Onkyo Tx-nr818 power supply problem

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guptau
Junior Member

Posts: 90

Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:01:33 GMT -5

Quote

Post by guptau on Nov 10, 2015 18:01:33 GMT -5

Now this is real hand holding! Much appreciated. Here are the voltages on P6601B

pin# voltage

--- -------

15 1.325

16 1.448

17 1.325

18 1.323

19 1.357

20 1.320

Thanks

mastertech Global Moderator Posts: 3,538	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:10:29 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Nov 10, 2015 18:10:29 GMT -5 What are you using for the gnd probe? Is this after pressing the power on button?
	MT

guptau Junior Member Posts: 90	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:12:31 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by guptau on Nov 10, 2015 18:12:31 GMT -5 Pin# 10 which I have been using on P7501A. Have not pressed the button, sorry.
	Last Edit: Nov 10, 2015 18:15:47 GMT -5 by guptau

mastertech Global Moderator Posts: 3,538	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:22:19 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Nov 10, 2015 18:22:19 GMT -5 Check all pins again, pressing the on button and noting the voltage while the unit is on. If it shuts down, power on again and continue testing pins where you left off when it shut down.
	MT

guptau Junior Member Posts: 90	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:23:32 GMT -5 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by guptau on Nov 10, 2015 18:23:32 GMT -5 I pressed the button and 91st it go. Pin 26 2.23. All others went to 2.07.

guptau Junior Member Posts: 90	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:26:03 GMT -5 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by guptau on Nov 10, 2015 18:26:03 GMT -5 My phone is correcting it wrong. When I let go the button, pin16 went to 2.24 and others to 2.07.

guptau Junior Member Posts: 90	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:31:27 GMT -5 via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by guptau on Nov 10, 2015 18:31:27 GMT -5 It is not starting when I press the button but I can hear relay kicking. I gave the voltage after pushing above.

mastertech
Global Moderator

Posts: 3,538

Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:34:46 GMT -5

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Post by mastertech on Nov 10, 2015 18:34:46 GMT -5

Here is what should happen. Just press the power button and let go just like you do when turning it on. Do not hold the button. You should hear the relay click on. A few seconds later you should hear the relay click off. Is this what you are hearing? Does the display do anything?

guptau
Junior Member

Posts: 90

Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:44:23 GMT -5

Quote

Post by guptau on Nov 10, 2015 18:44:23 GMT -5

Yes I am hearing relay kicking - and kicking out. Some how display is blank. When I take reading holding the button pushed:

15 fluctuates from 2 to 6v

16 from 2 to 6

17 reasonably constant at 3,34

18 from 2,8 to 3.3

19/20 from 2.5 to 3.1

mastertech Global Moderator Posts: 3,538	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:47:04 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Nov 10, 2015 18:47:04 GMT -5 How are your soldering skills?
	MT

guptau Junior Member Posts: 90	Onkyo Tx-nr818 power supply problem Nov 10, 2015 18:48:39 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by guptau on Nov 10, 2015 18:48:39 GMT -5 I have done some. I should be able to solder.

mastertech
Global Moderator

Posts: 3,538

Onkyo Tx-nr818 power supply problem Nov 10, 2015 19:14:41 GMT -5

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Post by mastertech on Nov 10, 2015 19:14:41 GMT -5

Ok, take your time with this. Get a piece of small insulated wire. On the CPU board locate those 2 regulators you tested before. Q7001 and Q7013. Solder 1 end of that wire to pin 3 of Q7013 and the other end of the wire to pin 5 of Q7001. Make sure you get this right. Check the datasheets if you need to be sure of which pins are which. Let me know when you have his done.

guptau Junior Member Posts: 90	Onkyo Tx-nr818 power supply problem Nov 10, 2015 19:23:26 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by guptau on Nov 10, 2015 19:23:26 GMT -5 Can you mark the pins below? I always mix up 1 and 3. Thanks.

mastertech Global Moderator Posts: 3,538	Onkyo Tx-nr818 power supply problem Nov 10, 2015 19:46:13 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mastertech on Nov 10, 2015 19:46:13 GMT -5
	MT

guptau Junior Member Posts: 90	Onkyo Tx-nr818 power supply problem Nov 10, 2015 20:11:52 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by guptau on Nov 10, 2015 20:11:52 GMT -5 Does it look ok?

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