This guide, Laptop Motherboard Failure Analysis Matrix , presents a failure-analysis table that links common laptop motherboard problem areas (subsystems) to the components most likely to fail and their typical causes. Here is a cross-checking combi…
Some charging faults are obvious. A shorted MOSFET, an open fuse, a damaged DC jack. This HP 14-dy0505 was none of those. What initially appeared to be a failed charger IC evolved into a complex power sequencing fault where a collapsed internal bias…
Lately, my working Arduino Nano started to overheat, and the ICs on it became very hot when connected via USB. I don’t know the reason. In fact, I now have two Arduino Nanos that are not working anymore. The other one does not have the overheating …
About three years ago, I built and manufactured a DIY Arduino board with a custom PCB design. I created the schematic and PCB layout myself and had it fabricated by NextPCB . They were generous enough to manufacture and provide the board free of cha…
I am learning how to repair Ubiquity Lite AP 120 radio . Yesterday I wrote note on how to check for bad capacitor on the PCB of the radio. I came across a diode which showed continuity between its terminal. And so today I wanted to write a note on…
I bought couple of Repairing Ubiquiti Lite AP 120 but they are all malfunctioning. One started to malfunction just after 3 to 4 months. Then I bought another and that 2nd radio antenna also got malfunctioning, also after using it after 5-6 months. …
I have been writing about various components and ICs found on the dell laptop motherboard. Following the powering sequence outlined in the note how laptops and PCs start up? I started taking note from the DC power input circuit to the I/O controlle…
Here I want to write note on the DDR3 (Double Data Rate 3) SDRAM (Synchronous Dynamic Random-Access Memory) used in the dell laptop. There are two slots for inserting the DDR3 SDRAM and they are connected directly to the Ivy/Sandy Bridge Intel CPU …
