Lenovo E460 Notebook Boot Dark Screen repair

Check that the backlight source is EC119 pin, and there is no broken line or short circuit, and the resistance value is about 566. Find a 3.3V forced pull-up directly on the motherboard, and the test is still a dark screen.

Machine model: Lenovo E460 notebook

Fault phenomenon: Lenovo E460 notebook standby current is 0.009, the screen is dark after power-on, and the boot screen can be seen vaguely.

Maintenance process:

Open Xinzhizhao software and check the drawings. Check the three conditions, the screen power supply, screen opening and grounding are good, and measure 1 pin with 18.7 V; 3.3V for pins 6, 7 and 9, and 0v for BKOFF# for 11 pins with backlight turned on;

Lenovo E460 Notebook Boot Dark Screen Maintenance Figure 1

Lenovo E460 notebook startup dark screen maintenance Figure 2

Lenovo E460 notebook startup dark screen maintenance Figure 3

Now that the conditions are met, lock the fault point on the screen. When the screen was disassembled, it was found that the capacitor around the screen booster chip was short-circuited and the fuse was blown. After disassembling, it was replaced by a good test, and it was found that the screen was still dark.

Lenovo E460 notebook startup dark screen maintenance Figure 4

Lenovo E460 notebook startup dark screen maintenance Figure 5

Measure the safety again and burn it. Use the machine burning method. After the safety, add 3V voltage to burn the machine. When the booster chip is hot, remove it. If the short circuit is found, fix the screen and deliver it directly. Replace it with a new screen, and call it a day and solve the problem perfectly.