Sony XBR-55X900H Service Manual page 67

2020/06/27 06:31:32 (GMT+09:00)
S E C T I O N 3
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
67
SECTION 1 SECTION 2 SECTION 3 SECTION 4 SECTION 5 SECTION 6
SYS SET