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Post by mastertech on Feb 23, 2015 9:54:24 GMT -5
No problem. Take your time and get well.
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Post by tibimakai on Feb 24, 2015 12:39:40 GMT -5
I have checked the board today and there are no transistors in those four spots. They are just marked, empty spots.
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Post by mastertech on Feb 24, 2015 13:01:51 GMT -5
Ok, I see that now for your model. Odd that pin 54 would have any voltage on it because of this.
Well off to the ones that had me most concerned anyways.
Ok, this test needs the receiver powered up, neg probe on chassis, DMM on DC voltage.
Locate 4 resistors, R3114,R3117,R3119 and R3122. Test for voltage on both sides of each resistor and tell me what you get.
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Post by tibimakai on Feb 26, 2015 23:19:50 GMT -5
R3114 (IC side)= 0.001V, other end= 4.813V
R3117 (IC side)= 4.766V, other end= 4.813V(common with the above)
The other two are not present on this side of the PCB. Did not have time to take the board off from the front.
May not even be there on this model.
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Post by mastertech on Feb 26, 2015 23:49:11 GMT -5
Yes, the other 2 will be there. This is near the end of testing so get those last 2 resistor readings and we will see what we have.
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Post by tibimakai on Feb 27, 2015 20:16:47 GMT -5
OK, at the R3119 and R3122 at the common point is 4.803V and at the opposite ends, the same 0.001V for both.
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Post by mastertech on Feb 27, 2015 20:34:03 GMT -5
OK, at the R3119 and R3122 at the common point is 4.803V and at the opposite ends, the same 0.001V for both. Ok, same test but this time when you are on the .001v side, rotate the volume control back and forth and see if you get voltage bouncing around but should be upwards of 5v. |
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Post by tibimakai on Feb 28, 2015 16:14:26 GMT -5
It is bouncing up to 4.794V. Both of them.
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Post by mastertech on Mar 2, 2015 18:39:19 GMT -5
Well here is where we are at. I am not seeing anything in particular wrong with all those voltages posted of the ic pins except for pins 31,32,33,34 which you indicate 0v. These pins are for the volume and selector knobs. The lines receive power through resistors R3114,R3117,R3119,R3122. Your testing indicated 0v on the output of all resistor except R3117. Now I don't know why you showed voltage here but not at pin 32 like you should have unless there is a problem or you did not get an accurate reading on the pin or something changed. Frankly, you should have app. 5v on all 4 pins and the voltage should drop when moving the selector. I verified this on a VSX40 that i have here. Yours showed 0v but then voltage increase when volume moved which is contradictory. Now, I don't know if this would really matter or not but it is the only anomaly I am seeing here. If it were me, I would disconnect the harness to the selector control knob and I would also unsolder the volume control switch and see if all my pins came up to app. 5v. If they did, I would try powering it up normally. If it still does not power up the I would have to assume there is something locking up the processor which I would then suspect something in the HDMI circuit since that is a common issue. But we have come to a point where we really need to find out just which board the problem is on and that would require getting a working unit and testing each board separately. You may even have more then 1 faulty board. It wouldn't be the first time I encountered that. Anyways, let me know what you find. I sold the last VSX60 I had here or I would suggest you send the unit to me and I could test the boards. I do not have any more compatible units here right now.  |
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Post by tibimakai on Mar 3, 2015 12:40:06 GMT -5
First, I will measure again those points. Just to be sure, that I have measured it properly.
I have purchased new probes for my meter(Probe Masters), the ones I had previously, I could not trust them anymore. The tips, were sliding in and out way to easily.(TL910 used, from Ebay)
I don't have the receiver in front of me, but I don't know exactly, which harness is for the selector.
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Post by mastertech on Mar 3, 2015 12:54:29 GMT -5
The selector control is probably on a separate board with a harness going to the front board. The volume control is usually soldered right on the front board.
Something else I just thought of. Does yours have an HDMI connector on the front panel? If it does, you have to have the internal HDMI cable connected to that board and the digital board along with it's wire harness or the receiver will not turn on normal. Found this out myself the hard way.
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Post by tibimakai on Mar 4, 2015 12:04:11 GMT -5
It's not connected.
You are saying, that all my measuring can be off, because of this HDMI cable?
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Post by mastertech on Mar 4, 2015 18:42:35 GMT -5
I am not saying your measurements will be wrong. But I am saying that if the HDMI cable is not connected, the receiver will not turn on properly.
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Post by mastertech on Mar 4, 2015 18:46:08 GMT -5
Also, if the selector knob board harness is not connected then pins 31 and 32 should both show close to 5v.
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Post by tibimakai on Mar 7, 2015 17:36:59 GMT -5
I'm taking a little brake, with this receiver. I'm repairing an Onkyo TX-NR626(Chk Speaker).
I also have a Lenovo E520 to diagnose, I'm building a PC for the garage, that I'm using for repair jobs.
I have to install a radar detector(Escort Redline), in my car(hard wire).
Just a couple of days.
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