Onkyo HT-R690 AV Receiver Front Right Channel Not Working

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

Ok then I guess I know where it's heading tomorrow morning lol

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

I'm assuming I have to strip it down transformer has to come out heatsink all that since its all screwed to the bottom. Then it has to be built on a bench with no chassis to test. It's the only way I don't see any other way.

[budm]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

I'm looking at those pages I can't see any relation. The first page shows how the unit comes apart and the others is a block diagram and a schematic.

Page 7 block diagram showing #BAAF-0621 for the audio section where Q4001 is.
Page 10 shows the diagram U0010/BAAF-0621
Page 2 shows exploded View where U0010 is.
Page 53 show the list of PCB/PCBA.

[budm]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

I'm assuming I have to strip it down transformer has to come out heatsink all that since its all screwed to the bottom. Then it has to be built on a bench with no chassis to test. It's the only way I don't see any other way.

Good clear pictures of the bottom of the chassis?
Pictures of the top view of the internal of the unit?
You may have to do that since there is no PCB layout to see if the signal path can be probed from the top side of the board.
It is not going to be easy, but that is how you learn to figure out the way to test the circuit.
I paid my due spent hours, days, months on some complicate stuff before so for me to transfer you the 40 years of knowledge to the beginner just from the pictures and typing without the unit in front of me is almost impossible.
When you spend lots of times on your own and finally figure it out how to solve the problems at hand on your own, you will remember that for the rest of your life.
You can some time spends hours just to figure out how the signal gets from point A to point B from 50 pages for the schematic, and then have to find where the parts are at on the actual board.
So if you think you will be spending a couple hours figure this thing out, you can forget that.
And when you get to the test [ont you still need to learn how to use the mACV meter as the tool to test the audio signal since you do not have the scope or the Audio tracer.

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

Ok I got the bottom off

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

here is the beloved IC

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

Even though I got to the ic I don't feel like going any further with this project because I agree it's not for a beginner. I repair TV's all the time, but not at board level unless it's capacitors and did one ic once with a heat gun and a flux pen. TVs are a little different in my opinion because you have your common faults you usually know what it could be because of understanding what each board does and how it works etc. I guess I was kinda hoping this was like a common fault kinda like the notorious HDMI board issues that plague these. But this issue could be a combination of things lots of components could of killed each other etc

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

But I do appreciate and thank you for spending your time with me and I appreciate sharing your knowledge. What I'm going to do with it is take the HDMI board out because it works good. Replace the caps on it for prevention of issues and heatsink the DSP then take my bosses unit and just install it for him for free since he has an Integra with the same HDMI board that's faulty and the rest of the unit I'll throw away.

[budm]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

Well, the service manual show you the signal paths and the the actual diagram of what is section is and how audio form the input gets to the output.
the bottom line is to understand the basic and how each component works, for example, transistor can be used as amplifier or as a switch, you have to be able to read the schematic to understand how the parts is being used. Once you have good base of understanding then it does not matter if you work on the amplifiers or the TV. You can fix TV power supply because you can see the bulging on the top of the caps but do you really understand each function of each section of the power supply to figure out why it is not working if you are not seeing any caps with bulging tops, that is the real troubleshooting. Replacing caps with bulging tops are easy, it is not easy when there is no clue.
What do you do if some one gives you the TV power supply board to fix that does not work and no sign of caps with bulging tops?

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

Well, the service manual show you the signal paths and the the actual diagram of what is section is and how audio form the input gets to the output.
the bottom line is to understand the basic and how each component works, for example, transistor can be used as amplifier or as a switch, you have to be able to read the schematic to understand how the parts is being used. Once you have good base of understanding then it does not matter if you work on the amplifiers or the TV. You can fix TV power supply because you can see the bulging on the top of the caps but do you really understand each function of each section of the power supply to figure out why it is not working if you are not seeing any caps with bulging tops, that is the real troubleshooting. Replacing caps with bulging tops are easy, it is not easy when there is no clue.

Yes I understand what you're saying.

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

Well, the service manual show you the signal paths and the the actual diagram of what is section is and how audio form the input gets to the output.
the bottom line is to understand the basic and how each component works, for example, transistor can be used as amplifier or as a switch, you have to be able to read the schematic to understand how the parts is being used. Once you have good base of understanding then it does not matter if you work on the amplifiers or the TV. You can fix TV power supply because you can see the bulging on the top of the caps but do you really understand each function of each section of the power supply to figure out why it is not working if you are not seeing any caps with bulging tops, that is the real troubleshooting. Replacing caps with bulging tops are easy, it is not easy when there is no clue.
What do you do if some one gives you the TV power supply board to fix that does not work and no sign of caps with bulging tops?

I get the service manual if it's not silk screen on the board but lots of times it is and I probe the voltages on the cables to find out what's missing because sometimes it could be the main board that's at fault and doesn't trigger the PS to come on

[keeney123]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

This problem could be as simple as a bad connection at a connector.

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

This problem could be as simple as a bad connection at a connector.

It could be yes, but in this case I'm sure it's not since before I got deep into it I used the eraser on the side of a pencil to flex, move hit and prod at all the components while playing music and nothing changed. I also flexed all cables while playing music and nothing. Also hit the relays etc no change.

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

I also tried banging the unit on the floor with good force while playing music and no change. Flexed the PCBs as well nothing

[budm]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

I would check to see if the Muting Transistor is being turned on when it should not be or it has leakage resistance between E and C, see schematic PDF page 10.

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

To late guys I gave up on it last night and discarded it on the way to work this morning so it's gone. I took the good HDMI board out and I'm gonna fix my bosses unit with the board cause his is faulty. Thanks for the knowledge guys.

[budm]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

56 Threads worth.
It could have been a great lesson to learn on how to troubleshoot the problems.

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

56 Threads worth.
It could have been a great lesson to learn on how to troubleshoot the problems.

I agree, but the only issue is I have many many other things and projects to repair so right now i just don't have the time for a project like that. I have roughly 18 TVs to repair at this time and I'm the only one working on them.

[sfernandes]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

I also have many other things like headphones and things like that to repair.

[ngvuanh]

Re: Onkyo HT-R690 AV Receiver Front Right Channel Not Working

Good luck with all of those in your to do list.