Hp probook g1 650 does not charge

[giulio93]

Re: Hp probook g1 650 does not charge

To understand if they are good can i take them of the board and mesure in ohm? If the reading is 0 they are shorted, if it's not 0 they are good.
Other question. To find on the market the mosfet, what is the important oart of the marking? Just the first part. For example for the 1 mosfet is enought that is a 7410?

[mon2]

Re: Hp probook g1 650 does not charge

7410 = AON7410

https://www.digikey.com/en/products/...ON7410/3152538

7452 = AON7452

< datasheet is attached >

The AON7410 is available through Digikey. Each one on your list should be available on Aliexpress - they seem to carry everything. Select the vendor with the best rating and fastest shipping and throw your list of parts at them for sourcing.

If you are in a rush, can review alternate subs for each.

On the shorting - yes, that is a possible reading if the part is shorted. If defective (aka partially wounded) - the resistance can vary with the wind and manufacturer. To compare, check your resistance readings of mosfet # 1 & # 4 - same component yet varying resistance values.

It is possible that the mosfet readings are off since each part is still soldered onto the logic board. For this case, you can desolder the part, wait 5-10 mins to cool down the part and allow for discharge. Then measure the contacts on each mosfet again for the resistance.

https://www.aliexpress.com/item/3280...99924011%7Csea

We deal with this supplier often and have been for the past few years:

https://www.aliexpress.com/item/3264...%3A%22-1%22%7D

They should be able to source each one of the listed mosfets. Being so inexpensive, consider spares for the mosfets you have measured.

[giulio93]

Re: Hp probook g1 650 does not charge

Ok I order them. The trusted ali shop is Shenzhen IC store or the other you link me?

[mon2]

Re: Hp probook g1 650 does not charge

We use the last link in my post. They are quick to reply and ship the same day.

China is on a common holiday till May 5 so you should chat them ASAP and maybe they can ship out on May 5.

We installed their AliExpress app on our phone to make it easy to order and chat with any vendor.

Please continue to update this thread with your progress for future readers.

[giulio93]

Re: Hp probook g1 650 does not charge

We use the last link in my post. They are quick to reply and ship the same day.

China is on a common holiday till May 5 so you should chat them ASAP and maybe they can ship out on May 5.

We installed their AliExpress app on our phone to make it easy to order and chat with any vendor.

Please continue to update this thread with your progress for future readers.

so the last part of the marking is not important. isn't it? For example mosfets 1 and 4 are both 7410 but with different lasting part.
I need to spend 3 more euro to have the fast shipping (29/05). Is anything else I should change?

[mon2]

Re: Hp probook g1 650 does not charge

No. The other lines will be manufacturer trace codes such as which factory built the part, the date code, etc.

As a general rule, we like to order a few of each mosfet linked to this charger ic, including some spare charger IC.

Before ordering, remove the battery. Power up with only the adapter.

Are you stable on each power up boot? Does the logic board boot to show you the bios screen? Initial HP boot logo or whatever is normal for this logic board?

[giulio93]

Re: Hp probook g1 650 does not charge

No. The other lines will be manufacturer trace codes such as which factory built the part, the date code, etc.

As a general rule, we like to order a few of each mosfet linked to this charger ic, including some spare charger IC.

Before ordering, remove the battery. Power up with only the adapter.

Are you stable on each power up boot? Does the logic board boot to show you the bios screen? Initial HP boot logo or whatever is normal for this logic board?

With just the power connected the pc does not power up. With the battery the pc works fine. (if i connect both battery and charger the pc boots from the battery and the battery does not being charged).
I order those:
7410
7752
E100BN
BQ736
Should I order others?

[mon2]

Re: Hp probook g1 650 does not charge

If you have fine enough tips on your multimeter, configure your meter to dc voltage mode (30v or higher scale).

Measure and post the voltage of each pin on the charger IC.

Do this very carefully else charger ic can get damaged and stop the logic board from booting.

Suspecting a fault is in the first 2 mosfets which is very common.

A better suggestion is for you to first, carefully measure the voltage reading on each of the first 2 mosfets.

