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14th October 2011, 02:26 PM
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#1 |
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diyAudio Member
Join Date: Jun 2010
Location: the caribbean
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DHD NTX2960
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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14th October 2011, 05:36 PM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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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