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My Amps! My Amps! *Screams an old crazy man in the deli section* Answered

Yes yes, shhh I want to ask a serious question today. I traded one of my kenwood amps for my parents as their sony surround unit is really shitting out and the sound sounds terrible and the entire control panel on the front is messed up. I just want to know a couple things about the sony to see if I can fix something. The panel, well that's quite interesting to explain and if I posted a video of it you guys would probably think I edited it or something. So imagine this, the bass + and - buttons are beside the treble + and -, two sets of buttons. If you push one of the bass adjustment buttons, it glitches and turns the treble for example, up or down randomly and doesn't do what I wanted it to do. It's like this with all of the buttons and seemed to have happened after we moved here. And I know it didn't get banged around because it was transported in the back seat of a car on blankets to the new house and carefully carried in by me. If I say try to use one of the surround sound adjustment buttons it glitches out and acts like I hit another one that's beside it in any direction. Hard to explain but I'm just damn confused as to why it suddenly happend (dry solder connections?). Damn this post is long and it's only half done...lol. Bad sound, I will not tolerate it under my household, but on the other hand it was a $400 unit back 5 or so years ago and I KNOW it used to sound good, with a such a profound richness of bass that just punched right through you. Now it sounds like shit, the sound is garbled, distorted when turned up, it's not really noticeable until you turn it up fairly loud. I have/had my technics tower speakers hooked up to it and they sounded like shit when I turned them up, yet on my kenwood they sing like the wedding singer days. Any ideas nachomoma? I'll add another note that for most of it's life it's been hooked up to a pair of 250 watt (peak) optimus floor speakers and whenever we played it, it got HORRIBLY hot and warped the top a bit when it was on, enough to push it in and make it spring back up again with quite a force. I liked this receiver a lot and would like to use it again, but I don't know where all these "degradations" came from and despite my useless amount of amp questions/bickering's about I would really appreciate any ideas from you guys. Thanks.. -Punk

Discussions

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NachoMahma

11 years ago

> The panel ... . Probably dirt in the switch contacts or a dirty connector where the panel plugs into the main board. Maybe a cracked panel board. . > Bad sound ... warped the top ... . First guess is that you've fried it. Might help to clean and re-compound the heat sinks. Check all connectors. Check solder joints near the output transistors and any other parts that get hot. . > 250 watt ... speakers . The amp doesn't care about the rated power of the speakers. All it's worried about is impedance. Sounds like the speaker impedance was too low and the amp ran too hot for too long.

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PunkguytaNachoMahma

Reply 11 years ago

Well I don't know how it'd be dirty, it barely gets used. If anyone fried it, it would have been my parents as they were the ones using it. I'll see if I got some leftover thermal paste kicking around and try that, also should I just tear it apart and completely reflow the pins on the output transistors just to be sure? And these are normal house floor speakers rated for 8 ohms and 150 watt nominal input. I have them hooked up to my kenwood and it doesn't have a problem pumping them. Maybe sony gave us a dud?

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PunkguytaPunkguyta

Reply 11 years ago

Oh yes, and it is very hard to turn the volume up and down, you have to turn the knob quite a bit to get it to respond and turn up, and it sometimes goes too far and then the hurry to turn it down just as slowly, well it sucks, sometimes I turn it down and the volume goes up. Also, the remote controls it just fine, so it's a problem with the controls.

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GoodhartPunkguyta

Reply 11 years ago

Almost definitely dirty pot....I had a TV (old B/W portable) that sat about for a few years, and then when we went to use it, the volume adj sputtered and cracked so loudly we couldn't use it at knot for fear of disturbing the neighbors. When one day it must have started to short out, as it would have to be turned past 3/4 of the way for the volume to go up, and then, since it was too loud we'd go to turn it down and the same going downwards.

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PunkguytaGoodhart

Reply 11 years ago

Dirty pot? You mean dirty volume control? Well the control on most stereos (including mine) is a sealed petometer (don't quote me on the spelling) all the controls are malfunctioning so it must have something to do with the interconnects.

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GoodhartPunkguyta

Reply 11 years ago

Potentiometer, or pot. yes they seal them and if brand new that works. If they get any use though, moving parts wear on one another and they become "less" sealed. Also, the wear can cause more of a gap at the contact level inside the pot.. Yeah, if they are all malfunctioning at equally, then I'd look elsewhere.

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PunkguytaGoodhart

Reply 11 years ago

Well I unplugged a bundle of cables that (appeared) to come from the panel/display of the stereo and they kept working, with the only other cables I could see being a couple 4 wire ribbon cables. I'm really clueless (held onto the capacitors too long maybe...)

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GoodhartPunkguyta

Reply 11 years ago

(held onto the capacitors too long maybe...)

Um, you mean that you kept them too long, right ? (at first I got this vision of you being half electrocuted from capacitor terminals LOL) . Sorry....I am having a weird night...

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NachoMahmaGoodhart

Reply 11 years ago

. I think your first impression was correct.

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NachoMahmaPunkguyta

Reply 11 years ago

> Well I don't know how it'd be dirty, it barely gets used. . Dirt is everywhere. . > If anyone fried it, it would have been my parents . OK . > also should I just tear it apart and completely reflow the pins on the output transistors just to be sure? . I wouldn't - I'd save that for the nothing-else-works-what-have-I-got-to-lose stage. And go easy on the compound - a little goes a long ways. . > Maybe sony gave us a dud? . If it worked before, I'd have a hard time calling it a dud. . > very hard to turn the volume up and down . Maybe the panel is misaligned. . > the remote controls it just fine, so it's a problem with the controls . Sounds like a reasonable deduction to me.

