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三星510B型顯示器按下電源開關無反應

發布日期:2022-04-27 點擊率:105 品牌:三星_SAMSUNG

        測單刀雙擲開關非公共端的兩端間電阻值無論在開關狀態如何情況下均為2kΩ不變。拆下測量卻一切正常!分析電路中存在故障。測試發現開關電源厚膜塊IC601的{3}腳(線路板上標有VCC)與{2}腳短路,{2}腳為接地(熱),說明電源厚膜IC的工作電源對地短路。翹起IC601的{3}腳測量阻值正常,經查是D630擊穿損壞。D630為玻璃封裝1/8W27V穩壓管,用SA24A(直流穩壓值約在27~40V代換。開機顯示器工作恢復正常。

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