e701i-a3 no picture but backlights

[nomoresonys]

Re: e701i-a3 no picture but backlights

A video is worth a thousand words...if you already know this then maybe it will help someone else: https://www.youtube.com/watch?v=4v8DcqCNG4A

[nomoresonys]

Re: e701i-a3 no picture but backlights

Well what was tested? people usually start with testing the voltages at the connector on the powerboard with the cables all hooked up, it's the connector that the cable from powerboard to mainboard hooks into, most times there's a legend/map nearby that gives the expected voltages, you measure them with your mutimeter, set meter to 20 vdc then report them, put neg probe on chassis metal ground, pos probe on pin of connector, measure in standby take note, leave probes where they are then power on tv and again take note of voltages, report them here, example pin 1-ps-on-0 volts standby-power on-3.3 volts.

[cueballsi]

Re: e701i-a3 no picture but backlights

Here is my post form before... you may not have a bad tcon board... it may be something else ... in the youtube vides it will tell you wat to measure to verify if the tcon is bad... also in the other video to see what side is bad too if it is the drivers


OKAY got the TV going to dig into it tomorrow and test some resistances on the TCON board.

SYMPTOMS- has back light, no image, 2 or 3 bright white spots at the bottom

I found these videos:

How to test Mosfet:
https://youtu.be/yTnkOfwBGGE

How to tell you how to determine which side of the panel is bad:
https://www.youtube.com/watch?v=cyCKoMi_5IA

How to remove the Ribbon:
https://www.youtube.com/watch?v=sJ0EzOuckyU

Okay so I have no good news to report, but it may not all be bad news.

I inspected both sides of the drivers and none of the connectors looked burned out or brown or anything, but I know they might not always appear burnt out so this doesn't really tell me too much.

I put in the used t-con I got off ebay and got no picture with either of the sides disconnected, just the same backlit screen with no picture. I tried just connecting both sided and turning the tv on just to see and still nothing. This leads to me believe I might have just gotten a bad t-con - I got my hands on a multimeter so I'm going to try testing to see if that's the issue.

If it turns out that this t-con isn't bad, then the only other thing I can think of is that somehow the screen or the t-con isn't being correctly powered, and that's why I'm not getting picture regardless of what ribbons are plugged in. But then I'm back at square 1 and I have to figure out what needs to be fixed. Maybe I'll get lucky and it's nothing too severe, or maybe this thing's a lost cause.

If anyone's got any advice it'd be greatly appreciated. Thanks again!

[gimmedatpretzel]

Re: e701i-a3 no picture but backlights

Okay so I have no good news to report, but it may not all be bad news.

I inspected both sides of the drivers and none of the connectors looked burned out or brown or anything, but I know they might not always appear burnt out so this doesn't really tell me too much.

I put in the used t-con I got off ebay and got no picture with either of the sides disconnected, just the same backlit screen with no picture. I tried just connecting both sided and turning the tv on just to see and still nothing. This leads to me believe I might have just gotten a bad t-con - I got my hands on a multimeter so I'm going to try testing to see if that's the issue.

If it turns out that this t-con isn't bad, then the only other thing I can think of is that somehow the screen or the t-con isn't being correctly powered, and that's why I'm not getting picture regardless of what ribbons are plugged in. But then I'm back at square 1 and I have to figure out what needs to be fixed. Maybe I'll get lucky and it's nothing too severe, or maybe this thing's a lost cause.

If anyone's got any advice it'd be greatly appreciated. Thanks again!

[nomoresonys]

Re: e701i-a3 no picture but backlights

You bet, good luck, let us know how it goes.

[gimmedatpretzel]

Re: e701i-a3 no picture but backlights

Found this video as an example of only the T-con needing to be replaced. What he describes in the beginning of the video sounds like exactly what happened to me.

https://www.youtube.com/watch?v=SPLlN2m0nOU

But to be safe I'm still going to test with each of the sides disconnected. I'll post updates later this week or over the weekend, wish me luck!

