Emerson LF501EM5F shuts down right after turning on.

[jackfishbay]

Re: Emerson LF501EM5F shuts down right after turning on.

I just cracked one of these open....same problem...took a while but once I got the white plastic cover that's over the leds I found one string unplugged....put it back together and it works...think I messed it up though. ..one line of pixels is blue ...

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Cracked the panel. Project done.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

You can use 5 1N4007 Diodes to simulate the Vf of the White LED.
https://www.badcaps.net/forum/showth...335#post612335

If you are interested in more tear down pictures of various electronics you can see my collections here:
http://s807.photobucket.com/user/bud...?sort=3&page=1

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Just out of curiosity, has anyone ever come a cross just one bad led?
Would it be possible to bypass one? Would you notice it on the display?

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

I know you've said that before. I trust you.
I just don't understand it. Lol.
I trust Einstein was right about his theories but I don't get them. Lol

By the way, thanks for your help.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

I know it's because I'm new at this and not very bright but if the led connector is disconnected from the psu how can any voltage be fed to the led strings?

Btw, I did buy the led set.

The Voltage (before boost and after the boost circuit kicks in) will be present on the feeding pins to the Anode side of the LED string with or without the connector in place.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

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.

I know it's because I'm new at this and not very bright but if the led connector is disconnected from the psu how can any voltage be fed to the led strings?

Btw, I did buy the led set.

[ReeceyBurger123]

Re: Emerson LF501EM5F shuts down right after turning on.

Yeah, normally only one needs to fail and boom the whole lot go.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

I guess if I take it apart and put it back together without breaking anything, I've accomplished it.
If I break the screen, I'd be no worse off than if I hadn't fixed it except I'd have spent the money on the LEDs.

Or I could test them as per your video, see how many need replaced. Maybe I can get away with buying one strip and stacking them.

[ReeceyBurger123]

Re: Emerson LF501EM5F shuts down right after turning on.

It is, thats why im doing video on it. My other method is to make the strip look as original as possible. Stacking is also very effective as you can thermal adhere the replacement Led to the old strip and also give the Led on it a large area of copper trace to cool and its also very easy to preform.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

The stacking seems easier for me than your method ReeceyBurger123, since I don't have a hot air station.
I could then replace all of them, keep the ones I take out and cut out and save the good ones for the next repair and use the stacking method with the ones I keep.

Btw is Reecey ok? Your name is soo long. Lol

[ReeceyBurger123]

Re: Emerson LF501EM5F shuts down right after turning on.

Haha lol finish one thing before doing another, that the rule I follow. If not my moms house ends up with Tv's everywhere and I get shouted at

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

My wife is going to kill me. I have the tc-p55gt30 and p55vt30 sitting open in our spare front room, an kg 50pc3d, a Samsung un40d6400 in a spare bedroom, now this one.
I need to stop. Is there something like AA for this?

[ReeceyBurger123]

Re: Emerson LF501EM5F shuts down right after turning on.

Why not fix it, why not take that leap and try ehy ? There will be a way to reduce the Bl in the menu I have had Tv's that I repaired the Led backlight almost have lasted longer than they originally did. Also Budm has a thread on how to do the stacking method, here is the link:

https://www.badcaps.net/forum/showthread.php?t=51251

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Stacking method? I don't have a hot air gun like you used.
I'd have to replace the whole set. Like budm said, what if these were used on full brightness for years, I put them in and it last a week?
Maybe I'm better off just selling the psu and main board.

[ReeceyBurger123]

Re: Emerson LF501EM5F shuts down right after turning on.

Its a task but gives you good experience. I have a 50" Toshiba to do tomorrow with bad Led in the panel will make a video but I will be using the stacking method rather than replacing the actual bad Led.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

Oh. I'm thinking that's too much work.

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

https://www.badcaps.net/forum/showthread.php?t=52656

[budm]

Re: Emerson LF501EM5F shuts down right after turning on.

You need to remove the LCD glass panel, the diffuser, etc. from the front of the LCD panel assembly.

[Malachi]

Re: Emerson LF501EM5F shuts down right after turning on.

I saw reecey's video on how to test them but I don't feel confident replacing just the bad ones.