HP G6 Notebook no booting repair

Machine model: HP G6

Motherboard model: 6050A2412201-MB-AO2

Malfunction: Notebook no booting

Maintenance process:

A HP HP G6 notebook motherboard, this machine is Previously repaired, and the fault is Won’t Turn On.

HP G6 Notebook no booting repair Figure 1.

Looking up the drawings, we know that R316 is connected to the Fuse resistor of the charging chip, and there is another MOSFET. After checking schematic, it is found that it is a 5V upper tube, and it is a G-class pad break off.

HP G6 Notebook no booting repair Figure 2.

Besides, there are two resistors and one Capacitor missing.

HP G6 Notebook no booting repair Figure 3.

3V5V EN from EC. Parts, wiring, press Switch, a wisp of smoke, and the 5V tube is hung up.

HP G6 Notebook no booting repair Figure 4.

Find a new upper pipe to replace.

HP G6 Notebook no booting repair Figure 5.

The flying line continued to be powered on, another wisp of smoke, and the upper pipe hung up again.

multimeter chip-to-ground value is normal, replace the upper tube again, and Measuring diode value upper tube is normal. Measure the lower pipe and find that one MOSFET is installed upside down. Replace the lower pipe again.

Power-on standby is 0.2A or so, linear 3V and 5V are normal, measuring PWM 3V5V shows that 5V output is only 2V or so, measuring G or so is only 2V, and VCC is not fully turned on. Then check that FB is normal, and check that the bootstrap MOSFET value is normal. Bootstrap MOSFET was replaced, and the power was turned on again. PWM5V was available, but or so was still 0.2A or so.

Check that the SLP-S4# and SLP_S3#VCC 3.3V of the bridge are normal, and the phase-locked loop, bus and are all normal.

HP G6 Notebook no booting repair Figure 6.

Check the memory VCC, only 0.03V or so. Check, it is normal, the upper tube D is 19V normal, and FB is normal.

HP G6 Notebook no booting repair Figure 7.

multimeter chip phase pin value is not normal, replace the chip, 1.5V came out, and U534 was found to be very hot by hand, which is the problem of VCC.

HP G6 Notebook no booting repair Figure 8.

Lay down the chip value, and find that several pin values are abnormal. When measuring the upper and lower tubes, it is found that the G and S extremes of the upper tube are 50. Replace the chip and the upper tube.