Thanks everyone

[nomoresonys]

Re: e701i-a3 no picture but backlights

Yes, good idea, if you see the lines or distortion with one side connected at a time, then you know it's likely a panel issue, if you get half a good picture on each then you should be ok.

[gimmedatpretzel]

Re: e701i-a3 no picture but backlights

You know I think I've read about every post in this thread but my memory is pretty much gone, I'm not sure if this is the type tv that the bad panel is taking out the tcons or not, that's if the panel IS bad, if it is, I'm sure it's in this thread somewhere, they went over every detail more than once. Member budwich would probably know, he spent a lot of time with this thread.

I just read through the entire thing over the last couple days and it seems like the most likely cause of T-con failure is one side of the panel drivers, although there are cases on other forums/videos of people just swapping out the t-con and being good to go. I didn't see any obvious visual signs that either side of the drivers failed on my set (no dark spots or anything) but I want to minimize the risk of going through multiple T-cons to try and diagnose it.

I bought a used T-con on ebay that should hopefully be here later this week so I'll try disconnecting each side of the drivers and seeing if there's any signs pointing to one set being the problem. But if the picture looks fine either way and there's no difference in brightness/lines/color issues, then maybe the T-con just went independently.

[nomoresonys]

Re: e701i-a3 no picture but backlights

You know I think I've read about every post in this thread but my memory is pretty much gone, I'm not sure if this is the type tv that the bad panel is taking out the tcons or not, that's if the panel IS bad, if it is, I'm sure it's in this thread somewhere, they went over every detail more than once. Member budwich would probably know, he spent a lot of time with this thread.

[gimmedatpretzel]

Re: e701i-a3 no picture but backlights

I think I realize what you're saying - I haven't considered the possibility that it really is just my T-con board that needs to be replaced. I've been operating on the assumption that one side of the drivers is what caused the T-con failure, but I'm guessing it's possible that the T-con fried independently right?

So if I test with the drivers disconnected on each side and don't see any obvious signs of either side being bad, then I obviously wouldn't want to rip off any of the drivers and I can just reconnect them both and call it a day.

[gimmedatpretzel]

Re: e701i-a3 no picture but backlights

See if this helps, see how he determined his issue right around 2:55? watch whole video, see if you have a similar setup: https://www.youtube.com/watch?v=OiXhb_jGJKE

So I think I'm a step behind this - I'm not getting any picture at all, just backlights and sound. Which based on previous posts in here, it sounds like I need to replace the T-conn board before I can determine which side is giving me the problem, right?

So my next step should be to put in the new T-conn and turn the TV on with one of the drivers disconnected and see if I get any picture.

Does that make sense?

[nomoresonys]

Re: e701i-a3 no picture but backlights

Keep looking on youtube, it's all there, just hard to locate sometimes.

[nomoresonys]

Re: e701i-a3 no picture but backlights

See if this helps, see how he determined his issue right around 2:55? watch whole video, see if you have a similar setup: https://www.youtube.com/watch?v=OiXhb_jGJKE

[gimmedatpretzel]

Re: e701i-a3 no picture but backlights

Absolutely NOT, you first need to determine without doubt that you have bad drivers on one side, because it can not be undone and should NOT be done if you have a whole different issue, most of the time that is determined by having lines and or a distorted screen on the side that is plugged in, while the other side is blank of course, because the ribbon cable on that other side is unplugged. From what you describe, you have a different problem.

I thought I had the same problem described by most people in this post - backlights but no picture. From what I understand, it sounds like my T-con needs to be replaced in order for me to test out if one of my drivers has failed, correct? Because without the new T-con, I won't be able to get any picture and determine which side of my drivers are bad.

My main question was about how exactly to test each side with the new T-con. There are 4 ribbon wires that lead into the T-con, which should all be connected, right? The only thing disconnected should be the left or right side drivers to test which one is the problem.

