ASUS K46C notebook does not turn on for repaired

ASUS K46C notebook no booting, replace a 15K resistor after the fault repair.

Machine model: ASUS K46C

Version number: k46cm rev20

Fault phenomenon: notebook no booting

Maintenance process: there is no standby after connecting DC power supply, the dismantling board has been repaired, the isolation pipe has been replaced, and the 35V CPU VCC Inductor has been welded.Common point VCC 0.86v isolation, however, measured under the ground Diode value is normal, each large Inductor measured also no Short circuit, fly the root line directly to the common point or no standby, honest to Jump wire to check the circuit!

After looking at the charging and discharging chip bq25a has been replaced by the owner, and the lower 20 pin VCC is normal, 1.2 pin 0.86v is equivalent to the common point VCC, 4 pin 0V, 5 pin 0V, 6 pin 3.23, the problem occurs, the 6th pin VCC of bq25a can not be higher than 3.15v, which must be asus’s resistance problem.

ASUS K46C notebook does not turn on for repaired Figure 1.
The upper voltage divider diode value is close to 100k, which is normal. The lower voltage divider should be 15K. The measured 21k is obviously changed. Find Parts motherboard and replace it with 15K, then connect with DC power supply or there is no standby current.

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After measuring 5V VCC, there is no 3V, which is normal.switch can be normal. After switch, the current is 0.9 and the 3V is normal. The memory VCC is also normal. Connect the memory booting up, and the maintenance is completed.