Emax

Does anyone here happen to know what voltage the inverter for the Emax II backlight runs on?
I want to replace mine with one of the silent SMD ones from backlights4u but the smaller one
can't run on 5V and the Emax II one might just run on 5V.

If no one knows I'll get the board out and find out, but would safe time if someone does.

Louis

5v only on the emax but you can fit a 3v version but you need to add a pot or resister to bring it down to 3v

  ----- Original Message ----- 
  From: Louis van Dompselaar 
  To: emax@yahoogroups.com 
  Sent: Wednesday, November 17, 2010 9:21 AM
  Subject: [emax] Emax II backlight inverter


    
  Does anyone here happen to know what voltage the inverter for the Emax II backlight runs on?
  I want to replace mine with one of the silent SMD ones from backlights4u but the smaller one
  can't run on 5V and the Emax II one might just run on 5V.

  If no one knows I'll get the board out and find out, but would safe time if someone does.

  Louis



  


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[Non-text portions of this message have been removed]

Thanks Jammie

It has a new backlight and new sliders so it was annoying that the new backlight actually made the whining worse,
so much so that I actually can't have it on without getting a headache... (and I'm not mentioning what it does to the cats...)


Op 17 nov 2010, om 14:33 heeft jammie het volgende geschreven:

> 5v only on the emax but you can fit a 3v version but you need to add a pot or resister to bring it down to 3v
> 
> 



[Non-text portions of this message have been removed]

Although having written what I did below, I must admit that my last attempt yesterday has worked better than expected.
I pumped the transformer in the inverter full of plastic spray (the one you use to coat PCB's with) yesterday.
This has now hardened and has almost completely silenced it.

Oh well, trust me to check that AFTER ordering the new inverters... 


Op 17 nov 2010, om 19:05 heeft Louis van Dompselaar het volgende geschreven:

> Thanks Jammie
> 
> It has a new backlight and new sliders so it was annoying that the new backlight actually made the whining worse,
> so much so that I actually can't have it on without getting a headache... (and I'm not mentioning what it does to the cats...)
> 
> 



[Non-text portions of this message have been removed]

are you sure it is the backlight and not the Inverter block on the main
logic going bad?
That is a part easy to replace that can also cause noise as it vibrates due
to the transformer....

just a thought

Ted


On Wed, Nov 17, 2010 at 10:05 AM, Louis van Dompselaar <louis@...
> wrote:

>
>
> Thanks Jammie
>
> It has a new backlight and new sliders so it was annoying that the new
> backlight actually made the whining worse,
> so much so that I actually can't have it on without getting a headache...
> (and I'm not mentioning what it does to the cats...)
>
> Op 17 nov 2010, om 14:33 heeft jammie het volgende geschreven:
>
> > 5v only on the emax but you can fit a 3v version but you need to add a
> pot or resister to bring it down to 3v
> >
> >
>
> [Non-text portions of this message have been removed]
>
>  
>


[Non-text portions of this message have been removed]

It *is* the inverter that is causing the noise.
That's why I'm looking to replace it...

Op 17 nov 2010, om 19:51 heeft Ted Summers het volgende geschreven:

> are you sure it is the backlight and not the Inverter block on the main
> logic going bad?
> That is a part easy to replace that can also cause noise as it vibrates due
> to the transformer....
> 
> just a thought
> 
> Ted

can someone share the name of a matching inverter for the PC1602AR-H
<http://gx.rs-online.com/web/search/searchBrowseAction.html?method=searc\
hProducts&searchTerm=PC1602AR-H&x=0&y=0>   for emax i keyboard?





--- In emax@yahoogroups.com, Louis van Dompselaar <louis@...> wrote:
>
> It *is* the inverter that is causing the noise.
> That's why I'm looking to replace it...
>
> Op 17 nov 2010, om 19:51 heeft Ted Summers het volgende geschreven:
>
> > are you sure it is the backlight and not the Inverter block on the
main
> > logic going bad?
> > That is a part easy to replace that can also cause noise as it
vibrates due
> > to the transformer....
> >
> > just a thought
> >
> > Ted
>



[Non-text portions of this message have been removed]

digi-key or mouser.com..... that is where I got mine....

On Wed, Nov 17, 2010 at 10:59 AM, Louis van Dompselaar <louis@...
> wrote:

>
>
> It *is* the inverter that is causing the noise.
> That's why I'm looking to replace it...
>
> Op 17 nov 2010, om 19:51 heeft Ted Summers het volgende geschreven:
>
>
> > are you sure it is the backlight and not the Inverter block on the main
> > logic going bad?
> > That is a part easy to replace that can also cause noise as it vibrates
> due
> > to the transformer....
> >
> > just a thought
> >
> > Ted
>
>  
>


[Non-text portions of this message have been removed]

the inverter only changes the voltage for the contrast of the lcd remember from + to negative which was how the old lcd worked

the efoil converter is a power switching transistor and a step up transformer so that it can take a 5v signal and change it into a 5v ac signal which is then aplified by the step up transformer for the correct required voltage for thwe efoil to produce light 

this is on the main board its a green square this is the item that produces a whine when you loose the backlight they also can get dammaged from a backlight fading for to long the produce a high pitched humb

  ----- Original Message ----- 
  From: Louis van Dompselaar 
  To: emax@yahoogroups.com 
  Sent: Wednesday, November 17, 2010 6:59 PM
  Subject: Re: [emax] Emax II backlight inverter


    
  It *is* the inverter that is causing the noise.
  That's why I'm looking to replace it...

  Op 17 nov 2010, om 19:51 heeft Ted Summers het volgende geschreven:

  > are you sure it is the backlight and not the Inverter block on the main
  > logic going bad?
  > That is a part easy to replace that can also cause noise as it vibrates due
  > to the transformer....
  > 
  > just a thought
  > 
  > Ted



  


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  No virus found in this incoming message.
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  Version: 8.5.449 / Virus Database: 271.1.1/3262 - Release Date: 11/17/10 07:34:00


[Non-text portions of this message have been removed]

they dont use an inverter as it use +4.7 max voltage and need to have a pot from +5v source and ground and ythe wiper goes to pin 3

  ----- Original Message ----- 
  From: dutchbeats 
  To: emax@yahoogroups.com 
  Sent: Wednesday, November 17, 2010 8:29 PM
  Subject: [emax] Re: Emax II backlight inverter


    
  can someone share the name of a matching inverter for the PC1602AR-H
  <http://gx.rs-online.com/web/search/searchBrowseAction.html?method=searc\
  hProducts&searchTerm=PC1602AR-H&x=0&y=0> for emax i keyboard?

  --- In emax@yahoogroups.com, Louis van Dompselaar <louis@...> wrote:
  >
  > It *is* the inverter that is causing the noise.
  > That's why I'm looking to replace it...
  >
  > Op 17 nov 2010, om 19:51 heeft Ted Summers het volgende geschreven:
  >
  > > are you sure it is the backlight and not the Inverter block on the
  main
  > > logic going bad?
  > > That is a part easy to replace that can also cause noise as it
  vibrates due
  > > to the transformer....
  > >
  > > just a thought
  > >
  > > Ted
  >

  [Non-text portions of this message have been removed]



  


------------------------------------------------------------------------------



  No virus found in this incoming message.
  Checked by AVG - www.avg.com 
  Version: 8.5.449 / Virus Database: 271.1.1/3262 - Release Date: 11/17/10 07:34:00


[Non-text portions of this message have been removed]