I have so much respect for you. You are a true technician with real skills and personal integrity. I learned so much from you and I wish you all the best.

"A bridge over troubled circuit board" 🤣🤣

@12voltvids

4 жыл бұрын

Better not give up my day job.

@carminedambrosio7

4 жыл бұрын

It' s a famous song by "Weller and Garfunkel"

@12voltvids

4 жыл бұрын

@@carminedambrosio7 Simon and Garfunkel

@supermasterPIK

4 жыл бұрын

@@carminedambrosio7 1970, 2020 newer version, "he will ease your mind"---

I had a Yamaha RX-V480 receiver with the same problem. I found your video today and followed your solution-it worked! I did not find visible cold or broken solder joints on the IC's, output transistors, or the voltage regulator, so I re-flowed the solder on all of them anyway. My soldering iron tip was too large to add solder to the multi-pin IC's, but I did add solder to the three-terminal devices. The 480 differed from your 470 in that the surround channel board (two rear channels and a center channel) is mounted on its side, screwed to the wall of the heat sink. Thanks for the video!

I watch a ton of your videos I just had the same problem with my amp and it is the same one you have here turn on then turn off when the speaker relay kicked in I tried what you did here and it stayed on what a coincidence I had bad solder joints to thanks for the great videos they are a big help This one helped me I am sure your other videos help others too......

As an octogenarian with time on his hands, I really enjoyed watching this and your informative chat. Excellent

Blew up my old style JVC. Handed to neighbor he had it blasting 18's in five minutes. I think it had blew a cap when it popped it sounded like a small gun shot. Far as I know he still rocking it 8 years later.

I have one of those pioneer xr a-770's that you love to work on. It says hello and goodbye and that's it. I figured it's going into protection mode too. It was up at our cottage for years until my sister brought it home and said it wasn't working properly. I figured I would use it for the shop. It was barely making an audible sound, then decided not to work at all. I took it to bits and couldn't be so lucky to find any loose or cracked solder connections. I figure it's probably the amplifier stk ic. It may be a good candidate for a couple of those component type replacements.

you have a yamahaha....great work as always, thanks for the video

Another excellent repair! Damn lead-free solder.

@12voltvids

4 жыл бұрын

I couldn't have said that better myself.

@ssks1979

4 жыл бұрын

I would assume NASA does not use lead-free.

@kingstonbaptista9171

3 жыл бұрын

@@12voltvids Hi I have a yamaha ax-396 amplifier the relay trips as soon as I click the standby button ... can you please help me solve this issue.

I could watch this stuff everyday. And, I do.

I have a Yamaha RXV375! Don't use it much but if I ever have a problem like the one you described, I'll check it out!

...."In the old days...." They used to design these with a removable plates on the bottom of the chassis. Now it's a pain in the ass!

@12voltvids

4 жыл бұрын

I used to dread Yamaha units coming into the shop as they were the first ones to not have the service hatch. Then they all copied and I started to hate em all.

@rusty1187

4 жыл бұрын

LMAO!! You had to be there....! BTW>>> That was a LOT of cracked solder pads! one of the worst i have seen!

I really liked that explanation of the transistor. bias. new class a. Can you make your own video about it?

Thanks for the vid. I have a similar model yamaha in my workshop that shuts off when the volume is raised to around 1/4 of the volume dial. I haven't had a chance to pull the covers off yet and my first thought was perhaps a faulty speaker protect solenoid but i'll keep my mind open. Thanks again.

good job sir wow.you are.a master of all.

Thanks Dave, very timely. I do have a Yamaha RX amp on my bench that goes into protect. The unit and display panel still have power after it senses a fault but I get a code displayed. Do you think it may be a similar issue ? J K

Wow.! with so much patience you showed us what could be the Issue is, in some cases it may differ. I'm also facing the same problem with Yamaha RX-V 357 amp.. Thanks anyway for the valuable information..

