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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 🙏🙏🙏

💥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💥💥💥

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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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Watch "How to Use Professional Ultrasonic Machine for Laptop Chip level Repair" on YouTube
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