| 故障表现为：热机跳菜单 检修与分析：出现故障时测U002的18脚电压只有2.5V,正常应为3.3V,断开R043后18脚为3.3V,但按键脚任然低，断开R009， C011，R291后电压还是低，怀疑过孔漏电，割开R043和R291两处的铜箔，用导线相连，试机故障机修到这里，终于修好值得探讨。。 |
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