Question about Emerson EWL20S5 20 in. EDTV-Ready LCD Television

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TV was unplugged for a little while and now won't power up and is making a buzzing sound. What can cause this?

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How old is the tv? This is a power supply symptom. You will need to take the back of the tv off and check for puffed capacitors on the power pcb. This is the board where the power cord plugs into. Lay tv face down on a cushioned surface large enough to support the tv frame. You do not want to damage the panel. Then remove the back. If there are puffed capacitors, replace them with equal or slightly higher valued capacitors. The value rating for capacitors are mf and voltage, printed on the capacitors. If they look good, you will need to check the dc voltage output from the pcb usually about three connectors in the same area. One way or another, it is a power supply problem, usually corrected by replacing caps, but if that doesn't work, you will need to replace power pcb

Posted on Apr 03, 2011

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If picture and sound is Ok, and only this buzzing sound is heard from the back of the TV, It should be due to core soose of some ferrite cored transformers inside, especially to the power supply regulator board of the TV. Open the back cover of the TV and swtich it ON. Listeen very carefully which transfromer makes the buzzing noise. Just trouch and press the core of the transformer suspected with some non-cunductive material like glass rod, or a stick of dry wood. You can identify the transformer that makes noise by this way. After identifying the exact transformer; switch OFF the set, unplug it from mains socket, apply some "Super Glue" like fast boanding glue to the joint of core of that transformer. Allow sometime for the glue to set. This will solve the buzzing sound problem of your TV. OK

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Replacing a flyback is not something I would suggest for anyone with no electronics experience. Second, lets see where the noise is coming from first. Take off the back and listen to the noise. The flyback will be at one end of the large red wires that go to the tubes. Sometimes the connection at the tube is not 100% and the noise comes from there. BE CAREFUL - there are high voltages going through this red wire that can be dangerous even with the set UNPLUGGED!! IF the noise is coming from the connection at the tube, with the set unplugged, carefully turn the rubber cap back and forth touching only the rubber part with one hand. Put the other hand in you pocket while doing this.

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Quasar 1989 tv makes a buzzing motor sound


Hi and welcome to FixYa,

Initially, if you have confirmed that the source of the buzzing sound is from inside the TV, then that would indicate a component about to fail or would need attention. Let us try process of elimination:
  • tuner - most unlikely, the tuner is responsible for selecting the channel. No component/part of the tuner could make such a mechanical buzzing sound;
  • speaker(s) - most unlikely, the speaker could have a buzz but generally would not affect the video nor cause snow (weak TV signals);
  • transformer - a strong possibility although without knowing the exact model, at most generic ideas; power transformer, flyback transformer, horizontal drive transformer (unlikely);
  • arcing - another strong possibility. This could be caused by damp, dusty surroundings of the components especially at the FBT area. Another area that could have adverse effect when dusty/damp would be the anode cap.
This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

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