What is causing new TV T-CON board to fail?

[Lisanimaux]

Hi,
I sought your knowledge to help me fix my TV in January and you were all very helpful. I hope someone can help me again!

You can read the whole story about my TV here, but to summarize: my Toshiba FireTV started flickering every two seconds in early January. The general consensus was that the T-CON board was faulty, so I got a brand new one with new ribbon cables. Thankfully, this solved the issue! However, six weeks later it started again and we're back to square one.

I opened the back of the TV to do a few tests. I tried other ribbon cables to make sure the new one wasn't damaged, but the result is still the same. The problem is still coming from pins #1 and #2 on the left side of the T-CON board, which leads me to believe that the problem is induced by another component.

Could this be coming from the display? Is there a final thing I can try to salvage the TV? My knowledge with electronics is still limited, but I have a multimeter I can use to run tests if needed.

Thank you!

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

Anyone?

[jjanssen7]

Re: What is causing new TV T-CON board to fail?

In my experience your LCD panel is faulty. The work around is the "tape cutoff method" which may stabilize the screen.

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

In my experience your LCD panel is faulty. The work around is the "tape cutoff method" which may stabilize the screen.

Yes, I tried the tape cut off method back in January. The result isn't ideal, but it's better than having no TV haha!

So you believe the panel is what damaged the two T-CON boards? The issue is related to the same two clock pins on the brand new board, it can't be a coincidence.

[jjanssen7]

Re: What is causing new TV T-CON board to fail?

yes, all I've ever been able to do is the tape cutoff method in that situation, and I've done that with 50 or 60 of those Toshiba fire-wire tvs. Replacing the tconn never fixes the problem. I'm surprised it did in your case!

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

Ugh, that's not a good news!

Does using the tape cut off method fully fix the image for you (e.g. like a brand new TV)? In my case, black horizontal lines show up every two seconds on the left side of the screen. This side also darkens a little when the lines show up.

I attached two close up images of the screen with the same background. The first one was when the image appeared correctly. The second was taken two seconds after when black lines appeared.

[jjanssen7]

Re: What is causing new TV T-CON board to fail?

typically when I find black bars on the screen are from when the driver IC's have failed... no fix that I've ever seen. tape cutoff method only fixes the 2 second "jump", not black bars.

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

I see. Thank you for your help, I will start shopping for a new TV!

[Diah]

Re: What is causing new TV T-CON board to fail?

its not bad panel.. the prime reason are the set design, they used principle from each country song. so.. you never uploaded any photo on yours whole back tv and the t-con self. to let us see if it protected with shield or nor not and which kind of shield if there are... high frequencies of LVDS signal and filter parts on T-CON and low one too easily effected by magnetic field which considered by reducing this damage effect by shield over the t-CON.

if yours place are under high level of such environment effect will add more reasons to damage those filters.

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

its not bad panel.. the prime reason are the set design, they used principle from each country song. so.. you never uploaded any photo on yours whole back tv and the t-con self. to let us see if it protected with shield or nor not and which kind of shield if there are... high frequencies of LVDS signal and filter parts on T-CON and low one too easily effected by magnetic field which considered by reducing this damage effect by shield over the t-CON.

if yours place are under high level of such environment effect will add more reasons to damage those filters.

Here is a picture of the original T-CON board posted in the January thread. The new one looks exactly the same.

I can take more photos of the whole back TV tonight. Would it be useful to take close up photos of each board as well?

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

Here are more photos of the back of the TV.

I also took close up shots of each board and tried making a collage of the bottom part where the brown LCD cables are connected.

[jjanssen7]

Re: What is causing new TV T-CON board to fail?

I'm out. I guess repairing 50-60 of this specific model isn't enough...

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

I'm out. I guess repairing 50-60 of this specific model isn't enough...

Thank you for your help, I truly appreciate it and trust your competences. My previous replies were intended for Diah, just in case he/she has a solution.

[Diah]

Re: What is causing new TV T-CON board to fail?

i never saw yours set before. but i answered the questions of yours threat title (What is causing new TV T-CON board to fail?)

yours photo https://www.badcaps.net/forum/attach...6&d=1617660273 approve to my answer... yours set had no metal shield to protect the T-CON, however the chassis had the central point where the shield should be screwed.

so my answer at post #9 in place its not bad panel.. you need working T-CON and placing metal shield on it so it will work as it should for long time. also you need to consider if yours house / room under any external magnetic environment.

my suggest to any one need to search and read how metal shield protect t-CON or other frequencies video based parts.. as its big subject.

[Diah]

Re: What is causing new TV T-CON board to fail?

there are early study on the effect of Electromagnetic interference "EMI" on the SPI FLASH. at yours case we can see the first T-CON was build with SPI Flash from MXIC (MX25l006E) and the one you replaced early had the SPI from "Winbond" (W25X10CLING)
from my experiences we did found winbond brand failed at many Others include TVs devices also beside the subject of protecting against EMI there are another solution could help with low cost to replace only the SPI U402, solder it out dump it with CH341A programmer and flash new IC.

[nomoresonys]

Re: What is causing new TV T-CON board to fail?

Interesting thread, Diah do you think it just needs a metal shield or has something been damaged?

[nomoresonys]

Re: What is causing new TV T-CON board to fail?

Curious to see if that solution would work, you can get those CH341A for a few bucks on ebay, are you up to the task Lisanimaux?

[Diah]

Re: What is causing new TV T-CON board to fail?

Interesting thread, Diah do you think it just needs a metal shield or has something been damaged?

there are damage now as i think 90% the SPI and the rest could be one Filter L get inside crack , metal shield are protecting step after repair to avoid didn't happened again or at least will keep it working for long period of time. in case the users around environment didn't caused this EMI.

[Lisanimaux]

Re: What is causing new TV T-CON board to fail?

there are early study on the effect of Electromagnetic interference "EMI" on the SPI FLASH. at yours case we can see the first T-CON was build with SPI Flash from MXIC (MX25l006E) and the one you replaced early had the SPI from "Winbond" (W25X10CLING)
from my experiences we did found winbond brand failed at many Others include TVs devices also beside the subject of protecting against EMI there are another solution could help with low cost to replace only the SPI U402, solder it out dump it with CH341A programmer and flash new IC.

Thank you, I will read more about EMI!

I've never soldered before, but a friend could help me with that.

As for the metal shield, is one type of metal better than others? Would galvanized steel work?