I usually don't start and complete a single work, instead, I work on multiple stuff at the same time, that's why it takes me a long time to do even simple stuff.
This update will be a bit different from the others and not related to the case, anyway, it is a work I did for my PC station.
One day, at 5pm, I had the idea to improve my monitor.
It's an Asus VW220D, 21.6", 1680x1050, which was discarded, almost new, because it had overheating problems;
After a few minutes of usage, it started stuttering and distorting the image, and the chassis would get really hot.
To avoid this problem, I had installed two small fans on the back of it, the modification allowed me to use this monitor up until today, altough with 10% maximum luminosity during the winter, and 0% during the summer.
I grew tired of the situation, and I wanted to use the monitor to its full potential, so I replaced the fans with two better performing ones, reclaimed from a laptop cooling base.
Here starts the dismantling, a really tedious procedure, as there are plenty of hidden clips, hardly reachable.
The fans work on 5 Volts taken from a wire between two PCBs, sadly, the monitor doesn't use 12 Volts, only 2.5 and 5.2.
In the picture, you can notice a hidden screw terminal between the circuit boards.
Here are the old holes, made only with a drill, pliers, hammer and file. Horrible, but they did their job.
New fans positioning...
...and Dremel cuts, drastically better.
To cut the plastic, I used some heavy weaponry.
It has been difficult to make the holes, as the tip could not stay in a fixed position because of the previous holes.
I managed to do it anyway.
Time to reassemble the PCBs, fix the fans in position, and wire them.
I used hot glue to keep everything steady.
It might not be perfectly aligned, but it doesn't matter, it's hidden and it works, and it also allowed me to fit a wire for the next step.
I has some wire mesh laying around, so I glued it for protection.
As everything was still open, I wanted to add a LED strip on the back of the monitor. The problem is that the strips work with 12V, and the monitor outputs 5.2!
Here started the most boring work of all, which is making the strip work with 5V, all while maintaining the same brightness level.
The strip is divided into modules, each of them composed of 3 LEDs and a 150 Ohms resistor, all in series.
With some measuring and calculations, I concluded that each LED wants 3.2 Volts, so I should put them all in parallel, and add a resistor to drop the 5 Volts to 3.2.
To my surprise and luck, I calculated a resistance of 150 Ohms, which is exactly what is already installed on the strip!
Here are the steps I followed on a sample.
Original strip.
Strip cuts to prepare for parallel configuration.
Insulator removal to show the copper strip.
Soldering.
And here they work on 5V.
To not waste the sample, I stuck it in my mouse to see the effect it produces.
It's not bad, but I'd have to rearrange the LEDs and remove a plastic layer, to have a more uniform brightness.
But this will be another work!
The definitive strip for the monitor has been soldered with some wires, as I needed the two copper strips on the sides to be continuous, to feed the whole strip.
I repositioned it on the back instead of on the bottom, to have a better effect.
Here's the final effect, I love the green aura around it! I will probably add a switch to turn them off, as even in low consumption mode they still work.
See you next update