Nokia 105 2019 LCD Light Problem Solution | Display Light Ways | No Backlight Fix Step by Step

Описание: Is your Nokia 105 (2019) showing no light, dim light, or display visible only in torch light?
This video explains the complete backlight solution, including LED ways, light filter, diode, coil, PMIC supply, and jumper tricks.
Perfect for technicians who repair keypad phones daily.
Fix all backlight faults: no light, half light, dead light IC, broken tracks, LED short.

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✅ 30 Step-by-Step Repair Guide

Remove battery and open the keypad phone.

Disconnect LCD and inspect connector.

Clean connector with IPA thoroughly.

Check if LCD shows display in torch light.

If display appears, problem is only backlight.

Inspect backlight LED pins on LCD.

Check continuity of LCD light tracks.

Check backlight positive line (LED+).

Check backlight negative line (LED–).

Test backlight diode near connector.

Replace diode if short/open.

Test backlight coil for continuity.

Replace coil if broken.

Check backlight filter for leakage.

Replace filter if burned.

Check for rust/green corrosion near LED ways.

Jumper LED+ line directly from PMIC light output.

Jumper LED– line to ground properly.

Test with new LCD if backlight still missing.

Reflow LCD connector lightly.

Inspect PMIC light section for dry joints.

Test backlight supply voltage using multimeter.

Normal voltage should be between 3V–5V.

If missing, reflow PMIC.

Replace PMIC only if needed.

Clean board again fully.

Reassemble temporarily and test light.

If light works, assemble completely.

Do final testing in low light room.

Deliver phone after ensuring brightness is stable.

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