EEVblog

[@EEVblog]

I wasn't happy that I had to put the video up without finding the fault, but I took the risk of doing this as a teardown Tuesday, and hence the video had to go up that night regardless of what happened. Murphy ensured that I didn't find it in time, as always.

[@Elfnetdesigns]

C-405 (marked 223K 22nF @ 630 V) is your likely suspect on the mains PSU board

[@gl3nnyboi935]

That be the one , that's what had mine playing dead.. fixed that $3 part and away she went better than new 👍

[@laszloTheJr]

Hi I had the same issue on another receiver (RX-V459). I fixed it and it is now randomly shuts off after certain time sometimes even 15minutes. Do you know what can be the issue? Is it maybe the caps on the clock or data on the flip-flop?

[@whiskeyify]

I'm always amazed at how quickly Dave can trace out the circuits, I worked for several years in a repair shop and I would have been lost here without a service manual.

[@jeffescortlx]

I always recommend checking the output mosfets right away on any amp teardown. It's quite typical that a shorted output will trip a safe mode and keep the amp from fully powering on.

[@gamccoy]

Dave, these are actually my favorite types of videos; I love the game of troubleshooting. Good job. Well-worth the effort.

[@blankfield235]

Dave a few steps for you: 1. Desolder C405 from standby board 2. Throw away 3. Solder a replacment 4. Enjoy

[@FortyTwoAnswerToEverything]

Hi! Are you a repair guy? Any experience with an RX-V1000 model? Bought mine broken at a thrift store. Her relay clicks when I hit the power button, but immediately clicks back off without ever showing anything on the display. If I hold down the diagnostic combo buttons, the relays will allow it to stay on (even the speaker relays click after a second or two), but yet, no display, so I can't go through the diagnostics. I can hit the power button and relays click off like normal. Ever had that problem?

[@nathanschneider8121]

@@FortyTwoAnswerToEverything Same problem with mine mate.

[@Brian-uq6jm]

@@FortyTwoAnswerToEverything I have the same problem with RX-V630.

[@FortyTwoAnswerToEverything]

@@Brian-uq6jm sadly I gave it away for another person to fix it. I didn't want to put in the energy and time to try to fix it since it's very outdated with surround features like dts-x, atmos, 4k passthrough, etc

[@go_dirtty]

I got the same problem on a RX-V567, but I can't find the similar C405 component. Cound you help?

[@sailoramengmawia8537]

You made me miss the old days of repairing analog circuits, this days all equipment are digital, there is no fun repairing them. As its lockdown, all i can do is looking at your vedio and i love it.

[@elboa8]

Made my living fixing these things over the last 30 years, sure brings back memories. Thanks Dave.

[@EEVblog]

Yep, turns out that was the problem (measured 500pF). Now, the question is why does such a 630V metalised polyester cap commonly fail in this circuit?

[@cjdelphi]

As soon as you powered it up, it showed a short, I was hoping you'd check for shorts on the caps/diodes as that's where it tends to fail, if we're lucky enough it's not the main IC/cpu that failed

[@Cyberpuppy63]

@@cjdelphi What's the specs on that 630 volt poly cap? Is there an "upper range" of current it can tolerate? What if there's a temporary current spike on that line? Or a change in the characteristics due to heating, or a soldier joint weak-point.

[@izzzzzz6]

Which cap was it? It wasn't a varistor was it? Perhaps it was designed as a voltage spike protection and the thing got hit by lightening or some other spike.

[@boxvic]

As a Technician, I quite enjoy seeing an Engineer's take on troubleshooting and repair (we tend to take different approaches)- so these teardown videos are a favorite of mine. I've never met an Engineer who wasn't happy, if not eager, to jump in and help with a tricky problem.

[@RobertGallop]

Loved it! I love watching experienced engineers troubleshoot, I learn a lot fix or no fix. I could watch 2 hours of this easily! It's better when it works in the end, but please don't ever let a bad result prevent posting the video!

