The objective of this paper is to analyze the excess of failures in a mobile phone line production in order to make process improvements in a factory of the industrial pole of Manaus (PIM) by using FMEA methodology (Failure Mode, effect analysis). The excess of failures was an extremely influential aggravating factor by its customer, since the increase of the productive capacity in the company would be determined by the reduction of the percentage of failures or increase of YIELD from the conception of the product until the final phase of its life. Tracing the root causes is an important step in improving manufacturing processes for reducing failures. The impact of this is the reduction in industrial costs and an increase in the quality index of the product, ensuring customer satisfaction in having to produce its product in a factory that operates under condition the EMS (Electronic Manufacturing Services).