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ASUS X55VD notebook screen does not display repair
Machine model: ASUS X55V
Main board version number: X55VD REV:3.1
Malfunction: Notebook display screen does not display, and the external display screen is gray.
Maintenance process:
An ASUS X55VD laptop, which is Previously repaired. Self-test has passed.display screen does not show that VGA external monitor indicator has a response but only has a gray backlight screen.
Dismantle the machine and take out the motherboard. Many places have been repaired, BIOS has been brushed, memory particles have been removed, and the onboard memory of the motherboard has been shielded.
Asus X55VD notebook screen does not display repair figure 1.
The graphics card has also been repaired.
Asus X55VD notebook screen does not display repair figure 2.
According to the architecture of HM76 South Bridge, CPU sends display signals to South Bridge through FDI bus, South Bridge sends signals to the screen through LVDS lighting cable, and VGA signals are directly output by South Bridge. If the screen is not displayed, it means that the problem is the FDI bus signal or the South Bridge.
Check that the FDI of Nanqiao and VCC of LVDS module are all normal, and find problems when measuring VCC of CRT module.
Asus X55VD notebook screen does not display repair figure 3.
Measure +VCCA_DAC_1_2 VCC not, L2603 (physical code) has Open circuit, and+vcca _ DAC _ 1 _ 2 measure the ground diode value Short circuit.
Asus X55VD notebook screen does not display repair figure 4.
+3VS after L2603, there are two Capacitor and South Bridge.
Asus X55VD notebook screen does not display repair figure 5.
SMD REWORK STATION measured Capacitor Open circuit,PAD and Open circuit and found one Capacitor Capacitor.
Asus X55VD notebook screen does not display repair figure 6.
Inductor and Capacitor were replaced,diode value was restored, and the screen test showed that the display was normal, which was perfectly repaired.
Asus X55VD notebook screen does not display repair figure 7.
