power issues

TV powers up splash screen is OK then a buzz sound on the power board at the led driver section and it shuts off. Have replaced the power board, main board and ir control board. Can't find a service manual to determine what's up...hoping someone here can help with diagnosing the problem or where...

Hoping that wise heads can give me some steps that I might try to try and bring my desktop PC back to life? I was just using a browser when the screen when black, the monitor went to its power saving mode and didn't come back to life as it normally would when I move the mouse. I then had to...

Hey, so recently ( yesterday) I disassembled my HP Pavilion g6 for cleaning and to apply a new layer of thermal paste. Everything went well and i applied the new layer of thermal paste. I re assembled the laptop and when pushed the power button, it wouldn't power on. I disassembled it and made...