[@chrisdowdle1]

Sir, as always a combo of humour and proper knowledge, and humility. Trying to fix the folks exact system. Thanks for the leg work. Hopefully the same fault. Save me proper hours. Have enjoyed listening and learning for years. Cheers

[@janichols89]

I haven't seen an Australian this excited about his line of work since Steve Irwin.

[@davidkeenan8747]

Thanks Dave!!!! I have LEARNED a lot from your many videos. I appreciate how you explain each component and trace the circuits.

[@Sevalecan]

Indeed. I work in a return material analysis lab and am surrounded by engineers. All of them work on diagnosing problems with existing equipment and finding a way to improve it. We get a lot of failed parts back and often times, an engineer will actually fix them to prove the source of the problem.

[@offthehookart]

Where are these type of Dumpsters?

[@vernonbosshard9317]

+Chris Chapman Rich peoples part of town.

[@mikhailgrigoryev5757]

I get sweet finds like this all the time, heck sometimes something as simple as a power cord went bad, I got my hands on a functional BluRay player, many computers, desktop, and lap top, amplifiers, stereos, even TVs, Years back, Some one was throwing out a flat screen TV which was worth a good $500 at the time, it was an older model, but great image, great sound quality, I picked it up for free, there was some weird power spike, and it blew a few caps in the power supply, the repairs in parts cost me around $3 and the TV would have been still doing it's thing today, if my dad wouldn't have dropped it and broken the screen few days ago. haha :)

[@brig.4398]

Lucky you, I seldom see anything good on the street. the high schools in my area are raising money by holding recycle days...everyone loads up their cars and takes it to the school. they drive up and the staff takes it from the car and tosses it onto a big pile so there's no chance of getting hold of it.

[@garrettyhm9962]

Universities immediately after the school year is over. Lots of students throw out high-end stuff that they've simply gotten new versions of. What a waste.

[@adamremillard1712]

thats exactly the situation where i live (only its not for a fundraiser), but the people let us pick though. Ive filled a ski mobile trailer with stuff one year.

[@Blobjonblob]

I had an old 2001 Pioneer amp weighed in at 35kg she stopped working one day and I decided to open her up and see inside, my mouth fell open the detail and the quality was unbelievable Pioneer made some amazing stuff.

[@smallenginedude71]

iShootBandits back when pioneer were good!! cant go wrong with japanese stuff. my 1979 yamaha cr820 just failed 20 minutes ago. after 36 years of HARD work the right channel failed. thats the first time it has ever gone wrong.

[@PhuckHue2]

smallenginedude71 if you have right channel in headphones more than likely its the right speaker relay. for a relay to last almost 40 years is incredible

[@killer1479]

PhuckHue2 i had a sony hifi that lasted 25+ years, im only 26 though, it was given to me, but a few months back the right channel failed, i never found out what happened, so, i took her apart and got ALL the boards out, and all she contains is... rubicon and ELNA caps... but, im often curious as to what those tiny little yellow capacitors are ?

[@talonfluff]

+iShootBandits same thing for the speakers.

[@PhuckHue2]

killer1479 yellow caps are made by Mallory

[@EmberBlaze-ij7of]

I have the RX-V692 from 1997 still working 80 watts to the main channels and 40 watts to the surround channels, absolute beast, I love it

[@Creator_Nater]

I wonder if the display is burnt. I have an old unit that appears dead, however the display is dead, after a fee button taps (with speakers plugged in) great music!

[@satman6124]

dry solder joint on display connections maybe reflow works on denons

[@Alext-wx7hr]

I recently bought a piece of JVC audio equipment from goodwill for $21! it dates from 1988 and i found a goldmine of parts! High quality ELNA caps, RCA inputs, a wide array of japanese ICs, transistors, regulators, and alot more!

[@CarlosAugusto-uu5dr]

Just fixed my RX-V659 replacing C654. Thanks!!!

