Case Study-48
LA-7912P
PROBLEM Dead
Dc Reading 0.004
Open laptop check all coil
impadance is ok
3v and 5v standby ok
Q26 is Damage then i replace it its n channel dual 6leg MOSFET
Now check
Now Dc Reading is 0.100 and when i trigger the board Board is power on and get the display
But this reading is not ok
Then check it backtrace
Susp is not coming on
Q26 pin number 5
Using boardview i found the track was internally damage then i jumper from R246
And also i found
Q6 p-channel B+ 19V is available Gate +5v available but no voltage on Source
I removed and put jumper for testing purpose now Dc Reading is 0.007 replace it from scrap
Dc Reading is 0.007 trigger the board
Alhamdulillah Now Board is Working Fine Thank You AFS Solution Banglore Love you Md.Rafi Sir ❤️

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Dell inspiron 15 3567 laptop board part no. as mentioned in image attached , came for power onn no display issue (3 amber 3white blinking), opened unit chkd cmos btry voltage 2.9v replace with new same status , rmvd cmos btry n power on now fan spinning high speed , all coil voltage ok except cpu core & gfx core , got clue of bios corruption , as I hvn't practiced bios creation took original bios dump n shared in AFS telegram grp with Service tag , rcvd bios files from AFS brothers Jose Philip bhai and Arif bhai, flash bios with the 1st file rcvd , power onn laptop after 3auto shut dwn display ok , powrd off rmv bios chip flash with 2nd file rcvd , powrd on agn 3auto shtdwn n display ok , problem solvd .
as both the brothers gave der precious time to help me , I used both the bios for testing n solving the case .
Thanks a lot AFS brother Jose Philip & Arif Bhai for kind support
Thank u so much respected Rafi sir for teaching n sharing quality knowledge with us by which we proudly earn our bread & butter 🙏🙏