Sharp Aquos LC-70LE650U

**Davi.p** · 09-07-2018, 02:13 AM

Re: Sharp Aquos LC-70LE650U

one on either side of the room

That's incredible... one is not enough??

**b43n70n** · 09-07-2018, 09:40 PM

Re: Sharp Aquos LC-70LE650U

well, it's a big room in a large building.

**Davi.p** · 09-08-2018, 03:54 AM

Re: Sharp Aquos LC-70LE650U

It's incredible also the fault, it is a panel issue for me, but i never thought of a panel issue that has something to share with a wall socket power issues..

**budwich** · 09-08-2018, 08:24 AM

Re: Sharp Aquos LC-70LE650U

does your cleaners also do windows??? :-)

without taking the set back off (and maybe the front bezel), you aren't going to find your answer very easy.

My guess would be water ingression either from "good people" or possibly long term humidity. Inspection of the connections / cabling / tabs will tell the story.

**Davi.p** · 09-08-2018, 12:10 PM

Re: Sharp Aquos LC-70LE650U

It's the third time that i push the link Previous Thread instead of PostQuick Reply and i have to rewrite all with my f****ing tablet, Sob..

Now an intriguing question for you, does the two tv 's were be always switched on and off at the same time? In other words can you with the help of the forum tell me the total usage hour count of both that is visible in the secret service menu? Thanks, i have an insane idea...

**b43n70n** · 09-10-2018, 07:54 AM

Re: Sharp Aquos LC-70LE650U

These TV's are mounted high enough that they do not get touched by anybody. They are both turned on only during events and then shut off the rest of the time. I would estimate they are on less than 10 hours a week and that is a high estimate. One thing I regret not doing is using some kind of line conditioner since we have so many electrical storms here in Florida.

As for the secret service menu. I went through all 27 pages and did not see a "total hour counter". Unless I was in the wrong service menu...

I have the back cover off and I did a visual inspection of all the components on the board the power comes in on and I didn't see anything out of the ordinary.

There is a whine sound coming from this board that would annoy me if I hear that in my living room. Not sure if that should be there.

Any ideas anyone has would be a tremendous help as I am not sure where to go from here.

**budwich** · 09-10-2018, 08:16 AM

Re: Sharp Aquos LC-70LE650U

you need to look at the edge boards along the bottom where the cables from tcon connect to the bottom. From there you need to look along the edge boards to see if there is any "moisture looking dry stuff". Further, as part of the "testing", you can try isolate your problem more by disconnecting, one at a time, the cables going from the tcon to the panel and see if this changes anything. This will tell you more about the problem.

**Davi.p** · 09-10-2018, 09:03 AM

Re: Sharp Aquos LC-70LE650U

The service menu is not mentioned in the user guide, i have watched a service manual but unforturnately it seems taht Sharp did not store unit working hours like the other brands, anyway i report you the method of another model:
"
2. Method of shuts down for Power supply
Please execute the following procedures to shut down Power supply from the state of normal operation.
1) Keep touching the power supply key on the set for 5 seconds from the state of watching.
* The screen disappears when power supply key is touched, but Keep pushing the power supply key.
2) A central icon lights between 500ms when the power supply shuts down.
Please separate the finger from the power supply key when lighting of a central icon is confirmed
3. Entering and exiting the adjustment process mode
Please execute the following procedures to enter the adjustment process mode when the power supply shuts down.
1) While holding down the “VOL (-)” and “INPUT” keys on the set at once, touch the power supply key on the set.
Please separate the fingers from key on the set when boot-up is confirmed with lighting of a central icon etc.
After a while, The letter “K” appears on the screen. This state is in Inspection mode.
2) Next, hold down the “VOL (-)” and “CH ( )” keys on the set at once.
Multiple lines of blue characters appearing on the screen indicate that the set is now in the adjustment Process mode.
If you fail to enter the adjustment process mode (the display is the same as normal startup), retry the procedure.
3) To exit the adjustment process mode after the adjustment is done, unplug the AC power cord to force off the power.
(When the power is turned off with the remote controler, once unplug the AC power cord and plug it in again. In this case, wait for 10 seconds or
so after unplugging.)
"

For instance, i was suspecting programmed obsolescence...

