Sceptre X405BV -- Backlight on in standby?

[DoorOfTime]

I have a sceptre x405bv TV with bad LED strips. The screen displays dimly over the good LED's, and on disassembling it looks like over half of them are dead tested by multimeter diode test on test points. Plugging it in with the panel disconnected (this TV has a combined power and main board), the backlights immediately receive power when the set is plugged in. When the power button is pressed, it flashes brightly then dims, but additional LED's turn or flicker. When it's turned off again some back lights stay on.

Before I order replacement strips I wanted to ask if it is typical for LED's to have power as soon as the unit is plugged in/in standby (with the panel disconnected) or if it's possible the board is defective and constantly supplying backlight power which is why so many LED's burned out?

I can't see through to the LED's through any part of the chassis on this model to confirm backlight behavior when everything was connected, and I'm a bit cagey about trying to re-connect the panel without fully re-installing it for fear of damaging cables.

Full model number: X405BV-FMQC8CRAV93CG

In the attachments you can vaguely see the difference in intensity in standby versus powered on (sorry about rotation... it doesn't want to upload with saved rotation)

[dskall]

Re: Sceptre X405BV -- Backlight on in standby?

Some tv's turn on backlights with t-con disconnected.

[Diah]

Re: Sceptre X405BV -- Backlight on in standby?

In the attachments you can vaguely see the difference in intensity in standby versus powered on (sorry about rotation... it doesn't want to upload with saved rotation)

this is in normal LED behavior.. you have leak at PCB or Opto defect. disconnect the MB from PCB and plug in wall did they come on again??