Creative S750 speaker no sound, power LED & control POD LED are ok
Currently, my S750 speaker has no sound output from any speakers.
The symptom now
My fixing for LED blinking issue doesn't last longer than 15 days
At the beginning, it was the power LED blinking issue, after LED blinking issue occured, I started to search internet for a solution. I found a thread on another site which was posted by @ lexwalker.
I followed that thread and bought the following capacitors:
After one year reparing (see Long story for why one year), the speaker finally making sounds (see this dancing paper video), but it doesn't last longer than 15 days: One morning, after power standby for one night, I try to listen some music, power it on, play, but no sound come out anymore.
I measured the voltage output of CN5 CN4 CN6 connectors, I got the following reading values
It seems the power supply board is working, but I'm not sure whether or not the output voltage is normal.
Question
Long story
I bought this speaker at 2008-09-30, it was great. But 5 days later, no sound came out anymore, the symptom was just like now, and I asked on Creative forum, but got no answer. So I replaced it with another working subwoofer from the reseller.
At 2015-04, the power LED blinking issue occured, and no LED on control pod give light, I can't power it on. Searching internet, got a repairing thread with exactly same symptom. That thread was posted by lex, I realized he also have an account here named lexwalker when I reading https://www.badcaps.net/node/733744.
Anyway, I followed his guide thread, cleaned degraded glues on power supply board, bought capacitors at 2015-05, replaced 5 big capacitors (C59 C60 C69 C70 and C61) on power supply board, although I damaged some solder pad, but it seems I can power on speaker.
With more confidence, I replaced two capacitors on power amplifier boards. Power on, but a flash and spark came out, and fuse was blown. Bought new fuses, power on several times, several fused blowed too! I can't figure it out why, so I put the speak on the ground, leave it there for a year with dust on it.
And after one year, at 2016-04, when chitchat in an IRC channel, someone said it could be something wrong on power amplifier board, and I recheck carefully on what I'd done on power amplifier board, and found that one capacitor was reversed installed!!! What a stupid mistake!!!
After corrected the stupid mistake, I can powered it on now. Some small issues occurred
I started to scratch degraded glues on audio I/O board, it's not a nice job, and I can't clean them well, because there're massive glues on it, and many chip legs are covered by degraded glues (There're still some glues between chip legs). After some glues been removed, some issues above seems gone.
Around 2016-05-17, the speaker system seems works except the volume of Side Left & Side Right & Rear Left channels are a little bit lower. Well, at least the subwoofer/bass sounds great, it's shaking the room, so I consider it's fixed.
Then, at the morning of 2016-05-28, after power standby for one night, power on the speaker, try to listen music, but no sound anymore.
The symptom now
- The power LED on the subwoofer back pane is steady green, and I can power on the speaker -- the power/standby LED on control POD indicate it is powered on.
- The volume LEDs on control POD also indicated that I can also adjust the volume
- There're sound output from the earphone if the earphone is plugged on the control POD, but the left channel has very very low volume (closed to quiet), I have to increase the volume to hear sound from the left channel
- This issue is like same issue after one week I bought this speaker: http://forums.creative.com/showthread.php?t=506230
My fixing for LED blinking issue doesn't last longer than 15 days
At the beginning, it was the power LED blinking issue, after LED blinking issue occured, I started to search internet for a solution. I found a thread on another site which was posted by @ lexwalker.
I followed that thread and bought the following capacitors:
- Nichicon UCS2W680MHD x1 68μF/450V
- Nichicon LGX2D471MELZ35 x4 470μF/200V
- Nichicon UHE2A331MHD x2 330μF/100V
- Nichicon UHE1V221MPD6 x5 220μF/35V
- Nichicon UPW1V101MPD x5 100μF/35V
- Nichicon EEU-FR1E470 x2 47μF/25V
- Nichicon UMV1H0R1MFD x2 0.1μF/25V
- Nichicon UPW2A102MHD x2 1000μF/100V Those two are replacement for 2 big capacitors on power amplifier boards.
