HP DV4 White Screen Problem

📌 Product: – HP DV 4
🤔 Problem: – Laptop Display is White.
🛠 Faulty Product : – LED Screen.
🔍 💊💉 Diagnosis & Solutions: –Check and found display become white after some time . 1st check all requirement of LVDS found ok.  Cross check with Working LED and LVDS Cable and confirm that LED Screen is faulty so 1st think LED inbuilt BIOS problem but during checking found BIOS is ok and LED Boosting IC become very hot after some time so check near by all passive and active components for short no short found nearby the IC so directly replace the boosting IC. Problem Solve case done.

White Screen

Faulty IC

Problem Solve

IC Changed

Dell Laptop 5520 Multi Problems

📌 Product: – Laptop Dell Inspiron 5520
🤔 Problem: – No Power and connection Adopter Light of Adopter goes off(19 V Short).
🛠 Motherboard P/N: – LA-82413
🔍 💊💉 Diagnosis & Solutions: –

Check and found one pf short in 19V Line remove this 19 Volt problem solve but 3/5 not generating.

Customer was to busy and he bring it to my home for repair next day he has a presentation in office. So I need quick solution . For schematic ask on SK Bhashir Sir Telegram paid group sir provide quick support. Then I started my diagnosis for 3/5 IC requirement all are ok only en-trip is not tiger so check ENTRIP origin found Q201 controlling this ENTRIP and  it’s base not get any voltage whether customer have no time so I remove it and short Pin 1 with 3 ENTRIP generated 3/5 OK .

After providing NBSWON Laptop Started and in USB/Keyboard get LED Blink  so as theoretically display is generated.

But after connecting Display there DIM display issue. so again check for LVDS requirements fond DISPOFF have no voltage so again not put jumper from 3VS to this section. Display back-light come . I have provide it to customer he is happy problem resolved.

**Only Jumper Work done due to customer have not time but I suggest every one find why this signal and voltage not come to actual location and solve . Jumper solution is only quick remedy not permanent solution .

Laptop :- HP Pavilion g6 (DA0R13MB6E1)
Problem :- No Display.
Diagnosis :- Run With DC Power Suply. Found Amp Rating is 1.30amp. So 1st dry sholder the board(Same Probelm) . Then Programe both Bios Display come but with in 30 sec. again no display. Then Replace the Main BIOS ic and programe it. Problem Solved.

📌 Product: – Laptop Acer Aspire One D257
🤔 Problem: – Some time power on some time not power on.
🛠 Motherboard P/N: – DAOZE6MB6E0
🔍 Diagnosis: – Checks and found one bipolar transistor in thermal protection section getting excess heat.
💊💉 Action done: – Replace this transistor. Problem resolved.

Make Model :- Acer 4750
Problem :- Internal Keyboard Ctrl Key not working.
Diagnosis :- Check and found I/O pin track
out form Keyboard Connector Pin .
Solution :- Provide Jumper form I/O pin 50 to Keyboard Connector Pin no 4 . Problem Solved.

Model :- Dell 3521
Problem :- Some time Charging then some time not work.

👨‍💻 Diagnosis :- Check and found rust in charging section clean it then in cold test found 2nd mosfet short replaced but new mosfet heating So check in hot mode found ACOK voltage not stable so replace Charging IC problem resolved.