Hacking the Logitech Z5500

[adrian_vista]

try with pin 6 it may work

 

[xavijs]

I don't have PIN6

I test all the wires with my tester and tester doesn't sound PIIIIII..

My wires of "control" are 7,8 and 12. I think my pin12 is like PIN6 of other systems.

In this xmas holidays I will open my subwoffer and look for any broken component. I think my problem begin into the amplifier...


Thanks Adrian Vista. I will post my progress here too

 

[xavijs]

I could not wait

I opened the subwoffer and have not found anything bad . Here I leave some photos taken of the subwoffer PCB now.

The problem I have now is that when I touch with my finger the signal wires for each of the 5 speakers would have to hear a buzz. Well, that makes it buzz only when I touch the blue wire, which is the center speaker, it is as if the other speakers were not connected ...

The photos:
you can find something bad?

Gallery:

ImageShack -

Direct Links:

http://img300.imageshack.us/img300/4986/19122009339.jpg
http://img42.imageshack.us/img42/4264/19122009340.jpg
http://img300.imageshack.us/img300/659/19122009341.jpg
http://img38.imageshack.us/img38/9837/19122009342.jpg



Thank you.

This is an automatic translation from Spanish to English. Reviewed by me and I think this well written

 

[adrian_vista]

I have spring clip version but the board with the vga connector looks different
http://i49.tinypic.com/2rgks9g.jpg
on my version pin 12 is from a input
sure you have spring clip version?
or maybe my version is old and they changed some things

 

[xavijs]

My speakers are 4 years old.

My subwoffer is like that:

http://www.theinquirer.net/img/6686/logitech_z-5500_01.jpg

Where can I loof for issues? I'm little bit lost..


Thanks!

 

[adrian_vista]

post a image like firs but with the other side
is another way to turn on the amps
to connect the white wire(on my system) to +8v
if not working you must connect the white with black wire to gnd and it will work
take care when i turnned on the tda's and the stabilizer was heating fast

 

[adrian_vista]

firs post the image so I can see the wire connections

 

[xavijs]

Ok, I take 4 photos. These are the conections.

Gallery: ImageShack -

 

[adrian_vista]

ok i will study them to see what is going on

 

[adrian_vista]

http://img69.imageshack.us/img69/4986/19122009339.jpg
Try this disconnect that wire from board
Connect pin 12 to gnd(pin 13)
the disconnected wire connect-it to +8v
see if all channels have sound
this works in my version

 

[xavijs]

Ok,

I did that:

The wire marked on the photo (white wire) connected to +8v. And wire 12 (white-black) connected to GND.

If I do that, all the speakers buzz. BUUUUUUUUUUUUU..... and I'm not touching any signal wire :S

 

[xavijs]

Oh, oh. I think that I have found the correct wire.

Is blue wire. When I connect to 8+ the speakers are buzzing too. but I think that is because I have the signals "in the air". I will prove to connect all signals to GND.

 

[adrian_vista]

did you desolded that wire? must not be connected to that board

 

[adrian_vista]

try input music and see if it sounds good

 

[xavijs]

I have to dessold this wire?? but if I dessold this wire and then connect to the same wire to GND there is no conection no?


Wire dessolated ------------------ GND

There is no sound . I have connected all the wires to the pod but signal wires no. Now, I can turn ON the speakers correctly, but if I touch the signal wires the speakers doesn't buzz! :S. I don't know what's wrong...


Thanks.

 

[adrian_vista]

you can try without pin 12 to gnd(probably won't work)
the white ,blue,orange disconnected and connected to 8v
you may have something broken on that board so it may cause malfunction

 

[adrian_vista]

it must work
if not working replace that IC on the board it may cause problems
after replace try how you did when you only hear center speaker

 

[xavijs]

If I connect the blue wire (i think is PIN8) All the speakers sound, incude the subwoffer. And they are buzzing, buuuuuuuuuuuuu....

And with this wire, if I touch any signal wire, the speaker of this wire sounds PFPFFFFfffPFP . And the same for the subwoffer.

To eliminate this buuuuuuuu.... I have to connect the subwoffer signal to gnd or any signal and this buuuuuu.. disapear. I have to buy a 10kpot for subwoffer signal.

Thanks!

 

[adrian_vista]

so it's working
try to imput signal directly to that board not trough console
if console not working signall won't get out trough vga cable

 

[adrian_vista]

did you test with music?