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TDA7498 without any input singal,but it also generate 40KHZ modulating wave output

Question asked by ke.deng.001 on Sep 10, 2014
Latest reply on Sep 10, 2014 by zhao.yuntao
Although there is any input singal,it still generate 40KHZ modulating wave output.
Could tell me what could cause this?
How can i solve this problem?

Testing method as fellow:
Power Supply: 24V/4Ohm
test load: cement resistor(4Ohm/100W)

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