Hey together,
my TV shows one blue bar:
any ideas?
2018, October 19 - 15:33
#1
fakerli
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SONY KDL-46EX728 blue vertical bar
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Check COF cable to screen and panel connection.
1
Checked. Seems fine.
I even changed the LD Board. No success :(
0
Hello.
It looks really strange to me, that you get visual info on that bar. I mean, the icons of the menu are there, and they look like fine to me.
Can you hook it up to a source, and take some pictures with test patterns or completely solid colors? R, G, B, W?
Cheers
0
Hey, thank you for you answer:
I tried my best to shoopt a photo of it, because i removed all the frames etc.
Edit: The pictures are upside down. Hope you don't mind
0
You have a really weird screen issue there.
How is the connecion between the motherboard and the screen itself built up? Do you have a Tcon? Are the flex cables detachable?
A few pictures would come in handy.
0
Yes, I have a TCON. The flex cables are detachable from the LD-Board to the Tcon. But I changed them and they seem to be fine.
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Ok, starting with the least destructible method: lift the short flex cable, that runs from the t-con to display board wich corresponds to the defective side. once lifted, put some isolating tape on the pins of the connector, starting from the far side, covering approx 4 pins. Put flex cable back in place, start the tv and see what happens. If no change, repeat the process, covering more pins. After a few tries, you should have change on screen, possibly positive one.
Report back, what you got.
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Hey, I tried your method starting from the side where the problem was. Following results: It's only on dark spaces noticable.
First picture: Nearly black background of my desktop
Second picture: No input / total black
Thank you very much for your help :)
Edit: Sorry for the near shots. I am alone at home right now and it's hard to setup the TV alone and shoot a photo
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When you have time and someone to help you, I would like to see the test pattern on the screen, mentioned earlier in this post. 2.jpeg, I believe.
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Wow, you're fast :)
I'm not alone anymore, soooo:
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Might be, but I am running out of ideas.
On the faulty side, do you have flexible tabs attached to the LCD screen itself? Are they not significantly hotter than the others on the good side? With much care, can you poke them a bit, see if anything changes on the screen? I repeat, be very cautious, they are only glued to the screen, and they are fragile.
0
Yes, I got those but none of them is hotter as the others. Poking them does nothing at all. I absolutely have no idea what to try next.
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Are these side tabs symmetric? I mean, are there same amount of them on each side? And in the same height?
If yes, there is a workaround, but we should leave it for very last, as it involves destructive approach. This can't be undone, and there is a risk of completely destroying the LCD panel itself. So think trough very well, then decide.
This looks the following: you need to tear off the side drivers (all of them) on the bad side. The other side drivers will take care of the picture. You will lose half of your refresh rate, but you have a chance of getting a good picture after this. I read this method on Badcaps forum, there is a good 90% rate, where they fixed 70" Vizio TVs with this method. They all had Sharp panels, if this means something.
Tearing off must be done completely voltage-free, you should shut down the set and wait for the caps to discharge.
After tearing off, clean the glue residues with alcohol. Tearing off and cleaning is easier if you pre-heat them with a hair dryer.
But once again: wait with this, as someone else may have an other good (and not so irreversible) idea.
At this point, I would say it is LCD panel failure, and other than the above approach, I do not have any further ideas. Sorry.
0
These are no side tabs.
There are 4 for each side at the bottom of the screen.
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Those are the source drivers, they are not replacable, can't be bypassed. Leave them as they are.
I am sorry, have no more ideas. I will keep thinking, maybe something comes up.
Edit: maybe you can continue the isolating test on the connector, but this time starting from the other side of the connector.
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I consider buying a new TCON (from china). Do you think there might be a possibility a new TCON could fix this?
Greetings and thanks :)
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I am afraid, no. A defective tcon is not able to produce the symptoms on your display.
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