fault: Turn on the white screen, externally connected,
, see the picture below:
, motherboard picture front view
officially started, a colleague came to an Acer notebook to say that turning on the white screen, maybe it was a graphics card problem, so I asked me to help me check it out, and then I went back to have a meal myself.
turned on the white screen. I saw that the keyboard was quite new and the machine was quite old. I suspected that water had been in, so I restored the fault. I did turn on the white screen and disassembled it directly. The keyboard was indeed replaced. There is a date later. The machine also got water. It seems that someone had repaired it before. I don’t care. I turned on the white screen. I usually take a few questions. Let’s check the power supply first. So I downloaded the drawings, found the location number of the screen interface, search for the keyword lcd1 and found it. Look at the picture below:
Before downloading the drawings, I tested that the several insurances next to the screen power supply had voltages, so let’s check the voltage of LCDVDD. The 29th day of the screen interface. The interface can also be tested directly on the capacitor connected to pin 30. This voltage should be 3.3v, and the actual measurement is 0v. There is no short circuit in the resistance value. Then search for the source of the voltage measurement and continue to follow the drawing. go... Search keywords LCDVDD Name A 5-pin chip has arrived. The model of this chip is G5285T11U. See the picture below:
Since it is a voltage conversion, then test the working conditions of the chip. The input voltage of the pin 1 and pin 5 are normal, but there is no output, there is an input, and it does not work. Change it decisively.
. Finally, it is the flash diagram.
ps: Don't spray small problems. Hope it can help newbies. , all of them are
ps from Xiaobai: This fault is actually solved in 6 minutes of repair, even dismantling the machine and looking for materials. In fact, you can do it without taking care of it. You know!
Article source: Xunwei.com
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