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About cleggsan
Expertise
Consumer Electronics of all kinds. Audio, esoteric audio systems and components, video, tv. Digital equipment for consumer use. Ham radio and automotive electronics. Note: I give advice on tv repair based on general consumer electronics engineering experience but I am not engaged in actual repair of sets. MAKE SURE YOU GIVE THE MAKE AND MODEL NUMBER AND AGE OF THE SET.
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Electrical Engineering; recording, broadcasting, design, international standards, tv and radio theory and practice.
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FELLOW of AES (Audio Engineering Society)
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Famous Engineer for Digital Audio
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You are here: Experts > Home/Garden > Home Appliances > TV/VCR/Stereo Troubleshooting > Toshiba 51H84
Expert: cleggsan - 11/8/2009
Question
I just bought this TV from a friend today. The audio has a continuous almost thumping sound. It sounds as if the speaker is continuously vibrating. The sound does get louder the louder you turn the tv up. Please help.
Thanks!
Answer
But, does the thumping sound stop when the volume is reduced to zero?
IF NO: The problem may be what is called "motorboating" and is mostly caused by an instability from the power supply that is feeding the audio amplifier.
IF YES: The problem may be related to a bad speaker that has a damaged mounting of the cone and the thumping is caused when the audio program or music gives too much power and causes the cone to rub or bounce off the internal parts of the mechanism.
I need to know your take on the sound after you have considered the comments above. If it continues to wobulate in both channels regardless of the position of the volume control please explain it in detail. If it goes up and down with the volume control setting tell me if it changes in frequency or pitch, etc.
Thank you.
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