A screen showing figure I can't understand.

It sounds like the guitar pickup may be faulty. It may be a loose connection on the which could be soldered easily or it may be damaged in some other way.

As this is isolated with your G string, I suspect the individual pickup unit is at fault.

If it truly a crack any repair needs to be done professionally. The board may be joined or glued from two pieces and the glue line MAY show. If the crack is very straight this may be the case. How is the sound? If it is normal then just watch it for any degradation.

You can try this.
STEP 1:
Set Program protect and Combi Protect to OFF.
- GLOBAL
- Using PAGE+ or PAGE-,
find untill the display show "3A-MEMORY PROTECT".
Set the parameter to OFF by using YES or NO button.
STEP 2:
Data Load.
- GLOBAL.
- Using PAGE+ or PAGE-,
find untill the display show "05A-PRESET DATA".
Change ALL to PRG (your case).
Use Left/Right Arrow button to moving cursor.
Choose "PRE-a" (your case).
Move cursor to "OK?".
Press YES when "OK" blinking for confirm.
Exit (Go to PROG button).

First Check Your Pendrive Or Make Formate in Computer Than after Use your work.

What I figured out - simple. Plug your usb cable all the way in. That's it. Did I guess it? ;)

Is the battery installed in correct polarity? If so- try rotate it in position to rub through potential corrosion.

Since it has a remote battery, it would not hurt to look at the installation to make sure no wires are broken. Especially the ground wire to the pickup.

It might also be a good idea to apply some contact cleaner to the output plug since it is in the power circuit. Cycle the plug in and out a few times to clean the contacts. Also some contact cleaner to the preamp controls would be useful.

Be aware some lubricants may contain silicone and that can interfere with wood finishes or repairs to the finish in the future.

Contact Your Product Dealer Or Store Manager And Use Your Warenty Card.

when i turn on my roland xa it's going on but it show on screen xa fantom and it gonig hang what i do

You can download a manual from the tascam site for this model. as long as you pre-named your songs, they should show in the menu without mastering. You cannot burn any songs without mastering your songs first, however. They will not appear in the create cd section for this very reason.
Record, master,burn.

i assume you mean that, only half of your LCD is functional.
if this is the case, it culd be one or more of many things.

the most likely, is that the screen is cracked. this may be an "internal fracture" and will not be visible (you wont see cracks).

another, however, more unlikely reason is that the ribbon cable is partly detached. if this is so, you could get inside the keyboard your self (which WILL void your warranty).
this is rather difficult, and there is a high risk of damaging other aspects of the keyboard in the proses.

if it is still under warrenty, call up yamaha tech support and see if they are able to do anything for you.
if you are no longer under warranty, or would rather pay: find a local music (or electronics) store, and have them look at it.