I use a microwave for years clams C138TA, there is no response after the individual membrane keypad on the touch panel film, the machine does not work failure. The output circuit lines are skeptical public place. Open the case to remove the PC board, the panel found that films and computer signal transmission between the film board cable (also called flexible printed circuit board) insert the key in place, due to long years of serious black oxide. So graze oxide with alcohol, scrub cable

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