16.03.2011., srijeda
Sony VGP-BPS9 don’t boot failure detection
|
Sony VGP-BPS9 Laptop fault conditions without power namely in several ways: First, the adapter with no power, but the battery power is normal; Second, the use of power adapter is normally, but with no battery power; Third, both of the adapter and the battery can not power up. The three failures are very common in laptops, in order to repair these three faults, we must master the process of laptop power. Here's a simple analysis VGP-BPS9 notebook power process. When we press the power switch ,the low (or high) trigger the PWRSW # signals of PC87591 and PC87591 issue of PM-PWRBTN # signals trigger ICH, ICH PC87591 laptop back to working mode of the three signals, then the main power supply laptop trigger switch, such as main power, CPU power supply, etc., and then follow the steps in the figure added power. It should explain the specific content of the figure, AC IN is the power supply adapter, Sony VGP-BPS9 Battery is the main battery power supply, Always ON will be output as long as the regular plug in the power supply, the main power supply chip (SoC is MAX1632, It should be noted that as long as the plug in the power of the circuit is after the third step will be appearing in the power supply, commonly known as standby power, the standby power output provided to the laptop, I am not part of the main power supply, mainly for notebook power also need to map the I / O PC87591 chip standby power in order to drive future notebook computers provide the main power supply. The main power supply is a notebook drive one of these, there is a situation that is plugged into a power system after the chip is not in will have standby power, you need to drive the main power generation system chips, the current laptops main power supply two systems coexist. After analyzing the above principle of laptop power supply, the following combination of symptoms fault analysis above. First, make the adapter without power, but the VGP-BPS9 Battery or adapter power-normal, but without using battery power up. Maintenance needs of both fault detection of the two protective isolation circuit, the figure close to the adapter and two battery-powered box circuit, which consists mainly of two isolated circuit components have insurance, MOS tube and diode. This is the most easily damaged part of the insurance, then the MOS pipe, there is a diode. Detection of the two first met in the isolation circuit fault insurance, MOS tube, then the diode, so that we can basically find fault components. Second, the use of the adapter and the battery can not power up. In such failures, we are here to introduce the method in accordance with the principle of detection. In such fault detection process is as follows: 1, Detect part of the motherboard if there is short circuit in the main power supply; 2, Detect CPU power or the CPU ,whether it is normal, because some machines can also cause CPU power failure; 3, detect system's main power supply chip output,whether it is normal, if not normally ,you need to confirm whether it is normal output circuit, whether pipe and the MOS diode in output circuit is normal; 4, Detect system chip input power conditions, including the main power supply, etc.; detected a problem with the input circuit of the input circuit should be carefully monitored, especially the input circuit of the insurance and MOS is the most easily damaged. In summary, the failure of Sony VGP-BPS9 laptop power failure is very common, such as voltage instability, the use of long time aging caused by the device, circuit design, current shocks can cause a power failure. If you encounter this failure to open the laptop in the case, follow the above procedure for testing. |
