Samsung UN55KU6300F no standby voltage

[x_orange90_x]

I have no standby indicator light and no light on the optical port. I checked the standby voltage on the two mosfets in the top left and they both read 30mV. I checked the fuse and it has continuity. I also checked the voltage on the two large 450v caps they both read 153v. All of these voltages are the same with and without the main board connected as well as with backlights connected/disconnected.

Nothing looks obvious like a burned ceramic disc cap or bulged electrolytic. No burned resistors, diodes, or anything like that.

[nomoresonys]

Assuming you already unhooked mainboard from powerboard and checked for backlight, check those 4 diodes there on top and the usual easy things to check first, all diodes, resistors on top of board is a good start. And check transistors for shorts between each pin. Finding no problems with any of that, maybe check the caps near the standby transformer.

[x_orange90_x]

Assuming you already unhooked mainboard from powerboard and checked for backlight, check those 4 diodes there on top and the usual easy things to check first, all diodes, resistors on top of board is a good start. And check transistors for shorts between each pin. Finding no problems with any of that, maybe check the caps near the standby transformer.

Correct, I did plug it in with main unhooked.. No backlight. I will need to remove a leg from each diode to check them, correct?

[nomoresonys]

I usually check them in circuit, if they read a little strange then lift a leg.