The LR1 and LR2 LEDs are controlled by TinkerBoard.
If you hold the hCfg button and turn on ROSbot, LEDs should be off for about 10 seconds, then on for 3 seconds. After this they should blink alternately.
Sometimes this process can take more time, especially when image was freshly written to SD card.
Did you do any changes on Linux image since the time it was working fine?
Is TinkerBoard booting properly, e.g. can you login to it through RDP or or by connecting with HDMI?