Theca cells always have LHR (Luteinizing Hormone Receptor), but never FSHR (Follicle Stimulating Hormone Receptor).

LH stimulates the theca cells to produce androgens and progesterone.

Granulosa cells have FSHR, which allows them to respond to FSH.

FSH stimulates granulosa cells to produce estrogen during the follicular phase.

LHR is acquired by granulosa cells from the mid-follicular phase onwards, but only in the dominant follicle (DF), enabling LH to also drive progesterone and estrogen production in the later stages.

Review: Folliculogenesis (Physiology 2)