Am I completely off base or does that sound like my next move?

[nomoresonys]

Re: e701i-a3 no picture but backlights

Absolutely NOT, you first need to determine without doubt that you have bad drivers on one side, because it can not be undone and should NOT be done if you have a whole different issue, most of the time that is determined by having lines and or a distorted screen on the side that is plugged in, while the other side is blank of course, because the ribbon cable on that other side is unplugged. From what you describe, you have a different problem.

[gimmedatpretzel]

Re: e701i-a3 no picture but backlights

Hi everyone, I've read through dozens of pages of this thread and I think I have a decent idea of what I'm doing but just want to get some confirmation. I'll try to outline my situation so far:

I have the classic issue with no picture/'blue' screen/audio still works/the whole nine. I've taken off the back panel and tried taking off the left and right driver wires with no changes (leading me to believe that the T-Con board is fried). I have not tried purchasing a new T-Con board or anything, all of this has transpired over the last 24 hours, but I came across this forum and I want to figure out what I might need to do moving forward.

It sounds like my next move is to buy 2 new T-Con boards and test them out with the left and right side disconnected to figure out which side of my drivers is shot.

My main questions are:
- when I get the new boards, Should I connect them fully before turning the TV on (ie. should all 4 wires be connected directly to the TCon when I test out with the left and right side disconnected?)
- assuming I'm able to figure out what the problem side is on the first try, is there any reason to test out the other side?
- Once I figure out which side is fried (let's say for argument's sake, it's the left side) - all I need to do is pull off the drivers from tht side and I should be home free?
- is there a certain retailer or store I should try to buy the T-Cons from?
- Are there any other things I'm missing?

I don't have any experience with soldering or measuring voltage or anything so I have no issue with buying 2 new TCon boards even though I know it might not be the most cost effective.

I've read through about 40 pages of the forum so admittedly it's possible that these questions have been answered before, I think I'm capable of doing all of this but I just would prefer if it was spelled out for me.

Thanks a ton for all your help

[cueballsi]

Re: e701i-a3 no picture but backlights

Came across this video, might help with figuring out which side is the problem. https://youtu.be/cyCKoMi_5IA

YUP, that is what I used to diagnose which side... great info ...

[Hornnumb2]

Re: e701i-a3 no picture but backlights

Came across this video, might help with figuring out which side is the problem. https://youtu.be/cyCKoMi_5IA

[cueballsi]

Re: e701i-a3 no picture but backlights

glad it all worked out... NOW... who can answer my questions

Thanks guys, i have removed the screen using 4 glass and tile suction cups and an extra set of hands. No issues and it was actually pretty easy using this method. I made sure to align all of the suction cups so they were all holding about the same weight. I removed all the other filters and there is a thick clear plastic layer that the light travels through from the edge lit leds. Layed all the layers down in order so hopefully re assembly is easy. Returned my power supply and will sell my extra tcon once i know its working. Waiting now on the replacment led strips. They are very hard to remove as they are glued into place. And there is a small black cable conduit that runs directly in front of the strips that is also very well glued down. A razor did the job luckily i didnt cut myself or any wires. I will update once its done. Wish me luck !

[BOOSKI00]

Re: e701i-a3 no picture but backlights

Thanks guys, i have removed the screen using 4 glass and tile suction cups and an extra set of hands. No issues and it was actually pretty easy using this method. I made sure to align all of the suction cups so they were all holding about the same weight. I removed all the other filters and there is a thick clear plastic layer that the light travels through from the edge lit leds. Layed all the layers down in order so hopefully re assembly is easy. Returned my power supply and will sell my extra tcon once i know its working. Waiting now on the replacment led strips. They are very hard to remove as they are glued into place. And there is a small black cable conduit that runs directly in front of the strips that is also very well glued down. A razor did the job luckily i didnt cut myself or any wires. I will update once its done. Wish me luck !