Fan Error Troubleshooting - Sony KDL70XBR7 Training Manual

Fan Error Troubleshooting

If the unit is shutting down with a 9X error code it must be determined if
one of the fans is defective or if there is a fan drive problem. The flowchart
in Figure 5-2 will assist in this issue.
COOLING FAN
ERROR 9X
Both fans not
rotating ?
No
1 fan not
rotating ?
Both fans
rotating
Less than
0.6VDC at yellow
wire?
No
AU Board
CTV-53
Yes
AU Board
6VDC
Yes No
at red wire of Check Fan Conector .
inoperative fan If OK change AU board .
connector ?
Yes
Replace Fan
Yes
Replace Fan
FAN ERROR TROUBLESHOOTING FLOWCHART
FAN
NOTE: COOLING FANS
DRIVE
WILL NOT START
6VDC
ROTATING UNTIL 18
SECONDS AFTER
UNIT IS TURNED ON
FIGURE 5-2
Chapter 5 - Appendix
FAN
FAN
ERROR
GROUND
0.0VDC
18