What a daft design, in the past i have taken a junior hacksaw and cut two slots into the chassis to produce a tab to solder the wire direct. It fixed the unstable phono pre amp. Yep brutal but it worked lol.
Amazing how something so simple can cause such an issue, a nice simple repair, the best kind of repair. I think some older Yamaha's also had a similar issues with grounding screws, too. I don't blame you for putting a regular cap in place of the supercap, with shipping from online suppliers they're ridiculously expensive especially if you only need one.
Don't sweat the Canadian weather too much. Here in Houston, Tx. the weather folks often inform us about the DEW POINT & relative humidity....from 60% to 100%. They jokingly call it " AIR you can WEAR ". We are currently watching a tropical storm AND potential hurricane to hit the Gulf coast next week. Inner tubes and jet skis have been on the news more than once ....going down major roadways. I'll tell you more after I get out my HIP BOOTS. Thanks Dave. J K
1:35 I saw a black screw fall to the front, as you picked up the unit, next to the relay, to the right of the heat sink.Haven't watched the full video yet, so you may have noticed the screw rattle later on...
Cool to see how it was just a couple of loose ground screws that were causing the problem. Didn't think the screws would come loose like that in different heat temperatures??? I wonder if my Yamaha stereo amplifier receiver has a battery or a capacitor for memory storage of radio tuner presets? Far as i know the stations still seem to stay stored in place after power is turned off,,,overnight. Not to sure if it will stay stored for a week or more,,with the power disconnected.
Enlightening video! I have an STR-GX49ES, which when I got it, had a loud hum issue (speakers & headphones; even w/ volume down). And yup, turned out to be the ground screws. Also, you reminded me that it has the same issue w/ losing the presets (and last station tuned) after a brief power interruption. Dug out the service manual; sure enough, it has that exact same cap on the display board!
My STR-AV910 is very different inside (main difference is that it's using transistors, not an amp IC) yet the ground is still the biggest issue, I ended up soldering the 2 sides of the ground with wire.
Wouldn't a spring washer and / or Loctite help with the loosening ground screws? I mean soldering it is fine, but not very convenient if future work has to be done on the unit. 1:35 Watch it at 0.25 speed, when you tilted the receiver, it looks like two black something, maybe screws were scrolling down the board towards the front. They were right next to the protection contol IC. Weren't they fallen on the board through the ventilation slots and might be the main cause of the malfunction? With all the tons of VCRs you're going through, you really couldn't find a supercap on a scrap board? I wonder how long will it hold the memory with 1000uF. If it doesn't have an RTC, just an SRAM, I guess it will be good for a few hours, maybe for a day, which is fine if the goal is only to manage power outages, which as you said, very rare at your location, unless some occasional goose baking event happens :) .
1:19 Guess they put that giant sony logo there so that when someone is working on it, the tech is reminded they are servicing a sony product haha. Sorta like how car manufactures shove their logo anywhere on the car when they can.
I had the relay go click click click in the middle of the night on my Sony. Did you happen to notice a random light on the front of it blinking to the clicks? Mine did that, and for a while, I thought it was haunted... until I saw your old video. Unfortunately, that super capacitor is slowly going bad on mine I think, because one time when it sat unplugged for a while, it remembered two of my presets wrong!!! (101.1 instead of 101.5, 105.7 instead of 106.1, and 87.5 instead of 106.9.)
When this was clicking the light above the surround was flashing. The sound quality is thanks to the stk power ic. They sounded fantastic and that is why so many companies used them.
Yeah, I have a love hate relationship with the STK. They seem to sound at least somewhat nice but not be quite as reliable. Sony, Denon, Aiwa, maybe a few others all used them. I have never heard a bad-sounding stk-based product. In fact, I have a giant Onkyo receiver, (thankfully, from before the bad chip era,) that sounds almost identical in the bass range. However, the Sony seems to have a slightly brighter treble, while the Onkyo seemed to be more mid-focused. The Onkyo has 10 transistors mounted on a giant heat sink, (it won’t use all of those for stereo.) and the Sony still seems to compete when both are set to the same volume, tone, and hooked up to the same speakers.
