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  #1  
Old 08-12-2012, 01:42 PM
mfshook62 mfshook62 is offline
 
Join Date: Sep 2008
Location: Windsor, Ca
Posts: 101
Default Garmin GNS 430 Memory Battery Replacement

About a month ago a "Memory Battery Low" message was displayed on my Garmin 430. I read a few posts online about replacing the battery at home rather than sending the unit to Garmin along with hundreds or possibly thousands of $. I worked in the electronics industry and have a lot of experience replacing circuit board components, and would not recommend this battery replacement to anyone not trained in ESD precautions and the proper use of a soldering iron, solder sucker, and solder wick. It will be a very expensive mistake if you damage the circuit board. The battery location on the GNS 530 circuit board looks identical to the 430.

If you are up to the task and have the proper equipment, then there are really no surprises. First of all you will need a CR 14250SE-FT, a 3 volt lithium memory battery with 3 solder pins. They presently sell online for $13.75 including shipping. The battery will deliver 3+ volts until it reaches a minimum voltage of about 2.50v and then it triggers the "Memory Battery Low" message. The new battery voltage measured 3.20v and the removed battery measured 2.53v. The data sheet mentions that a low internal resistance gives the battery a shelf life of about 10 years and a work life of about 5-7 years.

As with any circuit board, take all ESD precautions. Remove top cover and the bottom case screws, the bottom case has one hinge and folds open. The battery is now visible on the lower left corner of the main circuit board in the photo. There are 2 Intel 386ex CPU's embedded on the board which provide the necessary computing power. Remove the screws that hold the front panel in place. Remove all the electrical connectors and all the circuit board screws, including the power transistor screws attached to the main board. Remove the microcircuit package and circuit board attached to the top of the main board. Be careful, most of the electrical connectors are loaded with very delicate pins. Remove 2 rear connector screws. Remove the main board by lifting up away from the case, and leave the insulator sheet in place. Now you have the main board in hand and are able to de-solder the battery. Use a solder sucker and solder wick to remove the solder from the three battery pins, and remove the adhesive that holds the battery in place. Replace the battery and solder the new battery leads in place. This is a multilayer circuit board and you have to be sure the solder remains liquid long enough so it wets all the layers and forms a good fillet on both sides. Use a dab of RTV to prevent the solder leads from fracturing due to vibration fatigue. Let it sit for a day for the RTV to cure, this will give you some time to take a few photos and admire your handy work.

Now follow the sequence back and be sure to give the proper respect to all the fragile connector pins. Use a thread locker on all the screws. Mount the 430 back into the panel and turn it on. It takes about 5 minutes to acquire enough satellites to load the current almanac and orbital data required to display your current GPS location. All memory data in RAM including waypoints and flight plans was lost. Also, before you start, make a copy of your configuration settings in case they ever need to be reset.

https://www.dropbox.com/s/yspnon61k4...nwaas.jpg?dl=0
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Last edited by mfshook62 : 08-16-2017 at 05:59 PM. Reason: moved photo to Dropbox
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  #2  
Old 11-27-2012, 12:43 PM
Tom Williams Tom Williams is offline
 
Join Date: Dec 2011
Location: Yukon, Ok
Posts: 2
Default Garmin 430 replacement Battery

I am looking for a source for the Garmin 430 memory battery which is apparently a CR1425SE. Does anyone know where I can get one?

Tom
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  #3  
Old 11-27-2012, 01:07 PM
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Sparky Sparky is offline
 
Join Date: Nov 2006
Location: Newnan, GA and Perham, MN
Posts: 349
Default

Here's one source...

http://store.batteryspecialists.com/cr14250seft.html
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  #4  
Old 12-09-2015, 05:15 AM
cohron cohron is offline
 
Join Date: Dec 2015
Location: Spring, TX
Posts: 1
Default Display backlight failure

I followed the procedures pretty well and have successfully replaced the bad battery. However, after powering up, I get the message 'Display backlight failure'. The display itself is only readable with a flightlight shined on the screen.

Google search says I may not have seated a cable/connector properly but I have no idea which it could be. I have disassembled it again and reconfirmed seating of the connections I disconnected however I may be missing something obvious.

Good news is I no longer get the 'Memory battery low' error anymore.

Can someone point me in the right direction?
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  #5  
Old 12-09-2015, 02:59 PM
Flyingleap Flyingleap is offline
 
Join Date: Nov 2012
Location: Cincinnati,Ohio KHAO
Posts: 103
Default Display problem and battery replacement

John
The 430 main board does have fuzes on them. Didn't check to see if there
were any for the inverter board for the display. That is a 2500Volt display
near 5Volt and 3.5V technology. My notes did say something about the fan connector and its run under the ribbon conn. Don't know why.....
You must be grounded with straps to your arms to a solid ground(electrical) to work on the 430. I'm not kidding!!! As Mike said "All ESD must be applied" Also, a "floating" tip on your iron is mandatory(from my notes).

Garmin charges about $1000 bench charge for repair. And, if you send it in
and it's a Garmin 430(not "W") they charge $3600 to bring it to current standards. And, if you refuse these charges, they send it back with the serial number tag removed.

I do love the way a Garmin gets me there in hard IFR, have a 430 and a 530.
Would I buy another manufacturer....NO WAY.
John
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  #6  
Old 12-09-2015, 03:53 PM
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FORANE FORANE is offline
 
Join Date: Nov 2011
Location: East TN
Posts: 411
Default

I have replaced this battery a few times. A couple pointers...

Test the battery you buy before installing it. Some of these sit on a shelf for a while before being sold. One battery I bought had lower voltage than the one I was replacing.

Quote:
Originally Posted by cohron View Post
I followed the procedures pretty well and have successfully replaced the bad battery. However, after powering up, I get the message 'Display backlight failure'. The display itself is only readable with a flightlight shined on the screen.

Google search says I may not have seated a cable/connector properly but I have no idea which it could be. I have disassembled it again and reconfirmed seating of the connections I disconnected however I may be missing something obvious.

Good news is I no longer get the 'Memory battery low' error anymore.

Can someone point me in the right direction?
Sure can and welcome to the forum.

The battery has 3 posts on it. Those posts must be soldered to the board. Be aware that the board has a couple of layers and if the solder does not penetrate all layers, you will get an error as you are getting. Take it apart again, heat the pins and remove your new battery. Re-solder the new battery in place again making sure you have hot solder to penetrate the battery pin holes. The error should be resolved re-soldering the battery.
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Last edited by FORANE : 12-09-2015 at 03:56 PM.
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