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2015-7-24 13:04 上傳
故障現(xiàn)象: 三無(燈亮)
機芯: 飛利浦解碼OM88**(大屏幕)
機型: 2502D,2516B,2516D,2516DI,2516BI,2580DB,2510G,AT2575,
2575D,2515DZ,2580GI,2580G,2588DB,2511DI,2511D,2511DR,
2511DZ,2575DI,AT2515DZ,AT2590I,AT2590,AT2580D,AT2575D,
AT2575DI,AT2575DZ,AT2575F,AT2588D,AT2539,2939D,2939DR,
2965D,2989D,2913D,2975,2956D,2927D,2915DZ,2988DB,2916D,
2988D,2980G,2980GI,2980DB,2975D,2910G,2910DZ,2910D,2911,
2911D,2911DI,2911DZ,2980D,2988DF,2988DI,2975DI,AT2975D,
AT2980D,AT2980DB,2539D,2539DR,2539DI,3406D,3433D,3433DZ,
3409D,3416,3416D,3416DI,3418D,3416D(F),3438D,3480GI,3488GI,
3460D,3488D,34D106,AT3480DZ,AT3486DI,AT3460D,AT3416D(F),
AT3488DZ,2988G,2988D-F,2911Z,AT2990,AT2915DZ,AT2990I,
AT2975F,AT2975I,AT2988D,AT3480GI,3811DI,2589D,AT2556,AT2988,
AT2988DB,AT2956B,AT2911DZ,AT2915,AT2939,AT2956,AT2975Z,
AT2986Z,AT2575I,AT2586,3488BD,AT3486DZ
檢修過程: 2916D不定時燒行管:最初接到此機時行管已經(jīng)損壞(此機曾被非TCL維修工 修過),重新更換行管圖象和伴音都正常,測量電路中電壓均正常,觀看一段時間后,故障出現(xiàn):屏幕兩邊縮小并且行不同步,發(fā)出吱吱尖叫聲,立即關(guān)機。此時用 手模行管散熱片,溫度明顯偏高。依經(jīng)驗懷疑行頻偏離所至,于是將晶體及周圍小電容逐一更換,接下來繼續(xù)試機,故障依舊,繼續(xù)更換OM8838、行輸出變壓 器、行推動變壓器、逆程電容等元件,還是出現(xiàn)故障。最后用加熱法對小部件進行逐一加熱,當(dāng)吹到行推動管時故障顯現(xiàn),最后把行推動管(Q401)BF422 更換成C4544,故障排除。
故障板名稱: 主板
故障元件位號: Q401
處理措施: 更換;Q401(C4544)
圖片: 無
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