XR-85X93L Sony Mini LED No Power

[EazyBone]

Been a while since I posted but I got this TV for free luckily only about a year old. I plan on gifting it to my dad.

Plug in the TV no power no indicator late nothing.
I checked the 12 volts on the power supply with nothing plugged in and it doesn't give any voltage. Check standby voltage 3.3 volts. Check PS on 0 volts. i jump PS on and standby voltage and still no 12 volts. The main caps give 178 volts. Looks like they are working.

Appears something is wrong on the 12 volt line. Both fuses on the board are good. I'm trying to follow the 12 volt line down if that's actually the problem but I can't figure anything out. I'd prefer to repair the board if possible because the actual board is roughly 200 bucks. If anyone has any suggestions please let me know I'll be gone for 3 days but I figured I would post it now. Thanks again

[Diah]

it sound power _ON circuit., start with optocoupler PH022 , test it out side the circuit... you can also take out PH024 the one belong to BL_ON and use it to Power_ON.

but you have 3.3V STBY... so why the front Indicator out !!!

[EazyBone]

Will do! Also no idea about the indicator.. sometimes with Sony that I've got when you plug in there is no indicator on/present but sometimes there is. All I can think of, I'll check the voltages on this when I get back

How do I test a octocouplers? Do I use ground from main cap to test each leg on hot side? (Does this mean anything?) And then take it out and test it in diode mode or something? Never actually tested a octocouplers B4.

[Diah]

if you have STB 3.3V al east should be back just for short time power on from MN.
rread yours octocouplers label and search after its FUNCTIONAL BLOCK DIAGRAM to understand how to test out side the boards...

[EazyBone]

Okay will do, happy holidays diah, currently gone for Christmas time.