Case study

Dell n5010
Board statush : dead
1st step---
Connect dc Jack and chek 0.30 mili second.
Direct 5.012
Iska matlab board full short.

2nd step---
Open laptop and clean motherboard,and I watch allredy another engineer work this board in sb section.

3rt step ----
Chek all section impidance
Clr-0.046
Pl4601-0.000
Pl4602-0.000
Pl4901-0.000
Pl4701-0.007
Pl4702-0.007
Pl4703-0.007
Pl5301-0.006
Pl5001-0.008
Bios pin no.8-0.000
Pch cap - 0.003(1.8v)
2nd cap - 0.000(3.3v)

4th step --
I thought this board is fully short,it's non repairable board.
But again thoth is board se kuchh sikhte hai.

5th step--
Remove sb section both coile
And chek impidance
Pl4601(input/output)-0.00/0.00
Pl4602 (input/output)-0.147/0.00

6th --
Again chek clr-0.168
I decide inject voltage 2.3v in sb section output

Pl4601 on inject voltage in output section and I found u701 ic is hitting...
I will remove this ic and chek output impedance....
Pl4601 output impedance is good 0.367,I'm happy 3v section jinda ho gaya,but 3v ldo still short, I think who section is fully.again some time thinking and I decided standby ic remove and again chek 3.3v ldo section is ok.i am very very happy ki mera pch bhi ok hai.
But 5v section still shorting.

7th step --
Inject 3.3v on pl4602 output section and chek any clue, after inject 5sec voltage I found pu5001 ic is very very hitting, agin remove this ic and again chek impidance pl4602 output section is good impedance5 0.325.

8th step--
Again chek all section impidance
All section impidance is good,and clr impidance is also good 0.457.

9th step---
All new ic fix in motherboard,and chek impidance all section, all section impidance is good,and connect dc and chek 0.30 mili sec 0.026,0.017,0.008....

10th step --
Finally given 19.0v by dc.
My board is on and amp.0.008,0.360,0.0758,0.950 and display is came on my pendrive.......
And I am very happy .......
And diliver laptop to deler.....
And deler is also very happy and thankfully.

Thank md.rafi sir,sir agar aap hame na milte to ham bhi aur engineer ki tarah Puri india ghumte,aur koi sahi rasta dikhane wala nahi milta.

I'm very very thanks to md.rafi sir and all afs family members.....

💥Case study 16
💥Samsung Rv411
💥Problem No Display,
💥Dc Reading in 30 mili second 12 30 15
💥 when laptop on dc Reading go to 3000 mile amp in battery mode,
💥 without battery 1700 mili amp
💥but one imp points is mujhe burning smell aa arhi thi .
💥 then open laptop I check where is burning, I found near CPU core section one MOSFET is burn.
💥then I check MOSFET is short.
💥 I replace MOSFET ,and I check every coil impedance is okey
💥I connect dc jack reading is go to 6 means board ok.
💥but when I trigger mother board amp reading gos to 750 ,1200,1500,then dc Reading showing short and board is off,
Try to second time conditions is same reading go 750 ,1200,1500, and short and mother board is off.
💥 phir sir Rafi sir ke Dell mother board ka video ki baat yaad aai،
Jab bhi core section ka MOSFET ude ga tab tab core ic bhi change karna
💥then change ic and re triger board dc Reading gos to 750 1200, 1500, 1750, 1900, and1950 and display come alhamdulillah.
💥 thanks Rafi Sir

BIOS DVD Magic 🪄✨
ACER DAZAAMB16E0 REV E
NO DISPLAY
FAN SPEED HIGH
DC READING 42,33, 13,5
CLUE IS BIOS CORRUPTED
💥 ANOTHER ENGINEER TRY BUT FAIL
🤗 THEN I TRY TO SOLVE
I AM TAKING ORIGINAL BIOS FROM PREVIOUS ENGINEER
🤗 ALREADY HE WAS WRITING BIOS
🤗 SO I DECIDED TO COMPARE BOTH BIOS
🤗 I SAW THAT BOTH BIOS R DIFFERENCE CSE ME ORGINAL IS 11.5.0.1003 AND HE WAS WRITING LOWER VERSION OF CSE ME 11.0...
🤗 SO I DECIDED TO UPDATE ORIGINAL BIOS WITH FITC TOOLS.
🤗 I JUST UPDATED INTO 11.5.50.3000 MAY BE
🤗 POWER ON BUT FAN SPEED HIGH 🤣 AND NO DISPLAY
🤗 I JUST WASH SOC WITH ISOPROPYL AND HEAT IN OVEN 10MINTS
🤗 MOTHERBOARD COOLING WITH HIGH SPEED FAN
🤣 PUT THE DC METER AUTO POWER ON
💥 AFTER RESTART DISPLAY BOOM💥💥💥📱
ALHAMDULILLAH
I AM SO MUCH THANKS FULL TO RAFI SIR FOR HIM MAGICAL BIOS DVD.

💥 CD3301 IC BYPASS DATA FEEDBACK