This is a working main board TNPH0912AD coming out of  Panasonic TC-P55ST30 that was abandoned in our shop due to defective panel.

TNPH0912[A] can be seen printed on the board and many chop-shops list that as a board number, but it isn't and it's wrong to do that.

The same PCB board - TNPH0912[A] - is used for many different assemblies, as in many different TV sizes with different panels, different (even if not by much) driving signals etc.

So the final product numbers for say 50'' and 55'' TVs are different enough that the two boards can not be and must not be mixed.

The difference is denoted in a small table printed on the PCB itself, right next to the TNPH0912[A] label.

It shows suffix letter configurations from NIL , followed  by AB, AC and so on all the way to AW.

The exact configuration is determined by the presence of small jumper components to solder two points in the corresponding column.

See the second listing picture for illustration.

It is not a good idea to buy a board if it is merely listed as "TNPH0912" or "TNPH0912A" nor it is a good idea to get boards from different models than the one you are looking for...even if they seem to be the same.

They are only the same if they have the same resistors in soldered in that table!