DEAD MOBILE CHECK STEP-BY-STEP ✅️|DEAD MOBILE KO KAISE CHECK KARE | MOBILE REPAIRING COURSE

Описание: DEAD MOBILE CHECK STEP-BY-STEP ✅️|DEAD MOBILE KO KAISE CHECK KARE | MOBILE REPAIRING COURSE ‎⁨@htlogic⁩ 

All Mobile Set Dead Solution✅️

PMIC Buck Voltages⚡️Fluctuation
🔧DEAD MOBILE CHECK STEP-BY-STEP ✅️ | Mobile Repair Training Hindi


🧰 Tools Used:
Microscope

Multimeter

DC Power Supply

Rosin

Hot Air Gun

Jumper Wires

Tweezers

etc. Your Requirements

Technical Institute
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🔍 Step-by-Step Process:

1️⃣ Visual Inspection (Burn marks, corrosion, broken parts)
2️⃣ Battery & Connector Check
3️⃣ Check Charging Path
4️⃣ Check Main Power Line (VBAT → PMIC)
5️⃣ PMIC Output Buck Voltage Test
6️⃣ CPU, eMMC & XO Check
7️⃣ Shorting Test with Rosin + DC Supply
8️⃣ Reball/Replace Faulty Components


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⚠️ Common Causes of Dead Mobile:

Water damage

Shorted capacitor or IC

Faulty PMIC

eMMC failure

CPU short

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Mobile Repairing Students

Professional Technicians

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🔧 PMIC BUCK Voltage Fluctuation – Causes, Diagnosis & Solution

📌 What is PMIC BUCK? PMIC (Power Management IC) Buck converters are step-down voltage regulators used to supply stable power (like 1.8V, 1.2V, etc.) to mobile phone CPU, RAM, display, etc.

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⚠️ Symptoms of BUCK Voltage Fluctuation:

Phone dead or restarting

CPU heating

Display not working

Boot loop

Voltage jumps (e.g., 1.2V → 0.85V → 0V intermittently)



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🔍 Common Causes:

1. Short Circuit on Output Line

Capacitor, filter coil, or IC drawing excess current.



2. Corrupt or Damaged PMIC

Internal switching fault inside PMIC.



3. Leakage or Partial Short

High resistance short not easily detected with normal continuity.



4. Faulty Load Component

CPU, RAM, eMMC pulling unstable current.

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🛠️ How to Diagnose (without thermal cam):

Tools Needed: Multimeter, DC Power Supply, Rosin/IPA, Hot Air Gun (optional)

1. Check Voltage Stability

Power the board with DC Supply.

Probe BUCK lines like VREG_L1, VREG_L2, S1_1P2, etc.

If they fluctuate (e.g., 0.5V → 1.2V → 0V), suspect short or overload.


2. Check Resistance (Multimeter)

Phone OFF, measure resistance between BUCK line and GND.

If below 50–499Ω, investigate that line.



3. Use Rosin (without thermal cam)

Apply Rosin Pcb ( motherboard )suspected area.

Give DC power → observe smoke/evaporation to spot faulty part.


4. Check Line Current on DC Supply

If current spikes then drops, PMIC is restarting → trace short.
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✅ Solution Steps:

Fault Type Solution

Shorted Cap Remove or replace capacitor
Faulty Coil Replace filter coil
Dead PMIC Reball or Replace PMIC
CPU Short Try low-heat reflow or check for CPU replacement
Software Issue Flash correct firmware or bootloader

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