EDIT: Damn, I finally understood the sorting in this forum (took me some time, eh?), so I guess I really am quite off-topic in "Screen Tablet malarky" so... just ignore my problem number 1 and help me with the screen I guess? Sorry for that
First time poster, I hope my question isn't too off-topic (and too long) since I don't build a cintiq or anything wacom related for that matter, but a laptop as a whole. But hey, at least I'll use a wacom tablet externally with this laptop, so at least some correlation?
Anyways, first some data about my parts:
the brain - UP-board w/ 4GB RAM and 32GB eMMC (5V@~1.5A with keyboard and mouse)
the brain extension - mSata Shield with WiFi module (12V@?A - also provides power for the UP-board, but I haven't measured the whole package yet, I'd guess it needs about 2A)
the display & controller board - LP171WU1 TL A7 screen powered by a T.VST59.031 controller board (12V@~1.2A)
now some data about my level of knowledge, so you know at which level you can talk to me
I'm in a school for mechanical, electrical and software engineering, so there are many different (technical) topics about which I don't know that
For the electronics part I know about:
basic electrical principles (Ohm's Law, Kirchhoff's curcuit laws, how capacitors, transistors, resistors work and how I can calculate stuff with them), some stuff about OpAmps, some basic knowledge about AC curcuitry, and how to use various measurement devices (Oscilloscope, Volt- and Ampmeter,...), but thats about it. (I also don't have much practice, so much of this stuff is half forgotten)
Sooooo, right now I have two main problems (for which I desperately
need help, I just don't know what to do anymore) with my laptop build:
Where do I get a proper Li Ion charger from, as well as a power distributor (those things that automatically switch from battery power to external power, I don't really know how they are called). I found some parts for this by Texas Instruments, but they are impossible for me to use due to several reasons: the chip itself is incredible small and has 28 pins and is therefore nearly impossible to solder by hand, it needs an absolute incredulous amount of peripheral electronics aaaaaaaand it does way more than I need it to (eg it also includes every possible type of battery safety, which I plan to include as a pre-built module with the battery and not with the charging controller). Other than that I haven't found any pre-built chargers/distributors which can handle the amount of power I need
. Since I have rather powerful components I have to be able to put 12V at about 3-4A through - and thats not counting possible power hungry peripherals (like a charging mobile phone).
And if there are no pre-built controllers for my use - how do these things work? I really don't want to go datasheet hunting without really knowing the electronical principles behind most of the stuff.
I understand, that I will need some sort of current measurement device, which knows how much power gets into/out of my battery, into my system and how much in total gets into my laptop via the power plug and I know that Li Ion batteries have special charging needs for which I need to be able to switch between constant current and constant voltage mode, as well as do pre-conditioning and voltage maintance - but how do I switch these? And how can I switch fast enough between external power and battery, so that a capacitor can buffer the outage and my board doesn't turn off?
the screen. It. just. doesn't. work. I don't know why. Maybe it's the screen itself. Maybe it's the display controller. I just don't know. The only thing I can see on it is white after about 10 seconds of weird pixel errors, which I think is just because the display controller needs some time to start up, but could also be because of a faulty display. Unfortunately, the laptop the display originated from is absolutely broken (well, now somewhere on the garbage dump), so I can't even check if the display works or not.
Images of the screen booting up (disclaimer: those darker spots are [mainly] not from the camera, this is nearly what the screen actually displays):
directly after bootup
some seconds later
(the images show the whole screen)
The screen slowly gets brighter until it is completely white after about 10 seconds
I am ready to buy a new screen, but if I do this I would like to get the complete package and not have to hack something together (so, no external display controller, just a screen where I can plug my damn HDMI cable in), so if any of you know of any good screens that meet my criteria (preferably 15.6", but 12-17" is okay, FullHD and HDMI or something for which cheap adapters exist) I would be forever grateful, because I can't find such a thing and I could at least use the laptop, just with constant external power.
SSD Shield: http://up-shop.org/home/54-502ssd-msata-solid-state-drive-shield.html
T.VST59 controller board: http://junhengtai.en.alibaba.com/product/60414637756-801852502/T_VST59_031_LCD_Mainboard_Manufacturer_And_Supplier.html