Repair HP Envy touchsmart motherboard - Page 1
Forum section: electronics / repair

author: hadibou
author_rank: Newbie
timestamp: November 17, 2015, 09:05:49 am
content: 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.

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 17, 2015, 09:11:55 am
content: Looks like a Fairchild FDMS8888 - N-channel MOSFET 30V 51A (Discontinued Product)More:http://au.rs-online.com/web/p/mosfet-transistors/7599658P/

author: hadibou
author_rank: Newbie
timestamp: November 17, 2015, 10:44:58 am
content: Ohh guy thank youit really looks like it is

author: Rasz
author_rank: Super Contributor
timestamp: November 18, 2015, 04:35:22 pm
content: http://www.alexlaptoprepair.com/wp-content/uploads/2014/02/HP-Envy-15-Quanta-SP7-Laptop-Schematics.pdfcuriously silkscreen doesnt match the schematicedit: its because they second sourcehttp://kythuatphancung.vn/download/hp-envy-touchsmart-15-inventec-15sbgv2-laptop-schematics.html?dl

author: hadibou
author_rank: Newbie
timestamp: November 18, 2015, 07:44:14 pm
content: Thank's guy2nd 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.

author: Rasz
author_rank: Super Contributor
timestamp: November 19, 2015, 01:12:30 am
content: before you swap it check for other shorts, for example after removing it is something shorted to ground around it?

author: hadibou
author_rank: Newbie
timestamp: November 19, 2015, 07:02:04 am
content: that's what i'll do, I'm just waiting for a heat gun to desolder it

author: hadibou
author_rank: Newbie
timestamp: January 09, 2016, 02:10:50 pm
content: Hi again and happy new year plenty of success which is not my case with this boardI just replaced the Q6010 but unfortunately it got shorted again.Do you guys have any new idea?Thank you

author: amyk
author_rank: Super Contributor
timestamp: January 09, 2016, 05:55:02 pm
content: ESD precautions?

author: Rasz
author_rank: Super Contributor
timestamp: January 10, 2016, 07:10:51 am
content: thats why I said:Quote from: Rasz on November 19, 2015, 01:12:30 amthose mosfets usually dont die on its own, they die because something other was bad and pulled excessive current frying them

author: hadibou
author_rank: Newbie
timestamp: January 10, 2016, 12:13:21 pm
content: Quote from: amyk on January 09, 2016, 05:55:02 pmNot as it should be but I do grounding my body from time to time just by touching house outlet ground

author: hadibou
author_rank: Newbie
timestamp: January 10, 2016, 12:55:32 pm
content: Quote from: Rasz on January 10, 2016, 07:10:51 amI 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.

author: hadibou
author_rank: Newbie
timestamp: January 11, 2016, 12:10:36 am
content: 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?

author: Rasz
author_rank: Super Contributor
timestamp: January 11, 2016, 05:03:35 am
content: yes, caps are prone to dying by shorting, 6029 6030 look like good startdid you remove r6000 to check which side is shorted?

author: hadibou
author_rank: Newbie
timestamp: January 11, 2016, 10:32:47 am
content: 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