Sony MHC-V41D Service Manual page 40

MHC-V41D
2. MOTHER Board Mount Amplifi er Diagnosis Flow
2-1. "PROTECT3" is displayed on the vacuum fl uorescent display after turning the power on
"PROTECT3" is displayed on the vacuum
fluorescent display after turning the
power on.
Yes
"PROTECT3" is not displayed on the
vacuum fluorescent display, when
removing the speaker (SP1 to SP5)
and turning the power on.
Yes
Check and replace the speaker
(SP1 to SP5).
2-2. The sound is not outputted
The sound is not outputted.
Yes
The audio signal is inputted to IC2001 pin 24
(SDIN1) and 25 (SDIN2) on the MOTHER board.
Yes
The PWM signal is outputted from IC2001
pin 39 (PWM_P_1), 41 (PWM_P_2),
48 (PWM_M_ 4), 49 (PWM_P_ 4).
Yes
The audio signal is outputted from IC2002
pin 32 (for L-ch speaker), pin 27, 28 (for R-ch
speaker) and pin 35, 39, 40 (for subwoofer) on
the MOTHER board.
Yes
MOTHER board has been damaged.
Replace the MOTHER board.
40
IC2002 pin 27, 28 (OUT_D), 32 (OUT_C),
No
35 (OUT_B) and 39, 40 (OUT_A) on the
MOTHER board is short to GND.
Yes
Replace the IC2002 on the MOTHER
board.
No
MOTHER board has been damaged.
Replace the MOTHER board.
No
Replace the IC2001 on the MOTHER board.
No
Replace the IC2002 on the MOTHER board.
No
MOTHER board has been damaged.
Replace the MOTHER board.