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TV MAKING A HIGH PITCH BEEP AND SHUTTING OFF AND ON

My sanyo tv 46 inch tv is only 5 months old and just started making a high pitch noise and shutting off ,then comes on with no picture and this goes on and on all my cords are secure and tight and im so stunned i dont know what to do ,can you please help?

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  • tamara martin Jul 21, 2009

    all connections are tight it is starting to freeze up the picture stays froze while the voices keep going?

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I don't know what model you have, but Sanyo tv's are designed with a shutdown after about 3 seconds, if the processor detects a problem. It sounds like the switching mosfet is not running at the right frequency. It should be above your hearing range. That tells me that you have a problem in your power supply that is causing the voltages not to come up to the proper value, and the processor is turning your tv off. If you have a schematic check the circuit around the switching mosfet, capacitors ect. I have had to replace several of their mosfet switching transistors and that was the problem. SANYO, 3333 Sanyo Rd. Forrest city Arkansas 72335 870-633-5030 or e-mail support@sanyotv.com Sanyo is releasing their maintance manuals online try searching for your maintance manual. If you have a reputable TV service center in your area the technicians should be very familar with this problem, and give you a quote before he does any work. It should be a simple fix on the power supply, (if that is the only problem) or if you have a electronic friend, he can replace the mosfet for around $9 just make sure it is the exact same part# because of the error detection in the processor, generic parts won't work. Or try www.sanyotv.com 1-800-877-5032 Their tech support has always been great to me, and I am retired and not a service technician just 45 years of prior experience. I just noticed its only 5 months old and should be under warrenty. call the 800 number and take it to the nearest service center. Hope I helped.

Posted on Jul 25, 2009

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The Backlight Inverter is creating the high pitch noise. This can be the result of a poor ground or loose connection. I would not expect anything failed at this point. I just beleive you have some loose connection really.

Posted on Jul 20, 2009

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