Lenovo R7000 Blurred screen, modify the firmware (BIOS program) to enable the computer to start automatically when the boot.
Machine model: Lenovo R7000
Fault phenomenon: screen Blurred screen
Maintenance process: the Lenovo r7000 Blurred screen, which was sent for repair by peers, is very serious. It costs money when it is started, but it can enter the system. The colleague introduces that the customer is an office workernotebookComputer, peers themselves said that the graphics card may be broken, need to Repeat welding graphics card or replace the graphics card to solve.
Lenovo R7000 flower screen repair Figure 1.
Boot screen
Lenovo R7000 flower screen repair Figure 2.
Blurred screen is really serious for the interface of preparing to boot. I believe many maintenance engineers have encountered this kind of Blurred screen. The maintenance method must be to start with a simple method first and exclude the memory first. The Blurred screen caused by a (Dell Computer) memory two days ago is not much different from this.After clearing the memory, the fault still remains.Lock fault in the motherboard, remove the machine, take out the motherboard to see the CPU and graphics card.
Lenovo R7000 flower screen repair Figure 4.
Some years ago, the master who repaired notebook computers liked to use one of the moves is to heat SMD REWORK STATION Repeat welding first to see whether the display is normal. If the display is normal, it means that the display card Inveracious Soldering, and then go to Repeat welding on the BGA Rework Station welding plaorm. We can also try to heat SMD REWORK STATION Repeat welding, or Blurred screen, with BGA Rework Station Repeat welding still Blurred screen, and feel Blurred screen is more serious,It means the video card is broken.
This video card chip is more expensive to buy, to be honest, to help peers replace the graphics card, if there is no professional test equipment to test the graphics card chip, it is very easy to get hit.Finally, let the peer communicate with the customer, whether the office computer is OK or not, and the customer agrees that as long as it is repaired, it can work normally, and other things don’t matter.This machine has its own unique display, but because the display Blurred screen cannot be adjusted, he finally communicated with his maintenance friend, and he thought of a move. By modifying the firmware (BIOS program) to make the computer automatically use the display when it starts up, it can solve the problem of Blurred screen.
According to this maintenance plan, the BIOS was quickly flashed. After the test,no booting might not be installed because of the urgent test. I thought that there was something wrong with the BIOS program, and then the BIOS of the original machine was still no booting. After taking out the mainboard, carefully checking it, carefully installing it back, starting Blurred screen again, and then brushing the modified firmware, the display was normal.
Lenovo R7000 flower screen repair Figure 5.
Lenovo R7000 flower screen repair Figure 6.
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