DEAD MOBILE CHECK STEP-BY-STEP ✅️|DEAD MOBILE KO KAISE CHECK KARE | MOBILE REPAIRING COURSE
Автор: HT LOGIC
Загружено: 2025-07-12
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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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🔧 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.
🔥🔥🔥🔥🔥🔥🔥🪄⚙️⚙️⚙️⚙️⚙️✅️
🛠️ 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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