ASUS FX86F notebook can't be turned on to measure each inductance without short circuit When PM_SUSB/C # is disconnected, the current does not jump. It is found that the power supply of VCCIO is abnormal After being removed, it is powered on to 0.15 and does not jump. After repeated confirmation, it is the problem of APW8715 chip The replaced chip is powered on and booted to test the perfect bright machine
HP tpn-i133 notebook Blurred screen crash, remove the motherboard, there is a resistance corroded by moisture,corroded by moisture resistance measurement 356k.The 7th pin VDDQ of the chip_Ton is 510k.This resistor is to change the frequency of Switch and change it to 510k resistor directly. It is normal,VCC 1.22V.
Lenovo Xinchao 7000-13 laptop no booting maintenance Machine model: Lenovo xiaoxinchao 7000-13 notebook Fault phenomenon: notebook no booting Maintenance process: Lenovo Xinchao 7000-13, plug-in adjustable power on no power on, no standby.Remove the back cover, unplug the COMS battery and…
Lenovo Lenovo Y7000 2019 boot screen, a MATS USB flash drive connected to automatically run, you can get the test results, disassemble the machine, and put the machine on the heating platform; At the same time, prepare a new GDDR6 video memory of SAMSUNG, and the motherboard will feel hot. You can begin to disassemble the video memory, then handle the pads and solder the new video memory.
no booting ble found on the b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, b switch, BXT.
Power-on detection standby is 3V 5V, and the point switch is not triggered. Upon inspection, it is found that 3VSUS_PWRGD is pulled low, and the high level of 1.0VSUS_PWRGD is required first, so that 3VSUS_PWRGD will not be pulled low. After running the line, it is found that there is a disconnection, but the capacitor must be removed to make up for it. Direct flying line, power-on test, perfect lighting machine.
The main board short circuit causes the soft breakdown of PQ5303, which leads to the protection of the charging chip BQ24780, resulting in the non-conduction of the protection isolation circuit.
Dismantle PQ5303, then connect PJ5301 node, turn on the power supply, turn on the power supply, the current instantly rises and jumps, and then connect the screen to test the perfect lighting machine.
After the machine was disassembled, the BIOS was immediately flashed, which was useless. It was found that the EC also had BIOS, and the failure was still the same. Check the en of U1 to open VCC.When measuring 3.3V to ground, the resistance is zero. It is 3.3V Short circuit Current protection.
HP da0r13mb6e1 notebook does not output 3v5v, you can first try to replace the stable Capacitor, and then replace the chip.
