XIAOMI REDMI 4A lcd light problem solution
In this video, you will learn how to fix Xiaomi Redmi 4A LCD light problem. If your Redmi 4A screen is working but the display is very dim or has no backlight at all, this guide will walk you through testing and repairing the LCD light circuit. You'll learn how to diagnose the backlight IC, filter, coil, diode, and display connector issues on the motherboard. This solution is ideal for mobile repair technicians or those fixing their phones at home.
🔧 Step-by-Step Instructions:
Power off the Redmi 4A completely.
Remove the SIM tray and back cover using a plastic opening tool.
Unscrew and remove the mid-frame to access the motherboard.
Disconnect the battery connector to avoid short circuits.
Disconnect the LCD display connector gently.
Visually inspect the LCD flex and connector for burn marks or dirt.
Clean the connector using isopropyl alcohol and a soft brush.
Reconnect the LCD and test the display again with power on.
Use a flashlight to check if the display is visible without backlight.
Locate the backlight fuse (marked “L” or “FL”) on the motherboard.
Test the fuse with a multimeter for continuity.
Replace the backlight fuse if it’s blown.
Locate and test the backlight diode near the LCD connector.
Replace the backlight diode if it's faulty or shorted.
Test the backlight coil/inductor for continuity and damage.
Replace the coil if there’s no continuity.
Identify the backlight IC (usually near the display connector).
Measure the voltage input/output at the backlight IC.
Check if the IC is heating or visibly damaged.
Reflow the backlight IC using a hot air gun carefully.
Replace the IC if reflowing doesn’t restore function.
Inspect tracks and lines for broken connections under microscope.
Use jumper wires to repair any broken PCB tracks.
Reassemble the phone partially and power it on.
Check the display backlight brightness again.
Try adjusting brightness from settings to confirm repair.
Test the screen under both battery and charger power.
Make sure LCD panel is original and fully compatible.
Fully reassemble the phone after successful testing.
Do final checks: brightness, screen timeout, and full visual clarity.
🔍 Hashtags:
#Redmi4A #XiaomiRedmi4A #LCDLightProblem #Redmi4ARepair #BacklightFix #MobileRepair #HardwareRepair #LCDNoLight #PhoneScreenFix #RedmiBacklightRepair