Help Required - Repairing a Logitech Z906 Speaker

[nirvanha]

I resolved, I rebuilt a Chinese source for 200W at full power 400w
with the following voltages:
-5V 1A
12V 1A
-40v 10A
It works perfectly

Hello there,

Where can I buy this power source?

Could you specify the power supply model?

Please help me, I need a lot of help to have fun.

Thank you.

I'm sorry for the bad english.

[Zeth89]

Hi, can you pls help me? i have the 5+/12v/+46v/+46v from the main connector of the psu, but i still can't power on the z906, what more do I need?
i can read from the other connector that theres a "3.3v keep alive" labeled cable, and i have no volt from there. is that the problem? pls help me
 
in this picture i marked the other connector I am talking about.
what voltage do I need from this other connector?

[Zeth89]

pls help :c here's my email if u can contact me pls zeth89@gmail.com

[Daniel RR]

Hello gentlemans, i'm new here, few days ago a friend of mine gave me for free a Logitech Z906 that has some problems

Problem 1 - working for 20 seconds the shuts off and never start again untill next day. I've opened the rear sub box, discharged  capacitors and check for faults. I have found the 470uF @ 16v capacitor bulged and r79 and r80 resistors (560ohm, 2watt) with ceramic falling off, i've changed the capacitor/resistors but now i'm facing the problem of "3 led on the console" problem, with multimeter i checked the black cables that enter in the amp from psu and i find 1.7v instead of 5v terminal, going back untill i find the Lm1117s 5v 0.8amp voltage regulator, on the input i've got only 6v instead of 8+ volt.. I've powered Lm1117s separately with a 9v 1604 battery on input and on the output i have 4.97 (yay, i was concerned that Lm1117 was blown too)

My question is: what can i do more to have +8v (or more) on the input of the Lm1117?

PS : first i was thinking to power the spot of the output of Lm1117s with a 5v 800 mA phone charger, second thought was adapting a Pc corsair hx650 psu and trow away full-of-glue-cr*p-and-no radiators Logitech psu.

[ciine]

You need a voltage  3.3 V, it is a standby voltage.
That's why you either put a 3.3 V CI source (voltage regulator) on the 5v branch or another source that permanently secures this voltage
This voltage ensures the CPU standby and make on/off function.

[ciine]

I resolved, I rebuilt a Chinese source for 200W at full power 400w
with the following voltages:
-5V 1A
12V 1A
-40v 10A
It works perfectly

Hello there,

Where can I buy this power source?

Could you specify the power supply model?

Please help me, I need a lot of help to have fun.

Thank you.

I'm sorry for the bad english.

This source is made to us personally, you can not find it buy it

[ciine]

Hello gentlemans, i'm new here, few days ago a friend of mine gave me for free a Logitech Z906 that has some problems

Problem 1 - working for 20 seconds the shuts off and never start again untill next day. I've opened the rear sub box, discharged  capacitors and check for faults. I have found the 470uF @ 16v capacitor bulged and r79 and r80 resistors (560ohm, 2watt) with ceramic falling off, i've changed the capacitor/resistors but now i'm facing the problem of "3 led on the console" problem, with multimeter i checked the black cables that enter in the amp from psu and i find 1.7v instead of 5v terminal, going back untill i find the Lm1117s 5v 0.8amp voltage regulator, on the input i've got only 6v instead of 8+ volt.. I've powered Lm1117s separately with a 9v 1604 battery on input and on the output i have 4.97 (yay, i was concerned that Lm1117 was blown too)

My question is: what can i do more to have +8v (or more) on the input of the Lm1117?

PS : first i was thinking to power the spot of the output of Lm1117s with a 5v 800 mA phone charger, second thought was adapting a Pc corsair hx650 psu and trow away full-of-glue-cr*p-and-no radiators Logitech psu.

Prietene Lm1117s este un regulator de voltaj care este fabricat in  mai multe variante de tensiune.
Tu esti sigur ca e vorba de varianta de 5 v???

[Zeth89]

You need a voltage  3.3 V, it is a standby voltage.
That's why you either put a 3.3 V CI source (voltage regulator) on the 5v branch or another source that permanently secures this voltage
This voltage ensures the CPU standby and make on/off function.

man i love you, thank you for clearing that up to me, so it seams that the reason my z906 is not working is that i dont have that 3.3v then, because i have all the other voltages coming out from the psu to the main board, i replaced the 47uf cap that has blown away, but i still have no voltage from that 3.3v cable, is it only one cable? what are the others cables for? i mean from the secundary cable that connects the psu to the mainboard, the smaller connector has like 4 or five pines too, im trying to figure out how to send the 3.3v needed. i have all the other voltages from the main connector (5/12/46/46v)
sorry for my english again, and ty for your help

[ciine]

