Sceptre X460BV-F120 2 seconds to power off.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

Hmm, OK, can you see what the ripple is like on DC side of 16V (i.e. at connector)

Maybe you have bad t-con board, though you said you did get a brief "Sceptre" logo? Also could be audio amplifier - perhaps shorted speaker - though I suspect 16V is for audio, not 12V.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

Try running board with 12V connected, but speakers removed.

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

Hmm, OK, can you see what the ripple is like on DC side of 16V (i.e. at connector)

Maybe you have bad t-con board, though you said you did get a brief "Sceptre" logo? Also could be audio amplifier - perhaps shorted speaker - though I suspect 16V is for audio, not 12V.

Yeah, the "Sceptre" logo looked fine when it came on. It does not come on with the 12V disconnected.

The ripple in the last video is with the coupling set to AC, should I set it to DC for the output? Does it matter?

Try running board with 12V connected, but speakers removed.

Speakers aren't connected right now. There are four speakers. Two in the main body, two in the cover. I had to disconnect all four to take the cover off. I'm pretty sure 16V is for audio.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

AC coupling for ripple output.

Also (after doing ripple test):
Try reconnecting 12V back to main board but unplug t-con.

See if same thing happens.

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

There is no ripple at the output, just a straight line. With the T-Con disconnected, the set stays on. Looks like it may be time to cancel the main board order too.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

Mkay, let's look at the t-con. Could have a fault, but the panel's not shorted as you got a picture (although have you seen all pixels work... try getting TV on snow then plug t-con in)

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

try getting TV on snow then plug t-con in

Not following you here. What's "snow"? The screen shows nothing with the T-CON disconnected.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

Analog snow... no signal, etc. Easy to verify whole panel works... Do it with t-con in as quick as possible.

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

It cuts off during the display of the logo. There is no time to change sources.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

How about if you unplug the t-con then plug it in while the set is running.

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

I'll try. There are two cables from the video board to the tcon. Will that screw things up?

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

No dice. Even with the speakers connected and the tcon disconnected I'm not getting any signal as to when I'm on the correct source. I've tried plugging one side in at a time but it shuts off before I can get the other side plugged in.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

I guess it provides dual LVDS, try and identify if one has 12V power on it, and if other has no power on it (hopefully.)

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

I've tried with each one plugged in at a time and it shuts off either way.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

I guess 12V is on both then, you could verify though by testing with a DMM.

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

Both LVDS cables supply 12V to the tcon.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

Well, that's annoying. Though, I note they go through another board before reaching the T-con. I suspect this is the motion scaler (120Hz feature.) If you just unplug the motion scaler LVDS, what happens?

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

With the video board LVDS disconnected the unit stays powered on. I connected a 12v bulb to pull a load in place of the tcon. It lit and remained lit. Looks like I'm in need of a tcon.

[tom66]

Re: Sceptre X460BV-F120 2 seconds to power off.

Which "T-con" are you talking about? The motion scaler, or the real panel T-con?

[johnboy1313]

Re: Sceptre X460BV-F120 2 seconds to power off.

The tcon that connects to the panel via laminated ribbon cables. What I would call your typical tcon board.