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How to Troubleshoot an LCD Screen?
Attention, new phone repair technicians! LCD screen problems are giving you a headache? Don't panic, grab this super practical troubleshooting guide!
Customer says the screen is black? Don't rush to replace the assembly yet!
👉 Step 1: Check the cable connector for oxidation and looseness. Clean it with an alcohol pad and re-tighten it. This can solve 70% of black screen issues!
👉 Step 2: Test the power supply voltage with an external power supply. If it's below 3.7V, it could be a problem with the motherboard power supply module. Don't blame the screen!
What to do if you encounter a distorted screen or vertical lines?
✨ Focus on the backlight layer and display IC: Gently press the edge of the screen. If the lines change, it's most likely a broken wire inside the LCD panel. If the distorted screen persists, prioritize inspecting the driver IC solder joints. Try re-soldering with a heat gun at 320°C.
Industry secret: 80% of "defective screens" are actually due to cable connection issues!