e701i-a3 no picture but backlights
Collapse
X
-
-
Re: e701i-a3 no picture but backlights
Just want to say thanks to Freak and everyone else in this thread that has shared their knowledge and experience. Because of it I was able to get a Vizio M701d-A3R going again. I made a video showing the steps I took and tried to summarize what I've learned from the 49 pages of discussion here.
Here's my video if anyone is interested.
https://youtu.be/sJ0EzOuckyUComment
-
Re: e701i-a3 no picture but backlights
Just want to say thanks to Freak and everyone else in this thread that has shared their knowledge and experience. Because of it I was able to get a Vizio M701d-A3R going again. I made a video showing the steps I took and tried to summarize what I've learned from the 49 pages of discussion here.
Here's my video if anyone is interested.
https://youtu.be/sJ0EzOuckyUComment
-
Re: e701i-a3 no picture but backlights
Hi guys-
I just fixed up a Vizio m701d-a3r. Same problem as the majority of others, left panel was bad.
I now have the middle of the screen with 2 huge vertical bars covering up. I will post a pic once I get down to the dungeon to take one. Curious as to whether this is bad tcon or bad bottom lcd?Comment
-
Re: e701i-a3 no picture but backlights
Hi guys-
I just fixed up a Vizio m701d-a3r. Same problem as the majority of others, left panel was bad.
I now have the middle of the screen with 2 huge vertical bars covering up. I will post a pic once I get down to the dungeon to take one. Curious as to whether this is bad tcon or bad bottom lcd?Comment
-
Re: e701i-a3 no picture but backlights
I thought that too. I cleaned them and reseated them. Now I get this???
https://drive.google.com/file/d/1OQL...w?usp=drivesdkComment
-
Re: e701i-a3 no picture but backlights
Wondering if it's a bad cable? Tried switching them around to see if it was a bad cable or bad panel on the bottom. Not sure if I screwed everything up by doing that.Comment
-
Re: e701i-a3 no picture but backlights
I thought that too. I cleaned them and reseated them. Now I get this???
https://drive.google.com/file/d/1OQL...w?usp=drivesdkComment
-
Re: e701i-a3 no picture but backlights
I tested the mosfit and get 15.6v on the top. 15.6v on the right bottom and 0v on the left bottom.
I was tapping on the tcon to panel ribbon on the offending side and it would flicker to get the whole vertical line red. Lost for nowComment
-
Re: e701i-a3 no picture but backlights
ok... that's good and bad. It appears to show that there is something up in the area. How are switching / reseating the cables. You are releasing the clamps and then lightly lifting the ribbon which should then "pop / spring out" from the connector just based on ribbon "flex" / tension. You need to look closely at the cable itself to ensure all the conductors are ok (lightly gold plated, i think). Further look under the clamp to see if things are ok there with the pins / "fingers". Further, the cabling associated with the "lines"... is this on the same side that you indicated was the "bad side". Lastly, when you said you fixed your set, what exactly did you fix?Comment
-
Re: e701i-a3 no picture but backlights
ok... that's good and bad. It appears to show that there is something up in the area. How are switching / reseating the cables. You are releasing the clamps and then lightly lifting the ribbon which should then "pop / spring out" from the connector just based on ribbon "flex" / tension. You need to look closely at the cable itself to ensure all the conductors are ok (lightly gold plated, i think). Further look under the clamp to see if things are ok there with the pins / "fingers". Further, the cabling associated with the "lines"... is this on the same side that you indicated was the "bad side". Lastly, when you said you fixed your set, what exactly did you fix?
I've been undoing the clamp on the ribbon cables and pulling down on them instead of up. When I put them in I push them up then clamp down. Another area where I show my being a novice at this.
Glad I got a free m series instead of the e since the m series is like the Sony and sharp sets where there is a protection mode to not short out the tcon.
When I picked up the tv, it would only turn on to backlight..no Vizio logo, no menu, no volume control.
To do the 'fix' I followed the steps to figure out which side of the panel was bad by undoing the small white ribbon connector on the left side. Got lucky that was the correct side. Once I figured that out, I completely removed the LCD and ribbon from the glass. I then put the screen back together and send the pictures you saw earlier.
