Скачать или смотреть Samsung A03 Sub Board or Charging Strip Diagram | USB Port Layout | Board Level Repair

In this video, you will learn the complete professional reference for Samsung A03 sub board or charging strip diagram, including USB port, charging lines, PMIC lines, battery connector, and jumper points.

Step-by-step guide covers charging trace identification, sub board inspection, voltage line testing, jumper solutions, and board-level troubleshooting.

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 HARDWARE REPAIR GUIDE

Power off Samsung A03

Remove SIM tray

Open back cover carefully

Disconnect battery connector

Locate sub board / charging strip

Inspect USB connector

Clean pins with IPA

Re-seat connector securely

Test continuity of charging lines

Measure VBUS voltage

Check GND connection

Inspect charging IC

Test PMIC voltage lines

Identify CLK, CMD, and DAT lines

Trace battery detection line

Repair broken lines with jumper

Replace damaged USB connector

Reflow charging IC if dry solder

Replace faulty charging IC

Test charging coil if present

Verify battery voltage lines

Reconnect battery

Power ON device

Test normal charging

Test fast charging

Test different chargers

Inspect for heating issues

Verify stable voltage output

Reassemble phone completely

Deliver phone to customer

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