Trouble shooting Chart
Fan can not rotate
Ihdmi input does not output
FAN can not rotate
Check the voltage
of FAN
Go
Check the F AN
power supply circuit
No
OK
Replace a new fan
HDMI input does
not output
Go
Check the D VD mode is
OK,HDMI output is ok
No
Replace the MA board
Yes
Replace U4 ADV7622
check connector is HDMI IN OUT
IN 1
，
AND SET HDMI INOUT IN 1
INPUT,
Correct connection
No
OK
OK
harman/kardon
BDS 270 + 570 Service Manual
Page 46 of 90
