Will not power on correctly, black screen
SAMSUNG QN75Q60RAFXZA
Black screen, hearing a click noise about every 15 seconds, power light is on. Not responding to remote. Will not turn off (click noise about every 15 seconds from P/S) have to unplug to power off.
Other symptoms: Sometimes when you turn off TV it would come back on after 30 seconds. Before the TV went black, things started to act weird. Had to go in and clear memory and running apps. Then started to get a malicious process pop up notifications.
Took back cover off and used multimeter.
Power Supply BN44-00874E connector CNM802 to the Main Board BN94-14119C. Disconnected this cable, Have backlights now and the click noise stopped.
Checking the connector (CNM802) from P/S, Pins 3-9 had correct 13V, Pin 2 ANA Dim 3.35V, Pin 4 On/OFF 0V, Pin 6 PWM BLU 2.8V, Pin 8 PWR ON 4.56V. (Disconnected from main board)
Connected the cable back, clicking started and checked connector again. Pins 3-9 still 13V, Pin 2 now 0 to .24V, Pin 4 still 0V, Pin 6 now 0.04 to 0V, Pin 8 now 3.53V but changes to .11V when it clicks.
Leaning toward a bad main board, but have not checked the transistors or diodes on the P/S. Does anyone know what I should be reading for an ohms measurement on the transistors? The fuse on P/S was good.
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