(like a Compal or Wistron part number) printed elsewhere on the board. You can find general technical documents and requested diagrams for these boards on platforms such as:
These boards are typically "Open LDI" or generic power/logic combos sold to system integrators. Unlike a motherboard from ASUS or Gigabyte, Hannstar does not host a support page for the J MV-4 because it is a B2B component, not a consumer retail product.
Do you have a repair question about this specific board? Drop the error code in the comments below!