Keypad Chinese Phone Charging Line Explained | VBUS, D+ D−| Charging IC Input & Output

Keypad Chinese Phone Charging Line Explained | VBUS, D+ D−, Charging IC Input & Output | Cold & Hot Test | Sinhala 📱 In this video, we will learn how the charging circuit works in Chinese keypad mobile phones and how to diagnose common charging problems step by step using a Digital Multimeter. This tutorial is useful for mobile phone repairing beginners, technicians, and anyone learning keypad mobile charging circuit troubleshooting. 🔋 What You Will Learn in This Video ✅ How the Keypad Chinese Phone Charging Line works ✅ Charging socket and charging pin identification ✅ VBUS line and how the 5V charging voltage travels through the circuit ✅ How to identify D+ and D− data pins ✅ How to check D+ / D− resistance to GND ✅ How to check the VBUS line using a Digital Multimeter ✅ Charging IC Input voltage testing ✅ Charging IC Output voltage testing ✅ How to identify possible Charging IC faults ✅ How to find charging-line problems step by step ✅ Cold Test – resistance, continuity and short checking ✅ Hot Test – voltage testing with power/charger connected ✅ How to trace the charging line when charging is not working ✅ Common Chinese keypad phone charging problems and solutions 🔧 Basic Charging Line Flow Charger → Charging Socket → VBUS → Protection/Filter → Charging IC Input → Charging IC → Charging Output → Battery 🔋 D+ / D− → Data / Detection Lines** GND → Ground / Negative** ⚠️ Important: Resistance and voltage values can vary between different Chinese keypad phone models and charging IC designs. Always compare the circuit with the relevant schematic or a known-good board before replacing components. 🎯 This Video Is Useful For 📱 Mobile Phone Repair Beginners 🔧 Mobile Repair Technicians ⚡ Charging Problem Troubleshooting 🔋 Keypad Phone Battery & Charging Repair 🧰 Digital Multimeter Testing 📚 Chinese Mobile Phone Repairing Courses If you are learning mobile phone hardware repairing in Sinhala, subscribe to Phone Fix Pro Sinhala*for more practical repair tutorials. 👍 Like | Share | Subscribe 🔔 Turn on the notification bell so you don't miss the next mobile repairing lesson. --- 📲 WhatsApp Group [Join Phone Fix Pro WhatsApp Group](https://chat.whatsapp.com/LZzBue7Ic0B...) 📘 Facebook Page Phone Fix Pro 🎵 TikTok @phonefixpro Keypad phone charging problem #Chinese mobile charging line #Chinese keypad phone repair #VBUS line testing #charging IC testing #D+ D- testing #charging pin testing #charging circuit #charging IC input output #mobile charging problem solution #cold test #hot test #mobile repairing Sinhala #Chinese phone repairing Sinhala, #keypad mobile repairing #mobile hardware repairing #digital multimeter testing#PhoneFixProSinhala #MobileRepairing #KeypadPhoneRepair #ChinesePhoneRepair #ChargingProblem #VBUS #ChargingIC #DPlusDMinus #MobileRepairSinhala #PhoneRepair #ColdTest #HotTest#Here are #strong YouTube SEO tags# for this video. I’ve focused on #Chinese keypad phone charging, VBUS, D+ / D−, charging IC, cold/hot testing, and Sinhala mobile repairing#keypad phone charging problem #chinese keypad phone charging #chinese mobile charging problem #keypad mobile charging problem #keypad phone repair #chinese phone repair #mobile charging line, charging line explained #VBUS line #VBUS testing #VBUS line testing #charging IC# charging IC testing# charging IC input #charging IC output #charging IC fault #charging pin testing #charging pins #D+ D- testing #D plus D minus #USB data pins #data pin testing #data line testing #charging socket testing #mobile charging circuit #mobile charging circuit explained #mobile charging fault #mobile charging problem solution #keypad mobile repairing #chinese mobile repairing #mobile hardware repairing #digital multimeter testing #multimeter #charging test #cold test mobile repairing #hot test mobile repairing #charging voltage test #charging line voltage #charging IC voltage #mobile repair sinhala #mobile repairing sinhala #phone repairing sinhala #chinese phone repairing sinhala #keypad phone repair sinhala #Phone Fix Pro Sinhala #Phone Fix Pro#චයිනීස් ෆෝන් රෙපෙයාර්#keypad phone repair sinhala #mobile repair course sinhala #mobile repairing course sinhala #charging problem sinhala #charging ic sinhala #vbus line sinhala #mobile charging sinhala #phone repair sinhala #mobile hardware sinhala#Best practice# Put the most important keywords first—especially #keypad phone charging problem#chinese keypad phone charging#VBUS line#charging IC testing# and #mobile repairing sinhala