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Watch "Dell 1440 Alba 08265 || Chak de Fatte Case Study || Part-2" on YouTube https://youtu.be/0UwH6bNjaW4

💥 Case study by Prince

💥case study laptop dell 3521 la-9104p problem dead. 💥return from other repair service centre. 💥 plug dc reading is 0.000. Open laptop check all coil value okay cpu coil is 0.001 means have chance. 💥 observe the motherboard find the first mosfet was miss i check gate voltage there is 19v thats not good. Put jumper on first mosfet and 2 mosfet and put ram ic in wrong position. I correct it. 💥now my reeding is 0.006 trigger motherboard goes 0.0012 come back. Now i change 3v & 5v output cap with 330. Before trigger board. 💥 I check 3v & 5v valve now my 5v line short. give 2.4 voltage on it and check heat my ram ic was heat i check ram ic vcc its low value removed ic shorting gone. 💥 Now i replaced ic and value good plug dc reeding 0.007 press power button reeding goes to 0.017 then back again. 💥 I don’t have 3v 5v on coil it’s always voltage then I check check entrip pins no voltage. For testing I remove PQ206 my 3v 5v ready dc reeding is 0.0011 press power button reeding same is .17 and back. Now i trace back EC_ON i don’t have EC_ON voltage. 💥 I note when i press power button and reed goes to 0.0017 that time is i have EC_On & when its back my EC_on 0v. I think i/o problem put new i/o program its with RT809F. 💥 After program i/o same condition. I was too confuse then i thought let’s fix 19v section i remove jumper put mosfet. and check both gate voltage there id 19v on gate its P channel mosfet i trace back gate there is one game changer PQ114 there is no ACIN on its gate. 💥Now i trace ACIN and i check charger ic requirements dc in goes in side but ic nothing come out then ic carefully the charger ic is wrong number 🤯 before change ic i put 3v coms on ACIN my 1st 2nd mosfet gate voltage is 8v that’s good 😌 put new charger ic. 💥Now my dc reeding is 0.005 now i have EC_On 3v and 3v and 5v always. Why i don’t have because my ACIN is goes in side of i/o then i/o put out EC_on 💥 i press power button reed goes 0.137 all voltage okay but no cpu core voltage check core ic requirements all okay but no core voltage now i check uz1 and qc3 one side i have 1.5v voltage other no voltage check both gate 0v there B+_Bias track is miss and RZ18 also mis. 💥 Now i arrange RZ18 its 470k it’s very hard to find. Makes same track and now my voltage was pass and also have core voltage and i also flash bios. 💥 Now press power button reading goes to 0.600 , 500, 400 and 3 time restart. dell 3521 u don’t have display without screen older Engineer also damage screen and cable also. 💥💥💥Its very hard and challenging form to repair this kind of motherboard. It’s possible because of I’m AFS Solution student. 💥💥Thanks to MD. Rafi make us that level engineer. Thanks to give that confidence cpu jinda reha to ess ki amma ki kasam ye display deyga💥💥💥💥

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Case study challenge 43/100 📌 Dell n5010 laptop comes in no display issue. 📌 chl with dc supply amp goes to 1.132 but and gives patanjali 7 beep. 📌 problem of graphics section 📌 now start to convert with the help of Respected Rafi sir video. 📌 whole conversion done successfully now assemble laptop and chk display but board gave only external display no internal display. 📌 now chk with only board and screen same issue 📌 chk for any components dry aur not solder properly but not found everything was ok. Try 10k instead of 1m resistor but same, try 2-3 25mhz crystal but again same issue. 📌 after ½ hour I thought about lcd-vdd. Chk that and problem found no lcd-vdd generate 📌 remove 6 leg j-fet and jumper on pin no. 4 to 5 and alhamdulillah. Display was perfect on screen. 📌 Thanks to Respected Rafi sir to teach us how to work with patience. Love you sir 🥰🥰🥰

Case study challenge 42/100 📌 Dell 3521 (la-9104p) laptop comes in no display issue 📌 chk with dc supply amp goes to 0.200 and display. 📌 now chk voltages 3v, 5v, 1.5v all ok 📌 now turn to chk vs voltage. 3v, 5vok but 1.5v missing chk on mosfet 1.5v input ok but no output. No voltage on gate. (B+_bias) 📌Now chk gate track on gate only 1.5v is coming but on this track there b+_bias coming through resistor. On resistor at one end voltage ok but another end only 1.5v. 📌 now I removed mosfet and gate voltage generted properly. Change mosfet and alhamdulillah 1.5vs is generate. 📌 aur ab Rafi sir dua se display aa gaya 📌 Thanks to our schema guru Md. Rafi sir who teach us how to follow power rail. Love you sir lot 🥰🥰🥰

Case Study 01/100 Lenovo Laptop Came for not power on with battery , Working fine with Adopter . Without being asked customer told b4 this issue his laptop was dead n he gave for repair 2 sm othr technician n after service the technician told him that it will work with adopter only n was charged 1500 Took the challenge n approval of rs1000 for the job 2b done The earlier technician alrdy chngd charging ic mosfets etc not interested to trace d same directly As usual following Resp Guruji's lesson keeping things simple n stupid started from battery connector Smdata smclk tmp ok No shorting on batt+ In the 4th minute got the clue as there wasn't any contact btwn btry connector +ve and charging coil Found the culprit in btwn "Fuse" Simply put jumper fuse n confirm case done , after testing put jumper hidden below physical fuse to keep worth n justify job done (sharing pics below) Always AFS DVD n lessons we learn from Resp Rafi Sir Comes into act n gives Result n Success 🙏🙏🙏