Sharp LC-70LE640U LED HDTV Dim perimeter

[JZOSU1129]

I was watching my 70" LED tv, that i purchased about 6 months (refurbished) and noticed that about 8" of lighting went dim around the lower perimeter.

It returned to normal a few times, but now appears to be out for good. The tv is still watchable but in bright scenes, it can be annoying. Can anyone explain what the problem is, and whether this is something i can fix myself, can have repaired, possible repair costs, etc.

I've attached some photos for reference.

[freakaftr8]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

You have a backlight problem.. Looks to be an edgelit LED system.. The lower right strip, some of the LEDS went bad. The reason the LEDS to the left of them are brighter is due to overcurrent from the bad ones going out.. Either a bad string of LEDS or a bad connection. either way it can be a tedious job. Especially if the strip is bad, the LCD panel needs to be removed..

First you need to start by removing the rear cover, with the power disconnected and take clear pictures of the power supply. This is the board the power cord goes into.

[JZOSU1129]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Thanks for the quick reply.

I am waiting for the wife to go out of town in order for me to take the TV down to look at it.

Next steps
-I will take off the back cover and take photos of the area in questions as well as the power board.
-Post those photos.
-Check all connections and re-set any connections in the area of the problem that might look suspicious.

Given the fact that the lights went in and out over a few days (and now have not come back on) does that give any indication of anything?

What kinds of repair costs am I looking for on something like this? Is this something I could do myself or would it be something that a repair shop would end up having to do?

[Alastair E]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Its a difficult repair with high risk of LCD panel damage--due to its huge size. 70" of 0.5mm glass panel--is FRAGILE!

A 42" is bad enough to potch with!

This has to come off, complete with its tab-strips connected to the PCB's etc, and these too are very delicate. Do Not Strain Anything--even letting the tab-PCB's flop under their own weight can wreck them/break vital connections between panel and PCB....

The dealer--would write the set off, as a dealer repair would be replace the whole assembly, backlight, LCD and T-Con etc....

Then you have the issue of replacing the actual LED's. Advise all the LED strips are replaced--all at the same time--with new ones--IF they can be got....

[R_J]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Here is the lcd manual, I helped a friend replace one of these panels for this very reason, we had one with a broken screen, the led stripes are double side taped down to the metal, kind of hard to remove but could be done.
be very very carefull, it is a pain in the ass to change. also there are `B' grade panels available from Sharp.

[Corvy1]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Hi I have same problem with mine did you get resolved and if did what was the fix thanks

[Corvy1]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Hi did you figured out what was wrong with the tv I have same issue thanks

[truep]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Many refurbs (factory) have a 1 year warranty. If yours does, have them fix or replace it. Check that first BEFORE you open it up!

[Rky290]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

I have a similar problem. Did you ever find a fix?

[J_Internet]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Hi,
Any update? I have the same issue on my lower left. Also cant seem to find the part.

Thanks!

[newtothis]

Re: Sharp LC-70LE640U LED HDTV Dim perimeter

Seems like a common failure with the LED's in these models.

As stated previously the job of replacing them is not an easy one, There is so much that can go wrong ESPECIALLY with an inexperienced DIY'er. IF you can get the strips out you can replace them, IF you cannot source the strips they are repairable tho fiddly. I have done many SMD LED strips now.