Buttons And Leds On The Front Panel Cannot Be Controlled Normally - Sony UP-D898DC Service Manual

2-2-2. Buttons and LEDs on the front panel cannot be controlled normally

Buttons and LEDs on the front panel
cannot be controlled normally.
Is the connection of FFC between
CN1002 on the MA-201 board and
CN501 on the KY-763 board
normal?
When the ON/STANDBY switch
is turned on, does the LCD
backlight on the front panel light up
and does the ON/STANDBY switch
light up in orange and then change
to green?
When the menu lever and buttons
on the front panel are operated,
is there any response (LCD display,
reception sound, rejection sound
and DOOR open/close)?
When the BRIGHT knob and
CONTRAST knob on the front
panel are operated, does the LCD
display change?
2-4 (E)
Yes
Yes
Yes
No
Replace the MA-201 board.
(Refer to Section 3-8.)
FFC: Flexible flat cable
Connect FFC correctly. If the
No
symptom persists, replace FFC.
(Refer to Section 5.)
No
Replace the KY-763 board.
(Refer to Section 3-5.)
No
Replace the KY-763 board.
(Refer to Section 3-5.)
Yes
Replace the KY-763 board.
(Refer to Section 3-5.)
UP-D898DC