Acer zq6a laptop boot does not respond,no power on maintenance

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 were incorrect. Looking up the drawing, it was found that the boot key was directly connected to EC’s 95 pin.After switching on power, 3vpcu is available, press start,Normally booting up.

[machine model] Acer zq6a notebook

[motherboard version] daozq5mb6d0

[fault phenomenon] the laptop does not respond when it is turned on,no power on

[maintenance process]

Connect a Acer zq6anotebookThe brand is emachines.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 1

There is no response after pressing the start button. It is found that there is only 0.06v VCC on the boot key when the machine is disassembled. It is found that the power on key is directly connected to EC’s 95 pin by looking up the drawing.

no power on 1, zxt6a001

After checking EC, it was found that avcc was 0V, which came from 3vpcu.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 2

It is found that it is produced by pu4.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 3

After switching on power, 3vpcu is available, press start,Normally booting up.You think this is over, the real twists and turns begin!

This book was replaced by a customer. It took two days to use the no booting. After repairing the booting up, he installed the battery and came back to find the notebook cold.Press boot still did not respond, and the adapter light actually went out.Pull out the plug and check again, a notebook is black.It was disassembled directly Current heating test and found to be pq21 Short circuit.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 4

Pq21 and pq22 generate 3vpcu, and pq21 and pq22 are changed together for Fuse.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 6

Common point is not Short circuit, power on found still can not switch, 3vpcu is still oAnd Measuring diode value is on the ground.Then Current heating test, found a wonderful work, solid Capacitor pc84 unexpectedly Short circuit.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 7

After replacing this Capacitor, I thought it would be good. Unfortunately, after replacing Capacitor, it was found that 3vpcu diode value 18 was obviously low.Next,Current heating test found that short-circuit current was only 200 Ma,or so, and short-circuit current was too small. Finally, it was found that it was pu6 high temperature behind the battery holder.

Acer zq6a laptop boot does not respond,no power on maintenance figure 8

Acer zq6a laptop boot does not respond,no power on maintenance Figure 9

Current protection e battery of the pu Current protection doesn’t match the temperature of the customer’s battery.Current protection e battery of the pu Current protection doesn’t match.The 3vpcu diode value is still low and replaced with a pu4.At this time, the total number of 3vpcu diode value is normal.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 10

It is found that 3vpcu and 5vpcu can also be generated when the power on key is pressed, but there is still no switch when the power on key is pressed. It is measured that both 3vpcu and 5vpcu are available on Inductor, but avcc VCC is 0V.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 11

multimeter ound that the avcc and VCC pin are not compatible with 3vpcu.Look at the drawing. There is a Fuse resistor r293 on the circuit.

Acer zq6a laptop boot does not respond,no power on maintenance Figure 11

It’s 2.2 ohm, 114 ohm.Direct short-circuit.After power on, it was found that Won’t Turn On and EC were hot. The replacement of EC was finally completed.