this invention is directed to a test module for and method of testing integrated circuit connections to determine whether or not the circuits are correctly wired and whether or not there are any short circuits or broken connections , as well as any other electrical problems . the system confirms the validity of the electrical interconnections by a visual comparison of the lighted light emitting diodes and the assembly plan ; if the correct comparison is not made , an error in the manufacturing process is indicated . failure of any of the expected light emitting diodes to light indicates missing or electrically bad connections ; extra lighted light emitting diodes indicate extraneous connections or short circuits on the board .