32
UP 300 Service Manual
Failure 27
: The display does not work/works abnormally (no
response when tapping an icon on the touch screen)
Failure
Cause
Solution
Remark
⚫
Including two states:
Whether the display
can be powered on or
not (whether the
touch screen has
content)
⚫
The display can’t be
powered on, i.e. it
can’t work at all
⚫
If the display works
abnormally, i.e. it can
be powered on, but
the function is
abnormal
➢
Display has
failure
Turn off the power, remove the display, and
check if it has obvious surface crush, scratches,
etc.
➢
Screen signal
cable, power
cable plug loose
/ damaged
Turn off the power, check whether the signal
cable and power cable are damaged, whether
the connector is broken or the plug is loose. If
yes, replace the signal cable, power cable / re-
plug
Remove and
replace screen
signal cable,
power cable
➢
Mainboard
display socket
/mainboard
damaged
Turn off the power and replace the mainboard
display socket
Turn off the power and replace the mainboard
➢
Peripheral
interface board
damaged
Turn off the power and replace the peripheral
interface board
