Apple Macbook Pro screen abnormal display Blurred screen repair

Apple Macbook Pro screen abnormal display Blurred screen repair

Machine model: Apple Macbook Pro

Main board version number: 820-2915-A

Symptoms: The screen is abnormal.

Maintenance process:

Upon receipt of a MacBook Pro, the customer description shows that Blurred screen is displayed abnormally.

Apple Macbook Pro screen abnormal display Blurred screen repair Figure 1.

Apple Macbook Pro screen abnormal display Blurred screen repair Figure 2.

This machine is the graphics card door of AMD graphics card, that is, the thermal expansion coefficient is different due to the design defect of the graphics card chip itself. After a long time,Blurred screen will be soldered. The picture below shows the GPU model, and the original chip is 11 years old.

Apple Macbook Pro screen abnormal display Blurred screen repair Figure 3.

Order the chip and Stencil online, and order the new and improved GPU for 20 years. Here, the new GPU chip is not hot-resistant, and the temperature of BGA Rework Station is completely lowered, with the highest temperature of 250 degrees, otherwise the chip will crack at 255 degrees, definitely crack!

Apple Macbook Pro screen abnormal display Blurred screen repair Figure 4.

Go to rework station, replace GPU, and store Repeat welding video memory.

Apple Macbook Pro screen abnormal display Blurred screen repair Figure 5.

Apple Macbook Pro screen abnormal display Blurred screen repair Figure 6.

Power on no display, but there was a sound. Test that the backlight master VCC didn’t, and one Fuse burned out. After using the wire Short circuit Fuse,no booting, measured and found that the backlight master VCC Short circuit.