[ICOM] ICOM 746PRO Screen Brightness from K3JK

[Dick Flanagan]

My understanding is that the display module is a 
constant-current assembly.  What power isn't 
dissipated by the display is dissipated by a 
discrete component behind the display.  The 
brighter the display--the more current it 
uses--the less power that needs to be dissipated 
by this other discrete component.

The problem originates when the heat-dissipating 
component behind (I'm not sure exactly where it 
is) the display has to dissipate too much heat 
for too long.  Maximizing the screen brightness 
has the effect of reducing the heat that needs to 
be dissipated by this second component.  Ergo, it 
lasts longer and the display assembly lasts longer.

I have a friend who would leave his radio on 24/7 
and only turn the display brightness down when he 
wasn't using it (didn't want to "burn the 
display").  When he eventually received his radio 
back from ICOM Service, they told him to leave the brightness up.  :)

Dick

At 04:13 AM 11/18/2008, · Don Joe · eM at ilman  ' LU1ARV ' wrote:
 >Hello Vlad!
 >In IC-756: It is an adjustment problem practice of the user or it was
 >a problem of the LCD installed by Icom. Strange that didn't have
 >necessity to change it.
 >Already for these years it should not have problems!!
 >José, tks
 >
 >
 >> I used to have an IC-756. A couple of years after I started using it with
 >> the brightness set up at maximum, there came the blue lines on the LCD.
 >> After some adjustments of brightness and contrast I managed to find a
 >> combination where the lines disappeared. Then the radio has been sold. The
 >> actual user is still running the radio 
keeping these adjustments untouched,
 >> and there are no blue lines seen ever since. 
Indeed, the brightness is below
 >> the maximum.
 >>
 >> 73,
 >> Vladimir VE3IAE
 >>
 >> ---
 >>
 >>>>> It is a well known fact that the brightness setting needs to be set at
 >>>>> 100 percent per ICOM. The contrast setting has nothing to do with the
 >>>>> possible failure, Gil
 >>
 >> --- On Tue, 11/18/08, · Don Joe · eM at ilman  ' LU1ARV '
 >> <estacion at bsmail.com.ar> wrote:
 >>
 >>> From: · Don Joe · eM at ilman  ' LU1ARV ' <estacion at bsmail.com.ar>
 >>> Subject: [ICOM] ICOM  746PRO Screen Brightness from  K3JK
 >>> To: "ICOM Reflector" <icom at mailman.qth.net>
 >>> Date: Tuesday, November 18, 2008, 5:41 AM
 >>> Hello! But, then it doesn't suit, it doesn't serve,
 >>> to give him little-few shine to save the LCD screen ? There
 >>> is that configurate at 50% bright and 50% contrast or
 >>> more...? What parameters ?
 >>> Thanks
 >>> José
 >>>
 >>>
 >>>
 >>> > thank you Ed for relating that information about the
 >>> screen brightness.
 >>> > John K3JK
 >>> >
 >>> > ----- Original Message -----
 >>> > From: "Ed Myers" <emyers2 at cox.net>
 >>> > To: <icom at mailman.qth.net>
 >>> > Sent: Tuesday, November 18, 2008 12:38 AM
 >>> > Subject: [ICOM] RE: ICOM 746PRO Screen Brightness from
 >>> K3JK
 >>> >
 >>> >> My 746 PRO has been repaired by an ICOM service
 >>> facility after a display
 >>> >> illumination failure.
 >>> >> I was instructed to run the display at full
 >>> brightness to preclude another
 >>> >> failure.
 >>> >>
 >>> >> Ed WC4TT
 >
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Dick Flanagan K7VC
dick at k7vc.com