Author Topic: Repair HP Envy touchsmart motherboard  (Read 3883 times)

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Offline hadibou

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Repair HP Envy touchsmart motherboard
« on: November 17, 2015, 09:05:49 am »
Hi guys,

I'm trying to repair and HP Envy 15 motherboard (ref 720566-501) , I found this part in short circuit (red circled part on the pic).

It sits just near the battery connector.

Now the question is, what is it ? a voltage regulator? Is there any cross reference?

I hope get some help here.

Thank you guys.
« Last Edit: November 17, 2015, 09:12:04 am by hadibou »
 

Offline crispy_tofu

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Re: Repair HP Envy touchsmart motherboard
« Reply #1 on: November 17, 2015, 09:11:55 am »
Looks like a Fairchild FDMS8888 - N-channel MOSFET 30V 51A (Discontinued Product  :( )
More: http://au.rs-online.com/web/p/mosfet-transistors/7599658P/
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #2 on: November 17, 2015, 10:44:58 am »
Ohh guy thank you  :-+ it really looks like it is
 

Offline Rasz

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« Last Edit: November 18, 2015, 04:45:16 pm by Rasz »
Who logs in to gdm? Not I, said the duck.
My fireplace is on fire, but in all the wrong places.
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #4 on: November 18, 2015, 07:44:14 pm »
Thank's guy  ^-^

2nd schematic is OK for my motherboard.

The Q6010 ref is AON6414AL and it has almost the same characteristics as the FDMS8888, so I can try on either.

 

Offline Rasz

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Re: Repair HP Envy touchsmart motherboard
« Reply #5 on: November 19, 2015, 01:12:30 am »
before you swap it check for other shorts, for example after removing it  is something shorted to ground around it?
Who logs in to gdm? Not I, said the duck.
My fireplace is on fire, but in all the wrong places.
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #6 on: November 19, 2015, 07:02:04 am »
that's what i'll do, I'm just waiting for a heat gun to desolder it
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #7 on: January 09, 2016, 02:10:50 pm »
Hi again and happy new year plenty of success which is not my case with this board  ;D

I just replaced the Q6010 but unfortunately it got shorted again.

Do you guys have any new idea?

Thank you
 

Offline amyk

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Re: Repair HP Envy touchsmart motherboard
« Reply #8 on: January 09, 2016, 05:55:02 pm »
ESD precautions?
 

Offline Rasz

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Re: Repair HP Envy touchsmart motherboard
« Reply #9 on: January 10, 2016, 07:10:51 am »
thats why I said:
before you swap it check for other shorts, for example after removing it  is something shorted to ground around it?

those mosfets usually dont die on its own, they die because something other was bad and pulled excessive current frying them

Who logs in to gdm? Not I, said the duck.
My fireplace is on fire, but in all the wrong places.
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #10 on: January 10, 2016, 12:13:21 pm »
ESD precautions?

Not as it should be but I do grounding my body from time to time just by touching house outlet ground
« Last Edit: January 10, 2016, 12:25:03 pm by hadibou »
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #11 on: January 10, 2016, 12:55:32 pm »
thats why I said:
before you swap it check for other shorts, for example after removing it  is something shorted to ground around it?

those mosfets usually dont die on its own, they die because something other was bad and pulled excessive current frying them

I didn't not forget what you've already said, but at that time I didn't find any other problem.
Now, I gave it a new check up and I found the pins 1,2 of U6000 grounded so I think that U6000 is dead coz like this PVBAT is grounded too.
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #12 on: January 11, 2016, 12:10:36 am »
I pulled out U6000 but PVBAT still grounded, so it could be any other part.
Do you think that ceramic capacitors could be suspected? Or could you tell which kind of part I have to check up (desolder) first?
 

Offline Rasz

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Re: Repair HP Envy touchsmart motherboard
« Reply #13 on: January 11, 2016, 05:03:35 am »
yes, caps are prone to dying by shorting, 6029 6030 look like good start
did you remove r6000 to check which side is shorted?
Who logs in to gdm? Not I, said the duck.
My fireplace is on fire, but in all the wrong places.
 

Offline hadibou

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Re: Repair HP Envy touchsmart motherboard
« Reply #14 on: January 11, 2016, 10:32:47 am »
Ok i'm gonna give it a try.

What about the powerpads? are them just some solder connectors? can I desolder/resolder them? Because this will help me to disconnect each bloc from PVBAT
 


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