Yamaha RX-A800 No power , !!! FIXED !!!

nashou Unmoderated Off Topic Tech in Training..... Posts: 1,239	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 21:32:15 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by nashou on Feb 16, 2017 21:32:15 GMT -5 ic901 1=1.1 2=21mV 3=.502 4=3.296 5=0 A few are off Nashou

mastertech Global Moderator Posts: 3,538	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 21:37:24 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Feb 16, 2017 21:37:24 GMT -5 It looks like that 3.3dsp has to be turned on by DSP_PON and it is probably not being turned on because you are bringing it out of protect mode. I would not worry about it just yet.
	MT

mastertech Global Moderator Posts: 3,538	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 21:40:17 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Feb 16, 2017 21:40:17 GMT -5 Do you have 3.3v at pin 16 of this same ic901?
	MT

nashou Unmoderated Off Topic Tech in Training..... Posts: 1,239	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 21:42:02 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by nashou on Feb 16, 2017 21:42:02 GMT -5 Feb 16, 2017 21:40:17 GMT -5 mastertech said: Do you have 3.3v at pin 16 of this same ic901? Yes Its at the connectors too CB107 etc. Here is Q9301 and other voltage regulators I assume.
	Last Edit: Feb 16, 2017 21:46:36 GMT -5 by nashou

mastertech Global Moderator Posts: 3,538	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 21:49:02 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Feb 16, 2017 21:49:02 GMT -5 Hold on to that 3.3dsp for now. Are you sure pin 2 of ic901 was 0v?
	MT

nashou Unmoderated Off Topic Tech in Training..... Posts: 1,239	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 21:49:46 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by nashou on Feb 16, 2017 21:49:46 GMT -5 Feb 16, 2017 21:49:02 GMT -5 mastertech said: Hold on to that 3.3dsp for now. Are you sure pin 2 of ic901 was 0v? Ill double check and answer in this post. Yes 20 mV
	Last Edit: Feb 16, 2017 21:51:30 GMT -5 by nashou

nashou Unmoderated Off Topic Tech in Training..... Posts: 1,239	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:01:33 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by nashou on Feb 16, 2017 22:01:33 GMT -5 Looks like that is the Power supply protect signal

mastertech Global Moderator Posts: 3,538	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:03:00 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Feb 16, 2017 22:03:00 GMT -5 Yes. It appears to be a problem. On this same board locate Q702. Hopefully it is accessible and you can test voltages of B,C,E.
	MT

nashou
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Tech in Training.....

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Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:05:30 GMT -5

Quote

Post by nashou on Feb 16, 2017 22:05:30 GMT -5

Feb 16, 2017 22:03:00 GMT -5 mastertech said:

Yes. It appears to be a problem. On this same board locate Q702. Hopefully it is accessible and you can test voltages of B,C,E.

Yes its side A same side.

Let me go a voltage check on that little sucker.

Nashou

nashou
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Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:20:30 GMT -5

Quote

Post by nashou on Feb 16, 2017 22:20:30 GMT -5

I figured out E by using continuity test since it goes to ground.

So

E=0
and then I got a 0 and +3.2 it should be 1.2

Data sheet for Q702 www.alliedelec.com/m/d/fb22d391cbd5421fdec99d08875c5082.pdf

Nashou

Last Edit: Feb 16, 2017 22:32:56 GMT -5 by nashou

mastertech Global Moderator Posts: 3,538	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:38:09 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Feb 16, 2017 22:38:09 GMT -5 Locate R9010. It connects to pin 2 of ic901. See if you have 3.3v on 1 side and 0v on the other.
	MT

nashou Unmoderated Off Topic Tech in Training..... Posts: 1,239	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:43:49 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by nashou on Feb 16, 2017 22:43:49 GMT -5 Feb 16, 2017 22:38:09 GMT -5 mastertech said: Locate R9010. It connects to pin 2 of ic901. See if you have 3.3v on 1 side and 0v on the other. 0 volts on both sides

mastertech Global Moderator Posts: 3,538	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:49:30 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Feb 16, 2017 22:49:30 GMT -5 That's odd. How about R9020 both sides?
	MT

nashou Unmoderated Off Topic Tech in Training..... Posts: 1,239	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:56:11 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by nashou on Feb 16, 2017 22:56:11 GMT -5 Feb 16, 2017 22:49:30 GMT -5 mastertech said: That's odd. How about R9020 both sides? There is no R9020, do you mean R9022? Wait, its on the B side , Underneath Nashou
	Last Edit: Feb 16, 2017 22:59:44 GMT -5 by nashou

mastertech Global Moderator Posts: 3,538	Yamaha RX-A800 No power , !!! FIXED !!! Feb 16, 2017 22:58:26 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Feb 16, 2017 22:58:26 GMT -5 The schematic shows a R9020 (10k) connected directly to R9010 (1k).
	MT

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