Pioneer VSX-819H AV Receiver repair attempt

Attempted repair of this multi channel receiver. Failure seems to be due to an inherent defect.
Tools I use -
Soldering
Quick 861DW hot air station
Duratech TS-1640 solder iron
Multimeter
RMM760D - can be found under many name badges
Microscope
Luzky Zoom 3.5 - 90x simul-focus single boom stand trinocular stereo microscope
Camera - Lucky Zoom HD 14MP
Oscilloscopes
Siglent SDS 1102CML 100MHz 2CH
Philips PM 3305 35MHz 2CH
Bench supply
Powertech MP-3086 0-30V 3A
TL866II PLUS universal EEPROM programmer

[@ProfessorOzone]

Well that was a depressing ending. My unit (in the US) is in exactly the same condition and I was hoping in the end you would say something like. "Oh, look, it's this 1K ohm resistor. It's easy to get to. Right on top of the unit and if you replace it with a 10K ohm resistor, it will be fixed for all time and put out twice the power with half the distortion, while fixing you toast in the morning." Anyway, thank you for sharing. I'm sure it is useless to many people, but I actually like hearing your thought process as you go through it. Thanks for posting. I'll go look at the follow-up and see if there's useful information there. I suppose there might be a non-zero probability of just finding the whole panel with the chip on it and replacing that board?

[@grahamtownsend3751]

The transformer and heatsink are still useful for a potential project.

[@izzzzzz6]

I had this issue on an older Yamaha the other day. I repaired it was a bad 5V reg. I then removed the front to get to the volume encoder, fixed that and then put it back together, could tell processor was trying to do stuff but was no longer getting the signal for the relay. Totally stumped. I ended up taking a different dc (4.8v) from that zone and i ran that back to the relay transistor and it worked fine. Just better to unplug the amp when not using, also power switch still works to turn unit on and off just that regulators and amp section receiving power all the time. Thinking static may have killed it or perhaps it has a 5V in which becomes the one that is switched out rather than from it's own vcc. Perhaps I didn't see something like that. Still pretty satisfactory.

[@JonnyFix]

Oh interesting. Well done tho!

[@twodogsify]

Keep up the great work . Cheers from Whangarei.

[@JonnyFix]

Thanks mate, not all is lost ;)

[@abeleski]

Bugger! Good to see you are still around.

[@JonnyFix]

Cheers mate, don't get a lot these days!

[@marktrosh5454]

Hi, on some pioneer home theater integrated receiver, faults may cause for not powering on and had some blinking indicator somewhere on the front panel (mine is a TIMER LED). To reset these fault try to press 'Stop' button and the power button at the same time (since mine is a home theater unit it got media keys), doing this will turn on the unit. Hope this help

[@marktrosh5454]

Thanks, A good read on this 'protection circuits' can be found on pioneer xv-htd7 service manual chapter 7.1.12. Maybe this will guide on your repair journey.

[@stevendugandzic4347]

Well done its annoying not being able to buy replacement parts,very detailed tracing you'll help many I'm sure

[@riaanleroux5972]

check the primary of the mains transformer for open thermal fuse also do a factory reset

[@bornontheusa408]

First check the power amp rails, then the 12v rails, and the auxiliare rails, the secondary mannage the standby to turn on the unit, so check the secunday transformer and aux rails, if not check the power button and signal going to the integrated circuit below the pcb , the big one

[@PraveenKumar-yv9ex]

My pioneer 822k av receiver videos output coming audio not coming I change dsp tm320 ic and dac ic but sound not coming plz help me

[@mcpoulet13]

Hi Johnny I have a vsx830 with a blinking mcacc light when it turns on. Everything is dead. Have you seen this before and do you have any advice?

[@JonnyFix]

I'm sorry I have not seen that fault before. If it's still there after a hard factory reset (process not always shown in service manual) start by looking for bad solder joints and checking power rails are ok.

[@sajithsadakalum471]

I have this amp..It's standby transformer has gone. Do you know the output voltage of that transformer..?

[@JonnyFix]

The schematic doesn't say but looking at how it's connected I think 14Vrms would be ok.

[@sajithsadakalum471]

@@JonnyFix I think 9v or 12V....because filtering capacitor voltage is 16v..

[@JonnyFix]

@@sajithsadakalum471 The AC output needs to be enough so that you get the required DC level, I think after rectification 9 or 12AC won't be enough, but you do the math to be sure.

[@shawnjoe9187]

Well I got a similar situation with my VSX519v. I didnt get very much use out of it the whole 15 years Ive owned it. I finally watch tv on hdmi and turn the pioneer system on. I notice the sound was very quiet. I turned the volume up to 35 and I hear a noise and off goes the receiver. Completely dead. No power just like your unit is doing in this video. After watching this video Im going to assume my unit is going to be put in the trash as it sounds like its non fixable. I was surprised to see the inside of this 519v as it looks like a computer. I suppose all the laying it has done the electronics just have deteriorated to being faulty? Such a shame as my unit is like new condition in appearance & board wise.

[@JonnyFix]

Watch my follow up video on this and see if you can do something similar

[@zx8401ztv]

Dam it's one of those times where fancy systems stops everything dead :-( Normally i would be checking protection systems, output stages failure. Not sure in this case so that's two of us lol.

[@JonnyFix]

but wait.... there's more :)

[@zx8401ztv]

@@JonnyFix lol you sound like a comedian called jimmy cricket, his catch line was "And there's more" :-D.