Question about Motorola Mobility MD451 Cordless Phone

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Keypad On and Off buttons do not work on the keypad for the MD451/MD41. Alcohol used; shook the base (yes, that is what Moto C/S told me). They were no help. Suggestions??

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On 2 of the 4 handsets on my Uniden DECT 2080, the large middle button has stopped functioning properly. It's the button with caller ID, phone book, and arrow buttons. One stopped working about 2 months...

After having the same trouble with my DCX200 and not finding a solution online for the problem, I set out to find a solution of my own. The fix I describe below is probably more of a band-aid than permanent fix but it appears to be working great. The problem, I believe, is caused by the metallic compound that the manufacturer used on the push button contacts in this model of phones and more specifically with the large multi-function button. This compound appears to wear off quite easily with repeated use of the keypad. Along with this I think that the design of the multi-function button did not take into consideration the environment in which it would be used. Not everyone washes their hands and face before using a phone (does anyone?) and between grease, make-up and natural oils of the skin building up and eventually making their way down into the components, this may be a contributor to why these buttons are so susceptible to failure.

_889.jpg What you will need:
1) Small Phillips head screw driver.
2) Small flat head screw driver (not shown).
3) Goo-Gone, Isopropyl Alcohol or some other degreaser/cleaner.
4) Hole punch, preferably smaller than a "standard" hole punch. I found the one I used in my wife's craft supplies.
5) Cotton swabs.
6) Metallic or foil tape. Can be found at any home improvement or hardware store.

Step 1. Remove battery and two screws circled in red with your small Phillips head screw driver.
Step 2. Pry off the dark grey back of the phone case with your flat head screw driver. I found that starting at the base of the phone and working around the sides was easiest.
Step 3. Being mindful the the wires that attach to speaker take the dark grey back off of the phone. Next remove the screw circled in red below:
Removing this screw will allow you to remove the circuit board from the front face of the phone to expose the numeric keypad as shown below. There is a thin white plastic keypad component that will either remain affixed to the keypad or the circuit board when you remove the circuit board from the front face of the phone. Be sure not to damage that.
Take the white plastic sheet and affix it to the circuit board side (if not already on it), with the small black button contact points facing down onto the circuit board as shown below:
Now soak one side of your cotton swab in your Goo-Gone or Alcohol solution and clean both the four small black push button contacts of the large multi-function button on the back side of the keypad and also the contact points on the circuit board. Then take the dry side of the cotton swab and remove any excess cleaner on the button contacts and the contact points. This step is critical. This cleans the surfaces and makes the push button contacts on the back side of the keypad ready to receive the foil tape.

Pictured below is the cleaning of the push button contacts of the multi-function button on the back side of the keypad:
Also clean the contact points on the circuit board using the white plastic sheet as a guide to where to clean. Don't forget to use the dry side of the swab to remove any excess cleaner:
Now the part that requires of bit of dexterity. Using your hole punch punch out four pieces of the foil tape. If you do not have a hole punch or are using a "standard" sized hole punch, you will want to try and use a scissors to cut out a small piece of foil tape that will fit over the black push button contacts of the multi-function key on the back side of the keypad:
Harvest the small circles of foil tape that the hole punch punched out of the foil tape.
You can see a couple of them on my finger below:
Now using your finger nail, gently remove the foil tape backing on these small circles. Yes, this can be a bit tricky, but I found it to be easier than I expected. With the backing off of the foil tape, affix your small foil circle onto the push button contacts of the multi-function button on backside of the keypad as shown below. Do not affix these to the circuit board contacts:
Do this for all four contacts of the multi-function button on the keypad. The picture below shows the finished repair to the push button contacts. I also placed the white plastic film component onto the keypad side to underscore the fact that you place the foil onto the keypad and NOT the circuit board:
Now place the circuit board back onto the front side of the phone (silver side) and fasten down with the screw you took out in step 3 above.

Affix the dark grey back of the phone onto the front side. There is a small plastic tongue at the top of the dark grey back that fits into a groove on the top of the front silver side of the phone. Get that tongue into place first then the rest of the back will snap into place.

