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

 
Thread Tools Display Modes
Old 07-03-2022, 07:58 AM   #1
ss45
Senior Member
 
Join Date: Jun 2019
City & State: Brazil
My Country: Brazil
I'm a: Knowledge Seeker
Posts: 117
Default HP spectre x360 possible missing components near bios chip

Hi guys anybody has hires picture of this model surrounding bios chip ?
HP spectre x360 i7 8550u not gem cut I guess 2018 or 2019 model

Thanks
Picture attached
Attached Images
File Type: jpg 20220703_225601.jpg (379.3 KB, 15 views)
ss45 is offline   Reply With Quote
Old 07-03-2022, 08:08 AM   #2
mon2
Badcaps Veteran
 
mon2's Avatar
 
Join Date: Dec 2019
City & State: Windsor, Ontario
My Country: Canada
Line Voltage: 110VAC
I'm a: Knowledge Seeker
Posts: 4,118
Default Re: HP spectre x360 possible missing components near bios chip

While waiting, consider to remove all power -> meter in resistance mode.

Check the resistance from each pad of concern and trace it to the BIOS chip pins.

Create a small schematic / block diagram of which pins mate with which pad.

Then download the datasheet for the bios chip and compare notes on the function of the IC. The missing parts could be just current limit resistors or perhaps despiking caps, etc.

The BIOS chip is a digital memory device so very little external parts are required for its operation.

Post the details if you proceed.
mon2 is offline   Reply With Quote
Old 07-03-2022, 08:30 AM   #3
ss45
Senior Member
 
Join Date: Jun 2019
City & State: Brazil
My Country: Brazil
I'm a: Knowledge Seeker
Posts: 117
Default Re: HP spectre x360 possible missing components near bios chip

Looks like they each connects cs clk and di
Attached Images
File Type: jpg 20220703_232855.jpg (37.3 KB, 6 views)
File Type: jpg 20220703_232752.jpg (225.7 KB, 11 views)
ss45 is offline   Reply With Quote
Old 07-03-2022, 08:40 AM   #4
mon2
Badcaps Veteran
 
mon2's Avatar
 
Join Date: Dec 2019
City & State: Windsor, Ontario
My Country: Canada
Line Voltage: 110VAC
I'm a: Knowledge Seeker
Posts: 4,118
Default Re: HP spectre x360 possible missing components near bios chip

Ok. Are the pads with the missing parts - shorted to each other ? Sometimes, PCB designers will apply pads but not use them and they just short them across the pads.

Confirm this. If not, these are just current limit resistors.

You can apply 0 ohm (ie. solder blobs) or a low resistance value to stop signal ringing - we like to use 33 ohms in our designs.

Nothing critical here. The parts look to be 0402 sized pads so you can find donor parts from other boards.

Values that can work here are 0 ohms..1k should be fine. Lower is better.
mon2 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 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 04:03 PM.
Did you find this forum helpful?