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Case study #02 Sony MBX-223 Problem : No power on Firstly I disassembled the board and do physical check found corrosion, dust, I removed all corrosion and rust from the board. Now I put dc jack ampere is 0.010 but the board is not triggering and after some time ampere drops to 0.005,but S.B voltages generating on 0.010ampere and droping at 0.005ampere .. Now I think of Bios, I did so many bioses for EC and PCH, But no results.... Now I think of checking IO requirements, while checking IO requirements I found that SUS ON is not present on IO, so i back traced for slp_s4, slp_s5 found that all were absent, but s.b voltages are coming and going back, I changed the Filtering capacitors also.. Now finnaly i got a clue from S.B ic that always power good going to IO from S.B ic is missing on IO.. So i came to S.B IC found that one pull up voltage is present on resistor to give always power good to IO, that resistor was faulty, I replaced with new one case solved.... Thank you Rafi sir and supporting grp members for giving me courage to solve this kind of problems... 😊

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My first case study after attending practical workshop Acer AN515-42-R6GV PROBLEM NO DISPLAY FIRST STEP ---- CONECT DC JACK DC READING : 002 PRESS PWR BTN AFTER DC REDING 0.250 TO 0.300 OPEN LAPTOP AND CLEAN MOTHERBOARD AND CHEK PHYSICAL CONDITION GOOD SECOND STEP ----- CHEK ALL COIL IMPEDANCE IMPEDANCE IS GOOD ALL COIL THIRD STEP ---- PLUGIN DC AND PWR BTN PRESS AGAIN AMP. 0.250 CHEK ALL COIL VOLTAGE 3.3 v,5 v,1.8 v,0.9 v is genrate But gfx and core voltage not genrate This board problem state in "S3" FORTH STEP --- CHEK DC TO DC IC 3v/5v DC TO DC OK 3v/1.8v DC TO DC NOT OK AGAIN BACK TRACE ENABLE ENABLE IN VR_ON IS NOT COMMING AGAIN BACK TRACE VR_ON IS COMMING BY IO AGAIN CHEK "PWR SECQVENCE" IN PWR SECQVENCE 0.9V ALW TO SUSPEND COMPLETE AFTER GENRATE VR_ON FIFTH STEP ---- AGAIN CHEK 0.9v DC TO DC MOSFET FOUND "U4" DRAIN INPUT 0.9V AND CHEK ON SOURCE OUTPUT NO VOLTAGE CONVERT AGAIN CHEK GATE VOLTEGE NO ANY VOLTAGE. CHEK IMPEDANCE 0.900 IMPEDANCE IS OK AGAIN REMOVE MOSFET AND REPET UPPER PROCESS AND CHEK GATE VOLTAGE NO ANY VOLTAGE AGAIN BACK TRACE FOUND "R1674 AND Q84" CHEK Q84 IS OK AND CHEK R1674 IS INPUT SIDE 5V AND OUTPUT SIDE NO VOLTAGE CHANGE R1674 4.7K TO 4.7K SAME RAGISTER AND AGAIN CHEK INPUT OK AND OUTPUT 2.6 V I AM NOT SATISFIED AGAIN CHEK C16 VALUE IS GOOD BUT I THINK WHAT'S PROBLEM I DECIDED REMOVE C16 AND CHEK MY PROBLEM IS SHORTOUT GATE VOLTAGE IS GENRATE AGAIN PUT U4 MOSFET AND AGAIN RECHEK NEW DC REDING IS 0.560 BUT DISPLAY IS NOT COMMING MY MISSION IS INCOMPLETE SIX STEP 🪜🪜🪜🪜🪜 I DECIDED MAKE A NEW BIOS AND FLASH BIOS AND FIX BIOS CHIP AND RECHEK AGAIN MY NEW DC REDING IS 0.987 - 0.700 - 1.150 - 1.300 - 1.500 AND DISPLAY IS COMMING MY MISSION IS COMPLETE I AM HAPPY 😊😊😊😊 THANK RAFI SIR AND ALL AFS FAMILIES MEMBERS "KISI KA KNOWLEDGE KABHI WEST NAHI HOTA,ISLIYE KHUB MEHNAT KARO MY DEAR FRIEND'S,AUR IMANDARI SE COMPLETE DVD DEKHO MINIMAM 5 TIME AND PRACTICAL WORKSHOP ATTEND KARO FIR DEKHO KAMAL APNE HUNAR KA,APKA APNA HUNAR AUR RESPECTED RAFI SIR KA ASHIRWAD MIL JAYE TO KOI BHI BOARD JISKA CHIPSET OK HO USKI AMMA KI KASAM BOARD ZINDA HOKAR RAHEGA.

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