A03s Original Sub Board Charging Strip Diagram USB Port, MIC Antenna & Pinout Full Hardware Solution

Описание: In this video, you will learn a complete professional hardware explanation of the Samsung Galaxy A03s original sub board / charging strip diagram. This guide includes USB charging port lines, MIC signal, antenna contacts, VBUS, GND, and board-to-board connections. Step by step explanation helps technicians trace faults, test jumper lines, check sub board components, and perform replacements. Ideal for mobile repair technicians in US, UK, Europe, and worldwide. No voice and no thumbnail required.

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🛠 30 Step-by-Step Board Understanding / Repair Guide

Power off Samsung Galaxy A03s

Remove SIM tray

Open back cover carefully

Disconnect battery connector

Remove loudspeaker module

Locate charging sub board

Identify USB charging connector

Locate MIC signal line

Locate antenna contact points

Check VBUS supply line

Check GND continuity

Locate D+ data line

Locate D- data line

Inspect connector pins

Inspect sub board flex cable

Measure VBUS voltage

Check D+ and D- continuity

Test MIC signal line

Inspect antenna pad

Check for corrosion or water damage

Inspect charging IC track

Re-solder loose pins if required

Replace sub board if damaged

Reconnect flex cable to main board

Reconnect battery

Insert charger to test detection

Test MIC function

Test antenna signal

Verify VBUS and GND stable

Reassemble phone completely

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