Sharp LC-52LE640U flashing logo.

[Malachi]

I just picked this tv up. Owner said he went to turn it on and wouldn't come one, just a flashing logo which I have verified. The flashing pattern is 1 slow one followed by 1 quick one.
He took it to repairman, who after taking it apart told him it needed a new psu for $130 plus labor.
He declined and bought a new tv.

I'd like to try my hand at fixing this psu at the component level before I try to just swap the board. So I need guidance from you masters.

Thank you.

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

According to the service manual that indicates lamp error.
I'm going to quit messing with these damn led tvs.

Could you guys still help to diagnose an led problem for sure?

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

I get 5v from pd-15 bu5v.
That's all. Nothing from the other pins on that connector.

[budwich]

Re: Sharp LC-52LE640U flashing logo.

you have to "fool" the power supply to come on but "strapping" the "PS_ON" signal coming from the main board to the ps. This usually done thru a resistor to the 5v supply.

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

I have some resistors. What do you mean strapping the PS_ON coming from the main board to the ps?
I'm afraid I need a lot of hand holding.

I looked at a YouTube video, I'm not getting any voltage on the ps_on as the video shows. The only voltage I get it 5v on bu5v.

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

Well I found a couple of threads on here that seemed to have had the same issue as me initially.
They were able to reset the error code a couple different ways.
One user said "input plus volume -", another said "ch+ and vol-", neither worked in my case.
One of the users said he jumped ps_on with BU5v but doesn't say what he jumped it with.
Should I just solder a wire between the two from the bottom of the board?

I'm starting to get the impression that I may be persona non grata on the this forum.
If that's the case, someone just tell me so and I'll stop wasting my time, yours an forum space.
Thanks.

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

Was able somehow to get it to turn on. When looking at it, the right side has a darker side then the left.
Would that indicated bad/shorted LEDs or something in the psu/inverter?

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

When I measure the red wire on the left side of the led connector I get 81.6v, the white wire is negligible.
The right red wire measures 127.4v and the white around 12v

[budwich]

Re: Sharp LC-52LE640U flashing logo.

are those voltages read with the connectors connected or left off. I would think that they should be the same and further, the board should have printed indications as to what they should be.

[ReeceyBurger123]

Re: Sharp LC-52LE640U flashing logo.

You have an Oc or shorted Led in the screen. You need to take it apart to test and replace them.

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

are those voltages read with the connectors connected or left off. I would think that they should be the same and further, the board should have printed indications as to what they should be.

It's with the connectors off.

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

You have an Oc or shorted Led in the screen. You need to take it apart to test and replace them.

I was afraid of that. I was going to try to switch the wires around in the connector to see if it caused the other side to get dark and the dark side to get brighter.

The last set I tried to replace the led for, a 50" Emerson, I cracked the screen when putting it back on.
This one is even bigger. I wonder if these are edge led or back lit LEDs?

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

Switching the wires didn't help. I guess it is the led.

[ReeceyBurger123]

Re: Sharp LC-52LE640U flashing logo.

Yep, easy fix IMO just be VERY careful of the screen !

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

Yes for you. After watching your video I thought so too. Now I'm sitting on a set of LEDs for a 50" Emerson that cost me $70.
Looking on YouTube, this set seems to have edge strip LEDs. I could not find the edge strips anywhere for the Samsung un40d6400 that had two shorted strips.

Not sure if I could get more of ou this set by selling it as is or once I break the screen and have to sell the individual boards.
It's a shame. The left side has a great picture in my opinion. Better than the 5 or 6 led Tvs I've fixed and sold.
I might have kept this one.

[ReeceyBurger123]

Re: Sharp LC-52LE640U flashing logo.

Only way to find out if you can find replacement Leds is take it apart. Deffo worth fixing

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

I took it apart and got the led strip out, can anyone help me identify the part number?

[budm]

Re: Sharp LC-52LE640U flashing logo.

BTW, do you have the LCD panel model number?
http://www.ebay.com/itm/SHARP-LC-52L...p2047675.l2557

Part# RUNTK5208TPZZ and RUNTK5209TPZZ

[Malachi]

Re: Sharp LC-52LE640U flashing logo.

Is it one of these numbers?
In my picture folder its posotioned coeerectly, I don't know why it sideways here.

[budm]

Re: Sharp LC-52LE640U flashing logo.

Is it one of these numbers?
In my picture folder its posotioned coeerectly, I don't know why it sideways here.

That is it, BTW, see the my previous post for the Sharp P/N for the LED strips.