Shenzhou Z7-KP7GZ notebook boot display flash screen; Motherboard problem opens drawing positioning to screen display interface signal normal seems 0V And this one is 5V, so after the Q27 in Figure 1 is removed, the power-on test is perfect, and the troubleshooting and maintenance of the bright machine are over
Apple MacBook a1466 laptop water damage screen does not display, under the microscope, we found the resistance r7731-pin corrode pad break off. Make up the point, install the resistance, and solve the fault.Normally booting up.
Received a daysky cometnotebookAfter the computer is plugged in, the power indicator flashes. It is suspected that there is a problem with the power supply. The measured voltage has changed from 12v4a to 18V. The power supply is broken.
Find the battery chip pU7 bq24760, and test large current on the bare battery board. Your hand just touches a place, which is very hot. Look at MOSFET, which is a common S-tube of q85, pq13 and pq34.Trace the source of q85 and replace it from think Parts motherboard. Plug in the battery and power on it. It will not be large current when it is powered on. It will not be auto power off when it is turned on. It can be charged and troubleshooting when it is installed for testing.
Acer zq6a laptop boot does not respond,no power on maintenance Acer zq6a laptop did not respond when it was turned on. When it was opened, it was found that there was only 0.06v VCC on the boot key. The details…
Lenovo Xinchao 7000-13 notebook no power on, found the fault point c6705 to the CPU chip VCC pin filter Capacitor Short circuit.After replacement, the common point diode value becomes more than 400 ohm, and the laptop can be turned on normally after power up.
ASUS k53s laptop boot indicator light is on,Won't Turn On, found that the arrow points to two MOSFET, no conduction is controlled by a small six pin chip behind, can not find the same replacement, directly remove short-circuit 34 pin, the current immediately surged up,Normally booting up.
Lenovo E460 laptop turned on the dark screen and began to dismantle the screen. It was found that Capacitor,Short circuit and Fuse around the screen booster chip were burnt out. The Current heating test method was used, and 3V VCC Current heating test was added to the back stage of Fuse. After touching the boost chip, it was hot to remove it. It was found that Short circuit was eliminated, and the screen was delivered directly. The new screen was replaced and the fault was solved.
Xiaomi 161201-aa notebook no booting, the positive pole of 5V Capacitor and the ground are connected with external Connect the power supply source, plug in 19v and standby normally 0.015, press the start key screen booting up.Find a chip to replace, plug in and retest, the voltage has been normal, troubleshooting.
Lenovo Xiaoxin air13iwl laptop standby Short circuit. When the current is adjusted to 2V, the current is more than 4a. Under a sticker, there is an Capacitor next to the standby chip pu701, which is directly removed.Normally booting up。Video card driver, fan, all normal, troubleshooting.
