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Old 20th January 2014, 07:32 PM   #21
srinath is offline srinath  United States
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Oh, I found that chip. its in accessible to test with the amp still assembled.
That Connection 81 was the way to go.
Cool.
Srinath.
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Old 20th January 2014, 07:39 PM   #22
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Hi,
If you follow the signal path for the PRV it will take you to pin 65 to the MAIN CPU IC3 made by MICOM Part number HD54F3337YF15. It is the large IC in the middle of the page.
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Old 20th January 2014, 07:44 PM   #23
srinath is offline srinath  United States
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Pin 65 is connected to middle pin of #81.
2v dc flash at startup = bad I think, you said high, but what is bad - the IC ? or one of those power transistors ? I can desolder those 1 at a time ...
Cool.
Srinath.
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Old 20th January 2014, 07:54 PM   #24
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Hi,
Q127 it is the negative driver transistor for the speaker channel A. That it is why the micro do not allow to power on to protect the speaker A.
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Old 20th January 2014, 07:57 PM   #25
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Hi,
I forget to explain that the signal PRV it is "AND" gate of all speaker outputs. Any one will indicate to the micro that there it is a problem with one of the channels.
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Old 20th January 2014, 08:14 PM   #26
srinath is offline srinath  United States
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So 2v dc at pin 65 on startup means its got an overload ?
Maybe Q127 is bad, I cant see it, I saw its solder side that was burnt looking.
Cool.
Srinath.
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Old 20th January 2014, 08:40 PM   #27
BrianVG is offline BrianVG  Belgium
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Maybe try this, like mentioned earlier, the cap is a common fault.

EEVBlog #379 - Yamaha RX-V557 Receiver Fix - YouTube
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Old 20th January 2014, 08:43 PM   #28
srinath is offline srinath  United States
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Which cap - where is it, I have looked and not found somehitng conclusive.
Cool.
Srinath.
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Old 20th January 2014, 08:56 PM   #29
srinath is offline srinath  United States
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Ok I'll look at that youtube clip. Thanks, Sorry I didn't look at it too well.
Cool.
Srinath.
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Old 20th January 2014, 09:09 PM   #30
srinath is offline srinath  United States
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c801 is the only one that seems to fit that description.
I'll pull it and check.
Thanks.
Srinath.
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