is set too high and that other TX6 mini boxes worked only by chance. Can you please give me also serial output during Android boot? At the very beginning, DRAM settings should be mentioned, like frequency and dram_para1 and dram_para2 (or something similar).
Thank you for efforts! The only mention of "dram" is:
Code
[175]DRAM VERSION IS V2_78
[177]the chip id is 0x00000003
[181]the chip id is 0x00000003
[184]the chip id is 0x00000003
[187]the chip id is 0x00000003
[190]the chip id is 0x00000003
[193]chip id check OK
[195]DRAM CLK =648 MHZ
[197]DRAM Type =3 (3:DDR3,4:DDR4,6:LPDDR2,7:LPDDR3)
[202]DRAM zq value: 003b3bfb
[506]IPRD=00930093--PGCR0=00000f7d--PLL=b0003500
[511]para1 = 0000310b,para2 = 08000001
[521]DRAM simple test OK.
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The log file is in the attacment: tx6mini.log