Emerson LF501EM5F shuts down right after turning on.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

So I would need to open it up and see if some of the LEDs don't light up.
But I get the same readings when the led connector is disconnected from the psu.
How can it be an open led string?

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

I updated post 40.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Updated my post also.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

So I would need to open it up and see if some of the LEDs don't light up.
But I get the same readings when the led connector is disconnected from the psu.
How can it be an open led string?

You have Voltage feeding on string one to the ANODE then the Yellow Cathode return wire is then connected to the MOSFET and the current sensing resistor to GND, since the string is not open because you see 9V on the Cathode.
Same setup for the Blue (Anode) and Grey (Cathode), Black and White: but you see <1V on the return so the circuit has open circuit (high resistance) on those strings.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

With grey and white disconnected no back lights at all.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

Not even a flash for seconds?
Remove the Yellow, and put grey back in and see, if still nothing remove the grey and put the white one back in and see. Need to know which one lights up the screen at least one of them will come on for seconds.
I will need to trace the pins on the connector again.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Yellow out, white in, bottom half is lighter than top.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

Yellow out, white in, bottom half is lighter than top.

So just the White one in place you do see the backlights come on for seconds?

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Yes with the yellow out also.
I out the grey back in just now too and the screen it lighter than it was white yellow and grey out.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

Red 60vdc, yellow got as high as 9vdc, blue got to 80vdc, grey drops below 0.86vdc when turned on, black 80vdc and white 0.8.1vdc

BTW, is that 8.1V or 0.81V?

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

0.81 just checked it again now it's 0.83.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

That does not make sense for the Vdrops on the return to be that low, but the bottom line is that we know the other two strings are not lighting up.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Can I purchase/ replace those string?

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

I do not know what kind of LED strings set up are being used in side the panel.
Can you find the make and model number sticker on the LCD panel?

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

P/n:u3au3xh

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

I found this http://www.ebay.com/itm/50W12S1P-LEF...gAAOSwFGNWTTJr

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

Oh, one of those LG Innotek LED which commonly failed.
Expensive.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

I don't know. The listing says he has 3 of them. Should I ask? What would I need. 2 left and 2 right?

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

http://www.ebay.com/itm/EMERSON-LF50...QAAOSwe7BWx2cl

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

I need all those or just some?
So if I'm understanding this right, there are 3 rows of LEDs.
And you believe 2 are out.