OESF Portables Forum
General Forums => General Discussion => Topic started by: bluedevils on March 01, 2005, 09:20:09 pm
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I'm curious to see how big a problem this is. My 760 only has partial sound (only in tablet mode).
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The sound on my C760 is shot - all sound is distorted. It affects both the speaker and the headphone jack, and occurs on all ROMS, so it would appear that it is a hardware problem.
Unfortunately, my Z is out of warranty. Fortunately, I rarely ever used sound.
As for your Z... it's really odd that sound works in one mode and not the other. Do you mean that in tablet (view) mode the sound works fine, and in portrait (input) mode it is completely silent?
Have you tried flashing the original ROM or a fresh Cacko ROM and seeing if it works? It could be a bad setting, or something that you have installed.
Also, if you're familiar (and feel safe) with the D+M menu, you could try running the audio test, and check both modes. If it works fine in there, then it would point to a software problem.
- ashikase
- anpachi, gifu, japan
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yep done all that. Bypassed the OS by using the boot menu audio test and same results. Lanscape (input) mode is not totally silent, but it does sounds closer to pink noise (and alot quieter).
BTW I also saw that d.maddok is experiencing sound problems on his 760 too. I wonder if this is only with 760? I assume 860s are newer so they won't see this yet.
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Yep, I'm having audio trouble on my c760. Mine is out in both modes, however sometimes it will work if partially swiveled and/or pinched above the '9' key.
Definately hardware in my case.
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Mine did the same thing, but I was still under warranty so I took it in to get repaired and Sharp replaced "the unit".
Not 100% what "the unit" is but I think they repalced the hinge mechanism as I recall that there was a slight scratch on the hinge that wasn't there when I got it back - haven't had a problem with sound since.
Stu
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Oops, I meant landscape for view, not portrait (^^;
I tested the sound on mine as I swiveled the hinge, and sure enough it does appear to be related; while I never got perfect sound, the quality did change between view and input mode.
If I get time some day maybe I'll tear mine apart. Not saying I can fix it, I'm just curious to find what the relation is. (^_^)
- ashikase
- anpachi, gifu, japan
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I recently bought d.maddock1's 760 (Knowing about the sound problems) and it is definately something hardware based, and I think I found it.
The ribbon (Orange/brown) cable in the lower left of this picture:
[img]http://www.geocities.com/mrsquishywou/DSC02506.JPG\" border=\"0\" class=\"linked-image\" /]
is the cable that (I assume) carries the display and audio signals.
The cable doesnt really have a connector on it, its just a loose ribbon.
I'd imagine that it could easily work itself loose, which could explain why the audio will crackle back in if pressure is applied.
If I could figure out how to get into this thing without a hammer, I'd take a look.
My other "guess" was cracks in the solder.
Anyone had a chance to open one, and what steps did you take?
I count 7 screws, but it's catching on something.
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There are tabs around the edge of the casing... you can pop them open by sliding your fingernail along the opening in the case (it's easiest to start with the tab underneath the Cancel/OK buttons).
The ribbon you pointed out in the photo is the keyboard cable. The video cable is the one on the lower right. The speaker is on the mainboard itself (on the other side).
For some good photos, check out this page (http://digit.que.ne.jp/visit/index.cgi?Linux%A5%B6%A5%A6%A5%EB%A5%B9%B3%AB%C8%AF%A5%E1%A5%E2%2F%A5%CF%A1%BC%A5%C9%A5%A6%A5%A7%A5%A2#i5?22-DEC-2003).
I took mine apart to see if I could figure out what's wrong with the sound. I found that causing the mainboard to bend even the slightest bit caused the sound to distort; thus, I'd assume there's a bad connection on/in the board itself (perhaps a bad solder joint, as you mentioned). Not something that I think is easily repairable.
- ashikase
- anpachi, gifu, japan
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Thanks, those pictures were much easier to find stuff in.
The chip that sits just next to the keyboard connector is the audio chip. Which (perhaps not coincidentally) sits just below the 9 key.
Once I get it open, I'll check for solder cracks around there. I imagine it is a problem with the chip, and not the speaker/headphone connector as the popping is the same on both of them.
I'm sure I'll end up filling the inside of this thing with molten solder if I try it, but if I do, I'll send it to one of you guys to practice on.