Review,

Pin 1-2-3 = source cluster of pins.
Pin 4 = gate
Pin 5-6-7-8 = drain cluster of pins

Post the readings with the power adapter only attached.

Repeat for the 2nd mosfet.

Red meter lead on the mosfet pin; black meter lead to ground.

The logic board must boot without the battery.

[giulio93]

Re: Hp probook g1 650 does not charge

If you have fine enough tips on your multimeter, configure your meter to dc voltage mode (30v or higher scale).

Measure and post the voltage of each pin on the charger IC.

Do this very carefully else charger ic can get damaged and stop the logic board from booting.

Suspecting a fault is in the first 2 mosfets which is very common.

A better suggestion is for you to first, carefully measure the voltage reading on each of the first 2 mosfets.

Review,

Pin 1-2-3 = source cluster of pins.
Pin 4 = gate
Pin 5-6-7-8 = drain cluster of pins

Post the readings with the power adapter only attached.

Repeat for the 2nd mosfet.

Red meter lead on the mosfet pin; black meter lead to ground.

The logic board must boot without the battery.

Should I do this mesure for mosfet 1 and 2 refering to the pics I share before?

[giulio93]

Re: Hp probook g1 650 does not charge

If you have fine enough tips on your multimeter, configure your meter to dc voltage mode (30v or higher scale).

Measure and post the voltage of each pin on the charger IC.

Do this very carefully else charger ic can get damaged and stop the logic board from booting.

Suspecting a fault is in the first 2 mosfets which is very common.

A better suggestion is for you to first, carefully measure the voltage reading on each of the first 2 mosfets.

Review,

Pin 1-2-3 = source cluster of pins.
Pin 4 = gate
Pin 5-6-7-8 = drain cluster of pins

Post the readings with the power adapter only attached.

Repeat for the 2nd mosfet.

Red meter lead on the mosfet pin; black meter lead to ground.

The logic board must boot without the battery.

It's all 0V from mosft 1 to 3.
4 mosfet has about 4V on S and 4.5V on G and 0V on D. The first 2 values are not stable. They both go up and down from 4 to 4.5

[giulio93]

Re: Hp probook g1 650 does not charge

If thought if the mosfets were shorted the ohm values should be 0, not in Kohm
mosfet
1 is a 7410 BA4324
2 is a 7752 GA4Z2P
3 is a E100BN
4 is a 7410 GA4127

In this message i missclick the 4 mosfet. It's a 7401. On the ali shop you linked me I found 2 tipe of 7401: AON7401 and SI7401. Which is the correct one?
I found other mosfet I like to replace, it is a E4 GVE (i'm not sure on the last part couse it's hard to read it off), this one is good?
https://it.aliexpress.com/item/40000...7eed41a52NidGt

[mon2]

Re: Hp probook g1 650 does not charge

It's all 0V from mosft 1 to 3.
4 mosfet has about 4V on S and 4.5V on G and 0V on D.

The readings are difficult to follow.

Can you post them again but in a format with details like the following?

Mosfet #1

pins 1-2-3 (Source):
pin 4 (gate):
pins 5-6-7-8 (Drain):

and so on for each mosfet.

The above style will make it easier to review. Expecting to see at least some 19v readings on the first mosfet since the DC adapter should be spitting out this voltage -> enters the logic board -> interfaces with the 1st mosfet.

Each mosfet is ENABLED / DISABLED by the GATE pin.

If the GATE pin is sufficient, the flow should be onto the DRAIN. Think of the mosfets as solid state relays.

On the mosfet markings - many vendors build to the same or improved specs as the original. So AON Semiconductor is one vendor; SI = Silicon Labs(?) is another, etc. It is very common to see the same part but from different manufacturers.

The AON brand is popular but you can ask the shop @ Aliexpress on their feedback of the recommended brand for this repair.

