tonyb
Junior Member
Posts: 26
|
Post by tonyb on Nov 11, 2023 14:59:32 GMT -5
When I suggested that page and to test the rail voltages this was assuming you maybe had lost a voltage powering many components. So you would have to check the outputs of the various voltage regulators that are listed on that page. Now the thing is, at this point if all seems to be working then you will probably have all good voltages so you cannot test anything now. But if you fear the problem may come back then you would have to try flexing that board and see if it acts up and if it does then you could do testing then. I assume this is the digital board you are talking about? Replaced most transistors and all voltage regulators on the bottom of the board, still won't give speakers or a setup menu. Anything I should try before I give up? |
|
|
|
Post by mastertech on Nov 12, 2023 11:24:41 GMT -5
I am not sure why you would just start changing parts without testing first. The reason for testing regulator outputs is to determine if there are shorted components somewhere on a board that is pulling down an output line. If you find an output that is low then further testing is used to locate the problem. Random changing of parts usually just gets you nowhere, as in your case now.
|
|
tonyb
Junior Member
Posts: 26
|
Post by tonyb on Nov 13, 2023 13:44:39 GMT -5
I am not sure why you would just start changing parts without testing first. The reason for testing regulator outputs is to determine if there are shorted components somewhere on a board that is pulling down an output line. If you find an output that is low then further testing is used to locate the problem. Random changing of parts usually just gets you nowhere, as in your case now. There was no way to test them, that's why I replaced. The regulators are almost all on the back of the board, even taking the entire assembly apart, it would still be blocked by the RS232/Analog board. I gave it a shot, it didn't work, that's all I could do. If you know of another way, I'd like to hear about it. |
|
|
|
Post by mastertech on Nov 13, 2023 14:23:22 GMT -5
There was no way to test them, that's why I replaced. The regulators are almost all on the back of the board, even taking the entire assembly apart, it would still be blocked by the RS232/Analog board. I gave it a shot, it didn't work, that's all I could do. If you know of another way, I'd like to hear about it. There are various ways to test regulator output voltages that are in locations that are not accessible while the unit is powered up.
1: Remove board and solder very small, insulated fly wires and mark them to which component they are connected to, reassemble board and then test voltages on fly wires.
Or
2: Examine schematics to located another point where the voltages can be tested, example: another point on that board, a harness connection on that board, a point on a different board that is accessible.
This is all part of electronic repairs. It is almost never possible to test a regulator output at a regulator itself. I different location is almost always necessary. If you were not familiar with this you could of just asked. Just randomly replacing parts can sometimes end up with more damage then you started with.  [/quote] |
|
|
|
Post by mmartell on Jan 21, 2024 11:37:02 GMT -5
Hello again I just wanted to report that my SR7011 has gone through many updates and is still working flawless.
Still a mystery as to why this happens but the repair has held up.
|
|
|
|
Post by mastertech on Jan 24, 2024 20:28:32 GMT -5
Good to hear. This thread appears to have helped some others, which is good.
|
|
|
|
Post by soundwave on Apr 16, 2024 6:59:18 GMT -5
Hi, apologies for pulling up this old thread but I have an issue with my Denon x4500h that is similar to this but not. The issue in summary is that i dont get any sound from anything (including test tone - i also can't scroll past the first speaker) but i can see the firmware versions. So basically the same issues as mmartell, except I can see the DSP versions. I've done all the basics - factory restore, then update; all the other restores (network etc) and still the same problem. My receiver reports that DSP2 is the problem. I went down the path of just buying the pre programmed DSP2 chip from the supplier here in australia, and did a factory restore etc and still have the same problem. I've checked all the voltages and everything checks out (thank you to everyone who has contributed to this thread, i've learnt a lot, i'm no expert). I'm now at a point where i managed to pull the contents of all 4 DSPs using a SPI programmer (another learning curve) and have compared them to each other as well as to the marantz ones posted in here (there are a lot of similarities). Unlike mmartel, the block he was missing is populated in my bins, which is why i believe the receiver is showing the versions, but when i look at the contents of DSP2,3 and 4, it looks like the factory restore starts programming DSP2 and stops, and skips 3 and 4 as 3 and 4 look like they have more empty than 2 which has much less than 1. This make it hard to compare as i dont really have a decent reference. So questions: 1. does anyone have the bins for the x4500h they can post and i can try manually programming to give it a jump start? 2. could i copy DSP1, to at least 2 and see if that jump starts it and then factory restore to fix it all up? 3. other options? the ICs i'm talking about are pretty much identical to mmartell's one - same model and IC reference in the manual. Any advice is appreciated. DSP dumps i have as follows (text files are just for easy reading): drive.google.com/drive/folders/1YGUjCaXZ_bk-BIKGfVXoc-P3iexoXzce?usp=sharing |
|
dezma
New Member
Posts: 1
|
Post by dezma on Jun 24, 2024 13:03:28 GMT -5
Hi,
I also have an issue with my Denon x4500h similar to tonyb. I get No sound and setup/ option menu. The hdmi output to the tv screen shows a black screen despite the TV recognizing there is some signal coming from the receiver. Also, if i change my receiver source to HEOS or Bluetooth, I'm now able to see those menu on the TV but still no sound output.
From the status, the receiver reports error DSP1 ERROR 1.
DSP 1- 4 all display 00:00 while GUI displays no value at all. FIRM ERR displays only in the first 1 minute or so after power on but disappears shortly after.
Did any of the guys with x4500h get a way of fixing this. Seems this to be a common occurrence with this unit.
|
|
