Author Topic: Help Required - Repairing a Logitech Z906 Speaker  (Read 62455 times)

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Offline Tejgla

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #75 on: January 18, 2018, 10:35:14 am »
Hello

I bought a mean well hlg-320h-48a supply and two power supplys to make 230ac to 12vdc (1,2A) and 5vdc (1A). From the amplifiler pcb I got 3.3v and soldered to +3,3v keep alive pin. Everything was fine about 20-25 minutes and after that the system shut down. I turned on again and I get an input 5 and aux error. I did a factory reset but 5 minutes later the system shut down again and I was unable to turn it on again. Hold the "effect" input 1 (6x) and center(3x) blinking.

Somebody can help me?

Thank you.
 

Offline ciine

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #76 on: March 04, 2018, 04:02:59 pm »
Voltages of 12, 5, and 3.3 v must be stabilized.
If they are made by the same source and have no stabilization when they increase the volume they fluctuate and is not correct
 

Offline ruminaire

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #77 on: March 19, 2018, 02:46:15 pm »
hello,

my rear channel output from subwoofer is having problem, the rear left strangely output -9.x volt, while rear right about +12v.

the front and center channel working normally and giving about +13v.

i open the subwoofer checking the power supply is good, 3.3v, 5v, 12v, 46v all okay when I measure them without connected to controller pcb board. as soon I connected psu to controller, all voltage reading is all wrong, I think I got short circuit somewhere.

i'm looking for sign of burn in component in controller pcb and not found anything strange, no burnt smell too.

then I found rear left positive output (red) is somehow short to ground, the negative output (black) is looking okay. what do you think is wrong here? rear right show no sign of shorting but it's not giving output sound too.

subwoofer and 3 channel front and center is still working by the way, it just rear channel is having problem. if this help, i got Logitech z906 from my friend and there was  no center satellite. the problem start after 2 hour or so I put non Logitech z906 center and rear satellites for testing. it was fenda f6000 satellites. I don't know if that causing the amp fry or something because I use non Logitech satellites? is it possible?
the reason I use non Logitech rear speakers was for testing only as it's already in mounting, and I still didn't have mounting for Logitech one. that and for center speaker I couldn't help as this system I got come without it from my friend. and now I'm in regrets.

please help me, I got little knowledge for troubleshooting the circuit. also sorry for my English, I hope I make my question clear.

thanks.
 

Offline a3762341

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #78 on: March 24, 2018, 05:38:42 pm »
Hello

I bought a mean well hlg-320h-48a supply and two power supplys to make 230ac to 12vdc (1,2A) and 5vdc (1A). From the amplifiler pcb I got 3.3v and soldered to +3,3v keep alive pin. Everything was fine about 20-25 minutes and after that the system shut down. I turned on again and I get an input 5 and aux error. I did a factory reset but 5 minutes later the system shut down again and I was unable to turn it on again. Hold the "effect" input 1 (6x) and center(3x) blinking.


Somebody can help me?

Thank you.

Hey,you can use mean well's (48V 350W) supply for HV & GND on the main amp board. This is important. I just try this,and getting volume up for a long time without any problem.
 

Offline ciine

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #79 on: May 09, 2018, 04:24:49 pm »
hello,

my rear channel output from subwoofer is having problem, the rear left strangely output -9.x volt, while rear right about +12v.

the front and center channel working normally and giving about +13v.

i open the subwoofer checking the power supply is good, 3.3v, 5v, 12v, 46v all okay when I measure them without connected to controller pcb board. as soon I connected psu to controller, all voltage reading is all wrong, I think I got short circuit somewhere.

i'm looking for sign of burn in component in controller pcb and not found anything strange, no burnt smell too.

then I found rear left positive output (red) is somehow short to ground, the negative output (black) is looking okay. what do you think is wrong here? rear right show no sign of shorting but it's not giving output sound too.

subwoofer and 3 channel front and center is still working by the way, it just rear channel is having problem. if this help, i got Logitech z906 from my friend and there was  no center satellite. the problem start after 2 hour or so I put non Logitech z906 center and rear satellites for testing. it was fenda f6000 satellites. I don't know if that causing the amp fry or something because I use non Logitech satellites? is it possible?
the reason I use non Logitech rear speakers was for testing only as it's already in mounting, and I still didn't have mounting for Logitech one. that and for center speaker I couldn't help as this system I got come without it from my friend. and now I'm in regrets.

please help me, I got little knowledge for troubleshooting the circuit. also sorry for my English, I hope I make my question clear.

thanks.