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ya,l i have sound problem on my SL-5600,
when i play video with OPIE player2, there is no video, and the sounds skips.
when i play mp3, the sounds skips and in a faster rate.
any idea how to fix that?>
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I think it's a problem with the build of mplayer in the 3.5.3 Hentges ROM, but on my SL5500 Iwhenever I try to play an mp2/mp3 file on the command line using mplayer, the sound stutters to the point where I have to do a hard reset to get control back. XMMS works fine for mp3 files, but mp2 files sound awful, like they're severely bandwidth limited and with a small bit depth (e.g. 8 bit 16khz instead of 16bit/48k of the recording).
Had no such problems with an 0.9 build of mplayer on OZ3.2.
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I think it's a problem with the build of mplayer in the 3.5.3 Hentges ROM, but on my SL5500 Iwhenever I try to play an mp2/mp3 file on the command line using mplayer, the sound stutters to the point where I have to do a hard reset to get control back. XMMS works fine for mp3 files, but mp2 files sound awful, like they're severely bandwidth limited and with a small bit depth (e.g. 8 bit 16khz instead of 16bit/48k of the recording).
Had no such problems with an 0.9 build of mplayer on OZ3.2.
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yet, i still have problem.
i want to install mplayer and opie-mplayer2, but the root is full.
so i instal it on home, then it said link problems...
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I have a SL-C750 which has started to get sound problems when I move the screen in clamshell mode. Most of the time its OK then if I move the lid towards the keboard I get pops clicks and a loss of sound with high f noise both from the speaker and headphones.
Iv dissasembled the Z thinking it was a crack or a loose screw in the hinge pressing on the pcb but found nothing. I did improve matters by slackening off the pcb screws arround the headphone jack as this seems to stop the hinge stressing the pcb a little when closing but the problem is still apparent.
It seems that SHARP have skimped abit on some parts of the Z there is no reverse polarity / overvoltage protection on the power in and also no obviouse decoupling on the audio output which is obviouse to anyone running their Z through an amplifier when playing mp3s. Wouldnt have cost much for two diodes in the DC in and two capacitors on the audio out would it.
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I have had sound problems with every electronic device i have owned, i found it to be the contacts in the headphone jack no longer making contact with the plug.
the way i fixed it (comes back rather quickly) is to get a needle and put it in the socket and tease the contacts out a bit, when A2DP (bluetooth audio) works on linux properly i will just use my bluetooth headphones instead, its the only reason i boght them
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Why do people post questions like this here in what I assumed to be a poll rather than a thread for questions (actually, why don't they search the forums too?)
ya,l i have sound problem on my SL-5600,
when i play video with OPIE player2, there is no video, and the sounds skips.
when i play mp3, the sounds skips and in a faster rate.
See the last post in this thread (then work back up): https://www.oesf.org/forums/index.php?showt...180&hl=opiexine (https://www.oesf.org/forums/index.php?showtopic=10180&hl=opiexine)
I think it's a problem with the build of mplayer in the 3.5.3 Hentges ROM, but on my SL5500 Iwhenever I try to play an mp2/mp3 file on the command line using mplayer, the sound stutters to the point where I have to do a hard reset to get control back.
Do you use '-ac mad', either on the command line, or in the config file (which iirc is in ~/.mplayer/config) to make mplayer use the integer only decoder?
Si
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I have sound problems on my 6000. Made an adaptor for 2.5mm to 3.55 stereo, and only get one channel. The adaptor is definitely OK - buzzed it out.
I have tried different headphones, known working, no joy.
I've read that the 6000's socket senses the connection of a microphone and switches to input, I am wondering if I need to add a resistor as someone suggested.
Hopefully my 6000 is not faulty, 'cos I intend to use it as an in-car mp3, geting an USB external 2.5" hard drive which is 5V only and can then be mounted safely.
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I have sound problems on my 6000. Made an adaptor for 2.5mm to 3.55 stereo, and only get one channel. The adaptor is definitely OK - buzzed it out.
I have tried different headphones, known working, no joy.
I've read that the 6000's socket senses the connection of a microphone and switches to input, I am wondering if I need to add a resistor as someone suggested.
Hopefully my 6000 is not faulty, 'cos I intend to use it as an in-car mp3, geting an USB external 2.5" hard drive which is 5V only and can then be mounted safely.
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Odd on the 5500 you can use a headphone as a mic. Its not great but it works I dont think there is any detection involved just happens to have an A-D input on it.
