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Old 14th July 2010, 08:11 PM   #21
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Which diodes?
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Old 14th July 2010, 08:17 PM   #22
timwebb is offline timwebb  United States
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and the 12v pin on the 494 is the one that was heating the chip up.
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Old 14th July 2010, 08:58 PM   #23
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Remove the power supply FETs and power the amp up. Does the IC still get hot?
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Old 14th July 2010, 09:00 PM   #24
timwebb is offline timwebb  United States
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i took them out before i powered up the first time all power supply and output fets are out.
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Old 14th July 2010, 09:08 PM   #25
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Do you possibly have any solder bridges between the pads on any pads you've soldered or desoldered?

Does the IC have 5.0v on pin 14?
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Old 14th July 2010, 09:45 PM   #26
timwebb is offline timwebb  United States
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the voltage on 14 was 10.4 and pin 13 started smoking
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Old 14th July 2010, 09:56 PM   #27
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If pin 7 was grounded and there was 10v on pin 14, it's almost certainly defective. The only possible way it's not defective is if 10v was being driven back into pin 14. I'd suggest replacing it.
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Old 14th July 2010, 10:01 PM   #28
timwebb is offline timwebb  United States
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Quote:
Originally Posted by Perry Babin View Post
If pin 7 was grounded and there was 10v on pin 14, it's almost certainly defective. The only possible way it's not defective is if 10v was being driven back into pin 14. I'd suggest replacing it.
what should i check when replacing the chip?
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Old 14th July 2010, 10:17 PM   #29
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You could power it up without the chip and confirm that the 10v on pin 14 is gone.
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Old 15th July 2010, 03:07 AM   #30
timwebb is offline timwebb  United States
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pin 13 still has 11.54v on it with the 494 out of the circuit? i traced it back to a a1266 transistor and two legs have 11.35v on it.

Last edited by timwebb; 15th July 2010 at 03:33 AM.
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