Clamp meter los txiav txim siab txoj hlua LED teeb ua haujlwm tsis raug
Tom qab rov sim dua, pom tias lub ntsuas ntsuas clamp tuaj yeem txiav txim siab txoj hlua LED ua txhaum, txoj kev ua haujlwm tshwj xeeb yog raws li hauv qab no:
Thawj kauj ruam: raws li cov hlua LED ntawm cov xov hlau los txiav txim seb muaj pes tsawg pawg ntawm LEDs hauv qhov screen nrog +, - kab. Piv txwv li: ib tug 39-inch LED LCD TV LED txoj hlua ntawm cov kab kos duab, los ntawm cov kab hluav taws xob daim ntawv lo thiab kev sib raug zoo, lub tshuab tshuaj ntsuam muaj 5 pawg ntawm cov hlua LED, thiab cim "+" cov kab sib txuas nrog cov hlua LED ntawm kev sib txuas zoo, uas yog, feem ntau hu ua LED + kab; thiab sau tias "-" cov kab sib txuas nrog cov hlua tsis zoo LED txuas nrog rau kab, uas yog, feem ntau hu ua LED - kab.
Kauj ruam 2: Ua ntej, tso lub ntsuas ntsuas ntawm qhov tsawg kawg nkaus ntawm DC tam sim no, thiab tom qab ntawd snap lub ntsuas ntsuas ntawm LED + lossis LED- kab ntawm txoj hlua LED.
Kauj Ruam 3: Fais fab thib ob tom qab lub hwj chim qhib, saib xyuas lub ntsuas ntsuas lub ntsuas hluav taws xob thaum lub sijhawm fais fab. Yog tias lub tshuab faulty muaj ntau tshaj li ib pawg ntawm cov hlua LED, nws yuav tsum tau hloov ntawm lub tshuab ob peb zaug los ntsuas txhua pab pawg ntawm cov hlua, thiab sau cov ntawv nyeem tam sim no ntawm txhua pawg ntawm cov hlua.
Yog hais tias ib pawg ntawm cov kev nyeem ntawv tam sim no thiab lwm pab pawg uas muaj qhov sib txawv loj (qhov tshwm sim tsis ua haujlwm feem ntau yog lub teeb rov qab uas tau tawm), tom qab ntawd xyuas cov pab pawg ntawm cov hlua teeb ntawm cov xov hlau, plugs, qhov (socket) thiab LED - qhov kawg ntawm lub peripheral circuitry yog txawv txav, yog tias ib txwm muaj, nws tuaj yeem txiav txim siab tias pawg ntawm cov hlua teeb muaj teeb meem; yog tias cov pab pawg ntawm cov hlua teeb ntawm kev nyeem ntawv tam sim no zoo sib xws, thiab deb tsawg dua li cov nqi ib txwm muaj (qhov tsis ua haujlwm ntawm qhov tshwm sim feem ntau yog lub vijtsam dub), nws qhia tau hais tias lub backlight tsav Circuit Court yog txawv txav.
Yog hais tias qhov tsis ua hauj lwm ntawm lub vijtsam yog txiav txim siab los ntawm ib pab pawg ntawm LED txoj hlua txawv txav, ces koj tuaj yeem disassemble lub LCD npo, nrhiav cov pab pawg ntawm cov hlua, nrog lub clamp meter (los yog digital.multimeter ) diodethaiv los ntsuas cov pab pawg ntawm cov hlua ntawm txhua qhov LED ntawm ob qhov kawg ntawm kev poob qis rau pem hauv ntej. Thaum zoo li qub, ntsuas LED teeb hlaws yuav tawm lub teeb ci ntsa iab, thiab qhov hluav taws xob rau pem hauv ntej ntawm txhua lub teeb hlaws tsis txawv ntau. Yog hais tias lub pem hauv ntej voltage poob ntawm lub teeb hlaws thiab lwm yam loj sib txawv, nws qhia tau hais tias lub teeb hlaws yog phem.
