Lg electric range had PF code. I cleared but the only thing on now is the clock. Since the clock works I believe we have power, anything else to make oven and burners to work

SOURCE: clock,timer and oven does not work on Kenmore gas Range

Unplug the unit and see if this will reset the board. If this doesn't work then replace the oven control board.

SOURCE: whirlpool oven doesn't work model gs563lxss

We had those same symptoms with our range out of the box. It was a problem with the PC board and it was fixed under warranty.

SOURCE: Inglis electric freestanding range model #IRE3230- Oven no longer working

If the oven and the electric panel no longer work, this is an electronic problem. The burners and the oven light will not be effected, nor will the fuses. The electronics card will need to be replaced by an appliance technician.

SOURCE: Frigidaire Electric flat top Range

My range will not hold the heat for either the convection or regular heat. the model number is CGLEF385AS2

SOURCE: LG Electric Range Oven Keeps Shutting Off

When you say "Just shut off" do you mean the circuit breakers would trip, or fuses would blow? If so, I would have an electrician check that the circuit is properly fused/breakered and wire sized for the amount of power required by the oven. If the installation directions say it needs a 50 amp service, it better be a 50 amp service.
If shutting off is just something within the oven, then get LG back out again, and let us know of what they say is wrong.