Author Archives: Brad331

Matebook X Pro Teardown

The only heatsink in this laptop is this big metal plate. In most laptops, a fan or two blow directly through a stacked-fin heatsink in a process called forced convection cooling. In the X Pro, heat spreads across the metal plate with the heatpipes' help, warming up the air inside the laptop. The small fan exhausts all this hot air and brings in new cool air using negative air pressure. It also generates some, but not enough, airflow across the heatsink plate.

The miserably small fan can spin at nearly 9,000 RPM, but the bar under it (where a heatsink with fins would usually be) is just one of the WiFi antennas.

The fan is the model BAZA0504R5H made by Asia Vital Components and rated at 5V 0.5A. This means it could theoretically use 2.5W when spinning at max speed.

Look at how thin the fan is!

The copper base plate for the CPU.

Behind the keyboard is a pyrolytic graphite sheet to spread heat more evenly across the keyboard area.

See the motherboard with the heatsink off. The Nvidia MX150 GPU gets a thermal pad as if it were an Intel iGPU.

The back of the motherboard is covered with a plastic insulator film.

This is the motherboard's back with the plastic film removed.

The Nvidia MX150 (1D12 10W version) and its VRAM.

The motherboard has good component density. It's also the thinnest I've seen. The coil whine is insane on my unit.

The pop-up webcam's bottom and the springs for reducing the display cable's slack.

The WiFi card (Intel AC-8275) is non-replaceable.

Although the SSD is awkwardly under the heatsink, it can be wiggled straight out. I bought my X Pro on Taobao.com in China and it came with with a Samsung PM981.

The speakers under the speaker grill are tiny tweeters.

The tweeters fire upward through the grill, and they have a thin fabric filter cover.

Most of the sound comes from the bottom-facing speakers instead, which have much larger enclosures.

There is a cavity on each side of the touchpad, underneath the battery. They're not quite big enough to fit extra battery cells or thick enough for the speaker enclosure to extend into it. Poor use of space? A little bit.

Unlike the MateBook X, there are no screws under the rubber feet. Instead, there are many plastic tabs that hold the back plate firm.

The back cover has many foam pads that press against the internals.

  1. Unscrew the screws.
  2. Use a guitar pick or similar tool to feel, locate, and lift the tabs.
  3. Pull the hinge side of the back plate first.
  4. No need to be gentle with the middle tab—it's spring loaded.
  5. The tabs near the touchpad side like to be slid out.

If your touchpad is loose or rattles, read this.

If you want to get rid of throttling and unlock more performance, read this.

HE400i EQ: Back to Basics

New version here

Introduction

After a year of listening to my HE400i with the previous equalizer settings I made, I decided to use a less aggressive version that only corrects the obnoxious treble peaks and compensates for the sub-bass deficiency.

Measurements and Correction

As always, the greatest appreciation goes to Solderdude at diyaudioheaven.wordpress.com. Just like last time, the measurements come straight from Solderdude’s home-made measuring rid, which I find exceedingly accurate. Check out his measurement methodology here and join the conversation at the DIYAH forum.

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Logitech Options Update Breaks Smooth Scrolling

Problem:

Updating Logitech Options to version 6.70.1055 (Aug 31) made smooth scrolling in Windows 10 apps (such as Edge) extremely unresponsive. Version 6.70.1197 (Sep 14) does not address this issue.

Workaround:

If you have the same problem, please help raise awareness on the Logitech Community thread.

Meanwhile, you can uninstall the new version and reinstall version 6.62.210 from Logitech’s websitehttps://download01.logi.com/web/ftp/pub/techsupport/options/Options_6.62.210.exe

Wanhao i3 0.9° Extruder Motor Mod

My Wanhao i3 (Monoprice Maker Select V2) has the Flexion Extruder upgrade, but I still wanted more extruder torque (trouble pushing through 0.3mm nozzle), so I changed the extruder motor to a longer 17HM15-0904S stepper motor. Why would I use a stepper motor with a step angle of 0.9 degrees as the extruder? I simply had it lying around waiting to be used for an ongoing custom printer project.

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Super-Efficient Start G-Code for Wanhao i3

Here’s the most time-efficient start G-code I’ve come up with so far.

  • The bed and nozzle heat up at the same time, but the bed has a 50°C head start so that they reach target temperature at around the same time.
    • (The Wanhao Duplicator i3’s power supply handles this just fine.)
    • I use 220°C nozzle and 70°C bed for my PLA initial layers. You can change that S50 to something else to fit your temperature settings.
  • The axes are homed during heating.
  • This way, no time at all is wasted and the print starts the fastest.
  • Use a skirt because this start G-code does not include its own nozzle priming.
M190 S50 ;wait for 50C bed temp
M107 ;start with the fan off
M104 S{material_print_temperature_layer_0} ;set extruder temp
M140 S{material_bed_temperature_layer_0} ;set bed temp
G21 ;metric values
G90 ;absolute positioning
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G92 E0 ;zero the extruded length
M109 ;wait for extruder temp
M190 ;wait for bed temp

This G-code is written for the Wanhao i3, in the Repetier flavor, but you can probably use it with little to no modification on other systems. If you know how to use a subtract operator on that “material_bed_temperature_layer_0”, please show us how in the comments. Thanks!

Changelog:

Aug 11, 2017: Added the zero extruder command that I forgot earlier.

The 2017 iPad Pro Is a Seriously Underappreciated Work of Engineering

When we look past the debate about whether iPad can replace your laptop, we may realize just how well-engineered the 2017 iPad Pro is. It is, without a doubt, the most overkill device ever made to run a mobile operating system.

Processing Power

Graph courtesy of 9to5mac.com

The iPad Pro’s A10X Fusion chip approaches the highest-spec 13″ MacBook Pro’s Intel i7 7567U in CPU benchmarks and beats it in a number of GPU benchmarks while having about a third of its power rating. If it weren’t for iOS, the iPad Pro could be whizzing through Final Cut Pro X. Right now, it’s limited to obliterating the iOS version of iMovie.

Audio

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