Infinix Smart 9 Display Light Problem Solution | No Backlight | LCD Light Ways | Hardware Jumper
In this video, we show the full hardware solution of Infinix Smart 9 display light problem, no backlight, dim display, screen visible only with torch, LCD light line ways, backlight coil & filter testing, LED driver section repair, and jumper tricks. This guide is useful for mobile repair technicians working on backlight faults.
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📌 30 Step-by-Step Repair Guide
Remove back cover carefully.
Disconnect battery.
Disconnect display connector.
Inspect LCD connector for burnt pins.
Clean connector with IPA.
Reconnect and test LCD.
Try another LCD for confirmation.
Check backlight fuse continuity.
Replace fuse if open.
Check LED coil (inductor).
Replace coil if no reading.
Check backlight filter.
Replace damaged filters.
Test diode readings of light lines.
Check anode/cathode LED lines.
Test PMIC backlight output.
Check voltage at LCD VLED+ line.
Remove any shorted capacitor.
Clean board for corrosion.
Test backlight IC temperature.
Reflow backlight IC.
Replace IC if faulty.
Check display connector soldering.
Resolder connector if loose.
Test brightness control line.
Replace display FPC if damaged.
Reassemble all parts.
Power on phone and check light.
Perform brightness test.
Final verification on full display.
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