Sony SA-CT800 - HDMI Output Problems

HT-CT800
41
2. The video and audio of HDMI is not outputted
The video and audio of HDMI is not
outputted.
The voltage of the following is 5.0 V.
MB-1612 board: JL317
The voltage of the following is 3.3 V.
MB-1612 board: JL327
The voltage of the following is 1.1 V.
MB-1612 board: JL335
The voltage of the following is about 3.3 V.
MB-1612 board: IC301 pin 5
MB-1612 board: IC303 pin 5
MB-1612 board: Q303 base
Check the mounted state of the area
surrounding IC301, IC303 and
transistor (Q303) on the MB-1612 board.
The voltage of the following is 3.3 V.
MB-1612 board: IC3000 pin 167 (NRESET)
The pin 170 (SYSCLK/XI) of IC3000 on the
MB-1612 board is oscillated.
Yes
Yes
One voltage of the following is about 5.0 V.
MB-1612 board: CN3001
pin 19 (HOT PLUG DET)
MB-1612 board: CN3002
pin 19 (HOT PLUG DET)
MB-1612 board: CN3010
pin 19 (HOT PLUG DET)
Yes
The voltage of the following is about 5.0 V.
MB-1612 board: CN3004
pin 18 (+5V POWER)
The voltage of the following is about 6.0 to
13.0 V.
MB-1612 board: IC3008 pin 5
Yes
The voltage of the following is about 5.0 V.
MB-1612 board: CN3001, CN3002,
CN3004, CN3010
pin 15 (SCL (5V)), pin 16 (SDA (5V))
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Yes
No
No
No
No No
Check the HOT PLUG DET line.
The voltage of the following is about 5.0 V.
MB-1612 board: R3223, R3226, R3229,
R3230
The voltage of the following is about 3.3 V.
MB-1612 board: Q3001 base, Q3002 base,
Q3003 base
Yes
Check the area surrounding NRESET line
on the MB-1612 board.
The voltage of the following is about 3.3 V.
MB-1612 board: IC3011 pin 5
Check the pin 2 and pin 4 of IC3011 on
the MB-1612 board is oscillated 27 MHz.
If not oscillated, check the mounted state
of IC3011 on the MB-1612 board, and
check the pin 7 of IC401 on the MB-1612
board.
abnormality
Replace the MB-1612 board.
abnormality
No
Check the SCL, SDA line (mounted state
of connector (CN3001, CN3002, CN3004,
CN3010) and resistor (R3012, R3013,
R3016, R3018, R3034, R3035, R3104))
on the MB-1612 board.
Check the UNSW12V line
(mounted state of diode
(D3001, D3002) on the
MB-1612 board.
abnormality
Yes
The voltage of the following is about 3.3 V.
MB-1612 board: IC3008 pin 1
Check the mounted state of the area
surrounding IC3008 on the MB-1612 board.
abnormality
Replace the MB-1612 board.
abnormality
Replace the MB-1612 board.
Replace the MB-1612 board.
abnormality
Replace the MB-1612 board.
Replace the MB-1612 board.
SYSSET
2019/09/2422:06:08(GMT+09:00)