Im in florida, yes it gets really super humid here. We have thunderstorms nearly every afternoon between the end of may to about middle of october is our rainy season. And we do get some terrible lightening here. Seen it do a number to tvs, and other electronics. You certainly don't want to be outside between about 9am and about 6pm which is the hottest part of the day. Easily about 95 degrees F at nearly 100% humidity. Nice work as always. Just goes to show how something as simple as a ground scew being loose can cause something to not function properly and then you end up pulling your hair out trying to figure out what wrong because you think its something more complicated than a simple ground screw.
You should improve the problem and prevent them from coming back. You should have used a lock washer because then you get a spring that pushes the screw upwards and the screw does not come loose so easily. Or a screw and lock nut!
The only problem is the metals are VERY different in hardness steel chassis and an aluminum heat sink ... the expansion and contraction is too wide ... it would still get loose after a lot of heat (hot heat cycles) the aluminum compresses while it's hot and the once it's cools it shrinks a lot then the screws are loose particularly the ground for the board in other words the expansion will make it get loose locktite or a bolt and nut
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12voltvids in 2068: The Sony receiver still remembers its stations.
Cool to see it was something simple that saved it from the scrap heap
What a daft design, in the past i have taken a junior hacksaw and cut two slots into the chassis to produce a tab to solder the wire direct.
It fixed the unstable phono pre amp.
Yep brutal but it worked lol.
Amazing how something so simple can cause such an issue, a nice simple repair, the best kind of repair. I think some older Yamaha's also had a similar issues with grounding screws, too. I don't blame you for putting a regular cap in place of the supercap, with shipping from online suppliers they're ridiculously expensive especially if you only need one.
And if it sits for weeks unplugged then the stations need to be reset.
Old Sony tech: Good
New Sony tech: Crap
Don't sweat the Canadian weather too much. Here in Houston, Tx. the weather folks often inform us about the DEW POINT & relative humidity....from 60% to 100%. They jokingly call it " AIR you can WEAR ". We are currently watching a tropical storm AND potential hurricane to hit the Gulf coast next week. Inner tubes and jet skis have been on the news more than once ....going down major roadways. I'll tell you more after I get out my HIP BOOTS. Thanks Dave. J K
1:35 I saw a black screw fall to the front, as you picked up the unit, next to the relay, to the right of the heat sink.Haven't watched the full video yet, so you may have noticed the screw rattle later on...
Me too!!
Cool to see how it was just a couple of loose ground screws that were causing the problem.
Didn't think the screws would come loose like that in different heat temperatures???
I wonder if my Yamaha stereo amplifier receiver has a battery or a capacitor for memory storage of radio tuner presets?
Far as i know the stations still seem to stay stored in place after power is turned off,,,overnight.
Not to sure if it will stay stored for a week or more,,with the power disconnected.
Loctite? Works on aircraft :)
Thank you. All good now!
Getting close to 100K subs! Cheers!!
Has the Sony DA5800ES been known to have the same issue? I just purchased one that also goes into protection mode.
Enlightening video! I have an STR-GX49ES, which when I got it, had a loud hum issue (speakers & headphones; even w/ volume down). And yup, turned out to be the ground screws. Also, you reminded me that it has the same issue w/ losing the presets (and last station tuned) after a brief power interruption. Dug out the service manual; sure enough, it has that exact same cap on the display board!
Good old Elna super caps.
@@12voltvids Yup, about $8US/shipped for ten, direct from China. But who knows if they're genuine Elna.
My STR-AV910 is very different inside (main difference is that it's using transistors, not an amp IC) yet the ground is still the biggest issue, I ended up soldering the 2 sides of the ground with wire.
These "goldcaps" need a longer time to charge then a capacitor. It holds voltage not current on a chip memory.
That was weird seeing that , knowing you already repaired it.
5 years ago, and I tightened it up. The supercap was ok then.
Wouldn't a spring washer and / or Loctite help with the loosening ground screws? I mean soldering it is fine, but not very convenient if future work has to be done on the unit.
1:35 Watch it at 0.25 speed, when you tilted the receiver, it looks like two black something, maybe screws were scrolling down the board towards the front. They were right next to the protection contol IC. Weren't they fallen on the board through the ventilation slots and might be the main cause of the malfunction?
