Sony STR-DH520 Goes into protection

jeremy Senior Member Posts: 371	Sony STR-DH520 Goes into protection Dec 16, 2014 15:17:03 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jeremy on Dec 16, 2014 15:17:03 GMT -5 The 20vdc on that resistor is not there anymore

mastertech Global Moderator Posts: 3,538	Sony STR-DH520 Goes into protection Dec 16, 2014 15:35:43 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Dec 16, 2014 15:35:43 GMT -5 Is there any voltage there?
	MT

jeremy Senior Member Posts: 371	Sony STR-DH520 Goes into protection Dec 16, 2014 18:02:53 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jeremy on Dec 16, 2014 18:02:53 GMT -5 non its flat zero

mastertech
Global Moderator

Posts: 3,538

Sony STR-DH520 Goes into protection Dec 16, 2014 19:14:19 GMT -5

Quote

Post by mastertech on Dec 16, 2014 19:14:19 GMT -5

Then we next need to find out what is triggering the shut down. We will go right to the end and work backwards.
Go to the digital board and locate the main chip (ic2105). Locate pin 87. Right off pin 87 there should be a resistor R2953. Remove it and try receiver again. This should disable the entire protect circuit.

jeremy
Senior Member

Posts: 371

Sony STR-DH520 Goes into protection May 12, 2015 10:05:08 GMT -5

Quote

Post by jeremy on May 12, 2015 10:05:08 GMT -5

So MT, guess what, this receiver is working now! Sadly what was messing you and me up was my own doing... I plugged the secondary output from the transformer into the headphone jack on the mainboard. So since there was no secondary power where there should have been, and power going in where it shouldn't have been, that's why it kept going into protect.

I finally dug it out again today and noticed that I did that... I think I was on auto-pilot when I was working on it last, since I never even noticed that!

Anyway its working great now, the relay that went bad was the actual problem, it kept causing the fuses to blow. At least now I know for sure and I'll be sure not to space out such an obvious mistake again!

Thanks again MT!!

mastertech Global Moderator Posts: 3,538	Sony STR-DH520 Goes into protection May 12, 2015 11:43:29 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on May 12, 2015 11:43:29 GMT -5 Hahaha, no wonder things were not making sense. Glad you got it worked out though.
	MT

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Post by jeremy on Dec 16, 2014 15:17:03 GMT -5

Post by mastertech on Dec 16, 2014 15:35:43 GMT -5

Post by jeremy on Dec 16, 2014 18:02:53 GMT -5

Post by mastertech on Dec 16, 2014 19:14:19 GMT -5

Post by jeremy on May 12, 2015 10:05:08 GMT -5

Post by mastertech on May 12, 2015 11:43:29 GMT -5

Shoutbox