Logitech Z506 power supply

[melih]

Re: Logitech Z506 power supply

Here update guys i Fixed the power supply with almost same qualifications but somehow my bass quality dropped other amfi system works fine just bass not satisfying my requirements

[melih]

Re: Logitech Z506 power supply

Hi, Forum now i found replacement power supply for same sound system here is details this one dont have malfunctions and output is 16,7 volt. Is it correct.

[melih]

Re: Logitech Z506 power supply

This is not a bad idea, but you can also find the faulty one with IR termometer or multimeter with K type temperature probe.

You either use 7812 Voltage regulator or resistor divider or just a second 12V power adapter. Or if you prefer buck converter.

Actually before i can able to buy 12v adapter but here some people try with higher voltage i dont know at home im gonna check there is some 12v adapter

[televizora]

Re: Logitech Z506 power supply

Result is same guys im gonna buy freezer spray and test it which one get defected.

This is not a bad idea, but you can also find the faulty one with IR termometer or multimeter with K type temperature probe.

How i can downgrade 19 volt to 12 volt i could do i searched but didint understand from pages or selling some products has eligible to adjust voltage exit.

You either use 7812 Voltage regulator or resistor divider or just a second 12V power adapter. Or if you prefer buck converter.

[melih]

Re: Logitech Z506 power supply

Result is same guys im gonna buy freezer spray and test it which one get defected.

[melih]

Re: Logitech Z506 power supply

Don't run 12V fan at 19V. Also, my first suggestion would have been ghetto mod with a fan.
But wanted to approach the problem intelligently.

How i can downgrade 19 volt to 12 volt i could do i searched but didint understand from pages or selling some products has eligible to adjust voltage exit.

[televizora]

Re: Logitech Z506 power supply

Hell guys now i refreshed thermal paste on the aluminum board and plus i addes fan inside the box lets what will happen if it continue like that im gonna change both chips. Hopefully its not goes this way Thank a lot i didint feel alone on this way I forgot to take photos but i used old model 12 vold DC fan along with Pentium 4 aluminum case fan is turning fast but not so fast im gonna test it.

Don't run 12V fan at 19V. Also, my first suggestion would have been ghetto mod with a fan.
But wanted to approach the problem intelligently.

[melih]

Re: Logitech Z506 power supply

Hell guys now i refreshed thermal paste on the aluminum board and plus i addes fan inside the box lets what will happen if it continue like that im gonna change both chips. Hopefully its not goes this way Thank a lot i didint feel alone on this way I forgot to take photos but i used old model 12 vold DC fan along with Pentium 4 aluminum case fan is turning fast but not so fast im gonna test it.

[televizora]

Re: Logitech Z506 power supply

The STA540 has integrated thermal cutoff at 150C.
The temperature is extremely high for normal operation.
Use IR thermometer to measure the temperature.
Check voltages to the STA540.
Almost all the time, this kind of malfunctions are due to bad STA/STK/TDA amplifier chip.
150C is not too hot. It's almost melting the solder.
Boards with amplifier IC-s are pretty simple. Almost always it's the STA/STK/TDA fault.

[Agent24]

Re: Logitech Z506 power supply

Do you have or can you get freezer spray? That can help find an overheating issue.

[melih]

Re: Logitech Z506 power supply

Describe your problem, please. What you have done, how it stops working and etc.

Now i installed Dell Laptop Adapter wich is 19.5 volt 3,34a now working properly but after 3-4 hours need to cooldown 5-10 min so after i can use without problems. On board there is STA540 modules maybe getting too hot i dont know. Others looking fine.

[televizora]

Re: Logitech Z506 power supply

What im gonna do now i dont know

Describe your problem, please. What you have done, how it stops working and etc.

[melih]

Re: Logitech Z506 power supply

Hi, Guys new update before sound system was working around 45 min after power supply i updated with brand new notebook adapter. Now working only 3 hours after cooldown will work again 3-4 hours now What im gonna do now i dont know

[melih]

Re: Logitech Z506 power supply

Does the power supply still output correct voltage after the speaker stops working? Then you can find if it's a power supply or speaker problem.

It seems these can handle 19v OK, going by the earlier posts in this thread, so you could test it with the laptop charger, sure.

Yea i dont want to burned out the speaker system because here currency issues they get expensive now. So if this laptop charger is okay im gonna buy it and mount inside box everything will be fine. Hopefully

[Agent24]

Re: Logitech Z506 power supply

Does the power supply still output correct voltage after the speaker stops working? Then you can find if it's a power supply or speaker problem.

It seems these can handle 19v OK, going by the earlier posts in this thread, so you could test it with the laptop charger, sure.

[melih]

Re: Logitech Z506 power supply

Pictures added. Other components i didint checked but everything seems okay. I am curious about what values needs for that bobin coil. I brought some componenets whihc i can able to read. I am adding their photos too but i learned values from this forum.

Bobbin Coil shop seller talked about 100 something like that i dont know which i brought there is no value on it.

[Agent24]

Re: Logitech Z506 power supply

Please add photos in another post - on your first post I don't think you can add pictures but after that you can.

Do you have freezer spray? You may try to use that to find an overheating issue...

[melih]

Re: Logitech Z506 power supply

Sorry to wake up this old topic but even me i have same problem guys hopefully will help to others so that's why im putting here. My problem is this sound system working only 45min or 1 hour after sound not coming at all when im unplugging the power cable after cooling down i can able to listen music.

At home there is one Laptop Adapter 19v 4.74a i dont know it is suitable or not but with calculation around 90w.

If this Power unit able to repairable i can do just here im wondering about radial leaded bobin coil and FUSE %100 gone. My thoughts is this bobin coil values i dont know them they used normal cover on it no values burned all.

Here some pictures. If anyone have circuit diagram with all values about component i will be grateful.

[momaka]

Re: Logitech Z506 power supply

A little late of a reply, but here it is anyways...

I would also like to ask that the power supply is a resistor R2 . How many and what kind ohms could be done instead ?
Thanks!

R2 = 10 Ohms, 5%, and 2 or 3 Watt (not sure about that one)

Also read the first page of this thread again. Apparently diode D5 likes to go bad too sometimes when R2 fails. So make sure to check D5 and replace if bad. Th3_uN1Qu3 used a 3A 1000V fast recovery diode and reported good results, so you may want to use something similar for D5 (i.e. something like a HER307, PR3007G, etc.)

[andris0]

Re: Logitech Z506 power supply

I would also like to ask that the power supply is a resistor R2 . How many and what kind ohms could be done instead ?
Thanks!