Sony HT-ST9, Руководство по обслуживанию

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HT-ST9
55
4. Power is not turned on (OLED display does not appear)
Power is not turned on.
(OLED display does not appear)
The voltage of the following is 28 V.
POWER board: CN904 pin 3 to 5
The voltage of the following is
12 to 18 V.
POWER board: CN904 pin 9
The voltage of the following is 3.3 V.
MB1406 board: IC3004 pin 1, 46
The voltage of the following is 3.3 V.
MB1406 board: IC3004 pin 11
(PCONT_FL (O-LED))
Yes
Yes
Yes
Vibrator (X3001) on the MB1406
board is oscillated after AC input.
Yes
Fuse (F901) on the POWER board
conduct the electricity.
No
No
No
Check the IC3004 or state of
vibrator (X3001) on the MB1406
board, and replace the MB1406
board.
The reset signal is inputted to pin
49 of IC3004 on the MB1406 board
after AC input. Check the IC3005 and surrounding
circuit on the MB1406 board, and
replace the MB1406 board.
Check the state of IC3004 on the
MB1406 board, and replace the
MB1406 board.
No
Check and repair the DISPLAY
board.
No
Replace the fuse (F901) on the
POWER board.
Fusible resistor (R914) on the
POWER board conduct the
electricity.
Yes
Replace the POWER board.
No
Replace the fusible resistor (R914),
IC930 on the POWER board.
Check the IC303 and surrounding
circuit on the MB1406 board, and
replace the MB1406 board.
Check the IC304 and surrounding
circuit on the MB1406 board, and
replace the MB1406 board.
Yes
Yes
Yes
Yes
No
No
The voltage of the following is 12 V.
MB1406 board: IC303 pin 1