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🍁Today Case Study Hp 🍁Part No. La-D711P 🍁Open Laptop 1st Check phisicaly and corrosion 🍁Nothing Found Connect with DC supply 🍁DC reading is 0.186 means shorting in MB 🍁Check Coil Impidance Found 3volt Coil Impidance Low 🍁First Open Jumper pad (PJ3) 🍁Check Impidance output side ok input side short 🍁Remove Standby ic (PU8) 8A 🍁After remove Impidance ok 🍁Replace 8A Standby ic with new 🍁After replace Connect with DC supply DC showing again short same reading 🍁But 3volt coil Impidance is ok 🍁Check Ic Impidance found VREG3 pin no.15 showing short again remove stand by ic 🍁Inject 1.5 volt on VREG3 pin 🍁io getting heat Remove io Kb9022 Programmable 🍁Now check Impidance pin no.15 showing good 🍁Put back Standby ic in motherboard 🍁Connect with DC supply without io check standby ic VREG3 and VREG5 is ok 🍁Now Replace old io with new fresh io 🍁Now connect with DC supply DC reading 0.001 🍁Check standby after Change io Vreg3 showing 0volt 🍁Again Remove one Jumper pad PJ4 🍁Now check with multimeter Vreg3 volt ok 🍁Remove io and put jumper back (PJ4) 🍁Vreg3 is ok it means my new io is also foulty 🍁Now i put io from scrap board 🍁Connect with DC supply DC reading 0.011😇 🍁Now connect with Programmer and program io 🍁after program triggered mb 🍁MB power on but no display DC reading is 200 🍁Back trace Check dc/dc circuit found U20 Dc ic 🍁Check this ic requirement all ok but 5volt not cross 🍁I don't have this ic remove ic and put jumper for testing purpose 🍁 Triggered mb finaly display come🥰🥰🥰 🍁35 out 100 🍁You have inspired me to go places that I never thought I would ever reach. Now I believe with hard work and dedication everything is possible. Thank you Rafi Sir Love u and God Bless u.

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💥Case Study hp laptop, part number LA-C811P comes with in dead and liquid damage. 💥I open laptop find rust and & corrosion near core ic and charger ic. 💥Clean full motherboard and check any shorting. All good 💥Plug dc reeding goes to 0.0011 press power button laptop turn on and give display. 💥again i plug dc same reeding at that same time I connect battery also now reeding goes 11, 15, 0.007 back 11 💥for testing purpose I connect only battery and turn on laptop, laptop was turn on and give display now I connected dc now reeding 0.000. Removed battery also same. First fet not switch. 💥 first mosfet 0v on gate, remove discharging most same condition replaced first mosfet still same now i check charger ic requirement. 💥first vin for charger i have 3.48V back trace it found one resistor PRB6 10 ohm, one side 20v other side 3.48v check value showing value in Kilo ohm. I replaced that’s resistor now reeding back to 0.0011. 💥 Now i put back first mosfet laptop working fine and i put new discharging mosfet PQB13. Now connected battery and charger at same time and now battery also charging and laptop work fine. 💥💥💥Thanks to md Rafi Sir gives us 30 millisecond Technology💥💥💥

Case study Dell 3521 (LA-9104P) Fault - sometime on, display comes then shutdown within 1 minute and some time didn't on *Clue* - dc reading sometime 0.005 and sometime 0.003 👉 Clean the board 👉 Vin ok, 3/5v ok 👉 Check 3/5v output by DSO, there is little disturbance 👉 Replace output capacitor, now clear but problem not solved 👉 Check on/off switch - 2.3v and sometime 2.9v 👉 check impedance on Dc-Dc mosfets, output ok but input very low with buzzer 👉 Check LDO voltage, 5v ok but 3.3v not proper 👉 Apply flux and just resold all pins 💥 Boom Problem solved Display good and board continues on Think simple and stupid 🙏🙏🙏

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