| 摘要 |
PROBLEM TO BE SOLVED: To detect which part of an integrated circuit failures and to which lead terminal of the integrated circuit the failing circuit corresponds, by setting a failure diagnosis circuit part in the integrated circuit. SOLUTION: If an integrated circuit part, for example, 51a breaks down because of an excess current or static electricity impressed to the integrated circuit part, a diagnosis diode 41a corresponding to a lead terminal 12a of the integrated circuit part 51a is also broken down at the same time. The breakdown of the diode 41a brings about a short circuit and, the diode 41a having been connected in an opposite direction and shut a current from the integrated circuit part is substituted with a conductive wire 41aa as indicated by a chain line. It can be confirmed that the IC(internal) circuit 51a corresponding to the short-circuited lead terminal 12a fails by inspecting connections between a failure diagnosis lead terminal 14 of the integrated circuit and each of the lead terminals of the integrated circuit part. |
