Re: [SlimDevices: Boom] Boom Died...

[rodry]

:eek: ... in these days I think to put HifyBerry inside my boom: i try
to use line in and for a strange reason it resuscitates... I think it's
an easter effect



Boom Dead - Touch - Radio

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Re: [SlimDevices: Boom] Boom Died...

[JoeMuc2009]

This isn't taking a good direction. BPA may be right eventually! I have
spent days analyzing defective Boom boards and to my surprise never
found a single classic voltage regulator. Up to now I thought this
probably indicates a very low tolerance towards other voltages than
specified. But found quite the opposite when I reviewed it today.
There are multiple converters, and that's all I could find that deals
with power rail generation:

*U3*: TI TPS61080: HIGH VOLTAGE DC/DC BOOST CONVERTER WITH 0.5-A/1.3-A
INTEGRATED SWITCH
generates +55V grid voltage for the VFD, takes _up_to_6V_ input, is
not directly connected to +12V rail but fed from U10

*U7*: TI TPS40222: 1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm × 3 mm SON
PACKAGE
probably dedicated to creating CPU voltages (1.2 / 3.3V), takes
_up_to_8V_ input, is not directly connected to +12V rail but fed from
U10

*U10*: TI TPS54286: 2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED
HIGH-SIDE MOSFET
probably the main regulator, takes _up_to_30V_input_, is directly
connected to the +12V power jack
half of U10 is creating supply voltage of 3.3V for the majority of
the ICs on the board such as

- U12 (Realtek NIC)
- U14 (Xilinx FPGA)
- the obscure U13 (SN0801033) I cannot find any datasheet for
- U26 (Flash EEPROM)
- U25 (DRAM)
- and some more.
  
the other half creates the supply voltage (+5V I think) for U3 and
U7.

Furthermore, directly connected to the input +12V are the digital
amplifier chips:

*U9*: TI TPA3100D2: 20-W STEREO CLASS-D AUDIO POWER AMPLIFIER (for bass
woofers)
*U11*: TI TPA3101D2: 10-W STEREO CLASS-D AUDIO POWER AMPLIFIER (for
tweeters)

U9 and U11 both tolerate input up to 26V.

So yeah, actually I cannot see a reason after all why more than +12V
input should do any harm. All the regulating components which are in the
path of the +12V input rail are capable of taking more than double that.
It seems there is no sensitive component directly attached to the input
jack that would not tolerate a good amount more than +12V.
Certainly one should not generally assume that each low-voltage device
can take an arbitrary amount of more voltage than the label on the box
says but in this case we have a good margin.
I don't have any schematics by the way. Just like everybody else I'm
condemned to reverse engineering, and not particularly good at it.
Please don't take my word for granted.



PN me if your Boom / Classic / Transporter display has issues!

LMS 7.9.0 on Windows Server 2012
1x Squezeebox Classic SB2
7x Squeezebox Classic SB3 (one waiting for repair)
7x Squeezebox Boom (two waiting for repair)
1x Transporter
2x Controller (one waiting for repair)
3x Touch (two waiting for repair)
1x Radio

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Re: [SlimDevices: Boom] Boom Died...

[bpa]

djringjr wrote: 
> 
> You cannot do what you wrote.  The Boom PSU is 12 VDC, it will not put
> out
> 18 VDC ever.
> 
> Plugging in the Radio PSU which is 50% higher voltage the Boom requires
> will likely destroy the Boom.
> 

I never said the same PSU put out two voltages.
I have two Booms
- a pre=produciton units as I was part of beta test which has a 18V PSU
original supplied by Slimdevices
- a production unit which has a 12V PSU original  supplied by
Slimdevices.

Plugging in 18V will not destroy the boom as the internal voltage
regulators are able to cope with 18V

Look back in the forum and you will there are many post where users have
created supplies - battery and otherwise which suppied at more than 12V

I am stating the facts.



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Re: [SlimDevices: Boom] Boom Died...

[D.J.J. Ring, Jr.]

On Feb 12, 2018 7:10 AM, "bpa" 
wrote:
>
>
> The plug are compatible but that does not means the amps are
> sufficient.
>
> The PSU for Radio is rated at 18v @ 1A
>
> Boom PSU is 12V @2.5A or 18V @ 1.67A
>
> So using Radio PSU would probably not have enough power.
>
>
> 

BPA,

I have never seen anyone answer a technical question with such lack of
technical understanding.

You cannot do what you wrote.  The Boom PSU is 12 VDC, it will not put out
18 VDC ever.

Plugging in the Radio PSU which is 50% higher voltage the Boom requires
will likely destroy the Boom.

If the original poster did what you suggested, he would likely destroy his
Boom and you would be responsible.

Please do not answer technical questions when you don't even understand
fundamental DC voltage laws.

Go take a electronics course please.

Thank you,

David
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Re: [SlimDevices: Boom] Boom Died...

[Man in a van]

I have just checked the Italian site without any luck, but the still
have some for sale in Germany

http://support.logitech.com/de_de/parts#5main-a

If you want to check for other countries, scroll to the bottom of the
page and click on the displayed country flag.

Ronnie



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