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Old 2nd January 2012, 09:59 PM   #1
timwebb is offline timwebb  United States
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Default groundpounder3000

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
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Old 3rd January 2012, 12:28 AM   #2
timwebb is offline timwebb  United States
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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.
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Old 3rd January 2012, 12:57 AM   #3
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The ICs are right (IRS21844S or IR21844S will work).

Did you remove D3 to confirm that it was shorted?
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Old 3rd January 2012, 01:10 AM   #4
timwebb is offline timwebb  United States
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no i just tested d1 with diode check and it tested fine. d3 shorted with diode check. u2 also got hot when powered up.
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Old 3rd January 2012, 01:21 AM   #5
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If the outputs failed, the driver IC that was driving the failed outputs has almost certainly failed as well.
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Old 3rd January 2012, 02:08 AM   #6
timwebb is offline timwebb  United States
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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.
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Old 3rd January 2012, 03:51 AM   #7
timwebb is offline timwebb  United States
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d3 is good. im looking for the short now.
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Old 3rd January 2012, 10:15 AM   #8
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Pins 8 and 14 are likely shorted inside the IC.

Edit:
Sorry, that' should read, 7 and 14.

Last edited by Perry Babin; 3rd January 2012 at 10:32 AM.
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Old 4th January 2012, 12:47 AM   #9
timwebb is offline timwebb  United States
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i was looking for a data sheet on the ic but cant find one.
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Old 4th January 2012, 12:55 AM   #10
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http://www.irf.com/product-info/data...ata/ir2184.pdf
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