Sony UP-D898MD - Keys and Leds on the Front Panel Cannot be Controlled Normally

2-4 (E)
UP-D898MD/X898MD
2-2-2. Keys and LEDs on the front panel cannot be controlled normally
No
Yes
Keys and LEDs on the front panel
cannot be controlled normally.
No
Yes
Is the connection of FFC between
CN1103 on the MA-195 board and
CN101 on the KY-711 board
normal?
Connect FFC correctly. If the
symptom persists, replace FFC.
(Refer to Section 5.)
When the power switch is turned
on, do all LEDs (LCD backlight
and button lighting) on the front
panel light up?
Replace the KY-711 board.
(Refer to Section 3-2.)
FFC: Flexible flat cable
No
Yes
Yes
No
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)?
Replace the KY-711 board.
(Refer to Section 3-2.)
When the BRIGHT knob and
CONTRAST knob on the front
panel are operated, does the LCD
display change randomly?
Replace the KY-711 board.
(Refer to Section 3-2.)
Replace the MA-195 board.
(Refer to Section 3-1.)