Once I couldn't figure out why the screen had the vertical lines, I then started looking at the LCD boards on the bottom where they connect from the tcon through the lvcd (I think that's the name) cable. I took the ribbon cables and tried switching them to see if the problem happened on the other side.
The problem now is that I see a spot in the ribbon cable conductor where it looks like there's a bent pin or something that caused it to look darker. Unsurprisingly both ribbon cables have that problem now and the other side of the tv screen is doing something similar.
Sorry for rambling on. Just getting frustrated at myself for not researching more before tinkering. I'll post a picture of what the ribbon cable connector looks like as well as a picture of the screen now.
I'm hoping I can figure out the pin that's bent and fix it, then get a couple new cables, and put them on the correct way.
FYI..the part of the ribbon that's messed up is where it would enter the lcd, not the tcon side.
Thank for the help. I'm hopeful this set can be salvaged.Comment
-
Re: e701i-a3 no picture but backlights
thanks for the added info... it does help but also opens up questions.
Quote: "Once I figured that out, I completely removed the LCD and ribbon from the glass. I then put the screen back together" ... this is probably a "misstatement" I hope. Handling that actual panel layers is a very "dangerous task". I hope what you did was remove the top plastic bezel which gives you access to the "tab tapes" on the side of the "glass panel" which you then removed along with the edge board / drivers which the "tape" was soldered to.... right? People only have to take apart the panel / layers if they are looking to replace the LED backlights which I assume you did not do / did not need.
Certainly post a picture of the cable ... as good as possible so the forum can see what you are referring to... it is a good chance that it is you problem and that the tv itself is actually "fine" ... or as fine as those already saved by this method (tab removal).Comment
-
Re: e701i-a3 no picture but backlights
thanks for the added info... it does help but also opens up questions.
Quote: "Once I figured that out, I completely removed the LCD and ribbon from the glass. I then put the screen back together" ... this is probably a "misstatement" I hope. Handling that actual panel layers is a very "dangerous task". I hope what you did was remove the top plastic bezel which gives you access to the "tab tapes" on the side of the "glass panel" which you then removed along with the edge board / drivers which the "tape" was soldered to.... right? People only have to take apart the panel / layers if they are looking to replace the LED backlights which I assume you did not do / did not need.
Certainly post a picture of the cable ... as good as possible so the forum can see what you are referring to... it is a good chance that it is you problem and that the tv itself is actually "fine" ... or as fine as those already saved by this method (tab removal).
You are correct. I only went down to where I could safely remove the tab tapes
I took a couple pics. First one is what tv looks like now. Identical area of both sides of screen (just different colors). Next couple pics are of the 2 ribbon cables where I see what looks like a problem. Last pic of of the slot where the ribbon cable goes into the LCD from the tcon board.Comment
-
Re: e701i-a3 no picture but backlights
:-( certainly appears that you have found an issue. The question is what is causing the problem especially since you switched cables and it appears now the "switch" has caused the other cable to have a similar issue. The last picture is not clear enough to see any problems with the connector. You need to look very closely... maybe using some form of magnification to check the area.
With the power off, can you put back the cable the way it would be normally and take a close up of the area again. This will show us how you are "seating" the cable. Take a picture of one of the other cables that is currently seating to compare.
Further, from the way that the cable is "damaged", you are likely not going to be able to easily see the problem from the "front" as it is likely in the "last miillimeter" IF it exists.
IF you are lucky, you should be able to find replacements.... BUT you need to find the ROOT cause otherwise you will be just repeating the "failure".
Further, the cable may "saved" with some very careful trimming to remove the millimeter or so of the bad end.... I think some have done it in the past... but it is probably a long shot depending on your skill and tools. Still further, now that you know where the problem "starts" and that you may have ruined a couple a cable ends... don't do much more with that connector in terms of inserting... BUT I do believe that the cables might be reversible... meaning that the other can be switched around to insert into the "bad connector". This could be a ONE TIME test... to see if inserting into the connector causes the damage. Take the other end of a bad cable and check it to see that is "good". IF so, try inserting it into the connector, clamp, then unclamp and remove. IS the result, a now damaged cable? Hopefully you understand.... good luck.Last edited by budwich; 11-29-2019, 08:40 PM.Comment
-
Re: e701i-a3 no picture but backlights
:-( certainly appears that you have found an issue. The question is what is causing the problem especially since you switched cables and it appears now the "switch" has caused the other cable to have a similar issue. The last picture is not clear enough to see any problems with the connector. You need to look very closely... maybe using some form of magnification to check the area.
