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.
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......
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.
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.
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..
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.
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
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
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.
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
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!!!!!!
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.
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, 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.
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.
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.
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 👍
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.
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.
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.
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.
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.
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........
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.
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.
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.
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.
@@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
@@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