Sparkpen to discharge capacitors safely

A suitable tool to safely discharge capacitors is needed when you want to work with circuits that have dangerous voltages inside them. Typical examples of such devices mains powered switch mode power supplies (you need to safely discharge main capacitor) and different cameras (the flash unit has a large capacitor charged to 400-500V voltage). Those

Lumia 920 service tips and manual

Need to fix your Nokia? I have published earlier several tips on fixing Nokia phones, for example fixing N73 and Lumia 800. Here is something fore the newest Lumia phone owners: How to take the Nokia Lumia 920 apart – for the DIY crowd Here is another video that shows how to replace the battery

ESR meters

One way to test electrolytic capacitors is to measure their capacitance. It does not tell the whole story of capacitor condition. Another usually more useful way to measure electrolytic capacitor condition is to use an ESR meter. EEVblog #365 – ESR Meter Bad Cap Monitor Repair video gives you tips how to use ESR meter

How To Save Your Phone From Water Damage

Washing machines, toilets, baths, cups of tea, beer pint, the rainy weather… these are a few of our favourite ways to ruin a smart phone. How to save a wet mobile phone – and what not to do and How to Save a Wet Cell Phone articles tells that usually you don’t need to panic

Heat shrink tubing

Heat-shrink tubing can be thought of as the duct tape for electrical wiring on the factory floor. Can you name all of its uses? Think of heat-shrink tubing as the duct tape for electrical wiring on the factory floor. It can be used for preventive maintenance to avoid problems, and it is a wonderful tool

How to remove and re-attach LCD Ribbon

How to remove and re-attach LCD Ribbon from a PCB with a Fine Pitch article describes one method how to repair broken LCD ribbon cable connection. According the article the repair of LCD ribbon is a hard and delicate process, but can be rewarding if it goes well. If you have a device with LCD

Nokia smartphone repair: Lumia 800

Nokia Lumia 800 smart phone has display got broken. What to do? A real goldmine for anyone attempting to star repairing a cell phone nowadays are disassembly/assembly videos on Youtube. So I got there and looked for Lumia 800 related videos to see if anything could be done for this. Nokia Lumia 800 Teardown –

The ‘slap method’ for through-hole rework

Soldering is an art. With practice, one can learn to easily assemble complex circuits. When you make mistakes you need to do rework, which is usually quite time consuming with through-hole parts. The solder must be completely removed pin-by-pin and the vias cleared of solder before a new part can be installed. The ‘slap method’

How One Teacher Built a Computer Lab for Free article How One Teacher Built a Computer Lab for Free tells an interesting story. The problem? An underfunded school needed computers for the classroom. Budget? $0. How One Teacher Built a Computer Lab for Free article tells how just one sixth-grade teacher got those computers at that budget. In 2007, Robert acquired 18 donated