DIY CIRCUITS ELECTRONICS

a new video showing how i test the led bars of a tv & how to find which led is damaged. in this video im using a small device i made long time ago that allows me to inject voltage to a led or led bar and see if it is working. video of this device and how it is made in this link here

a very common fault on many philips televisions with the CHASSIS AA5 AB watch the video for details about the repair..

in this video im fixing a samsung led tv with purple spots and purple picture. also we will see what causes the purple spots to appear on the screen and why the picture looks kinda purple... if you liked this video or helped you, consider making a donation or at least subscribe to my channel. it really helps... thanks!!

another repair..this time is an LG HOME CINEMA that was dead.no power at all.the model is HT762TZ. the repair is relatively easy if you replace the components shown in the video. if you liked this video or helped you in some way consider making a donation using the donate link on the upper right corner or at least subscribe to the channel.

another common symptom in many tv's that use the vestel power supply.this time is an f&u tv but you may find the same power supply board in many other brands such as philips , hitachi, turbo-x, jvc, and more...the psu board is made by vestel and the part no is 17ips61-3.

another common fault in many lcd tv sets.this one is for the samsung LE20S81BX/XEH but this kind of failure you will find it in other models and brands too. in this video im showing you how i fixed this tv and how to remove and replace bad components. if you liked this video or helped you consider making a donation (any amount) to help the channel grow.

today im showing you how i usually disassemble a laptop battery pack to harvest or salvage the 18650 li ion batteries that are inside.also you must measure the voltage of each battery to get an idea if the battery you salvaged is in good condition, although further tests should be done to determine that. most of the times if a battery is discharged below a point,usually 2.5v is the lower limit in some batteries then it will probably be damaged. this way i have always batteries to use in various electronics projects. please be extra carefull when ''playing'' with li-ion or li-polymer batteries beacuse they might overheat or explode if shorted,puntured e.t.c. also use gloves if you see signs of leakage. if you liked this video and helped you consider making a donation (any amount) to help the channel grow.

  new type lg tv led bars - repair - comparison with older ones. in this video im sharing a new kind-type of led bars i found in a tv set brought for repair. the reason for posting this video is that its the first time i see led bars-arrays with large oval diffusers instead of the commonly cyclic. also the new ones (original) had bigger aluminum pcb obviously for better heat dissipation. in this case the symptoms were: blue spots in various areas of the screen , and in some other cases completely blue-purple picture. ------------------------------------------------------------------- if you liked this video and helped you consider making a donation (any amount) to help the channel grow. https://paypal.me/e4all?locale.x=en_US

in this video im showing how i wired my 9501 (T12) soldering iron i bought sometime ago and came as a kit.  caution!! the connector wiring shown in this video might be not compatible with your soldering station so please dont think that this wiring is universal. check your station pinout first or you may damage something.

new project - video ATmega SolderingStation in this video im presenting a soldering station i built that takes advantage the quick heating t12 tips. it uses very cheap components that are easy to find.you may built it either using an arduino or using an atmega chip,pcb & firmware provided in the project page. schematics-firmware-pcb and info here https://easyeda.com/wagiminator/z-sol... this video is NOT sponsored by any company.i just built it and if anyone is interested can built it too since it is open source. soon im going to make a second video showing the menus and calibration procedure with more details.

this is a very usefull circuit if you're building projects powered by batteries.this simple circuit informs you when the battery needs to be recharged by turning on a led.the threshold is set to the desired voltage by a multiturn potentiometer. the only thing you should have in mind is that it doesnt work with red led's,at least with the ones i tryied. i think it has something to do with the very low voltage that red led's need to lit.didnt have the time to experiment further.besides that,the circuit works perfect. components needed: R1= 1k (2,2k if you use smd led) R2= 2.2K U2= TL431 adjustable shunt regulator(can be found very easy in power supplies) PR1=10K potentiometer (for higher precision use multiturn)  LED1= led (not red-didnt work with me) here is a video building it.

a very usefull circuit for every tv technician. this device provides the various voltages we need to test backlight led arrays or single led's.

watch how i assembled a diy power bank kit bought from e-bay.the case can hold 5 batteries 18650 wired all in parallel.the case includes the pcb for the power bank and the casing.(no batteries included).you have to use your own batteries.

inspecting a common failure in many professional speakers.teardown of DYNACORD F150. A very succesfull speaker for many years and very reliable..i managed to find 2 different faults.