The retaining screw of the battery compartment is defective.
It feels like the above retaining screw was driven too tightly and causes the nut to spin in the socket. It sounds like the ribbing in the nut has worn out the receiving socket. It is my son's GPS receiver which he used when he was deployed in Iraq. Where can this be repaired?
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Yes, I just got a new 3.5 model today and had the same problem. There is a black plastic attachment on the back of the device that covers up the screw to the battery compartment. You can slide it off the device by depressing a little tab at the top of this attachment between the two sliding tracks that mount the attachment to the device. Once you remove the attachment, you can access the battery door screw either with a screwdriver or by hand (using the semicircular wire mounted on the screw). Hope that solves it! -- Paul in Boston
When I've seen this is usually has been a battery issue or the power section of the main board.
The battery is either not holding a charge or not being charged. The batteries will go after so many charge cycles. They will also die on the charger if you run them all day (for a lot of days) and never use any battery. If the battery is the problem then you should have seen shorter and shorter run times on the battery as it got worse. If it is a actual defective battery they just go but you usually will feel a lot more heat in the unit as it will be constantly trying to charge it. That can stress or harm the charging circuit so you don;t want to let it go too long.
Because you can still run it on the usb or external power I don't think the regulation or other circuits are bad. Usually they act up and you have a stone dead unit or a very glitchy one. I was given one like that and dropped in a new 10 cent regulator and away it went (still going too). That one was caused by the power source killing the power regulation parts inside.
Having said all that, don't be paranoid, I think its just he battery. You can replace those for under $25. Just do a search for gps battery or repair parts and you should find a few hundred sources. Pick the one nearest you or the on that has the best price etc (not too cheap or you may get a iffy offshore battery) When you look at any of these websites look for instructional videos. I think there are just 4 screws on that unit and the battery unplugs. Plug in the new one and put the screws back and charge it up and you are good to go.
The internal antenna BNC connection (the little steel bayonet that the secures the antenna or extender cable) is a common failure on these units. The threaded retaining ring on the outside of the antenna BNC comes loose when installing/removing the antenna connection, and eventually the BNC rotates and the solder joint inside fails. This happened on mine recently, if you are handy fixing small mechanical parts and a good solderer it is pretty easy to fix. Remove the batteries, remove all six outer case screws (but not the one with the oval metal plate) and gently pull the housing apart. Check the solder connection of the coax wire to the BNC pin & shield. If it's broken and the BNC is loose in the GPS case, tighten the outer BNC retaining ring VERY tight, add a drop of thin super glue (Hot Stuff or Permabond CyA, etc) to keep the ring/BNC/case mated, then repair the coax solder connection. Replace all the screws and test it outside. If it's an aviation GPS you would of course have this done by an FAA licensed avionics specialist. Wink wink.
Just pry it open (gently) with a flat bladed screwdriver. It's glued together with silicone seal. To put mine back together, I scrapped thoroughly to get the old stuff off, crazyglued the corners, then later filled the gap with silicone sealer. Easy.
Well I got to the battery, but still haven't figured out how to get it out. To get to where I got to first pop the front silver suround off then remove the 4 retaining screws and the body will come off, next cut the foil around the speaker and take out the 2 screws, you can then see the battery. Where to from here? please!!
I had a similar problem but with the model that only has 1 button. I fought with it sticking a screwdriver in the button and it wasn't coming off. Then I used a pencil and pushed the button down even farther and the whole top including rim came of as it was designed. It looks like they went through several designs before finally putting the battery compartment out in the open
I experienced the same problem about acquiring satellite signal even when it's a clear sunny day. After 30 mintues, it was still searching!
The unit appeared to have "stuck" in this acquiring mode. The following worked for me:
1) open the GPS antenna
2) press the bottom left screen while holding the power button to turn the unit on
3) enter maintenace mode
4) select diagnostics
5) clear error report, do NOT clear any user data
6) restart unit the usual way
My GPS 350 was able to acquire satellite signal in less than 1 minute after the above steps were taken.