Boardview for the HP Compaq 610 notebook, covering mainboard 6050A2256501-MB at revision A01, with the VV09 project code shown in the name. The 6050A numbering belongs to Inventec, the ODM that built this board for HP. The .brd layout opens in tools such as OpenBoardView, FlexBV or Boardviewer, where you can search part designators, follow nets between components and find test points while chasing a short or a missing rail. Compare the board number and revision silkscreened on the PCB before trusting pin positions.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @boardviews. Enginerys does not host this file.
How to open a .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.