How to Trace Short Circuit in Mobile Motherboard
π What is Short Circuit in Mobile?
Short circuit tab hota hai jab positive (VCC) aur ground (GND) line aapas me connect ho jayein, ya koi component internally short ho jaye. Isse:
Mobile dead ho jata hai
Battery jaldi heat hoti hai
Phone boot nahi hota ya restart loop me chala jata hai
β οΈ Common Causes of Short Circuit
Water Damage β Moisture se carbon deposit hota hai
Faulty Capacitors β SMD capacitors sabse zyada short hote hain
Burnt ICs β Power IC, Charging IC, Audio IC, CPU
Wrong Jumper or Repair Mistake
High Voltage Charger/Lightning Strike
π Tools Required
Digital Multimeter
DC Power Supply
Hot Air Gun
Microscope (for small components)
PCB Cleaner (Isopropyl alcohol)
βοΈ Step-by-Step Method to Trace Short Circuit
Step 1: Visual Inspection π
Board ko microscope se check karo
Burnt area, corrosion, ya carbon deposits search karo
Step 2: Continuity Test (Multimeter) π
Multimeter ko diode/continuity mode par set karo
VCC line aur ground test karo
Agar beep constant aaye β short confirmed
Step 3: Resistance Test π
Multimeter ko resistance mode par set karo
Low resistance (near 0Ξ©) means direct short
High resistance means line is ok
Step 4: DC Power Supply Method π
Motherboard ko DC Power Supply par connect karo
Voltage set = 1V to 2V (start low)
Current draw observe karo:
High current immediately = direct short
Finger test / thermal camera use karke heating component identify karo
Step 5: Heat Method π‘οΈ
Agar faulty capacitor/IC short hai β woh jaldi garam hoga
Heat spot par component replace karo
Step 6: Isolation Method βοΈ
Shorted section trace karke components remove karo one by one
Short disappear hone par faulty part confirm ho jata hai
Step 7: Repair / Replace π§
Faulty capacitor/IC ko replace karo
Jumper ya reballing sirf tab karo jab zaroori ho
β‘ Pro Tips for Technicians
Hamesha low voltage se start karo jab DC Power Supply use kar rahe ho
Kapton tape use karke nearby components protect karo jab heat do
Agar short capacitor mil jaye β usko nikal kar phir line check karo
Always cross-check with schematic diagrams (ZXW, Wuxinji)
β Benefits of Correct Short Circuit Tracing
Time save hota hai
Repair success rate improve hoti hai
Customer ko long-lasting solution milta hai
Shop ki reputation grow hoti hai
π Meta Description (SEO)
How to Trace Short Circuit in Mobile Motherboard β Complete step-by-step guide using multimeter, DC power supply, and heat detection methods for mobile repair technicians.
