Case study
Dell cedar 13269-1
Problem - without adaptor , plugged in charging
👉 First check vin and charging section impedance - all ok
👉 Check value of all MOSFETs of both sections - all good
👉 Connect battery and check PU4402 - it passes the battery voltage ( 2nd mosfet should be block the battery voltage )
👉 Check PU4402 gate , it's 1.2v
With battery this gate should be 13v
👉 Back trace to PQ4402 pin no 2 - its high logic ( here should be low logic in battery mode )
👉 Back trace pwr_chg_acok and found PQ4408
PQ4408 pin no 5 gate is low logic ( in battery mode it should be high logic )
👉 This pin (AC_IN#) connects to the charging ic pin no 5 ACOK#
👉 I just remove PQ4408 and check pin no 5 - now its high logic
👉 Replace PQ4408 from scrap board
💥 BOOM
now PQ4408 pin no 5 gate is high in battery mode and low in adaptor mode,
Check PU4402 mosfet gate - now gate is 13v
Problem solved
Thanks to Rafi guruji and the AFS dvd 🙏

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Case study
Dell 3593
Board part number : LA-J081P
PROBLEM : NO DISPLAY
First connect dc jack and presh pwr btn and laptop on but amp 0.3.. but display not coming and power led glow 🌟 3 time orange 5 time white
Flash both bios
But problem not solve same condition
Again chek dc to dc conversation all dc to dc ok
Again cheking near PU2501 IC ONE CAPS short i remove cap but short not gone
Again check output
Output short
Again dc voltage set 2.5v and give voltage on output and chek
Found one caps short output section
Remove cap and chek short remove
Again plugins Dc triger board
Amp. 0.2.. ,0.3..,0.400,0.600......
Again restart and amp 0.367 to 0.380
And power light bilnking change new blinking 3 time orange 1 time white
Minss... Battry connect for display
Laptop me board ko fix karke battry connect Kiya fir board triger kiya agin no display but blink code same 3 time orange 1 time white
Press pwr btn and fource shutdown
Again press pwr btn board on and autorestart 2 time and 3rt time restart booom ...... display is comming


Mai khush huwa ki meri mehnat bekar nahi gayi work done.

Thanks md.rafi sir

"Apke aashirwad se mai aaj ek letest genration laptop ready kar diya"

Again thanks rafi sir and all afs family


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