### [联想拯救者R720-15IKBN 板号NM-B191 REV:1.0 加电无显，上电不亮机通病](https://www.cfixn.com/topic/1252)

**Published:** 2026-09-19T16:14:37

**Author:** admin

**Excerpt:** 联想拯救者R720-15IKBN 板号NM-B191 REV;1.0上电不亮机通病，电流在1.6和1.4之间来…

联想拯救者R720-15IKBN   板号NM-B191  REV;1.0上电不亮机通病，电流在1.6和1.4之间来回有规律的跳，客户拿过来就是这个故障。看到一版主的帖子故障很相似。故障原因是PU2001转换管的3脚，和4脚短路。用烧机很快烧到EC边上的电容短路，取掉完美亮机。

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