A Sylvania LD320SS8 LCD TV came into the shop that would turn on for a few seconds and then turn off and go back into standby mode. This t...

Here is a great article on X and Y capacitors used in EMI / RFI filter circuits found in SMPS etc. If you have any questions please email ...

Here is a good article on BJT or Bipolar Junction Transistor basics. Read it here at electronics tutorials.ws

Here is a great article on FM Demodulation from tpub.com , enjoy and if you have any questions please email me john@preher-tech.com . FM...

AM DEMODULATION Amplitude modulation refers to any method of modulating an electromagnetic carrier frequency by varying its amplitude in acc...

A VIZIO L32 HDTV came into the shop that would power on, the standby/power LED would go from amber to green and TV had audio but no picture...

Here is a great article I wanted to share with all of you. It will show you how to make your own ESR meter at home. This is a fun project an...

Samsung Syncmaster 906BW, LS19MEWSFY/XAA LCD monitor came into the shop today with no picture(really it was that the back lights were not li...

To learn how I repaired this power supply email johnpreher@gmail.com HPT4254X/XAA,  BN44-00161A Professional Repair: If you are interes...

Have you ever wondered what Ripple Rejection Ratio is? Ripple Rejection Ratio or Power Supply Rejection Ratio (PSRR) is a measure of how wel...