You're getting a like just for the crow joke. I GUESS the repair was interesting too.

Very Nice job. I own a Yamaha rxv receiver with the same problem. I will check. Thanx for the tip.

Good tips on teardown, thanks.

I started pulling all the wire connecters out of my RXv659 and finally one worked, and it stayed on. can't beleive it.

I have a Yamaha rx-v795a stereo amplifier from 2000,,,a 20 year old amplifier with built-in radio tuner and Dolby pro logic and Dolby digital surround sound. The only problem I may have with it is the sound cutting out in the left and right channels,,,which may b the same trouble as u had with dry open circuit joints on the transistors and ics too.

Those Sanko transistors, so common, right from cheap end units, right up to higher end units.

Awesome diagnostic/repair video. Found you by chance, upon searching for a solution to my Yamaha RXV377 Receiver. The unit is rated @80watts/channel. The problem is that when I turn up the volume to 80%, it turns off and the display reads "CHECK SPEAKER WIRES". I also checked each wire terminal, for each speaker for any loose bits of wire. Found about 5 little bits of wire in one terminal only. But the problem still persists. The unit is set to run speakers at 8 ohms. Center channel is a 200 watt 8 9hm speaker. Left/right speakers are tower bass reflex @200 watts, and finally; rear speakers are Sony, @ 100 watts each ,@8 ohms. Wires used are speaker wires, forgot the size, but are the lamp wire type. Could the issue be the wires are not capable of sending the correct voltage? Or do I need a larger sized speaker wire. I am just guessing. But l, you know more about this. Hope you can help me in this. Thank you for your time. God bless you and your family

Wow fast analysis. Gotta feel good about that one

@12voltvids

4 жыл бұрын

I knew from the symptom it was going to be a broken connection in there.

My brother in law has a Yamaha Rx-v375 quit working on him, he gave it to me to look at. I got it to power on and run for around 30 minutes to an hour however it will power off after that time. If you power it on right after shut down it will immediately shutoff, but next day will run for 30 minutes to an hour again. Diagnostic code PS PRT : 185H Hoping you can throw me some knowledge on this issue, I appreciate any advice and all the information you share in these videos. I run two aventage series Yamahas and hope I never see these issues in those as they were not cheap.

I miss having those extra AC outlets on the back of gear. That was so convenient. Don't miss those clip speaker connectors though.

@12voltvids

4 жыл бұрын

These always invite overloading which burns out the power switch and creates a fire hazard when the mains cord melts.

I have a Yamaha AV RX-V1065 that the FM tuner is intermittent. It does not cut-out on AM, only, the FM signal. Any suggestions? Enjoy watching your videos. Thx

I had the same problem with my Yamaha RX V357, Fixing power shut off protection issue please suggest what to do.

If you look in the service manual you will find that these Yamahas have a diagnostic mode and it will give you a very good idea of where the problem is.

@12voltvids

4 жыл бұрын

Not when they won't stay turned on it won't.

@aaa000777

4 жыл бұрын

@@12voltvids, I just checked the service manual for that model and it doesn't include that feature. The later models did though. Check out the service manual for an RX-V620 on page 12. They had a feature to disable the protection circuit as well as display a code indicating the last protection mode. This is handy for a NoProblemFound unit that you cant find a fault with. If it displayed an output current fault you can usually assume the customer did something he shouldn't have. For these earlier models I would connect a variac to the power transformer primary and monitor ac current while bringing the voltage up slowly. Then I could check voltages without the unit shutting down on me. I am a former Yamaha authorized service tech.

@tharkthax3960

4 жыл бұрын

@@12voltvids 🤣

*Many Thanks man!*

I guess Dave Jones would have said "We're in like Flynn". Had a SONY 4.1 (no Subwoofer IIRC) that would go into protect, the center preamp had a DC offset. The entire receiver was in pretty bad shape and not worth it so I just removed the center output from the circuit to get it working again. And I had a JVC 1001 self destruct due to dry joints. Fixed it though because it was in good condition otherwise and being a cutting-edge top-of-the-line model pretty much worth saving. I just had to redo the *entire* internal wiring... and these small green audio rated electrolytic caps were bad.

