Question about Televison & Video
I have a Murphy LCD TV, model TV37F10DM, There is a loud buzzing noise from it when then the programme on the screen goes dark or Black
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: Loud buzzing
check your connections again, if you have the audio and video reversed you will get this exact problem no video/ fuzzy video, and squealy noise out of only one speaker (other will likely sound correct) You're watching the sound channel, and listening to the video channel basically... hehe
Posted on Aug 16, 2007
The main cause off buzzing from these sets is the transformers on the psu. This can be solved by sealing the transformers with a sealant spray.
Posted on Mar 18, 2011
Possible that the main power supply unit which is the SMPS- switch mode power supply- has a faulty capacitor or in the INVERTOR board which has changed the value and so the frequency being changed can cause higher huming level- reduced to lower frequency.
so check the board for leaks , if so replace. Also check if the threshold voltages are below level in these circuits. if so the capacitor can be identified. If there is change after the component heats then simulate the circuit board and confirm using a hair dryer.
Posted on Sep 23, 2011
SOURCE: tv making loud buzzing noise
A common cause are failure of decopling capacitors in the audio section, and or the circuit board power distribution that feeds the audio board. Most of the capacitors are surface mount components. The standard fix is to start by changing the circuit boards that have the defective parts.
If the set is under warranty, call for warranty service. Out of warranty service is expensive for these TV sets.
Posted on Aug 10, 2012
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