PRO-2004, PRO-2005, & PRO-2006 Backlight Replacement

 

About 15 years ago, the display on my PRO-2004 scanner grew dim.  It's not a bulb, but rather an electroluminescent (EL) panel located behind the LCD.  Radio Shack had stopped selling the replacement ELs for this model by then.  After searching the internet, I discovered Miller Engineering company.  They sold generic EL panels that could be trimmed to size, and could be fit in place of the existing panel. Bob Parnass gave me credit for the discovery in one of his reports.  My website address has changed since then.  I have also been out of the scanner hobby for almost as many years.  Only recently did I receive my Ham radio license, which rekindled my interest in the scanner hobby.

Miller Engineering still sells the same product as before, but I've found a less expensive, larger, and brighter replacement.  The source is located in Hong Kong, but I purchase these via Ebay.  With shipping, these are about $10 each.  To date, I've used these to fix the backlights in multiple PRO-2004/5/6 scanners.  The process is similar for each, but the PRO-2004 is a bit easier.

 

The camera has a hard time capturing the true color of the new EL.  It's somewhere between the green in the first pic, and the blue in the second.


In the PRO-2004, access to the LCD is rather easy.  Simply remove the case, and the two upper screws holding the front panel to the metal chassis.  Tip the front panel outward, and you'll have easy access to the back of the LCD board.  Remove the screws attaching it to the front panel.

The foam trim is rather brittle being almost 30 years old.  In the past, I would have simply lifted it off.  Mine was fairly well adhered, so I only lifted the end to access the the EL.

That beige goo is an adhesive that holds the EL in place.  The material above the EL is glass.  Care must be taken when slicing through the adhesive to release the EL.  I use an X-Acto blade.  I cut the two wires going to the EL.

The upper EL is one from a PRO-2006, but the process is the same for the other models.  The lower EL panel is the one from Ebay.  It's much larger, plenty big enough for any of these scanners.

The old EL was placed on top of the new material, and traced with a Sharpe.  Cut it slightly undersize with sharp scissors.  I found this new material tends to delaminate when cut.  I put a 2" wide piece of clear tape on the face of the EL, carefully working out all the bubbles.  Then turn it over, and fold the excess material onto the back of the EL.  It is then put into a heat type laminator, completely resealing the EL.

Old EL vs. the new one.  The illuminating side of the new EL is a light green, the back, a darker green, is shown here.

The new EL is slid into the groove under the LCD.  Sometimes it will get stuck on the foam block under the middle of the LCD, or the guide block at the far end.  I use a plastic stick under the LCD to lift the EL into position, as it's being pushed along.

A couple of new wires were soldered in place of the old, short ones.  Despite the old ones being color coded, this is an AC devices.  It's not polarity sensitive, so either wire can go to either lead on the EL.

Just prior to sliding heat shrink over the contacts.

I always cut the new EL material a little long.  The overhang is not an issue, and makes aligning the EL easy.  The area inside the black border will be visible when installed.  Make sure the EL covers these area.  The little battery powered circuit used to test the EL in this picture, is a product sold by Miller Engineering.  It's part of their Engineering Kit.  Handy for this demo, but not necessary.

 

 

 

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Last updated 06/21/14    All rights reserved.