I tested the circuit and the TPS61230 don't startup. The output voltage freezes between 1-1.5V. The voltage at Css is about 300mV. In the datasheet the Css should be loaded till 0.5V and after this the soft starting is over and it will be charged to the regulated output voltage. The pin En is shortcuted to Vin.
Sometimes it happens that after some time I get the regulated output voltage of 4.2V and everything is ok.
Do you have any hint, to find the issue?