[@remley8877]

Yamaha made AMAZING products back in the day. I still play a 1978 Yamaha guitar combo amp. I had to fix a couple of lifted traces where a former owner replaced the reverb pot with a VERY stiff pot (which put WAY too much tension on the board). It's just now beginning to get a bit of noise as if the power caps are starting to go. (After 40 years, I really don't mind replacing a few caps.). Still sounds amazing and is a very simple and solid design. Yamaha rocks!

[@chrisdowdle1]

Cheers Dave. Sorted the folks receiver out thanks to you and the community.

[@pepe6666]

oh man i thought i was going to see dave get defeated until i saw the link to the next video. this is an awesome video. still learning a ton

[@xmttrman]

Good job on the repair. This unit is really complex and over engineered. I found a RX-V757 at the local Goodwill for US $25.00... and this one worked from the start...but... no remote or AM antenna. I did find a remote on EBay that controls the functions properly.

[@deweys]

This is a great video! I love how Yamaha actually designed their product to NOT be disposable.

[@wheresmywibble]

Thanks for the video. Sorted my 677. Just took a few attempts to get it to reset. I used a pointy nose pliers in the end and held it in place for quite a while

[@orfescuhoratiu]

in 2021 you will be so lucky to get such a nice SM with diagrams and details !!

[@david7402]

This was very interesting. You got a heck of a lot farther than I would have, so thanks for the explorative guide. The repair manual impressed me as well.

[@yor1001]

I can't believe I just watched the entire video, talk about a let down at the end.

[@petres5866]

Not everything in life has happy ending mate. Be able to pick your fights or say enough is enough when something does not worth your time I think is even more important than succeeding.

[@ixamraxi]

To be honest, I was a little disappointed to watch the whole video and find that it was a waste, but at the same time, I am impressed that you are willing to put up a video of your being unsuccessful in its repair. For that I gotta say kudo's, and even despite being unsuccessful your attempt reveals some very good information on the process generally used in diagnostics and repair of electronic consumer goods. Thanks for the video.

[@howardsway782]

Great vid & follow up repair vid. Electronics is a vast & complicates subject, you almost make it sound easy with your brilliant explanations & make the subject fun instead of dry, if only there were more teachers like you, great stuff Dave, an admiring fan from the UK.

[@rodlophus]

This thing would make a good prize for one of EEVBlog's contests - even not working! Awesome video, bloke!

[@BadRonald1]

I like that you point out what each component is. I'm trying to get started into the world of Electronics. I have a few receivers Sansui,Pioneer, Marantz that need some fixing. And will be looking at some more of your videos. Thanks

[@sergelavallee913]

I had one did the same, i had to push 3 switches together to reset the amplifier and it did go on. It was a yamaha amplifier. Factory reset combination switches pushed all together. Or change the little capacitor on the power board, the little brown one. I think it's c405.

[@chrisvighagen]

As an avid Dumpster Diver, I approve of this =D Love these dive fix videos, I learn a lot from this.

[@metallitech]

Great to find a repair video on the EEVblog channel!

[@whiskeyify]

We hired some engineers to help out in our repair shop, there thought process is different than a bench repair tech. It was fun working with them.

[@Deckardsvr]

2 videos in one day that deserve unconditional thumbs up !

[@djs5089]

I have a Yamaha RX-V800. It's a bit older, around 2000 but a bit more high end. It is just almost all throughhole! I love the Yamaha receivers, their quality and attention to detail is just awesome! It's 15-20 years old and still all the electrolytic capacitors are looking good!

[@anilksolanki]

Thanks for the video. Really saddened you didn't find a fix. You win some. And you lose some. Good on you for having a try.

[@macieksoft]

I once have repaired Yamaha amplituner. It was not turning on at all. After just few minutes of searching in the internet i found that common issue was a cap in standby power supply, quick check with the multimeter and the capacitance was way off specs, part was easy to get in local electronics store, costing close to nothing, amplituner is still fully working today, my sister uses it quite a bit.

