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ASUS Shenji pro554u screen does not display repair
Machine model: ASUS Shenji pro554u
Fault phenomenon: the screen does not display after changing the keyboard.
Maintenance process:
In the same industry, the keyboard of pro554u of ASUS Shenji was replaced without testing. After installation, there was no display. Dismantle the machine and take out the motherboard. The board version number is shown in the figure.
ASUS Shenji pro554u screen does not display repair Figure 1.
Pull out the small battery, power on automatically, the screen does not display, look at the current 0.322 does not move, external display does not respond.
ASUS Shenji pro554u screen does not display repair Figure 2.
Asustek common failing, CPU vccore 0.875v, except for the centralized display Inductor and the independent display Inductor, there is no VCC, other large Inductor VCC, are normal. After measurement, finally found the problem, + 12vsus is only 4.1V, + 3vs is only 2.4V.
ASUS Shenji pro554u screen does not display repair Figure 3.
The booster did not rise, only to replace the hexagonal pd8701,Parts motherboard did not find the same type of chip, screen printing L44 MOSFET, directly fly a line.
ASUS Shenji pro554u screen does not display repair Figure 4.
ASUS Shenji pro554u screen does not display repair Figure 5.
And then there was a miracle.
ASUS pro554u screen does not display repair Figure 6.
Connected to the screen Normally booting up, installed test, all functions are normal, maintenance is over.
ASUS Shenji pro554u screen does not display repair Figure 7.
