维修手册4 (3)

按一下以編輯母片標題樣式,*,按一下以編輯母片,第二層,第三層,第四層,第五層,PE/FA,維修手冊,Repair manual,内容簡介,Content,abstract,對於短路板如何維修,。,How to repair short circuit board.,CPU,電壓異常如何維修。,How to repair CPU voltage problem board.,音效不良維修方法。,How to repair audio NG.,不通電幾種狀況維修方法,H,ow,to repair not electrify,網絡不良維修方法,How to repair network NG,.配件及配件接口不良,How to repair Fittings and connector NG.,復位信號動作過及與,clock,的關係,Relation of Reset signal and clock signal.,其它,Others,顯卡維修,VGA repairing,對於短路板如何維修,1.檢查主板的所有,AD,信號,包括（,CPU,座、,PCI、DIMM,槽、及,ISA,等）及其它的控制信號和時鐘蕊片各,時鐘輸出腳,.,所有的,I/O,接口信號其二極體是否正常。,/Check all AD signal on MB,including(CPU socket,PCI,DIMM slot and ISA,ect,.)other control signal and clock chip output pin,all IO connector signal and diode,see if they are OK.,2.,當被測信號二極體異常時,要根據其主板的架構,此信號所連接的零件,來快速而准確的判斷出某顆,零件不良,比如:,IDE,接口信號二極體異常,為南橋不良.,LPT,接口信號異常,為,I/O CHIP,不良.時鐘輸出腳二極 體異常,為時鐘蕊片不良。,When measured signal diode value is abnormal,according to MBs structure and connected parts of this signal,judge which part is NG quickly,Example:IDE connector signal abnormal,should SB NG,LPT connector signal abnormal,should I/O CHIP NG.Clock output Pin signal abnormal,clock chip NG.,CPU,電壓異常如何維修,1.,先查,CPU,電壓,電源管理芯片,及其,MOS,管,有無短路及燒壞現象,.,/First check CPU voltage,power manage chip,MOS,FET,see if there is short or burning phenomenon.,2.,查,VID0_VID4,信號電壓是否異常,.,/Check VID0_VID4 signal voltage is OK or NG.,3.,提供給電源管理芯片的,5,V,、,12V,電壓是否異常,.,Check Voltage(5V,12V)provided power manage chip is OK or NG.,4.,部分主板有,VID_GD,信號,查其是否異常,.,/,Some MB has a VID_GD signal,verify if,it is,OK,.,例,:,CPU,電壓過低,發現提供給,1164,芯片,(15,pin),12V,電壓異常查為供電電阻,10,歐不良,.,/Example:CPU voltage too low,after measuring,found voltage(12V)provided 1164 chip(15pin)is abnormal,resistance(10,)is NG.,音效不良維修方法,1.抓不住音效如何維修？,How to repair sound NG.,1.首先檢查24.5,M,晶振是否起振,如不起振再檢查供電5,V、3.3V,電壓是否正常,音效芯片的第1,pin.AC_RST,信號,3.3,V,電壓是否異常(注:某些主板在開機讀完內存才起振.),/First check whether crystal(24.5M)work,if not,check whether voltage(5V,3.3V)is normal,audio ship No.1 pin(AC_RST)signal is abnormal(PS:some MB,s crystal begin work after read memory),2.影響,AC-RST,信號異常的有五個信號(,AC_RST、C_BCLK、AC_SYNC、AC_SD10、AC_SD0).,這五個信號都是音效芯片與南橋相連，可通過測二極體的方法判斷。,/5 signals influencing AC-RST are AC_RST、C_BCLK、AC_SYNC、AC_SD10、AC_SD0,these 5 signals connect with SB,can be judged which is NG through measuring diode value.,3.當,AC_RST,信號正常,而24.5,M,晶振仍不起振,查晶振是否本體不良所連電容有無漏電及音效芯片本體不良.,/when AC_RST signal is OK,but crystal(24.5M)can,t work,you can check:,1.crystal self 2.connected capacitance 3.if,creepage,/leaking 4.audio chip,音效,TEST Fail,如何維修,How to repair audio test fail,1,檢查音效芯片周圍電容電壓,2.5,V,是否正常,如,2.5,V,電壓全被拉低,先檢查音效芯片,第,27,pin,的,VREF,信號電壓是否異常，如異常查與其相連的電容是否漏電。,Check whether capacitance voltage(2.5V)around audio chip is OK,if lower normal value,first need check audio chip,see whether twenty-seventh pin signal(VREF)is OK,if NG,then check whether related capacitance,creepage,.,2,音效測試,FAIL,一般有三項,:,Line in Test fail.CD in fail.MIC test fail.,通常是音效芯片至音效接口部分電路有異常,可排除南橋問題。,Audio test Fail,generally divide into 3 kinds:,Line in Test fail,.CD in fail.MIC test fail.Usually,there is problem on circuit between audio chip and audio connector,can,eliminate SB NG.,3,這三項都是從音效接口,通過一些電阻與偶和電容,輸入到音效芯片,根據測試,fail,結果去查,.,比如：,CD in fail,查,CD,接口到音效芯片之間有無異常,可參考線路圖。,These 3 items start from audio connector,via resistance and capacitance,input audio chip,you can check according to fail result.For example:CD in fail:you can check circuit between connector and audio chip have abnormity according to circuit diagram.,1,檢查從音效芯片輸出的,Line _out_L,Line_out_R,兩信號波形是否異常,此信號通過電容偶和，輸入到,TL072C（,功能芯片).經放大後,從音效接口,Line out,輸出,一般為,功放,芯片和音效芯片不良及電容漏電,.,Check whether Line _out _L,Line _out _R signal,waveform,is NG,these two signals through capacitance couple,input TL072C(functional chip),after enlarging,output from line out(Audio chip),generally,reason divide 3 kind:functional chip NG,audio chip NG,capacitance leaking.,2,若用耳機聽聲音正常,而用外置音箱有雜音,通常是,12,V,通過一個,0,歐或,3.3,歐電阻供給外置音箱,.,電壓異常,一般為供電電阻不良.,/,Sound is OK while,l,istening by earphone,but,have noise by external sound box,Usually it is 12 V which supply external sound box via one 0,or 3.3,resistance.The voltage is unusual,generally,is,the resistance NG.,有雜音如何維修,How to repair noise,1.首先要知道哪種機種的音效是六聲道,凡是音效芯片是,CMI9739A,就會用六聲道治具來測,/First need know definition of 6 channel:MB which have CM,I9739A need be test using 6 channel fixture.,2,確認,LPT,是否,OK./Verify whether LPT is OK.,Line in FAIL,查,Line out,和,Line in,線路是否有問題,可通過測試時量測此線路的波形來判斷,/check,whether,Line out,and,Line in,circuit,is,NG,usually by measuring waveform while testing.,FR,FL FAIL,查,Line-out R.L,線路和相關元件是否正常,/check whether,Line-out R.L circuit and related component is OK.,RR,RL FAIL,查,SROUT R,SROUT L,相關線路和元件是否正常,/check whether circuit(related SROUTR,SROUT L)and component is OK.,CENTER FAIL,查音,效芯片第,43,pin,之,CEN-OUT,信號相關線路,/check audio chip 43rd pin signal(,CEN-OUT,)and related circuit.,LFE FAIL,查音效芯片第,44,pin,之,BASS,信號相關線路,/check audio chip 44th pin(BASS)and related circuit.,六聲道維修,Repair Six channel,SPDIF I/O,查音效芯片第,47,pin,48pin,之,SPDIFO