廠商性質：經銷商

所在地：上海市

更新(xin)時間：2024-06-09

產品簡介：

包修好西門子MP277觸摸屏使用中突然白屏；你為維修(xiu)(xiu)后(hou)，怕數(shu)據程序(xu)丟(diu)失擔心嗎？公司拿到(dao)設備(bei)后(hou)，在檢測(ce)的(de)過程中，先幫用戶拷貝機器里面的(de)數(shu)據，做備(bei)份，然(ran)后(hou)在進行(xing)修(xiu)(xiu)理，維修(xiu)(xiu)技術強(qiang)，經驗足

包修好西門子MP277觸摸屏使用中突然白屏； 出現白屏現象表示背光板能正常工作，首先判斷主板能否正常工作，可按電源開關查看指示燈有無反應，如果指示燈可以變換顏色，表明主板工作正常。
1、檢查主板信號輸出到屏的連接線是否有接觸不良（可以替換連接線或屏）。
2、檢查主板各個工作點的電壓是否正常，特別是屏的供電電壓。
 3、用示波器檢查行場信號和時鐘信號（由輸入到輸出）。
4、換(huan)上以寫程序的通用板試機，如指(zhi)示(shi)燈無(wu)反應或不亮，表明主板工作不正常。

西門(men)子觸(chu)摸屏(ping)故(gu)障(zhang)現(xian)(xian)(xian)象：通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)DC24伏(fu)(fu)，屏(ping)幕(mu)(mu)無光(guang)，電(dian)(dian)(dian)(dian)(dian)(dian)流約230mA 處理過(guo)(guo)程(cheng)(cheng)(cheng)：用(yong)手接觸(chu)屏(ping)幕(mu)(mu)，蜂(feng)鳴器有(you)(you)呼(hu)應，闡(chan)明程(cheng)(cheng)(cheng)序(xu)運(yun)行正(zheng)(zheng)(zheng)常(chang)。量(liang)高(gao)(gao)壓(ya)(ya)(ya)條12伏(fu)(fu)DC電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)正(zheng)(zheng)(zheng)常(chang)，操控電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)ENABLE低有(you)(you)用(yong)為低電(dian)(dian)(dian)(dian)(dian)(dian)平正(zheng)(zheng)(zheng)常(chang)。闡(chan)明毛病在(zai)高(gao)(gao)壓(ya)(ya)(ya)發作電(dian)(dian)(dian)(dian)(dian)(dian)路或燈(deng)管現(xian)(xian)(xian)已損壞(huai)(huai)。拆開發現(xian)(xian)(xian)燈(deng)管一(yi)頭(tou)現(xian)(xian)(xian)已發黑，替換燈(deng)管后(hou)仍然無光(guang)，查看高(gao)(gao)壓(ya)(ya)(ya)變(bian)壓(ya)(ya)(ya)器也已損壞(huai)(huai)。市面上無此高(gao)(gao)壓(ya)(ya)(ya)變(bian)壓(ya)(ya)(ya)器，于是(shi)買一(yi)個LCD的(de)帶(dai)兩管的(de)高(gao)(gao)壓(ya)(ya)(ya)條，接好(hao)線(xian)后(hou)固定，通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)正(zheng)(zheng)(zheng)常(chang)。故(gu)障(zhang)現(xian)(xian)(xian)象：通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)后(hou)屏(ping)幕(mu)(mu)無顯示，電(dian)(dian)(dian)(dian)(dian)(dian)流約100mA修(xiu)正(zheng)(zheng)(zheng)過(guo)(guo)程(cheng)(cheng)(cheng)：用(yong)手接觸(chu)屏(ping)幕(mu)(mu)，蜂(feng)鳴器無呼(hu)應，闡(chan)明程(cheng)(cheng)(cheng)序(xu)運(yun)行不正(zheng)(zheng)(zheng)常(chang)。萬用(yong)表丈量(liang)幾(ji)組電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)3.3伏(fu)(fu)、5.1伏(fu)(fu)、12伏(fu)(fu)都(dou)正(zheng)(zheng)(zheng)常(chang)。據(ju)用(yong)戶反映，用(yong)戶發現(xian)(xian)(xian)接觸(chu)屏(ping)毛病后(hou)曾(ceng)企(qi)圖(tu)修(xiu)理，在(zai)通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)的(de)過(guo)(guo)程(cheng)(cheng)(cheng)中(zhong)，呈現(xian)(xian)(xian)過(guo)(guo)一(yi)次正(zheng)(zheng)(zheng)常(chang)的(de)狀(zhuang)況，但斷電(dian)(dian)(dian)(dian)(dian)(dian)后(hou)再次通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)就不行了。剖析芯(xin)片某個腳(jiao)(jiao)位(wei)有(you)(you)虛焊(han)，使得總線(xian)過(guo)(guo)錯，然后(hou)程(cheng)(cheng)(cheng)序(xu)不能(neng)跑(pao)動。遂用(yong)熱(re)風槍對密腳(jiao)(jiao)芯(xin)片焊(han)腳(jiao)(jiao)加熱(re)，同時用(yong)鑷子按壓(ya)(ya)(ya)芯(xin)片，使焊(han)腳(jiao)(jiao)和錫從(cong)頭(tou)熔合(he)。通(tong)過(guo)(guo)以上處理后(hou)，從(cong)頭(tou)開機(ji)，電(dian)(dian)(dian)(dian)(dian)(dian)流上升到470mA，一(yi)切(qie)正(zheng)(zheng)(zheng)常(chang)。