I want to get 5500 navman shcematic diagram , . how it is possible ?

Contact the maker or Google for this item by model number.

Just got the same one and same problem, I also have a 5505i and is only zooms in close when i put in the c-map chip and it zooms close in the chip area only?? now i have a chip for the 5500i and it zoomed in but only on the Texas part of the map, that is the chip it came with, but i live in Canada. Be carefull the c-map max chip for the 5505i is not compatible with the 5500i it needs c-map nt+ chip. 5500 chip is black 5505 is orange

I HAVE THE SAME PROBLEM.U WILL FIND THE ANTENNA IS BUGGERED.THERE ARE NO SPARE PARTS AVAILABLE FOR THIS MODEL.LESSON; DON'T BUY NAVMAN OR NORTHSTAR.I HAVE ONE OF EACH. NEVER AGAIN!!!

Its water ingress causing a short in the high voltage wiring PCB.

Open the unit with a 1.5mm allen key, unscrew the power/data cable sockets with a spanner and GPS antenna inlet with an 8mm socket (NA to i models) .

Where water has arced there will be burning black on the green PCB evident, cut the PCB wire and remove the section around the burn.
solder a new wire to bypass the short.
Dry the unit and seal with silicone to prevent re occurrence.

Its a 2 hour repair requiring a high DIY soldering standard but off set it against the time it will take to reload you waypoints in a new plotter , its well worth the trouble.

DAKA

Yes the screen is replaceable, there are four screws holding it to the PCB and a short ribon and a two wire power lead.

Navman 5500 does not support C-MAP MAX maps.. only C-MAP NT+ maps.

Hi....
I have gone through your problem.Follow this link.

Hope you are searching for the same.

Have the same problem??

Used to take less than a minute to acquire satellites now takes 10-20minutes.

this is because of high voltage in input AC power so u have to replace it