dellfer

Hello, @tooz. I found broken IC. More likely it is voltage regulator. I suspect Syr837/838.

UPD: I found broken chip PU5. Where can i find boardview for identify this chip?

Hi all. Tinker Board 2S do not boot. In the UART console log I saw: PMIC: RK808 rk8xx_write: write reg 0x4f failed, ret=-121 virq_add_chip: Set mask register 0x4f failed, ret=-121 rk8xx_read: read reg 0x2f failed, ret=-121 vdd_center -121 uV rk8xx_write: write reg 0x23 failed, ret=-121 vdd_cpu_l 900000 uV rk8xx_read: read reg 0x23 failed, ret=-121 rk8xx_write: write reg 0x23 failed, ret=-121 rk8xx_write: write reg 0x90 failed, ret=-121 rk8xx_write: write reg 0x24 failed, ret=-121 rk8xx_write: write reg 0x24 failed, ret=-121 rk8xx_write: write reg 0x24 failed, ret=-121 rk8xx_read: read reg 0x24 failed, ret=-121 rk8xx_write: write reg 0x24 failed, ret=-121 rk8xx_write: write reg 0x24 failed, ret=-121 rk8xx_write: write reg 0x24 failed, ret=-121 rk8xx_write: write reg 0x23 failed, ret=-121 vdd_log 1100000 uV rk8xx_read: read reg 0x49 failed, ret=-121 -121 uV is too high from LDO_REG8 RK808 is dead?