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Actually the sound problem on (at least) clumshell devices is more serious then you may think. I have the same problem as reported here on my C750 - first the sound was starting to crack, then it disappeared completely. As I was told by my friend who's good at electronics and tried to fix that - the problem is some loose connectors inside the PCB (the motherboard). The only way to fix this is to replace the whole motherboard...
This problem has aready been reported on many clamshell devices...
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but I wonder has this been remedied with the newer clamshells? I kind of figured that all the 7x0 and 860s were vulnerable.
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I just replaced the charging fuse (https://www.oesf.org/forums/index.php?showtopic=11539&pid=107105&st=30&#entry107105) in my C760, and while doing so I caused a problem with the sound. I can sometimes make it work properly by squeezing on the case near the headphone jack. It sounds like the same issue most of you are experiencing.
My sound was fine before I opened the case.
I'm in a meeting now, but as soon as I get a chance, I'm going back to the lab and opening the case again. It's got to be a loose connection/bad solder joint near the headphone connector.
I'll post my findings assuming I can fix it.
David
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but I wonder has this been remedied with the newer clamshells? I kind of figured that all the 7x0 and 860s were vulnerable.
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I think it just takes time for this problem to appear, even on a newer models.
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I just replaced the charging fuse (https://www.oesf.org/forums/index.php?showtopic=11539&pid=107105&st=30&#entry107105) in my C760, and while doing so I caused a problem with the sound. I can sometimes make it work properly by squeezing on the case near the headphone jack. It sounds like the same issue most of you are experiencing.
Exactly!
My sound was fine before I opened the case.
I'm in a meeting now, but as soon as I get a chance, I'm going back to the lab and opening the case again. It's got to be a loose connection/bad solder joint near the headphone connector.
I'll post my findings assuming I can fix it.
David
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You'll be lucky if it's just the loose connector.
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I have good news and bad news.
The good news (for me) is that the sound on my Zaurus is working again.
The bad news is that I didn't find a cause for it. I put the mainboard under a microscope and checked out the solder joints on the headphone connector, and looked for obvious flaws in the general vicinity of the connector, but I didn't see any problems.
There is a kink in the cable which is connected near there, but all other functionality works, so I'm assuming the kink is not causing any trouble.
I did notice that the screws (2) holding the mainboard to the case do seem to flex the board slightly in the area near the headphone jack if they're screwed in tightly. The screws I'm talking about are right next to the headphone jack, and further away between the thumbwheel and the IR LEDs (I can supply a picture if needed, but they're pretty obvious). I remembered screwing them in fairly tightly when I re-assembled it last night, but took care this time to screw them in with much less force. They're now just tight enough to keep the mainboard secure in the case, but are not applying much (if any) force to flex the board. I would never leave a screw this loose on a mechanical assembly, as it would work its way out.
I suspect my problem was caused by putting the screws nearest the headphone jack in too tightly, which caused the mainboard to flex slightly, and that loosening them fixed it.
I think there are some traces on the board which are marginal, and the flexing was disconnecting one or more of them.
If you're brave enough to pull your clamshell apart and loosen the screws, it might help.
Also, if that is the problem but loosening the screws doesn't help, you might be able to put a very thin shim on the top side of the board (bottom if your Zaurus is face down on the workbench) and flex it slightly back in the other direction. I'd be very careful doing this though.
Good luck!
David
I just replaced the charging fuse (https://www.oesf.org/forums/index.php?showtopic=11539&pid=107105&st=30�entry107105) in my C760, and while doing so I caused a problem with the sound. I can sometimes make it work properly by squeezing on the case near the headphone jack. It sounds like the same issue most of you are experiencing.Â
Exactly!
My sound was fine before I opened the case.
I'm in a meeting now, but as soon as I get a chance, I'm going back to the lab and opening the case again. It's got to be a loose connection/bad solder joint near the headphone connector.Â
I'll post my findings assuming I can fix it.
David
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You'll be lucky if it's just the loose connector.
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I think there are some traces on the board which are marginal, and the flexing was disconnecting one or more of them.
That's what I said initialy. And the problem is that this may (or may not) continue to develop...
Also, if that is the problem but loosening the screws doesn't help, you might be able to put a very thin shim on the top side of the board (bottom if your Zaurus is face down on the workbench) and flex it slightly back in the other direction. I'd be very careful doing this though.
Actualy, I tried that. It helped only for some time...