ASUS K43SD 4.1 notebook is not turn on for repair

Machine board No.: ASUS K43SD 4.1

Fault phenomenon: laptop no booting,auto power off restart, do not run code

Maintenance process: when you get it, it’s no power on. There’s no standby VCC at all. Shake the power head and you’ll get standby VCC.As we all know, ASUS’s power head is a large common failing.

Immediately dismantle the machine. After dismantling, connect the broken parts directly. Buckle auto power off pool and let it own switch. As a result,auto power off restarts in this scene.

ASUS K43SD 4.1 notebook is not turn on for repair Figure 1.

ASUS K43SD 4.1 notebook is not turn on for repair Figure 2.

ASUS K43SD 4.1 notebook is not turn on for repair Figure 3.

ASUS K43SD 4.1 notebook is not turn on for repair Figure 4.

For VCC and auto power off like this, first disconnect the PG of CPU VCC and turn it on. The point on the left is PG and the one on the right is on.

ASUS K43SD 4.1 notebook is not turn on for repair Figure 5.

VCC is caused by VCC or VCC.There is no change after disconnecting pg. if the opening current stops again,VCC can be measured.

ASUS K43SD 4.1 notebook is not turn on for repair Figure 6.

It is found that the memory VCC is obviously wrong, but both the bridge VCC and the bus VCC are normal. It is certain that there is something wrong with VCC.

ASUS K43SD 4.1 notebook is not turn on for repair Figure 7.

ASUS K43SD 4.1 notebook is not turn on for repair figure 8.

A look at pc8901 a bit corrode, immediately changed a,VCC once normal.Connect the disconnected nodes again, and the current will start, and auto power off will not cycle.

After installing the heat sink, the memory current does not run out of code. I thought there was something wrong with the BIOS, but I still didn’t run the code. After finding a good memory, I ran out of code booting up. When I look back, there is a point corrode in the memory, and Measuring diode value is not broken. So, make a decision on Repeat welding.