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PunkguytaNachoMahma

Reply 11 years ago

Wow..I had to open firefox just to make a reply because safari refused to. Yes dirt is everywhere, I suppose being used in a big dusty farmhouse (with woodstove) probably didn't help it's situation. And as far as my parents frying it, just re-assuring you it wasn't me this time lol And yes it did work before, but it still got terribly hot. What do you mean by the panel is mis-aligned? I was also thinking, maybe the processor inside is on the fritz, and I know that the thing is battery backed up so you can't reset it just by unplugging it, do you think there's 2 pins or something I can short out to reset the unit? I'm thinking I should locate the ribbon cable that comes off the control board and reflow the connections (it's unlikely that all the buttons came loose from their solder connections so I suspect the cable) again chances could be that it's a push in style cable. I gotta go to work soon but I'm gonna do some work to it when I get home, I'll post some pictures up to for you to look at. Thanks Nachmahma, btw the model is STR-DE345

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NachoMahmaPunkguyta

Reply 11 years ago

> but it still got terribly hot.
. This appears to be characteristic of this model. Several of the reviews I read mentioned how hot it ran. Gets good reviews for sound quality.
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> What do you mean by the panel is mis-aligned?
. Most panels I've seen have a plastic part (face plate that you press on) and a board mounted behind it with the switches. If these parts are not aligned correctly or the ass'y is not correctly mounted to the chassis, it can cause problems.
.
> do you think there's 2 pins or something I can short out to reset the unit?
. Dunno. Check the manual (STR-DE245 uses same manual). Removing the batteries for a few hours may work. See also http://esupport.sony.com/perl/model-tutorials.pl?mdl=STRDE345
.
> reflow the connections
. Still think I'd leave this for last. Your descriptions of your previous adventures in soldering don't leave me with a lot of confidence in your ability to do this.
. First, I'd check the connectors, then clean it with compressed air (contact cleaner should work better but may melt the face plate).

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NachoMahmaNachoMahma

Reply 11 years ago

. PS: I found several manuals for the STR-DE245/345, including a service manual. ~12MB for three manuals.

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PunkguytaNachoMahma

Reply 11 years ago

I have all the origional manuals for it still, but I thought I'd give you the model number so you could look it up. I just got home like a hour ago or so, and I'm probably gonna rip into it shortly and see what I find inside. (A cracked solder joint should be fairly easy to notice??).

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NachoMahmaPunkguyta

Reply 11 years ago

> A cracked solder joint should be fairly easy to notice?? . hmmmmm How to put this? Most solder joints that look bad are bad, but a bad solder joint doesn't necessarily look bad. I've had some luck using an ohmmeter (one lead on the trace and the other on the pin) while wiggling the component.

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NachoMahmaNachoMahma

Reply 11 years ago

. Try resetting the receiver to the factory defaults. Hold the Video and CD buttons in while turning on the power.

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NachoMahmaNachoMahma

Reply 11 years ago

. Or, with the unit off, hold the power button for > four secs.

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NachoMahmaPunkguyta

Reply 11 years ago

. Either one. The power-button-for-four-secs resets EVERYTHING, while the Vid/CD/Pwr resets most stuff.

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PunkguytaNachoMahma

Reply 11 years ago

Also, I had it plugged in a couple hours ago, cover off and turned on and the one yellow bundle of thin wires coming from the front panel, I unplugged them, and the entire panel including the lcd still worked and nothing seemed to be wrong!!! Wow backup cables or wtf? So I should probably do a complete reset huh?

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NachoMahmaPunkguyta

Reply 11 years ago

. PS: NEVER connect/disconnect, plug/unplug stuff with the thing turned on! That is not a rule of thumb - learn it, live it.

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GoodhartNachoMahma

Reply 11 years ago

I remember some appliances, back um a FEW years, that did not have a switch on them. I always felt uncomfortable pulling a plug and listening to that subtle crackle as the contacts arched.....but miss that smell of ozone....not. LOL

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NachoMahmaPunkguyta

Reply 11 years ago

> So I should probably do a complete reset huh? . Yes. Hopefully it will get you back to a known, working state. Should get rid of any possible screwups in the setup.

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PunkguytaNachoMahma

Reply 11 years ago

I just did a full reset on it a few times (to be sure, Die DIEEEEE) what? I also learned that it's not a good to touch the top of the two large (I mean large people) at the same time. I was singing like a sizzling taliban for a few seconds and my left hand is numb. Stereo is not back to normal. It kinda sorta almostish did work. The volume control seems to be back to normal, the bass and treble controls are almost fine, had one or two glitches but still better. But the rest is still shits.

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its a lion

11 years ago

basically, its haunted, and sounds bad.

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whatsisfaceits a lion

Reply 11 years ago

It truly would be if all it would play is "Tubular Bells" by Mike Oldfield. For a bonus point, where was this music famously used?

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its a lionwhatsisface

Reply 11 years ago

"The familiar eerie opening, made famous by its use in The Exorcist" was that website right?

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its a lion

11 years ago

"If you push one of the bass adjustment buttons, it glitches and turns the treble for example, up or down randomly and doesn't do what I wanted it to do." thats explained by one simple thing. its haunted.

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Punkguytaits a lion

Reply 11 years ago

So the ghosts don't want me to turn the volume down when it's blaring?