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Old 14th October 2011, 02:26 PM   #1
ian33 is offline ian33
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Join Date: Jun 2010
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The pwm ic tl494 goes bad after one month.I have replace it three times.apart from the 494 i have never find any othe bad parts in the amp.when it goes bad i get 9v on almost all the pins of the 494.There is an othe small ic next to it 4558d this time i will replace them both to see what happen.Any idea what elce could cause the tl494 to just fail like that?
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Old 14th October 2011, 05:36 PM   #2
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
If you have more than a few thousandths of a volt on pin 7, there is an open trace or a bad solder connection. That's the ground for the IC and will nearly always be connected directly to the amp ground.
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