Update:

1) adding the datasheet for the AON7410 (I may have done this earlier but not sure)

2) observe the broken (dashed) lines inside the circle of the schematic = ENHANCEMENT style mosfet

3) the datasheet lists as a N-channel model

reference reading:
http://www.learningaboutelectronics....hannel-MOSFETs

So with an ENHANCEMENT N-CHANNEL mosfet, the GATE of the mosfet must be more positive than the voltage it is passing between the SOURCE & DRAIN pins. So assuming that DCIN from the external adapter is ~19V, then the GATE should be about 19V+6volts = ~25V on the GATE to turn the MOSFET ON.

This 'boosted' gate voltage is to be generated by the charger IC if all goes well. The charger IC will accept the ~19v as input and multiply the voltage for the GATE driving of the mosfet (input_base+6v is common) to turn it ON.

To turn the ENHANCEMENT N-CHANNEL mosfet OFF, the gate should be lowered to GROUND or a low enough voltage that is lower than what it is passing between SOURCE & DRAIN.

Review the voltages on the mosfet to move forward. May need the voltage readings on the charger IC next which is also a common point of failure.

[giulio93]

Re: Hp probook g1 650 does not charge

The readings are difficult to follow.

Can you post them again but in a format with details like the following?

Mosfet #1

pins 1-2-3 (Source):
pin 4 (gate):
pins 5-6-7-8 (Drain):

and so on for each mosfet.

The above style will make it easier to review. Expecting to see at least some 19v readings on the first mosfet since the DC adapter should be spitting out this voltage -> enters the logic board -> interfaces with the 1st mosfet.

Each mosfet is ENABLED / DISABLED by the GATE pin.

If the GATE pin is sufficient, the flow should be onto the DRAIN. Think of the mosfets as solid state relays.

On the mosfet markings - many vendors build to the same or improved specs as the original. So AON Semiconductor is one vendor; SI = Silicon Labs(?) is another, etc. It is very common to see the same part but from different manufacturers.

The AON brand is popular but you can ask the shop @ Aliexpress on their feedback of the recommended brand for this repair.

Update:

1) adding the datasheet for the AON7410 (I may have done this earlier but not sure)

2) observe the broken (dashed) lines inside the circle of the schematic = ENHANCEMENT style mosfet

3) the datasheet lists as a N-channel model

reference reading:
http://www.learningaboutelectronics....hannel-MOSFETs

So with an ENHANCEMENT N-CHANNEL mosfet, the GATE of the mosfet must be more positive than the voltage it is passing between the SOURCE & DRAIN pins. So assuming that DCIN from the external adapter is ~19V, then the GATE should be about 19V+6volts = ~25V on the GATE to turn the MOSFET ON.

This 'boosted' gate voltage is to be generated by the charger IC if all goes well. The charger IC will accept the ~19v as input and multiply the voltage for the GATE driving of the mosfet (input_base+6v is common) to turn it ON.

To turn the ENHANCEMENT N-CHANNEL mosfet OFF, the gate should be lowered to GROUND or a low enough voltage that is lower than what it is passing between SOURCE & DRAIN.

Review the voltages on the mosfet to move forward. May need the voltage readings on the charger IC next which is also a common point of failure.

Today I was doing some V mesurments and I noticed that randomly the power led flashed, like a false contact. I grab a termocamera to inspect the mb and i noticed a hot spot at 2 mosfet, i touched them and the pc starts to work. I think one or both of them are not soldered on mb properly.
They are a 7401 and a E4
I think the best things is replace that two mosfet. It is correct?

[mon2]

Re: Hp probook g1 650 does not charge

I grab a termocamera

Am I the last guy to not have one in the lab ?

I think it will be a great idea to remove all power -> apply flux on each side of each mosfet near the front side where the DCIN adapter is connector -> reflow each mosfet with hot air.

Then allow for the logic board to cool for a few minutes and power up again.

[Stevedb]

Re: Hp probook g1 650 does not charge

Check also the dock connector socket for any liquid damage . I had one where the problem was the dock connector.

[giulio93]

Re: Hp probook g1 650 does not charge

Check also the dock connector socket for any liquid damage . I had one where the problem was the dock connector.

thanks for the advise. I hope I solved the problem. I resold properly a couple of mosfet ( the one I see hot whith the TC), and the pc seams to work fine. The time will give us the answer