Sony XBR-55X900H Service Manual page 58

2021/04/27 23:25:57 (GMT+09:00)
T R O U B L E S H O O T I N G
4.4 No Picture Tuner
FOR 12V LNB Voltage Checking: @ AEP and JP
+12V_LNB Voltage Checking
OK OK
OK
Check LNB power line Check P_ON_HL signal line MOSFET
Mount check F3200
+12.7V_MAIN at R643 = 12V? at base of Q604 = 3.3V? Q604/Q605 broken
NG
NG
NG
Repair
Please confirm Power
Please refer Power
Sequence u-com
supply troubleshooting
58
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE
SYS SET