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timwebb 2nd January 2012 09:59 PM

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i got this to repair. just looking at it i noticed the output driver card was worked on. but two ic's were replaced and dont know if there right...this is how i got it. u1 and u2 have been changed

timwebb 3rd January 2012 12:28 AM

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i cant find a data sheet on the ic. d3 is shorted, i couldnt find a data sheet on it either.

Perry Babin 3rd January 2012 12:57 AM

The ICs are right (IRS21844S or IR21844S will work).

Did you remove D3 to confirm that it was shorted?

timwebb 3rd January 2012 01:10 AM

no i just tested d1 with diode check and it tested fine. d3 shorted with diode check. u2 also got hot when powered up.

Perry Babin 3rd January 2012 01:21 AM

If the outputs failed, the driver IC that was driving the failed outputs has almost certainly failed as well.

timwebb 3rd January 2012 02:08 AM

i got the amp with no output transistors in it.but from what i see that looks to be the cause.
i can tell by the soldering on the ic's that they have been replaced. some of the solder tabs are missing for the pins that aren't used.

timwebb 3rd January 2012 03:51 AM

d3 is good. im looking for the short now.

Perry Babin 3rd January 2012 10:15 AM

Pins 8 and 14 are likely shorted inside the IC.

Sorry, that' should read, 7 and 14.

timwebb 4th January 2012 12:47 AM

i was looking for a data sheet on the ic but cant find one.

mike49504 4th January 2012 12:55 AM

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