**b43n70n** · 09-10-2018, 10:29 AM

Re: Sharp Aquos LC-70LE650U

I was able to get to the service menu with the blue text. There were 1-27 pages of information as I pressed the channel up and down buttons. I could change some of the items with the volume up and down. But I did not see anything about working hours.

I disconnected the tcon connectors one at a time and the problem persisted with the left side (while looking at front of TV) connected but went away with the right side connected. So with the left side disconnected there were not flickering lines.

**b43n70n** · 09-10-2018, 10:50 AM

Re: Sharp Aquos LC-70LE650U

I took off the left side metal bar and disconnected the ribbon cable on the left side and now the TV is working properly without having to cut anything off.

Is this really all there is to it?

**b43n70n** · 09-10-2018, 11:18 AM

Re: Sharp Aquos LC-70LE650U

Looks like I jumped the gun a little. After injecting a signal there are lines on the left side. Is this where I have to rip off the brown tabs?

**Davi.p** · 09-10-2018, 11:48 AM

Re: Sharp Aquos LC-70LE650U

I dont like much the ripping off of the side tabs, there are maybe better ways but with language limits and without to know your skill level and time availabilty i prefer to stop here..

**budwich** · 09-10-2018, 11:49 AM

Re: Sharp Aquos LC-70LE650U

slow down and make sure you and the forum understand what you are doing BEFORE you go too far.

The "test" to see if you have to "rip off the tabs" is to get at the little corner cable on that side that you think is the problem. Its unclampable so disconnect it... it breaks the connection between the bottom edge board and the side edge board / tabs. Post a picture of the resulting image and go from there.

**b43n70n** · 09-10-2018, 01:31 PM

Re: Sharp Aquos LC-70LE650U

Sorry for the poor choice of words. I have been working with electrons all my life, just not with 70 inch monitors although I've replaced my share of caps in Dell monitors.

I have attached an image of the screen after disconnecting the ribbon cable on the bottom left side of the screen...

The blue at the top left of the screen is a reflection of a monitor, I tried to turn it to reduce the amount of reflections but that was missed.

**Davi.p** · 09-10-2018, 01:51 PM

Re: Sharp Aquos LC-70LE650U

Right to make it clear, it's evident that your screen has at least one of the gate drivers faulty, the minimal goal is to insulate all the drivers on that side, the most destructive way is to rip off those, buta more conservative way (useful or not useful) is to put a little piece of adhesive tape on the flat cable between tcon and panel on the faulty side, about wich signal to mask i'm not sure, never tried, but i suggest to start with the vertical start pulse, something expressed with a serigraphy like Vst or vstp, that may or may not be present on tcon.

**b43n70n** · 09-10-2018, 02:03 PM

Re: Sharp Aquos LC-70LE650U

I don't believe I see any silk screening on the tcon board where those connections are...

**Davi.p** · 09-10-2018, 02:35 PM

Re: Sharp Aquos LC-70LE650U

I don't see much with a little photograph but seem almost free of silk screening. The osciloscope can be an answer only for expert people, i don't even have one, so right to not let you lost any time i stop with any other suggestion, but it remain strong the sensation of a programmed obsolescence trick.

**budwich** · 09-10-2018, 02:38 PM

Re: Sharp Aquos LC-70LE650U

The gate drivers can never be fixed anyways so the "minimal method" doesn't buy you much, if anything and you further are playing with plugging and unplugging tcon cables at a risk of damaging them or the connector. Further depending on what the failure of the side driver is, potentially leaving them connected may ultimate load the remaining good side and cause it to fail sooner.... just my read on things, I have no actual data / info to support this other than having saved a 70 in sharp using the "tab removal method" that is still working for the last 3 years.

your picture shows a bad driver in the lower left of the screen that is causing the horizontal line across the screen which slowly fades as it goes to the right. The darkness of the left side is caused by the remaining drivers on that side not get "signal" because of the disconnected interconnection cable and the resulting load of the other side.

**b43n70n** · 09-10-2018, 03:33 PM

Re: Sharp Aquos LC-70LE650U

I tested several times covering up some pins on the tcon connector but didn't have any success with that and I am afraid of damaging that connector. Looks like the only thing left to do is surgery, right? Do they all need to be cut or should I start from the bottom?

The hair on the back of my neck stands on end just thinking about this surgery.

Sharp Aquos LC-70LE650U

Sharp Aquos LC-70LE650U

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