Yamaha TF1, Service Manual

Page: 149 / 372

TF5/TF3/TF1
149
3) Gradation
4) White, 5) Red, 6) Green, 7) Blue, 8) Black fill each
color
Push the [
TOUCH AND TURN
] knob, when the check is
completed.
Then the popup dialog as follows will be displayed on the
screen.
Select the
[FAIL]
or
[PASS]
. And pushed the
[TOUCH
AND TURN]
knob, a judgment will be decided and it will
end.
<GUI>
LCD Diag Result
FAIL PASS
7-8-2. BACKLIGHT
[Contents]
Inspect the backlight circuit of LCD.
[Procedure]
<GUI>
LCD Backlight Diag Result
FAIL PASS
Popup dialog as shown in the above fi gure is displayed on the
screen. Judge whether the brightness of the backlight of the
LCD is changing and select
[PASS]
or
[FAIL]
.
7-8-3. TOUCH
[Contents]
Inspect the touch sense circuit of the LCD.
[Procedure]
<GUI>
Since a screen as shown in the above fi gure is displayed,
touch operation of three points is performed to LCD
(touchscreen), and the locus on a screen is checked. A locus
is eliminable if
[CLEAR]
at the lower left of a screen is
touched.
The locus of the three on a screen, check being drawn as
operation.
If a check is completed, a upper left
[FAIL]
or upper right
[PASS]
will be chosen and it will end.