My Yamaha receiver was doing this...and I tried removing a ribbon cord but broke it. Wish you lived nearby....I'd have you fix it. There's no way I could do this fix. Thanks for the video!!!!!!! Blessings!!!!!!

Brilliant, was the wha wha whaaaa a squidward impersonation?😆 High appreciation for the tutorials on amp operations! Just wondering if the solder is naff - would it be worth checking the main power board also? Anyway great fix as always 👍

@12voltvids

4 жыл бұрын

Have you ever taken the main board out? The extra time would easily double or triple the repair cost for nothing and increase risk tgatvsomething else will get broken in process.

@tharkthax3960

4 жыл бұрын

@@12voltvids i suppose so!

Where is your meter negative while checking the output transistors?

What was the build quality like on these Yamaha units back in the days of repair?

@12voltvids

4 жыл бұрын

I think you answered your own question.

@mjl4423474

4 жыл бұрын

@@12voltvids Haha, good point. Perhaps I should have asked if they're more common for needing repairs over other bands

@12voltvids

4 жыл бұрын

@@mjl4423474 when I was in the business I saw a fair number of Yamaha receivers. Ev eery n more once we became a Yamaha dealer.

Nice repair... I would have checked the PCB of the main channels too for broken connections

@12voltvids

4 жыл бұрын

Too much work, and if it breaks later then I get to service again. Also, having to totally tear down increases risk that something else will get broken. Just ask anyone that had a fully functional unit that they decide to just change all the capacitors because every one of them must be bad. They remove all the boards and carefully replace them all only to find it doesn't work upon reassembly.

Good job Dave is not a big problem

This is exactly the fault I have on my Sony TA-VE215 surround amp. After it gets warm I hear a click and the front speakers stop working. Turns out it's cracked solder joints on the relays.

@ro63rto

4 жыл бұрын

All sorted. These were the culprits i.imgur.com/lcgdWJM.jpg but I reflowed any others that looked dodgy and there were lots!

The crow story crowed me up.

It actually looks of decent consumer quality, no where near commercial but easy to service and built to break down.

My JVC theater DVD system TH-D5 does the same thing, turns on but 3second later turns off! Gonna go under the hood and check out the lose connections then.

Good and interesting video Why does relay turn on and off when there is a fault? The 90's technics amplifiers turned off when there was a malfunction or short circuit on the speaker cord and you had to turn the amplifier on and off. technics didn't turn on and off all the time.

@12voltvids

4 жыл бұрын

Did not pass post

@ford1546

4 жыл бұрын

@@12voltvids ?

@Natures_Intentions

4 жыл бұрын

@@ford1546 post....power on self test.

Is there a way to bypass that regulator at all?

I don't know where you got that crow joke from but I work with a older guy who tells it about twice a year almost verbatim. really anytime someone gives him a segway into crow talk he's there.

@12voltvids

4 жыл бұрын

It's an old classic.

Hi I have Yamaha rx a3070 which is not powering its just in standby mode

Is it the Fluke meter that is taking so long to stabilise its reading? Perhaps this is a compromise to some of the other features this meter may have, but it is very slow. Thanks for a good video, but please keep in mind that most of your watchers would have been left behind with a lot of the technical jargon you put forward in a very brief 23 minutes - especially novices. You're a good tech, but go easy on your pupils.

I have an RX-485 and it looks near identical on the left side!

@megashtyr1

4 жыл бұрын

My RX-V685 looks similar too

Just to remind people class A can of course use a push pull arrangement - even if it's harder to visualise, both devices are always conducting.

Oh wow a 1940 .... and still works, kinda makes a person think about the newer crap being made nowadays........That was a decent radio , I saw the whole vid........

