Sony XBR-55X900C Service Manual page 150

3-5-8. FOR 12V LNB Voltage Checking: @ AEP_W and JP_SKP
12V LNB Voltage Checking
Check fuse F6000
NG
Change the fuse
XBR-55/65X900C, 905C, 907C
OK
Check Tuner power line
12V at JL9012 = 12V?
NG
Check harness between
B-Board and G-board
OK
Please refer G-board
troubleshooting
OK
Check P_ON_LNB signal line
at R9167 = 3.3V?
NG
Please refer DDCON
troubleshooting
NG
Harness broken
TROUBLE SHOOTING
OK
MOSFET Q9019
broken
150