Q:

Missing Component Pieces from a PCB

This PCB is from a old Sharp 1999 TV I have been reverse engineering lately; also sorry for any bad images.  I have noticed that there are some "missing" components in the holes of: D4002, D4003, D4001, D4004, and C4002.  Are there certain components that were once in those holes as part of the design?

A:

They could be parts that are used for a different TV or some other product, they could be parts that were in the original design, but later deemed unnecessary.  It could also be a cost saving measure (two parts in parallel in case two lower value parts were cheaper than a higher value part).
The board might work if you add those components back in, or it might stop working if those components are put in.  It is difficult to tell without reverse engineering the whole thing.

