Dell Power Board 755.A2L04.0001 is a monitor power board intended for Dell U2419H and U2419H WOST displays. It is a replacement component for the power section of these monitor models.
The listing identifies the part by the exact manufacturer reference 755.A2L04.0001 and names the two compatible monitor models. This makes its purpose clear: it is a model-specific internal board for servicing a Dell monitor, rather than an external power adapter.
Use the stated model references to identify the component when sourcing a board for a supported monitor.