华硕G533R 显卡电源管理用的MP2888A，22脚电压0.8V，

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华硕G533R  显卡电源管理用的MP2888A，22脚电压0.8V，上拉电阻240K，下拉10K，接20V电压，计算是0.8V。和神舟别的电脑都是1.2V。有维修的师傅测量一下，看看多少V

                               
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Input Voltage Sensing
The input power supply voltage is sampled at
VINSEN with a resistor divider (see Figure 8).
The sensed input voltage is used for PWM on
time calculation, VIN_UVLO, VIN_OVP fault
protection, VIN_UV warning and input voltage
monitoring.
In designs, the divided voltage on VINSEN
should not exceed the ADC sampling range
(1.6V) at the maximum input voltage. A 1 -
10nF ceramic capacitor from VINSEN to AGND
is recommended as an input sense filtering
capacitor (CIN) (see Figure 8).  
Program the input voltage sensing divider ratio
with register MFR_VIN_SCALE_LOOP (C0h).
The calculation of the ratio (KIN) is shown in
Equation (12):
在设计中，VINSEN上的分压在最大输入电压时不应超过ADC采样范围（1.6V）。建议在VINSEN与AGND之间使用1 - 10nF的陶瓷电容作为输入检测滤波电容（CIN）（见图8）。
分压计算不超过1.6的设计范围就行