Check the contenders in the rejection filter, on the branch that has shortness at the table, surely one in short
 

Offline scrhall

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #80 on: November 15, 2018, 07:57:28 pm »
Hi, I just replaced my damaged power supply with a 48v 7A, with 3 step down to reach the 12v, 5v and 3.3v, everything works perfectly, but the power supply that I put consumes in standby approximately 15w and has a fan always running. The only thing I would like now, would be to turn on the system as soon as power is supplied to the power supply, that way I could control the power on and off from the socket.
Do you know somewhere on the motherboard where you can control the on and off?

https://photos.app.goo.gl/Bjyfycd1qyZmvKYXA
https://photos.app.goo.gl/PWMrZRtTuWXksmNEA
 

Offline ciine

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  • Country: ro
Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #81 on: January 18, 2019, 06:05:42 pm »
Yes, at the moment the power play , the pw-on are 3, 3v
You use this 3,3v to command  the fan ,or uses a thermistor to command the fan to engage at 50 degrees up
 
 

Offline pepsigirl1981

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #82 on: December 14, 2019, 11:07:46 pm »
does the 30-50v hv+ connection require a regulator or just smoothed/filtered dc?

another poster built a linear psu by rewinding a secondary on a transformer sadly he didn't provide much info on how he built it
I have yet to find any info on the hv side some say 35v 10 amp others 48v 70v I would imagine there would be some kind of regulation on this portion
a switching psu is likely easier to buy but a linear psu is simpler to build from spare parts just to see if the amp is functional...
the 12v,5v regulators could likely be found in an old computer psu along with caps and other parts..
there is a possibility with any psu to have "noise" its a debatable topic as fords vs chevy debate will forever be debated...

you can also find dvd player psu produce 12v,5v via a linear psu
I did try to power the 5v and 12v from a separate psu but as ciine mentioned they have to be stable and this option dont work unless you could power both on at the same time and maintain the voltage


 

Offline demail2006

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #83 on: January 03, 2020, 06:21:42 pm »
My logitech z906 does not provide any sound from speakers, However input and output to headphones are working fine. I assume all other functions will also work fine.

I checked power supply and voltages. I get all voltage ok i.e. 2x 46 volts and 12 volt and 5 volt is dropping to 4.5 to 4 or below volts. I also have 3.3 volt standby voltage.

I even tried external 5v supply provided by 1 amp mobile charger, not working.

When I check voltage on speakers voltages are all over the place when tested for + and - it shows -7.5 volts some time on all speakers not connected and 0.0 on connected one and sometimes all shows +22, 5, 10 volts it's going all over the place  :scared:.

I checked main pcb 100v capacitors and they got 46v on them.

please help in fixing issues where should I start checking for faults.

« Last Edit: January 03, 2020, 06:29:58 pm by demail2006 »
 

Offline tunk

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #84 on: January 03, 2020, 06:44:48 pm »
I don't know what's the problem is, but I think you should start with setting your DMM to Vac.
And maybe feed it with e.g. a 1kHz sine signal.

Edit: if the headphone socket has a (logical) switch, check it.
« Last Edit: January 03, 2020, 06:53:20 pm by tunk »
 

Offline demail2006

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #85 on: January 03, 2020, 09:32:51 pm »
Thanks for your suggestion, My knowledge to repairing is limited. I believe you are asking me to provide a 1khz sine signal form oscilloscope and then check from Digital Multi Meter.

Unfortunately I do not have a oscilloscope with me.

Regarding headphone socket logical switch I have no idea I need to check on that. If post pictures of console PCB will that help? Headphone jack is in the console.

Following is the picture of console PCB from a Reddit thread.

https://preview.redd.it/xfs8sjze2oh11.png?width=4032&format=png&auto=webp&s=bcec99bd9319847b3d9987c346a087feaa43a0e4
 

Offline tunk

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #86 on: January 03, 2020, 10:47:48 pm »
First, I don't really have a clue about this.
Do a web search for a 1kHz sine mp3-file and use that as input (from your phone?).
When you insert the headphone are the speakers muted? If so, there's some kind
of switch which does this, and if this is defect ...
 

Offline BISZAK

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  • Country: ro
Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #87 on: January 27, 2021, 08:13:00 pm »
Hi guys!

Can someone help me about some resistors, because my power supply burnt quite badly, and can't find any of these values
TP29;TP32;TP33;TP35;TP5?;TP97;TP48
these are near the big metal heating panel
Thank you!
 

Offline Dinesh6252

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Re: Help Required - Repairing a Logitech Z906 Speaker
« Reply #88 on: April 14, 2021, 04:47:50 am »
Hello, just a quick question if someone can tell if i can supply 54V on HV+  line since, I have a 54+ that I want to use.
 


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