MHC-V41D
40
2. MOTHER Board Mount Amplifi er Diagnosis Flow
2-1. “PROTECT3” is displayed on the vacuum fl uorescent display after turning the power on
2-2. The sound is not outputted
“PROTECT3” is not displayed on the
vacuum fluorescent display, when
removing the speaker (SP1 to SP5)
and turning the power on.
Check and replace the speaker
(SP1 to SP5).
No No
Replace the IC2002 on the MOTHER
board.
Yes
Yes
“PROTECT3” is displayed on the vacuum
fluorescent display after turning the
power on.
Yes
IC2002 pin 27, 28 (OUT_D), 32 (OUT_C),
35 (OUT_B) and 39, 40 (OUT_A) on the
MOTHER board is short to GND.
MOTHER board has been damaged.
Replace the MOTHER board.
The audio signal is inputted to IC2001 pin 24
(SDIN1) and 25 (SDIN2) on the MOTHER board.
MOTHER board has been damaged.
Replace the MOTHER board.
No
Replace the IC2001 on the MOTHER board.
No
Yes
The sound is not outputted.
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
Replace the IC2002 on the MOTHER board.
No
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.
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