Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Laptops, Portable, and Mobile Devices
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 05-05-2020, 07:36 AM   #1
CornholioGSM
Member
 
CornholioGSM's Avatar
 
Join Date: Feb 2014
City & State: Prague
My Country: CZECH
I'm a: Knowledge Seeker
Posts: 61
Default HP 450 G5 (da0x8cmb6e0) - keyboard problem

Hello,
i have here ex water smashed 450 g5 with mainboard da0x8cmb6e0.
Water was mainly on and around kbc npce586ha2mx.
KBC was desoldered, all cleaned and soldered back...on leg was repaired under microscope.
Problem is, that some keys on kb wont work correctly - for example when i press "O" laptop turns on airplane mode.
...problem still with connected external keyboard. at first it seemed like keyboard problem...but i have tested another two 100% working keyboards and problem still.
When is internal keyboard disconnected and is connected only usb kb then all works fine.

I was not able to find service manual for this laptop.

Soo what you mean? is needed to change kbc npce586ha2mx ?

thx

Last edited by CornholioGSM; 05-05-2020 at 08:56 AM..
CornholioGSM is offline   Reply With Quote
Old 05-05-2020, 08:56 AM   #2
emestee
Member
 
Join Date: Dec 2019
City & State: Sofia
My Country: Bulgaria
I'm a: Hobbyist Tech
Posts: 71
Default Re: HP 450 G5 - keyboard problem

The keyboard connector data lines go directly to the EC. You may want to test them one by one. Find schematics for a board with the same EC, keyboard lines are defined by EC hardware and pinout doesn't change between boards.

Another alternative would be something silly like Fn function being on by default.
emestee is offline   Reply With Quote
Old 05-05-2020, 08:58 AM   #3
CornholioGSM
Member
 
CornholioGSM's Avatar
 
Join Date: Feb 2014
City & State: Prague
My Country: CZECH
I'm a: Knowledge Seeker
Posts: 61
Default Re: HP 450 G5 - keyboard problem

...this ec is needed to be programmed or can i use directly another desoldered from another mainboard?
CornholioGSM is offline   Reply With Quote
Old 05-05-2020, 09:42 AM   #4
emestee
Member
 
Join Date: Dec 2019
City & State: Sofia
My Country: Bulgaria
I'm a: Hobbyist Tech
Posts: 71
Default Re: HP 450 G5 - keyboard problem

Quote:
Originally Posted by CornholioGSM View Post
...this ec is needed to be programmed or can i use directly another desoldered from another mainboard?
If I remember correctly from seeing it elsewhere, but dont quote me on it, it's self-programming - a blank EC would load its firmware from a SPI flash and store it internally. Quick google suggests it has nasty security features too.
emestee is offline   Reply With Quote
Old 05-05-2020, 09:49 AM   #5
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 4,948
Default Re: HP 450 G5 - keyboard problem

Quote:
Originally Posted by emestee View Post
If I remember correctly from seeing it elsewhere, but dont quote me on it, it's self-programming - a blank EC would load its firmware from a SPI flash and store it internally. Quick google suggests it has nasty security features too.
https://www.ssi.gouv.fr/uploads/2017...-2017_22en.pdf

Edit: website in french language: https://www.ssi.gouv.fr/entreprise/c...-npce576ha2yx/

Does it mean it can only be replaced with one from a donor board .

Last edited by SMDFlea; 05-05-2020 at 09:55 AM..
SMDFlea is offline   Reply With Quote
Old 05-05-2020, 09:56 AM   #6
emestee
Member
 
Join Date: Dec 2019
City & State: Sofia
My Country: Bulgaria
I'm a: Hobbyist Tech
Posts: 71
Default Re: HP 450 G5 - keyboard problem

Quote:
Originally Posted by SMDFlea View Post
https://www.ssi.gouv.fr/uploads/2017...-2017_22en.pdf

Does it mean it can only be replaced with one from a donor board .
I don't think so. If anything, installing a programmed one from a donor board is probably a bad idea if it has security features enabled. There's simply no documentation on it. The russian engineers claimed to have made some progress, JTAG was mentioned but it's hush hush so far, so we don't have any data. There are supposedly EC dumps but I dont have access to them.

Edit: upon some more googling tl;dr this EC is bad news. It is presumed to have unique OTP programming keys and so nothing to be done with it except replacement from an identical donor.

