A multi-port tire pressure detecting system includes a plurality of pressure detection units and a pressure processing unit. Sub-connectors 20A and 20B, which are respectively fitted into fitting cavities 11A and 11B of a frame 10, are each provided with a connector housing 21, and a cover 45A and 45B respectively. The method further comprises inspecting the patterned multi-layer photoresist for defects and re-working the patterned multi-layer photoresist upon a failed inspection. Therefore, when casting from P-N junction of the light-emitting diode, the light will go through with directions of the top portion of epitaxial layer and transparent substrate.