After one year reparing (see Long story for why one year), the speaker finally making sounds (see this dancing paper video), but it doesn't last longer than 15 days: One morning, after power standby for one night, I try to listen some music, power it on, play, but no sound come out anymore.
I measured the voltage output of CN5 CN4 CN6 connectors, I got the following reading values
Code:
CN5 (to power amplifier board 2) ================================================== . * * . * * . * * . * *[.]RED |<------ 85.5v -------->| * * *|<---- 18.7v ---->| * * * * * *|<--24.1v-->| * * * * * * * * *|48.7v| |<---- 36.8v ---->| |<--61.4v-->| |66.8v| ================================================== CN4 (to power amplifier board 1) *almost as same as CN5 CN6 (to audio I/O board) ================================================== . * * . * * . * * (0) * * . * * . * * . * *[.]RED | * * | * * | * * *| * * *| * * | * * | * * | 0v * 4.3v *8.9v * *0 * *12.2 *-7.9v * 0 * *8.9v ================================================== And the voltage reading between two legs of each 330μF/100V capacitor is 66.6V.
Question
- What's the possible reason? Where do I need to check?
- Does the capacitors I bought suitable?
- Does the voltage output on power supply board ok?
- Just now, I measured C201 capacitor on audio I/O board, it has no readings, like it's broken inside. Could this caused all channel no sound at all?
Long story
I bought this speaker at 2008-09-30, it was great. But 5 days later, no sound came out anymore, the symptom was just like now, and I asked on Creative forum, but got no answer. So I replaced it with another working subwoofer from the reseller.
At 2015-04, the power LED blinking issue occured, and no LED on control pod give light, I can't power it on. Searching internet, got a repairing thread with exactly same symptom. That thread was posted by lex, I realized he also have an account here named lexwalker when I reading https://www.badcaps.net/node/733744.
Anyway, I followed his guide thread, cleaned degraded glues on power supply board, bought capacitors at 2015-05, replaced 5 big capacitors (C59 C60 C69 C70 and C61) on power supply board, although I damaged some solder pad, but it seems I can power on speaker.
With more confidence, I replaced two capacitors on power amplifier boards. Power on, but a flash and spark came out, and fuse was blown. Bought new fuses, power on several times, several fused blowed too! I can't figure it out why, so I put the speak on the ground, leave it there for a year with dust on it.
And after one year, at 2016-04, when chitchat in an IRC channel, someone said it could be something wrong on power amplifier board, and I recheck carefully on what I'd done on power amplifier board, and found that one capacitor was reversed installed!!! What a stupid mistake!!!
After corrected the stupid mistake, I can powered it on now. Some small issues occurred
- Center and Subwoofer channel still no sound.
It's actually a software config issue, I use Fedora linux OS, and pulseaudio sound system. But the subwoofer channel was muted in alsamixer application - When adjust volume + - or mute/unmute or power on to standby, there will be a noise come out of rear speakers (especially rear right speaker). and the volume of noise follows the main volume.
After scratched degraded glues on audio I/O board, this issue seems gone - There was one time before: after plugged earphone into the jacket on remote control pod, sound still come out from speaker.
now I can't reproduce this issue anymore. - The common issue: when power on, power go off automatically and then return to standby state.
I'll leave this issue there, I can accept this issue.
I started to scratch degraded glues on audio I/O board, it's not a nice job, and I can't clean them well, because there're massive glues on it, and many chip legs are covered by degraded glues (There're still some glues between chip legs). After some glues been removed, some issues above seems gone.
Around 2016-05-17, the speaker system seems works except the volume of Side Left & Side Right & Rear Left channels are a little bit lower. Well, at least the subwoofer/bass sounds great, it's shaking the room, so I consider it's fixed.
Then, at the morning of 2016-05-28, after power standby for one night, power on the speaker, try to listen music, but no sound anymore.
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