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Old 14th September 2012, 09:16 AM   #1
diyAudio Member
 
Join Date: Jun 2010
Red face creative soundworks 740 screen parts /replace

hey all

i have the creative soundworks 740 cd radio , the display has gone dim on one side only

ive broken it down so far in the hopes i can fix it

a,would this screen be custom to the unit or likley i can source a replacement ?

b, are there any replacable parts inside the black screen ?

Click the image to open in full size.

Click the image to open in full size.

any help apreciated
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Old 19th September 2012, 04:50 PM   #2
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Join Date: Jun 2010
heres some pics

anyone recognise any of the numbers ?

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 28th December 2013, 10:37 AM   #3
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Join Date: Dec 2013
Hi steveo3002,

I am currently looking into the same problem ...

Did you manage to get any further?

Your pictures were quite helpful and
I think you were "almost there" ...

Currently I am at the stage where I have
dismantled the LCD display and removed the
backlight.

I managed to do so without removing the
display piggyback from the control pcb unit.

The backlight itself seems to be illuminated
by 4 white LEDs.

Strangely this 4 LEDs seem to be connected in parallel,
which is an absolute "no-go" circuitry-wise, even if they
are current driven!?

No wonder that they died one by one ...

Currently, I am trying to figure out what the best way to
replace them would be (adding a series resistor to each one
of them!?)!

Kind regards
-grzl-
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Old 17th January 2014, 07:54 PM   #4
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Join Date: Dec 2013
Ok, did it ...

Replaced the 4 LEDs of the backlight by
a quadruple of WTN-1206-450kw white 1206 SMD LEDs,
yesterday.

I put the LEDs on the very corner of the existing soldering pad
with one side, so that enough space was gained to drop in
a 10 Ohm series resistor (0805) between each LED and the other soldering pad to compensate for differences in forward voltage between the LEDs.

(Each LED should receive a current of approx. 30mA of a total current of 120mA @ full display brightness,
so 10 Ohms seemed like a good compromise in terms of voltage drop and power rating of the 0805 resistor)

Verified that the replacement actually worked by connecting the frontpanel pcb without the LCD display reattached
to the rest of the remaining hardware of the CD740.

One can see the LEDs dim if the adjacent LDR is covered ...

Put the plexiglass slab of the backlight and then the LCD display back on and reassembled the whole radio.

Good as new ...

Kind regards
-grzl-
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Old 21st June 2014, 03:10 AM   #5
mapson4 is offline mapson4  United States
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Glad it worked for you. Please post pictures of the fix in place would be helpful. I have the same problem.
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Old 1st July 2014, 02:28 AM   #6
mapson4 is offline mapson4  United States
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Default Working on same CD 740 dim display

Hello, I have the same issue. I have the display/control board out of the unit and have unsoldered the pins which connect the display board to the control board. I will be adding picture to this thread to document this detail of the repair. Many thanks to grz1666 for breaking the trail which I am following.
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File Type: jpg 100_3502.jpg (242.1 KB, 4 views)
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Old 3rd July 2014, 12:49 AM   #7
mapson4 is offline mapson4  United States
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Default Frame LCD removed

In this post I have removed the black aluminum frame and LCD by bending the tabs under the piggyback PCB. You do not need to remove the piggyback PCD to do this, although it makes removal of the tabs easier, at the risk of damaging the PCB with de-soldering.
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File Type: jpg Holden-20140702-00755.jpg (478.5 KB, 3 views)
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Old 3rd July 2014, 02:20 AM   #8
mapson4 is offline mapson4  United States
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I have now removed the plexiglass cover from the base by using a sharp tool to seperate the plexiglass from the white sticky film underneath. The sides are easy, the ends are tricky because the small vertical PCB's are stuck to the plexiglass also. Take your time or wyou will have more to fix.
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File Type: jpg Holden-20140702-00756.jpg (327.0 KB, 2 views)
File Type: jpg Holden-20140702-00759.jpg (501.9 KB, 3 views)
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