Last edited by emestee; 05-05-2020 at 10:01 AM..
emestee is offline   Reply With Quote
Old 05-05-2020, 10:12 AM   #7
emestee
Member
 
Join Date: Dec 2019
City & State: Sofia
My Country: Bulgaria
I'm a: Hobbyist Tech
Posts: 71
Default Re: HP 450 G5 - keyboard problem

Ok here's some good news. The previous revision of this machine (Quanta X93A) has the same KBC. There's a reported case on russian forums where this KBC was successfully replaced with the 781 variant, and the bios was replaced with 25q80 or 25q128. The flashed BIOS was the official one with serial numbers copied from the original.

Source (Russian): http://********/viewtopic.php?f=53&t=80018
emestee is offline   Reply With Quote
Old 05-05-2020, 03:17 PM   #8
CornholioGSM
Member
 
CornholioGSM's Avatar
 
Join Date: Feb 2014
City & State: Prague
My Country: CZECH
I'm a: Knowledge Seeker
Posts: 61
Default Re: HP 450 G5 - keyboard problem

soo what will be the simplest solution? buy new one from ali etc...then it will be self programmed from spi?
CornholioGSM is offline   Reply With Quote
Old 05-06-2020, 02:58 AM   #9
emestee
Member
 
Join Date: Dec 2019
City & State: Sofia
My Country: Bulgaria
I'm a: Hobbyist Tech
Posts: 71
Default Re: HP 450 G5 - keyboard problem

I would highly suggest you prove affirmatively that this is a KBC issue before trying to replace it.
emestee is offline   Reply With Quote
Old 05-31-2020, 03:00 PM   #10
CornholioGSM
Member
 
CornholioGSM's Avatar
 
Join Date: Feb 2014
City & State: Prague
My Country: CZECH
I'm a: Knowledge Seeker
Posts: 61
Default Re: HP 450 G5 (da0x8cmb6e0) - keyboard problem

*SOLVED*
...i have found mainboard from 470 G5 ( 17" version with dGPU). ...soo i have changed kbc from this mainboard and all works fine without programming
CornholioGSM is offline   Reply With Quote
Old 05-31-2020, 10:48 PM   #11
mcplslg123
Badcaps Veteran
 
Join Date: Jun 2015
City & State: siliguri
My Country: india
Line Voltage: 220vac,60hz
I'm a: Professional Tech
Posts: 2,869
Default Re: HP 450 G5 (da0x8cmb6e0) - keyboard problem

Quote:
Originally Posted by CornholioGSM View Post
*SOLVED*
...i have found mainboard from 470 G5 ( 17" version with dGPU). ...soo i have changed kbc from this mainboard and all works fine without programming
Was the mb number same in 450 G5/470 G5??
mcplslg123 is offline   Reply With Quote
Old 06-01-2020, 02:33 AM   #12
CornholioGSM
Member
 
CornholioGSM's Avatar
 
Join Date: Feb 2014
City & State: Prague
My Country: CZECH
I'm a: Knowledge Seeker
Posts: 61
Default Re: HP 450 G5 - keyboard problem

nono little different...give me few hours i will post it
CornholioGSM is offline   Reply With Quote
Old 06-01-2020, 10:28 AM   #13
CornholioGSM
Member
 
CornholioGSM's Avatar
 
Join Date: Feb 2014
City & State: Prague
My Country: CZECH
I'm a: Knowledge Seeker
Posts: 61
Default Re: HP 450 G5 - keyboard problem

...sorry my error...mainboard was same mb number - only with dGPU
CornholioGSM is offline   Reply With Quote
Old 06-01-2020, 11:02 PM   #14
mcplslg123
Badcaps Veteran
 
Join Date: Jun 2015
City & State: siliguri
My Country: india
Line Voltage: 220vac,60hz
I'm a: Professional Tech
Posts: 2,869
Default Re: HP 450 G5 - keyboard problem

Quote:
Originally Posted by CornholioGSM View Post
...sorry my error...mainboard was same mb number - only with dGPU
Hmm. So that leaves us still confused whether this kbc can be replaced from different mb. Will try to dig it and update if anything interesting found. I've not replaced this kbc so far and that's why want to know more.
mcplslg123 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2020
Powered by vBulletin ®
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 09:04 PM.
Did you find this forum helpful?