Hitachi IJ UX Service Manual page 284

6.5.9 Freeze of display
*) "Freeze of display" means that the touch screen does not operate
without any error message when the screen is touched.
Freeze of display
Turn off and on the power
switch.
Does the screen operate
normally?
Download the latest software
Does the screen operate
normally?
Disconnect and reconnect the
CN6 of EZJ128 board.
Does the screen operate
normally?
Disconnect and reconnect the
CN1 of EZJ126 board and
CN1 of EZJ128 board
Does the screen operate
normally?
Replace the touch panel
Does the screen operate
normally?
Replace EZJ128 board.
Does the screen operate
normally?
Replace EZJ126 board.
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
6-66
Resume the
operation