Sony KD-55A8F - 4.4 NO PICTURE: @ TUNER

+12V_LNB Voltage Checking
Please confirm Power
Sequence u-com
NG
OK
OK
NG
Change the fuse
Check fuse F2801
Check LNB power line
+12V_MAIN at R495 = 12V?
Check P_ON_HL signal line
at CL414(R451) = 3.3V?
MOSFET
Q408/Q409
broken
OK
FOR 12V LNB Voltage Checking: @ AEP and JP
NG
Check harness between
B-Board and G-board
OK
NG
Harness broken
Please refer G-board
troubleshooting
Check +12V_Main at CN400
(JL401/JL411)
OK
NG
51
4.4 NO PICTURE: @ TUNER
SYSSET
2018/03/1622:32:44(GMT+09:00)