Samsung J1 SM J100H Home Key Problem Solution | Complete Hardware Repair Guide

In this video, we explain the Samsung J1 SM-J100H Home Key Problem Solution. If your Home Button is not working, unresponsive, or only works sometimes, this hardware repair tutorial will help you. Learn how to check key flex, clean contacts, measure voltages, repair PCB tracks, and replace faulty parts step by step. This guide is useful for mobile repair technicians and engineers in Urdu Hindi.

🔧 30 Step-by-Step Instructions

Power off Samsung J1 SM-J100H.

Remove the back cover and battery.

Unscrew and open the middle frame.

Disconnect the display assembly.

Inspect the home key flex connector.

Clean flex contacts with IPA.

Reconnect the flex securely.

Test home key function.

If not working, measure voltage at home key connector.

Verify continuity from home key flex to PCB.

Check series resistor and filter near home key line.

Inspect PCB tracks under magnification.

Repair broken PCB lines with jumper wire.

Reflow connector solder pads if loose.

Replace home key flex cable if damaged.

Test with a new home key assembly.

Check PMIC output supplying key circuit.

Measure ground and VCC lines on the connector.

Ensure no short circuit on home key line.

Inspect for corrosion or dust near home key pads.

Replace faulty resistor or filter in the circuit.

Test continuity from key line to CPU.

If no response, check key input pin on CPU.

Reball CPU pads if necessary.

Try replacing the entire keypad flex board.

Reassemble the phone after repair.

Power on and test home key functionality.

Check if home key responds in safe mode.

Verify function in both hardware and software.

Final test to ensure stable home key performance.

📢 Hashtags

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