1723 Furuno After 20 or so minutes, it appears that my screen has moisture behind it. Any ideas? Can it be fixed?

New Installation? Check out the fix in the link.

https://www.google.com/search?q=Furuno+screen+upside+down

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Your antenna seems to be mis alighned. Its ZERO point must be readjusted.

Bad capacitors.

The radar array inside is probably not spinning or the belt has slipped off.

Couple of things, are your filters clean??? If not clean them It also sounds like a lack of refrigerant, so get the system professionally checked and re-gassed.
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You need to determine if it's moisture or damage to the protective coating on the LCD glass. If the screen coating is damaged it will have patches or discoloration that resemble water spots like you see on windows and glasses exposed to hard water. If it's moisture between the glass and LCD you should be able to make out the tiny water droplets that are evenly spread throughout the screen. The only proper fix for a glass with damage to the protective coating is replacement of the bezel assembly. If it's moisture you can try inserting a few silica gel packs inside the unit. Don't try to disassemble the bezel (LCD/Screen) assembly. Just but the gel packs inside the 1650 chassis and give it a day or two. Otherwise, you're looking at factory repaire.

It may be the flyback transformer that sends HV (12,000 Volts) to your screen. That could be due to age, cold solder joints. Get it checked out by a technician. There may be more going on than I suspect. If it happens when you jar the unit (hit it) then more than likely the flyback transformer is the problem.

I don't beleive this is goning to fix your problem. Open the dome and visually check that it is spinning. There is a maintenance menu though. To open the maintenance menu;
1. Turn the radar on.
2. Wait until the initial screen appears, then press and hold UP and DOWN keys together.
3. In about 10 seconds, the maintenance menu as shown below will appear.
4. Press MENU key to close the menu.

go into installation mode (hold menu during power on) find radar setup, go to next page, do heading alignment. also tune video, your unit was reset!

You?ll need to setup Port Forwarding to set up a PPtP tunnel behind a Linksys router. Please follow these instructions to setup the router to forwarding incoming PPtP traffic to your PPtP server: Getting Started 1. You must set a static IP address on the server. If you're unsure of how to do this please go to our Answer ID 534 for information on setting a static IP address in Windows. 2. Once the static IP address has been assigned please go to your desktop and double click on Internet Explorer (Located on the Start Menu in Windows XP) 3. Once "Internet Explorer" opens, please type http://192.168.1.1into the "Address Bar" and click GO 4. The "Enter Network Password" window will appear. Skip user name and type admin (admin is the default password) as the password, and click OK. 5. This will bring up the routers "Setup" section. Look under "Domain Name" and check what version of the firmware you're using. 6. You will need to click on the Advanced tab to the very right. Once the "Advanced" tab comes up please go to the Forwarding tab. Firmware prior to 1.32 This will not work with firmware prior to 1.32 Firmware between 1.32 and 1.36 Service Port Range 47 ~ 47 1723 ~ 1723 IP Address 192.168.1.3 192.168.1.3 Firmware after 1.36 up to 1.40m Service Port Range 47 ~ 47 1723 ~ 1723 Protocol Both Both IP Address 192.168.1.3 192.168.1.3 Firmware after 1.40m Customized Application VPN VPN Service Port Range 47 ~ 47 1723 ~ 1723 Protocol Both Both IP Address 192.168.1.3 192.168.1.3 Finishing up Click Apply, then Continue. Restart your computer