Oppo A79 Charging Strip Sub Board Ways & Diagram | USB Charging Problem Solution 100% Fix

Oppo A79 charging strip / sub board diagram ways and solution full guide. In this video, you will learn how to fix charging problem, USB port issue, and no charging fault using complete hardware troubleshooting.

We explain USB VBUS line, battery connector line, and charging IC path with input/output voltage testing step by step using multimeter. This guide is perfect for mobile technicians and beginners.

🔧 Topics Covered:

charging strip diagram
sub board ways and solution
usb charging problem fix
voltage testing guide
hardware repair step by step
board level troubleshooting
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🛠️ 30 Step-by-Step Instructions
power off phone
remove back cover
disconnect battery
locate charging sub board
inspect usb charging port
check 5v input from charger
trace vbus line
check ground continuity
inspect battery connector line
measure voltage with multimeter
check for short on vbus line
inspect capacitors near port
inspect resistors and coil
check charging ic area
test output to main board
clean usb port with ipa
reflow charging components
replace usb port if damaged
check pmic charging input
test battery voltage while charging
use dc supply for testing
reconnect sub board
assemble device partially
power on phone
check charging indication
test fast charging
monitor battery percentage
full assembly
final testing
confirm charging working
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