What is VBUS, VBAT, and VPH Line in Mobile Phones? | Explained in Hindi | Mobile Repairing Basics

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Are you a mobile repairing student or technician who wants to understand the core power supply lines in smartphones like VBUS, VBAT, and VPH? Then this detailed and simplified video is just for you!

In today’s video, we’ll break down the meaning, purpose, and function of these three essential power lines in mobile phones. Understanding these is crucial for any hardware-level repair, especially when dealing with charging issues, dead phones, no power problems, or battery-related faults.

🔍 What You’ll Learn in This Video:
✅ VBUS Line – What is it and where does it come from?
✅ VBAT Line – How it powers the phone and connects to the battery.
✅ VPH Line – Why it's called the phone's “life line”.
✅ Difference between VBUS, VBAT & VPH
✅ How to identify them on a mobile schematic diagram.
✅ How to test these lines with a multimeter.
✅ Real circuit examples from popular phones (iPhone & Android)
✅ Common faults associated with these lines – like shorting, open lines, overvoltage, etc.
✅ Live Class Explanation with visual circuit diagrams and tips.
✅ Pro tips from expert faculty on repairing these lines.

🔌 What is VBUS?
VBUS is the Voltage Bus line.

It is the power supply line that comes from the USB charging port.

Generally carries 5V when the charger is connected.

This line goes to charging ICs and starts the power process.

If VBUS is not working, the phone won’t detect charger at all.

🔧 Real-life Issue Example:
If a phone is not charging or not showing the charger sign, VBUS might be broken or shorted.

🔋 What is VBAT?
VBAT stands for Battery Voltage.

It comes directly from the battery and supplies power to multiple ICs on the motherboard.

Typically ranges from 3.7V to 4.2V depending on battery level.

All major ICs like CPU, Power IC, Charging IC, etc. depend on VBAT.

🛠 Tip:
Always check VBAT continuity from battery connector to Power IC if the phone is dead.

⚡ What is VPH?
VPH means Voltage Phone High, or also called Phone High Line.

It is a filtered and regulated line generated from VBAT or PMIC.

Supplies stable power to modem, CPU, RF section, etc.

Acts like a backbone for overall phone operation.

🧠 Interesting Fact:
If VPH is missing, the phone may power on but network and signal-related functions may not work properly.

📘 Why These Lines Matter:
Line Full Form Source Voltage Major Role
VBUS Voltage Bus USB Charger 5V Starts charging and initial power flow
VBAT Battery Voltage Battery 3.7–4.2V Main power source for phone
VPH Phone High Line Power IC 3.7V+ Powers CPU, RF, Modem etc.

📍 Where You’ll Find These in a Phone Circuit?
VBUS: At charging port → goes to USB switch or Charging IC

VBAT: From battery connector → into Power IC or PMIC

VPH: Generated inside PMIC → distributed across the board

🔬 Tools Used in This Video:
Multimeter (for voltage checking)

PCB Holder and Magnifying Lamp

Schematic Software (ZXW / EasyJTAG / PDF Diagrams)

Real motherboard examples for Samsung & iPhone

🧑‍🏫 Who Should Watch This Video?
✅ Mobile Repairing Students
✅ Phone Technicians
✅ B.Tech / ITI Students (Electronics)
✅ Anyone preparing for a Repair Career
✅ Businessmen running repair shops

Whether you're a beginner or experienced, understanding power lines is essential to level up your diagnosis and repair success rate.

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#VBUSLineExplained
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What is VBUS
What is VBAT
What is VPH Line
Smartphone Power Supply
VBUS Charging Line
VBAT Battery Line

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