Take over a HP TPN-q194 fault machine, which is in good appearance. First of all, the HP machine is recommended to be repaired with the original adapter, and there will be some inexplicable failures with the adapter.
[maintenance process]
The motherboard of Huawei MateBook 14 notebook is corroded, and the capacitor foot is badly corroded. After being removed, it is measured to be about 300NF and replaced with a 10NF notebook. When plugged in, it is turned on directly, and the BIOS interface appears on the screen, which makes the machine light up perfectly.
First change BQ24781 charging chip, replace the power plugged in no standby, detection found that disconnect the main power supply of the graphics card 19V, it can be triggered normally. Find the point of failure, again the graphics card side of the problem.
Asus FL5900U laptop does not trigger not turn on, plug in and try the current 0.010A does not trigger, directly find K42J material board to remove one over, replace the resistance, and so the board is cold, plug the current directly run up the light machine.
Lenovo Z500 notebook standby does not trigger repair, check the switch JPWRB1 4-pin voltage is 1.13V is not correct, D26 2-pin resistor R642 end 3.3, end 1.131, this resistor has a problem. Directly remove this resistor a line to pull over, and then power on the test 4 pin voltage 3.3 has, boot trigger, troubleshooting, repair to this end.
DELL 14-7447 notebook no booting™ 3801 is repaired without power on. [machine model] DELL 14-7447 notebook [motherboard version number] Quanta AM7 [Failure] Notebook no booting is not powered on. [maintenance process] Received a DELL 14-7447 notebook, and the fault description…
The cw65l003 laptop of Xuanlong destroyer doesn't show when it is turned on, and no trace of corrode is found in the water, so it should be repaired according to switch;When rsmret ා, it is found that there is no VCC, replace u42, start test,Normally booting up!
Dell 14-7460 notebook often suffers from blue screen of death and memory slot damage. The initial judgment may be that the memory slot or cpu has pad break off.
Disconnect the battery link line, connect the memory with the corresponding solder joints on the memory slot with thin enameled wires, insert the memory into the memory slot, start the test, troubleshoot and repair.
First, look at EC_RSMRST#, then look at PCH_PWR_EN. It turns on +20VSB, and then guess that RPC8 has poor performance. 4 pin exposes VCC, which causes EC 2 pin to output 2v pin abnormally when it is in standby, and 0v when it is in standby. When RPC8 is replaced, it turns on normally
Dell 14-7460 notebook blue screen of death, the fourth pin in the memory slot of DIMM1 has water damage corrode. Disconnect the battery link wire, connect the memory with the corresponding solder joints on the memory slot with a thin enameled wire, try to use the shortest wire, weld it twice, insert the memory into the memory slot, start the test, and repair the fault.
