Well, I tried to make some tweets about this in the hopes that they'd be discoverable on google but I guess that didn't work quite the way I expected it to.
So... I'll share it here which should be more search-engine friendly...
I just successfully fixed my Onkyo SR-TX706 A/V receiver after experiencing weird HDMI handshake issues, and (eventually) the inability to watch 1080P sources.
The symptoms, for me, were:
- HDMI sync either doesn't work at higher resolutions (1080P) or takes a LONG time, with random colored static when sync finally happens.
- In the mornings when first turning on the AVR, I would have to wait 10-15 minutes for the unit to 'warm up' before any HDMI sources would work (system falling back to analog source, or showing "no signal" for the selected input)
- This problem progressively became worse until eventually I couldn't use ANY 1080P sources like a BluRay player or my WDTV in 1080P mode. 480P still seemed to work fairly consistently though (I'm assuming due to lower 'bandwidth' requirements)
Here's the original thread about similar issues on the TX606:
...I can confirm that the same fix applies and works for the 706, although the board layout is slightly different on the 706 and has more of the capacitors that need replaced.
Onkyo 706 -specific info:
Replace these 4 capacitors on top of the hdmi daughterboard (I colored them blue so you can see them more easily):
and these 8 on the bottom of the HDMI board:
... w/100uF 10V 105° ones. The original capacitors are surface mount capacitors which are hard to solder for the average home user. As long as they're the right specs, you can use higher temperature-rated (105°C), traditional radial electrolytic capacitors.
I was able to find the capacitors at MCM Electronics for less than $20 shipped:
(when ordering >10 pieces, the price reduces to < 60c each)
Hope it helps someone with similar issues! Good luck! Sure beats going out and buying a new AVR for $400-$500. After the fix my AVR works flawlessly again.
12 comments:
Hello,
I just replaced my capacitors, and the HDMI inputs now read and are fine, but I now have no audio output. The received isn't recognizing the speakers. Any idea what could have happened?
Does the receiver 'sync' the appropriate audio for the source? (ie shows 'Dolby digital' on the display after switching to the input? If that's happening then we'd have to assume its on the output side only. Are you sure you replaced all of the cables when reattaching the worked-on daughter board? Might want to double check all of those edge connections.
I'm no electrical engineer, I just know enough to be dangerous :) but if the audio output was working before and now there's no audio output on any of the input sources afterward, and the appropriate audio type IS being detected (DTS, Dolby Digital etc) then its likely one of the daughter board connectors that isn't reattached properly or you forgot to connect one? You could have also knocked something else loose when disassembling. Take a look.
Good luck!
Hi Jase, Thank you for publishing this repair. It is the only that I have been able to find for the 706 to date. I have been having this problem for over a year now. It started with the PS3 connection, and has since moved to the Dish receiver connection. Finally decided to go for it as I found and bought a salvage 706 from eBay for $75 to cannibalize and repair the HDMI board for use in my currently in use 706.
I removed the board yesterday. Wow. Either the removal is a bit tedious, or I am much more clumsy than I knew as the 5 wire cable connector was very difficult to release, and in the process one side of the plastic retaining clip broke and... one of the three large grey components marked M70 488 broke loose on one side. Any idea what that thing is? I have not yet come up with anything in internet searches. Was hoping to repair both boards and have a spare unit for another part of the house. Thanks in advance for any information, and again for posting this. Bill
av8r49a,
I'm not sure what those components are. I think they say 470 M86. They look like capacitors but I honestly don't know. I wasn't able to find information about them either. Sounds like if you are careful you might be able to construct one good board out of the two you have though... Yeah these things are pretty delicate. I had some trouble removing the caps myself and had to do a little repair job of my own.
You might look for a service manual online for the TX706, it should have a PCB diagram showing all of the components and what they are. That way if you need to replace them you should be able to see part numbers for ordering from somewhere.
Good luck! Sorry I'm not able to help you more!
The manual for the 607, which is a similar unit, can be found here:
http://www.hifiengine.com/library/onkyo/tx-sr607.shtml
You'll need to register on the site but it does have PCB layouts and components listed. I believe you should be looking at part number L271, it's on the PCB marked 'U004 - HDMI / DSP PC Board' It shows as a 'choke coil' and has several part numbers:
NCH-2541
0182-7310-470K-RB
231363K470A
231389
Either way, I think it's a 470uH choke coil. You may be able to find one somewhere online. That's about all I can tell you! Sorry!
Thanks Jase. I took the salvaged board to a PCBA mfgr. where I used to work and had it repaired. They were able to glue the loose cap in place. Seems like an odd repair but it is working fine. THANKS for your advice!
Note: When I removed the board from my unit, the same loosened big cap problem happened... This again occurred when I was trying to disconnect that one cable. Am going to look for the large caps and have it replaced too on this board rather than just glued back in place.
Thanks for the post.
Quick question, any idea what that black paste is on one of the components in the first picture? It is towards the bottom and close to one of the capacitors that needs to be replaced.
I removed some of it during examination cause the other similar parts didn't have it. However, I realize now that it is there for a reason and many pictures/videos online show it there by default. Should I find what the paste is and reapply?
I really appreciate your post. My 706 took a crap after getting progressively worse over the course of six months. I called Onkyo and they admitted the problem with their capacitors but only offered me a refurbished current model at $100 off of what I could buy it new, with only a one year warranty... what a joke.
So I grabbed a 15 watt iron from Radio Shack and used your link to get the capacitors, total $30. Then I poured myself a beer and had at it. The biggest problem I had was with the five wire clip. It ended up breaking. One by one I removed the old capacitors per your diagrams and then soldered the new ones in their place. Make sure you get the polarity correct. Then I put Humpty-Dumpty back together again and it worked like a charm. I can't thank you enough for your effort in making this post.
Thanks for posting this, everything else out there is 606 specific...I replaced 10 of the 12 (only ordered 10 after reading the 606 forums on AVS), and my audio is also not working thru HDMI...input is being detected..I will re look at all the connectors, but they all looked good when I installed.
Anybody have a modern component part number for the 3 inductor coils on the HDMI board? Marked 470 Tz. Onkyo schematic says NCH-2541 (0182-7310-470K-RB
Very much appreciated. Rob
Hey all! Telnetdoogie here! My 706 is finally being retired, 10 years after doing this fix :) it has a humming sound thru the speakers, I believe it’s another cap somewhere on the power board but rather than fox it I think it’s time to move on :)
After I pulled it apart I saw my soldered caps and was reminded of my previous work and this post :)
good times
Mine still works however I am starting to see a blue-ish line right at the left edge of the screen.
It only shows when there is a dark scene, it isn’t enough to warrant taking it apart again but I feel like it is a sign of what’s to come
Luckily I just finished developing my basement and setup a wicked theatre.
We tend to always watch or movies there
Always great fun for this fix that made this receiver last so long and worth the price tag
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