[@UnicornRiderNarresh]

Superb explaination. Sir Recommend some links for downloading service manual for Yamaha amplifiers.( Non payment- free) After a gap of 28 years and job loss I am again refreshing my first love of electronic repairs . Regards

[@tesla500]

Those "heatsink things" on the large QFP are there to help with wave soldering. That's also the reason it's mounted at 45 degrees. It's not for routing, that's a requirement for wave soldering to work properly on a device like that.

[@rsattahip]

Japanese pride in design and manufacturing is wonderful.

[@ELECTROHAXZ]

I took apart the SAME EXACT one and I used the transformer for a power supply and the huge audio caps for the smoothing and the rectifier on heat sink for the rectification! And of corse all the wire I used for the power supply too! Awesome!

[@ubuntututorials]

In fairness to Nichicon, it probably is made using prime spec processes, but on the other hand, does a slightly lower inductance matter (one common audio cap spec), for example, when you have a long PCB trace leading to it and all the channels? Probably not. The difference may be measurable, possibly even audible -- but simply moving your head slightly is likely to have a greater effect.

[@brichardsfourty]

Absolutely love, Yamaha stereo, amplifiers and speakers everything they make is perfection they make it so like it’s rated as diamond or gold standards perfection

[@syragrippa8769]

'RX' usually denoted a receiver while 'AX' was the tag for Yamaha's integrated amplifiers.

[@dedskin1]

Hardly even a dust particle on it , pins are shiny, i tell you , i would like to get access to that dumpster, some kind of a clean filled with nice things kind of dumpster you know .

[@ForViewingOnly]

Never figured out why these things are called 'receivers'. I'd say the primary function is to amplify, and secondary purposes are to separate Dolby 5.1 signals into separate channels, give a bit of EQ and DSP, and do the radio tuner thing. Just wondering.

[@mitch19636]

I own a R-XV3900. After many years of service the amp still is good as the day 'she' was first switched on Regards, Mitchell.

[@AdamosDad]

those blue loop retainer wire may be used for further filtering.

[@sergelavallee913]

I forgot to say an important thing also. Before i had to reset the yamaha, i had to change a bad capacitor in the power supply section. That's why it did not want to go on, than i suppose it did put itself on self protection even if i did change the bad cap it would not go on until i execute the reset. So 1- I did change the cap. 2- It needed to be reset. 3- Imagine if they start to built all the amplifiers so if you don't know it has to be reset after repair and if second you don't have the service manual telling you which switch to push all together to reset it. Depend on each model i suppose but in that case i had the service manual so i've been lucky because without knowing this, the amp was fixed and there was no way to switch it on without knowing this. Excuse my english, i'm french. I follow you Dave since years now quietly and i did learn so much from you. Thank's a lot.

[@FyberOptic]

A shame you couldn't get it going, but I still enjoy watching such repair attempt videos. Other people can learn methods of investigating their own broken stuff.

[@timramich]

With speakers, yes, but a lot of people use headphones these days. A capacitor's application being specialized in audio is just audiophoolry, though. If they bothered to come up with a specific measurable reason why they're suited for audio, that would be nice, but they don't, and they just use audiophool terms.

[@ronniepirtlejr2606]

I found a Marantz silver series from the 80s one time sitting on the side of the road. not a bad find.

[@trondam]

I got the RX-863 and that cost around 1000 USD when I bought it back in 2009 I think it was. Great sound from it, love Yamaha sound gear. Great video 👍😍

[@Shroommduke]

This is great stuff, life err, electronics, is like a box of chocolates... We often learn more from our failures than from our successes and I am encouraged to see that I am not the only one who gets frustrated. This also reminds me that it helps to know people who have experience!

[@walikai]

Shorting capacitors can cause high current transients that can damage the cap as the internal resistance is very low. Its better to use a high wattage resistor to discharge the cap.

[@bfriesen75]

You spent more time working on this than I would have. Awesome video, thanks!