Are we talking CROs or crows?

I got a rxv570 with the same symptoms, you willing to bet its the exact same issue lol

I have a RX-460. Hopefully mine won’t have this issue.

That joke didn't carrion very far! No, oh well, don't matter then!

Bwa ha ha, i thought it would have been due to crows feet !!! I ended up getting an Akai 3 in 1 midi system as they call them in australia, for free as it doesnt power up. Im hoping its just a power fuse else these units are like pc's inside. Hopefully a simple fix.

Yamaha-hah-ha :D

Like bridge over troubled waters? And lead free soldering. And somebody shoot that darn crow! Lol.😄

My left surround nor working properly sounds very low when I increase volume sudden shut down at high volume

@12voltvids

3 жыл бұрын

Short in speaker or wiring ?

@Imsa__gar

3 жыл бұрын

@@12voltvids I removed all soeaker wire from receiver thn I increase volume facing same problem ( shut down )

@Imsa__gar

3 жыл бұрын

And yes my Yamaha rxv 1900 left surround channel not working properly

If it was made in Japan I bet you it wouldn't have this problem!!

@ford1546

4 жыл бұрын

almost everything is made in Japan, china nowadays. All electronics can break down no matter what country they are made. By experience, Japan is better than China.

@RedShift5

4 жыл бұрын

I think the problem is the kind of solder they have to use. Lead free solder is just more fragile than solder that has some lead in it.

It must think it's Holly from Red Dwarf when she gets her massive IQ. On! OFF! On! OFF!

Is that Yamaha a 2 or 4 stroke? JK. Nice repair.

Dam cracked joints, but nothing was damaged :-D Car car truck truck lol, really bad but i fell for it ha ha :-D

Yamaha build quality and design? Looks like not anymore ! 😒

"Thermal Runaway" They Don't Like It Up 'Em!!!!!!

@keithcitizen4855

4 жыл бұрын

With all that heat sinking the thing could be used as a foot warmer.

easy job

@12voltvids

4 жыл бұрын

When you know what you are doing.

Too bad companies like to save pennies for not providing a simple back panel with 4 screws,just in case someone needs to reflow those bad joints,or change bad caps.

@PhuckHue2

4 жыл бұрын

They were built to be disposable

What I don't get is why Yamaha uses such laughably small transformers.

Who else has tried to cut a zip-tie, but accidentally cut the wire it was holding?

I wish i knew how to troubleshoot electronics :-(

@12voltvids

4 жыл бұрын

Your shitin me right. Lots of stuff from japan had the same problem.

@12voltvids

4 жыл бұрын

It can be learned.

@SDsailor7

4 жыл бұрын

Yes but it will take me a lifetime! I will have to take it one baby step at a time. Your videos help a lot! keep them coming,Cheers

@tekoppentekoppen761

4 жыл бұрын

With some good meters you can do it.

@SDsailor7

4 жыл бұрын

@@tekoppentekoppen761 I have a Klein 600 multimeter unforunately is not true rms. I also have a Tektronix 2445 O'scope but dont know how to use it i cannot find any good tutorials on how to hook it to a component to check it and i do not want to injure myself or the equipment. I also have a signal generator and heathkit digital counter I even have a variac. So i have a lot of test equipment all i am missing is the knowhow on how to use them. So i make do with the dmm and a transistor and capacitor checker. Of all the gear i have the one i would most like to know how to use is the O'scope. Cheers

Single sided circuit boards.. a common source of problems

@12voltvids

4 жыл бұрын

Wave soldering is the fault not the circuit board.

@jeremylister89

4 жыл бұрын

@@12voltvids it doesn't help. Far more contact area on double sided plated through boards, but leg kinks for stress relief also good idea. Noted on this board Yamaha bent some legs flat to board then soldered, that's good practice. How's the crows? In the UK we seem to only have problem with seagulls

consumer grade PCB. built to die

Haha!