With all the tons of VCRs you're going through, you really couldn't find a supercap on a scrap board? I wonder how long will it hold the memory with 1000uF. If it doesn't have an RTC, just an SRAM, I guess it will be good for a few hours, maybe for a day, which is fine if the goal is only to manage power outages, which as you said, very rare at your location, unless some occasional goose baking event happens :) .
1:19 Guess they put that giant sony logo there so that when someone is working on it, the tech is reminded they are servicing a sony product haha. Sorta like how car manufactures shove their logo anywhere on the car when they can.
I guess yeah, solder the ground screws to the chassis and forget about it. Sorry to hear about your friend though!
Not really a friend. Went to school with him but he was a couple years younger. Teens do stupid things to get high or drunk.
Also i would resolder the smd processor for potential dry joins that are no visible.
OK, so if the ground point works its way loose, why not have several grounding points. Say a screw on the transformer near the heat sink.
I had the relay go click click click in the middle of the night on my Sony. Did you happen to notice a random light on the front of it blinking to the clicks? Mine did that, and for a while, I thought it was haunted... until I saw your old video. Unfortunately, that super capacitor is slowly going bad on mine I think, because one time when it sat unplugged for a while, it remembered two of my presets wrong!!! (101.1 instead of 101.5, 105.7 instead of 106.1, and 87.5 instead of 106.9.)
When this was clicking the light above the surround was flashing.
The sound quality is thanks to the stk power ic. They sounded fantastic and that is why so many companies used them.
Yeah, I have a love hate relationship with the STK. They seem to sound at least somewhat nice but not be quite as reliable. Sony, Denon, Aiwa, maybe a few others all used them. I have never heard a bad-sounding stk-based product. In fact, I have a giant Onkyo receiver, (thankfully, from before the bad chip era,) that sounds almost identical in the bass range. However, the Sony seems to have a slightly brighter treble, while the Onkyo seemed to be more mid-focused. The Onkyo has 10 transistors mounted on a giant heat sink, (it won’t use all of those for stereo.) and the Sony still seems to compete when both are set to the same volume, tone, and hooked up to the same speakers.
amason has two STK4182II Stereo Amplifier
I'm surprised the unit is so reliant on that ground strap. Doesn't the ribbon cable carry grounds as well?
Nope. Bad design.
Im in florida, yes it gets really super humid here. We have thunderstorms nearly every afternoon between the end of may to about middle of october is our rainy season. And we do get some terrible lightening here. Seen it do a number to tvs, and other electronics. You certainly don't want to be outside between about 9am and about 6pm which is the hottest part of the day. Easily about 95 degrees F at nearly 100% humidity. Nice work as always. Just goes to show how something as simple as a ground scew being loose can cause something to not function properly and then you end up pulling your hair out trying to figure out what wrong because you think its something more complicated than a simple ground screw.
On the subject of the weather I have plenty of vids on my channel to explain it.
Green locktite?
Can you fix my can recorder idk what happens to it. Can I send it to you some how
You should improve the problem and prevent them from coming back.
You should have used a lock washer because then you get a spring that pushes the screw upwards and the screw does not come loose so easily.
Or a screw and lock nut!
The only problem is the metals are VERY different in hardness steel chassis and an aluminum heat sink ... the expansion and contraction is too wide ... it would still get loose after a lot of heat (hot heat cycles) the aluminum compresses while it's hot and the once it's cools it shrinks a lot then the screws are loose particularly the ground for the board in other words the expansion will make it get loose locktite or a bolt and nut
I'd put a bolt with star washer, lock washer and nut on that ground connection, then torque the shit out if it. Never come loose again.
couldn't u just put some loctite on the screws to stop them from coming lose.
Solder to the board.
It only takes a couple of seconds to charge that cap fully up?
Dave a LIR2032 or such would've been a solution ?
An electrolytic cap is a solution too. Still holding memory.
@@12voltvids yeah was just my idea of solving but your el. capacitor did the job. nice to see how long it retains the memory
That is the most stupid place to fit a backup circuit ever, all they had to do is fit a bloody battery socket circuit at the back
Thats where they put em.
You'll soon know if a lithium battery has been put in place of a capacitor, it'll let off a sweet odour.
@@Runco990 how to diode isolate the battery?
Sony, overrated. The memory will still be there in six months.