Troubleshooting - Sony HT-CT800 Service Manual

HT-CT800
1. "PRTCT", "PUSH" and "POWER" is displayed on the front panel display after turning the power on
"PRTCT", "PUSH" and "POWER" is
alternately displayed on the front
panel display after turning the
power on.
Yes
IC6005 on the MB-1612 board is
burned out.
No
"PRTCT", "PUSH" and "POWER" is
alternately not displayed on the
front panel display, when removing
the speaker connection connector
(CN6002, CN6003) on the MB-1612
board and turning the power on.
No
The voltage of the following is 3.3 V.
MB-1612 board: IC5001 pin 96
No
The voltage of the following is 12 V.
MB-1612 board: IC6005 pin 2
No
Check the area surrounding IC6002
and transistor (Q6002) on the MB-
1612 board, and then replace the
MB-1612 board .
40
SECTION 4

TROUBLESHOOTING

Yes
Replace the IC6005 on the MB-1612
board.
Check and replace the speaker (SP1,
Yes
SP2), check and repair the connection
cable with speaker.
Yes
The voltage of the following is 3.3 V.
MB-1612 board: IC5001 pin 50
No
OUT_A (pin 39, 40), OUT_B (pin 35),
OUT_C (pin 32) and OUT_D (pin 27, 28)
lines of IC6005 on the MB-1612 board do
not short-circuits or opens.
If there is no abnormality, check the area
surrounding transistor (Q6004, Q6005)
on the MB-1612 board.
Mounted parts on the OUT_A (pin 39, 40),
Yes
OUT_B (pin 35), OUT_C (pin 32) and
OUT_D (pin 27, 28) lines of IC6005 on the
MB-1612 board short-circuits or opens.
No
The PWM signal is inputted INPUT_A
(pin 5), INPUT_B (pin 6), INPUT_C
(pin 14) and INPUT_D (pin 15) lines of
IC6005 on the MB-1612 board.
No
Check the area surrounding IC6004 on
the MB-1612 board, and then replace the
MB-1612 board .
Yes
Replace the MB-1612 board.
abnormality
Replace the MB-1612 board.
Yes
Repair the short-circuit and opening of
mounted parts.
Yes
Replace the IC6005 on the MB-1612
board.
SYS SET