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If you want to learn Mobile Repair in a complete systematic way, contact us for Online Courses by Master Prince.
We teach deep-level schematics, circuit understanding, signal flow, and step-by-step diagnosis — no guessing, no time waste.
If you want to change your career and become a real mobile technician, join today: +91 8901794940
✔ What are Pull-Up Resistors
✔ What are Pull-Down Resistors
✔ Why they are required in mobile logic circuits
✔ How they create Logic HIGH & Logic LOW
✔ Where they are used in I²C lines, sensors, touchscreen, backlight, CPU communication, SMBUS, and digital circuits
✔ Real examples from mobile schematics
✔ How incorrect pull-up or pull-down can cause mobile faults

This video will help you understand signals like:
– SDA / SCL (I2C Lines)
– Reset, Enable, Trigger, ON/OFF
– BUS Communication
– Digital signal behaviorBad or missing pull-up/pull-down resistors can cause serious faults like:

🔸 Dead phone
🔸 Auto restart
🔸 Touchscreen not working
🔸 Backlight not turning ON
🔸 Charging IC not detecting
🔸 No network / unstable network
🔸 Display I2C communication fail
🔸 Battery percentage stuck
🔸 Sensor failures

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Understanding these circuits helps you diagnose faults professionally instead of trial & error.
Join our Online Professional Course:
✔ Deep-level PCB training
✔ Schematics reading (Borneo)
✔ Section-wise diagnosis
✔ Charging, Display, Network, UFS faults
✔ Short finder usage
• Charging not working
• Charging IC short / bypass
• No display / backlight fault
• Phone dead / no power
• Auto restart
• Battery draining fast
• Network not working
• UFS flashing issues
• Touch not working
• No boot, logo stuck
• Mic / speaker faults
• Short circuit tracing
• VPH_PWR short
• PMIC heating
• CPU short diagnosis

✔ CPU section understanding
✔ Step-by-step repair process
✔ Multimeter testing for all components

Contact Now → +91 8901794940 (Master Prince)
Become a technician who understands logic, not just parts replacement.


A must-watch for anyone who wants to master deep-level mobile PCB repair.