After the back has been snapped back onto the front of the phone, fasten it down with the two screws you took out in step 1 in the battery compartment.

Put the battery back in, wait for the phone to turn on and try the keypad out. Below, you can see that I am checking the caller ID side of the mult-function button:
This fix appears to work quite well. I don't know how long the repair will last but it would be easy enough to do again if needed.

Sep 14, 2010 | Uniden DCX200 Digital Phone

2 Answers



It seems the problem with display as well as to the charging unit. Display problem can be repaired only br replacing the display. And for your set, its not worth to get the display replaced. You can get the handset to your near service man to check whether the power charging unit works well.

Thank you

Sep 08, 2008 | Motorola Mobility MD451 Cordless Phone

1 Answer

Can't register Motorola handset.


There is a very little that we can proceed to here, as these phones are known for the problem that you are facing & most of the customers that I have myself seen ... finally get rid of them buying new ones,

Let’s try resolving it though;

1.) Open battery compartment, remove battery. Also remove belt clip on back of phone. You might have to pry it a little.
2.) Pop off the access panel on upper back of phone. This panel merely hides two screws.
3.) Unscrew all visible screws, Separate front and back of phone. You might have to wiggle the pieces relative to each other. The rubber strips on the sides are held in place with dovetail grooves.
4.) The phone should come apart in three sections.
5.) At this point, get some cotton swabs and alcohol. Dip a swab in the alcohol and rub down the contacts on the keypad and little black pads underneath each button on the rubber membrane.
6.) Let it dry and re-assemble. Your phone should now work properly.

Please let us know if that was helpful enough.

Good Luck & Thanks,


Aug 21, 2009 | Motorola Mobility MD41 Expandable Handset...

1 Answer

Base problem

Something such as coffee or soda may have been spilled in the phone causing a loss of connectivity between the keypad and the contacts. The keypad is a rubber membrane with soft round nubs on the bottom that press against gold circuit board contacts when depressed. It would have to be disassembled and clean with q-tips and rubbing alcohol or similar solution. This is for a professional or handy person to perform only. You can get good deals on these phones on EBay for around 30.00 I have bought several phones this way with no problem.

May 28, 2008 | Panasonic KX-TG2740 Cordless Phone

1 Answer

Motorola MD400

Take battery out of handset for one minute.
Unplug base unit (power and phone line) for one minute.
Plug base unit back in (power and phone line).
Put battery back in handset. Place hangset on base for
one minute. This got my phone up and running.
I had no battery power in the base unit, but if I did, I think
you have to remove those as well.

Apr 17, 2008 | Motorola Mobility MD41 Expandable Handset...

2 Answers

Key pad on corless handset is not working

There is solution but it will only work if you are a handy person. The product is call ctrubber.jpgRubber Keypad Repair Kit and you can buy it here

Mar 31, 2008 | Motorola Mobility MD41 Cordless Expansion...

1 Answer

Handle Speaker phone stopped working

I'll assume this is on the base station portion. You can try unplugging the power while the phone is in the base, wait a minute, then plug back in. If that has no effect, I'm afraid you either have a failure in the keypad or in the electronics. To diagnose a keypad failure in the base, you'll need to disassemble the base. You'll find each of the rubbery keys momentarily connects two traces on the keypad circuit board when you press a button. You may also find the keypad fouled with dirt, liquid, etc, which could be a likely cause of failure. You can try manually shorting the two traces where the SP/Phone button would press and see if you are able to activate the speakerphone/dialtone. If that works, then carefully clean the keyboard circuit board and the rubbery keys. If that does not work, I conclude you have a bad keyboard circuit board or other electronics in the phone are bad.

Dec 16, 2007 | Panasonic KX TC1713 Cordless Phone

2 Answers

Motorola MD451 phone "Out of Range?"

Go To Menu, and Then Press Register, On The Base Than Place The Page Button On The Base.

Jun 06, 2007 | Motorola Mobility MD451 Cordless Phone

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