[@linksmith1057]

My guess is the microprocessor is programmed to look specifically for the pulse made by that Standby/On button to turn on, that's why bypassing the relay didn't work. My guess would be the transistor driving the relay on the mains board.

[@WeBeYachting]

Enjoyed this video, thumbs up from us and cheers from sunny IGY Simpson Bay Marina, Sint Maarten in the Caribbean.

[@iPelaaja1]

This seems to be really well designed... All the blue wires, the repairability and even the service manuals with everything... Wow. We have a Yamaha amplifier/receiver similar to yours at home, has worked great for probably ten years soon, except for one thing, everytime the source is changed, the settings changed or the amplifier powered off or on, the subwoofer makes this horrible "thump" noise...

[@Popart-xh2fd]

Experience vs Knowledge 101... When you are experienced in repairing this stuff you don't need knowledge to diagnose simple because you already know the typical failures!

[@georgemartin1436]

When the outputs blow they will damage the preamps many times and it will sense the DC on the output. We used to use a "suicide" cord into the unswitched outlet to power up the output section individually to see where the problem was. Only about 73 screws to take the output section out......

[@NelsonBigGunP200Fan]

i've had Harman Kardon before to. Very heavy. Took cover off and the transformer, audio power circut, heatsink, all well built. Caps were very huge, I think they use seperate power supplies for each amp circuit. High current capable.

[@BadAndUgly]

Discharging the supercap may solve it. The pioneer went into some kind of emergency mode after a power failure.

[@urielsmachine997]

Probably parted out by now. Apparently C405 .022uF 630V in the power supply board goes out of spec in many of these amps.

[@BadAndUgly]

I fixed my brothers Pioneer amp receiver a while ago, after some googling I found that a special push-button combination did a reset on the processor and it powered right up after that!

[@sandeepkulkarni3695]

Glad to be here after recent Hitachi Dumpster Dive Video

[@RichieUK]

My similar (newer HDMI) one has multiple clicks from the boards when you turn it on - maybe more things to check?

[@JasonBolger]

Great video, bummer it wasn't repairable! I have "revived" my Akai receiver a couple of times; shoehorned in a PC fan when the fan died, replaced the speaker output relays when the contacts died, and fixed a dry join on the main PS board when it started getting heat sensitive. More than 10 years out of this sucker now, if it dies now I have well and truly got my money out of it!

[@joshm264]

I was once given an Onkyo TX-SR606 that had a bad HDMI board, and all I had to do was recap the HDMI board!

[@DaveCurran]

I had something similar on a Technics receiver. Even when 'persuaded' by bypassing the relay, the display was blank. There was standby power to the processor, but it wasn't clocking. Turned out to be the ceramic resonator, after replacing that everything was fine and it's still going strong. Apologies if you get loads of these. Have fun anyway.

[@RobertoZedda]

Thank you for sharing! With your help I fixed my old amplifier!!! But wait... now I have no excuse for changing it! Damn... ;-)

[@vladsol2009]

About this receiver... Try to replace (even if it like 100% working) the 223K Poly-Cap on Sub Trans PCB, it will help you :-)

[@ukiemilitia]

awesome video, I learn so much from each video I watch, even if it doesn't work.

[@linusevosonic]

I bought my Yamaha RX-V1300 back in 2003 and it´s still working great even with my new Klipsch Reference 7 Speakers. Only thing broke was the remote control which was my own falt [Never spill Soda over your Remote) :D.

[@QuartetMember]

I have an RX-V657 which comes on for about 2 seconds after the soft on button is pressed, and then goes off. I can hear the relay each time. I have replaced C405 :-) but no change. Does anyone have any idea what to do, other than replacing all the caps on the power board?

[@QuartetMember]

+QuartetMember After replacing C405 the unit was still remembering the old power problem that originally caused it to shut down. So it kept shutting down based on the memory of the problem. DIAG option 9 needs to be set to RSVD (reserved) rather than INHI (inhibit) and then shut off the power. This clears the memory of the error indication. Next time I powered it up, it worked a treat! Thanks everyone here for all the advice.