I do not know how the original source how is made, because I did not have it, that's why we made it other power source.
Normally, the 3.3 V voltage is obtained by a LM or other type regulator from the 5 V voltage.
If you look closely at the photos, you see the 3.3v source mounted by me , powered by the 5v branch and providing the standby voltage (3.3v)

[Zeth89]

I do not know how the original source how is made, because I did not have it, that's why we made it other power source.
Normally, the 3.3 V voltage is obtained by a LM or other type regulator from the 5 V voltage.
If you look closely at the photos, you see the 3.3v source mounted by me , powered by the 5v branch and providing the standby voltage (3.3v)

Oh I see, can you pls tellme which type of regulator are you using? and if is not too much to ask, if you can show me how you conected to the main board i cannot see it from the other pictures so i can try to do the same to see at least if it powers on

[ciine]

Any type of regulator for 3.3v you have.
If you have any mounting problems, download the datasheet for the voltage regulator.
you read datasheet ,identify terminals and how they connect

[Zeth89]

Any type of regulator for 3.3v you have.
If you have any mounting problems, download the datasheet for the voltage regulator.
you read datasheet ,identify terminals and how they connect

the thing is that i don't have any hehe, i will go and buy one, but i am not shure which one, i google some lm regulator for 3.3v and i found the LM7833, but i'm not shure if this one is going to support the 5v of my psu, im not shure about its current output,  and if i need something else, (like resistors or any cap for something i read about "Coupling capacitors and capacitors dividers" or if this is not necesary and the lm7833 or another LM that you recomend me would be enough.

sorry im really new in this, ty for your time

[Zeth89]

well, something went wrong, now the psu is not working, don't have volts on any lane, and the smd resistors are sparkling, so i call it done, i need a replacement for this psu, can you pls tell me witch one did you use? what kind of psu do i need for modding to make this amp working again? is it something like this going to work? http://www.ebay.com/itm/800W-48V-DIY-High-quality-HIFI-Amp-PSU-LLC-Soft-Switching-Power-Supply-Board-/311911469622?hash=item489f5f5236:g:hzIAAOSwT9lZeWIy
:c

[ciine]

Because you do not understand the electronics very well you do the following:
- a switching source (a simple switching switch with voltages of 5v / 1A and 12v / 1A) a LM7833 for the 3.3v voltage (you have the datasheet here http://www.taitroncomponents.com/catalog/Datasheet/LM7833. pdf
Connection scheme on page 4)
-a 28-30v CA / 6A toroidal transformer at which you put a bridge and a 10000 / 50v convector for the 40v voltage

[harrysharma006]

hlwww sir i want to know values on logitech z906 speakers power supply board plzzzzzz help me sir........

1.C31
2.C47
3.D8

[harrysharma006]

hlwww sir i want to know values on logitech z906 speakers power supply board plzzzzzz help me sir....

1.C31
2.C47
3.D8

[clwas1]

I am new to this forum, but with the same problem, a blown Z906 power supply.  In my case, it looks like the two fuses blew out along with the part RV1.  The fuses are easy to replace, but does anyone know what a suitable replacement part would be for RV1?  The letters on the attached blown out part are:

LF or IF
P150L18
1328
 
Thanks.

[Rasz]

it looks like the two fuses blew out along with the part RV1.  The fuses are easy to replace, but does anyone know what a suitable replacement part would be for RV1?

its a MOV, those things dont blow  on a whim, your supply is most likely shorted

[harrysharma006]

hlwww sir i want to know values on logitech z906 speakers power supply board plzzzzzz help me sir........

1.C31
2.C47
3.D8

[clwas1]

Thanks.  That maybe so, but I would like to replace the part if possible.  I'll test everything before I switch on the power!  What's an MOV and where can I get a replacement?

Thanks again.

[clwas1]

I wanted to post an update.  I successfully replaced the two on board axial fuses + the MOV part (RV1).  The system is now working again.  The MOV actually did it's job when the power surge hit, but it was a pain to find and replace it.  For anyone else. the link where I got it is here:

http://www.mouser.com/search/ProductDetail.aspx?r=576-V150LA10AP

Thanks for the posts, it was helpful.

[a3762341]

Hey guys I'm just fix my z906 with other psu (48V 350w),and two AC to dc adapters(12v&5v),but i keep 5v back to original power board and connect the another connector with original power board  that zeth9 said.

[Costy91]

Can I have a hand with my logitech z906. It just refuses to turn on. I opened it and you can see in the atached picture what happened. Is it fixable? Thank you

[ciine]

Thanks.  That maybe so, but I would like to replace the part if possible.  I'll test everything before I switch on the power!  What's an MOV and where can I get a replacement?

Thanks again.

Download datasheet for the integrated and for the source and see what values are there.

[Costy91]

Where can I find the datasheet for the integrated and for the source?