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2015-7-24 14:13 上傳
故障現(xiàn)象: 三無(燈亮)
機芯: UL21飛利浦單片
機型: 2513UI,AT25135,AT25215Z,AT2516G,AT2516UG,AT25286,
AT2527,AT25181,AT25166(I),AT2565,AT2565A,AT2565(F),
AT2570UB(I),AT25189B,AT25276,AT25166,AT25206,
AT25276G,AT2565(I),AT25286(F),AT25166G,AT2560B,
AT2590B,AT2590UB,AT25166U,AT25106B,AT25215ZU,AT2575B,
AT2570UB,AT25211A,AT25166I,NT25A11,NT25A21,NT25A51,
AT29189B,AT29106B,AT25289B,AT34189B,AT34281,AT34187,
AT34276,AT34276(F),AT34286,AT34286(I),NT34181B,
AT34U186,2926UI,AT29266,2927U,2927U(I),AT2975,AT29166,
AT29128,AT29286,AT29187,AT29166UG,AT2916UG(F),
AT29166(I),AT29286(I),AT29166G(F),AT29286(F),
AT2960B,AT2916UG,AT25266,AT29215Z,AT29229,AT29329,
AT29386,2526UI,AT29211A,AT2988U,AT2990U
檢修過程: 檢修:開機測TDA9373的1腳(STDBY)始終是高電平,將1腳短路強行 開機,有高壓起振的聲音,說明CPU工作不正常沒有輸出正常的開機指令。開機測TDA9373供電腳54.56.61三腳3.3V供電正常,測晶振兩端電 壓2.2V正常,當測TDA9373的2腳3腳時(SCL、SDA)發(fā)現(xiàn)3腳電壓明顯偏低,說明總線控制不正常,將數(shù)據(jù)線外接各芯片的對應管腳斷開,當斷 開NJW1136的14腳(SDA)時,9373的3腳電壓恢復正常,說明NJW1136損壞,試換之開機一切正常
故障板名稱: 主板
故障元件位號: IC601
處理措施: 更換
圖片: 無
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