[@aza302]

@@QuartetMember what you've described, how do I do that?

[@Synthematix]

I can tell you these are one of the best 5.1 amplifiers, very nice sound quality, yamaha are my no1 to go to brand for AV equipment.

[@MrTim412007]

hell from ky in the US I like theses vides you put out learning from you all I learn a lot stuff

[@metaforest]

I think this could have been found by using an o-scope on the low voltage PSW lines. The loss of cap in this case looks to me that it would cause the later processor kit to fail a clean startup due to too much ripple.

[@JMaldonado64]

I would have checked if there's a 50/60 Hz sync signal derived from the AC power. Some CPU chips require this signal in order to cut power instantly to avoid a loud thump at the speakers.

[@RossPotts]

Nowhere NEAR your level yet (OS security is what I make my living in), I found this intriguing and didnt even notice that it lasted as long as it did. I ALWAYS learn something from your videos. From one of your previous blogs, I am ready to practice SMD soldering before tackling my wife's Kindle Fire connector

[@nikolaosstavrou5327]

old school engineering YOU CAN'T beat it!

[@szaki]

Last year I found a nice Sony STR-AV1070X stereo in the dumpster, took it home and it works perfect.There's a video repair shop near buy, they must've throw it out. For $20 bought the remote for it on Ebay!

[@RGD-Audio-Repairs]

"as a bodge hack i could force that relay permanently on, so when you plug it into the mains. BANG"... I hope not :D

[@rottmanthan]

i have a sony receiver that i like the looks of, but when its off sometimes in the middle of the night the display will partially light up and you get a hum out the speaker that sure wake you up quick. i read that its common with that model and that it is or may be a ground issue.

[@DesignMitch]

"Dry that one out and you can fertilise the lawn folks!" Hahaha. Failure is part of electronics, people need to embrace that.

[@cutterscut]

check the R276 burned - it´s so simple , same issue at an JVC Reciver repaired good luck

[@ВладимирПутин-е7м]

Video Repair Fix Walkthrough / Howto. Please please please video and entire walk through of: 1 - fault isolation, 2 - diagnosis, 3 - the fix. That is why I'm here; looking for tips on how to progress with fixes on my 3 broken amps.

[@andre-michelgoulet6933]

LOVE your videos, been watching for years... We need more guided repair videos! That and product design, those are the best. Keep it up Dave, if you stopped making videos there would be bugger all to watch and Bob wouldn't be my uncle anymore! Lol

[@ВладимирПутин-е7м]

@ Andre - Yes! 2nd the Guided Repair Videos! Please please please video and entire walk through of: 1 - fault isolation, 2 - diagnosis, 3 - the fix. That is why I'm here; looking for tips on how to progress with fixes on my 3 broken amps.

[@pinturoy6033]

Nice video

[@TheDistrict644]

Didn't hear the complete go through, but, did i not hear you say it read as if it powered up, but, it wont turn on? Did you check the display to see if it was properly functioning? I did see you check the relay and it seemed to work.

[@EEVblog]

Yeah, I think it's silly term. But it seems to have stuck.

[@liamvg]

I had a Denon receiver that I had repaired, and it turned out to be something similar where it checked for +15V on a circuit and if it didn't see it, it would only turn on for 3 seconds then turn off. So your idea that it was some sort of checking system is possible.

[@envisionelec]

I think you've got an open diode in the little rectifier which is why you have a high ripple on the first voltage you measured.

[@tomekniewazne9878]

I change C405 - my Receiver is live two days after repair. After two days again he same but..... I don`t any power supply on C407 - 0.0 V. If I detach Transformerr power supply on C407 are 235 V - whats going on?

[@JerryDodge]

8:10 Couldn't help but to notice, one of those huge caps looks like it's bulging.

[@EEVblog]

I'm a design engineer, not a repair tech. I haven't repaired stuff in 20+ years. This might have been much more trivial for a good repair tech.