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The display on my HMS388 is not visible unit purchased 2006 seem to fade slowly, from about 2007 need display to know where your settings are

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  • mhaussegger Jul 26, 2009

    thanks for reply
    yes correct display is on page 4
    i can solder bits and peices

  • mhaussegger Jul 26, 2009

    oregon scientific HMS388 display is not visible i bought unit new 2006 display was ok for approx 2 years



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Mine faded away in two years, just out of the seller warranty! What a shame. I suspect they are investing in planned replacement. Sorry for bad news.

Posted on Jul 26, 2009

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Are you referring VDF Display on page 4 on the pdf file?

I want to make sure we are talking about the same item.


Before you start working on it,I need to know can you able to do soldering and changing small component in this unit.

This unit can have a bulb or a true back lite on system under the display unit.

The function of the back light is just like a projector bulb.


The first step is to confirm the display is still working.

Use a small flash light and shine it in an angle to look from the other side for an image of ANY DISPLAY.

Move the volume up and down and look for character change in fade image.

I hope you can see something (even faded) on the display.

Step two.

tap the surround area of the display to rule out intermittent connection problem.


If you are comfortable on opening up the unit then disconnect the open. Power it just a few second to discharge and capacitors.

Make use you open the unit slowly.

When you open the case look for any fragment(s) of electronic part(s).

This step can safe you a lot of troubleshooting time.

Check for a back lite bulb.

Check the voltage to the bulb (YOU WILL NEED TO power on the unit.....please be careful.)

Shine the flash light behind the display and look for bight display (segments)

IF all else fail.......apply light pressure on the display connect and check display on the front.

Please post question and result on the comment area. I will follow up it tomorrow.

Good luck

Posted on Jul 26, 2009

  • Vincent_G
    Vincent_G Jul 26, 2009


    Please go though my hit list and see what you found.

    The last step is to unplug the unit and fire up your soldering iron.

    You have to make sure your soldering iron is at full temperature.

    Give each connections on the display a hit.

    Check all connections inside and hope for the best.



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