With the power off, can you put back the cable the way it would be normally and take a close up of the area again. This will show us how you are "seating" the cable. Take a picture of one of the other cables that is currently seating to compare.
Further, from the way that the cable is "damaged", you are likely not going to be able to easily see the problem from the "front" as it is likely in the "last miillimeter" IF it exists.
IF you are lucky, you should be able to find replacements.... BUT you need to find the ROOT cause otherwise you will be just repeating the "failure".
Further, the cable may "saved" with some very careful trimming to remove the millimeter or so of the bad end.... I think some have done it in the past... but it is probably a long shot depending on your skill and tools. Still further, now that you know where the problem "starts" and that you may have ruined a couple a cable ends... don't do much more with that connector in terms of inserting... BUT I do believe that the cables might be reversible... meaning that the other can be switched around to insert into the "bad connector". This could be a ONE TIME test... to see if inserting into the connector causes the damage. Take the other end of a bad cable and check it to see that is "good". IF so, try inserting it into the connector, clamp, then unclamp and remove. IS the result, a now damaged cable? Hopefully you understand.... good luck.
I then tried fixing the ribbon cables by 'trimming' the problem area off the end. I then seated the cables back in and have the exact same result.
I am able to jiggle one cable to get the middle bar to change colors, but it never brings up a picture. The new messed up section on the right side is now stuck in that multicolored vertical bars, never changing while jiggling either cable.
Throughout my research, it is looking more like the bottom panel now has something messed up. I wonder if I'll be able to take any of the driver's from the bad panel and be able to fix the bottom drivers?
My next step is to get a new tcon board and new ribbon cables I guess to double check that the bottom drivers are actually the problem.
While waiting on the new parts, I'm going to gently move the rest of the bottom led driver cables to see if the tab bonding is the problem. Hopefully this isn't the case.
Thanks for all the help. I'm wondering if in my haste to fix, I screwed something else up that wasn't broken in the beginning.Comment
-
Re: e701i-a3 no picture but backlights
I think you misunderstand what I asked. I wasn't expecting that reversing the cable ends would get you a picture or improve the situation. What you needed to check was what happens when you put the "reversed end" into the tcon connector... do you end up with the SAME "physical damage" in the same area? That's what you needed to verify.Comment
-
Re: e701i-a3 no picture but backlights
I think you misunderstand what I asked. I wasn't expecting that reversing the cable ends would get you a picture or improve the situation. What you needed to check was what happens when you put the "reversed end" into the tcon connector... do you end up with the SAME "physical damage" in the same area? That's what you needed to verify.Comment
Related Topics
Collapse
-
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?by Tynan DillI was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming...7 Photos -
by m1ch43lzmHi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
by howardc64Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....-
Channel: Troubleshooting Computer Displays
-
-
by maxim2511My Oled Tv is 55inch tv, 3 days ago I notice that middle of the screen is getting warmer and on picture I have ghosting, missing red color. Color red was still displaying, but it was not so strong as corners of the screen and watching some movies makes me angry.
Then I get an idea to take it apart and clean boards from dust.
In side of Tv was not so bad, I take compressed air in can, and gently blow up.
Also I was thinking to styrofoam sponge to isolate power board from screen that the middle of the screen will not worm so much. Because Led on screen when gets higher... -
Hi,
I have a VIZIO E70-E3.
Symptoms: Black screen, no picture, but LED backlights are working.
I probed the power board and voltages are as listed on the board.
Main board appears fine, too.
I believe the problem is either a bad T-CON board, or connection to LCD, or bad LCD.
There are two separate ribbon cables feeding the LCD.
If both are connected, the screen is black.
If only the ribbon cable that feeds the right side of the screen (when viewed from the front) is disconnected, the left side of the screen shows picture and... - Loading...
- No more items.
Comment