Yuav ua li cas siv ib tug multimeter rau kev ntsuam xyuas ntawm nco chips
Muaj 64 tus pin cov ntaub ntawv ntawm lub motherboard thiab nco, D0-D63. Txhawm rau tiv thaiv cov ntaub ntawv pins ntawm lub cim xeeb, tus resistor (10 ohms) nrog tus nqi sib txawv yog ntxiv rau tag nrho 64 cov ntaub ntawv pins ntawm D0-D63 kom txwv qhov tam sim no. Lub hauv paus ntsiab lus tseem ceeb ntawm tus tester yog rov sim dua txhua cov ntaub ntawv tus pin ntawm lub cim xeeb nti nrog ib qho kev pab cuam kom pom tias muaj cov ntaub ntawv tawg lossis luv luv Circuit Court me ntsis pins, nrog rau lub moos pin thiab chaw nyob tus pin ntawm lub nti.
Yog li thaum siv multimeter los ntsuas lub nti, tus ntsuas kuj tuaj yeem siv los ntsuas nws. Ntev npaum li tus cwj mem liab txuas nrog hauv av (1 tus pin) thiab tus cwj mem dub yog siv los ntsuas qhov tsis kam ntawm qhov tsis zoo, nws yog tus nqi tsis kam ntawm lub cim xeeb nti cov ntaub ntawv me ntsis los txiav txim seb lub nti twg yog qhov txhaum. Feem ntau, tus nqi tsis kam ntawm txhua cov ntaub ntawv me ntsis yog tib yam. Tab sis nws tseem tsis tau paub zoo li tus neeg sim, thiab txoj kev no tuaj yeem ntsuas qhov zoo ntawm DDR nco chips.
Raws li cov neeg siv phau ntawv, qhov ntsuas ntsuas yog 2A thiab 2B, uas txhais tau tias ib pab pawg thiab ob pawg. Tab sis muaj 8 16 me ntsis chips, uas yog sib npaug rau ob teev, thiab 16 8- ntsis chips kuj sib npaug rau ob teev.
2A yog thawj pawg, thiab 2B yog pawg thib ob.
Thaum ntsuas, cov ntaub ntawv tus pins ntawm txhua lub nti hauv txhua pab pawg yuav raug kuaj cyclically. Nws yog feem ntau zoo yog tias nws tau sim 3-5 zaug yam tsis muaj kev puas tsuaj. Ib lub chip zoo yog PASS. Ib tug faulty nti qhia faulty cov ntaub ntawv me ntsis pins.
1. Tsis tuaj yeem ua qhov kev sim pib dhia, feem ntau suav nrog chip luv Circuit Court thiab PCB board luv Circuit Court. Qhov kev daws teeb meem yog tshem tawm cov nti thiab hloov nws nrog lub rooj tsav xwm PCB zoo los kuaj xyuas qhov zoo ntawm cov nti thiab pom tias qhov teeb meem yog dab tsi.
2. Lub cim xeeb tester tsis kuaj SPD chips, SPD chips yog xaiv tau
3. Yog tias tus ntiv tes kub kub, nws tsis tuaj yeem kuaj. Lub nti yuav tsum tau muab tshem tawm thiab hloov nrog lub rooj tsav xwm PCB zoo los kuaj nws qhov zoo
