MHC-V83D
31
Sony CONFIDENTIAL
For Authorized Servicer
After AC in, while the set still in demo mode,
measure DC voltage of pin 1 & pin 9 of CN2007 connector.
DC voltage = (58.5V +/- 3.0V).
“PROTECT3” message is displayed on the
display panel after power on.
Yes
Yes
No
No
No
SMPS mounted pc board is broken.
Exchange SMPS mounted pc board.
END
Yes
IC2002 is broken and cannot be replaced.
Exchange Motherboard mounted pc board.
IC3503 is broken and cannot be replaced.
Exchange Motherboard mounted pc board.
Remove Mid SPK jack, check impedance of
pin 1, 2, 3 & 4 of CN2005 connector.
By refering to GND, the impedance value is measured.
Impedance > 100 kilohms?
Remove SW SPK jack, check impedance of
pin 1 & 2 of CN3502 connector.
By refering to GND, the impedance value is measured.
Impedance > 100 kilohms?
MOTHERBOARD Mount
Ampli
fi
er Diagnosis Flow (1/2)
1. “PROTECT3” is displayed after turning the power on
SYS SET
2020/06/22 22:32:42 (GMT+09:00)