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Repair guides and support for televisions manufactured by Sony.

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Possible Dead T con board? or is it the Screen?

Hey Guys,

I have a KDL-46W5500 Sony Bravia which has just decided to turn on with lines appearing 10 seconds after power on

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After some investigation I decided to take the back off and try taking out / putting back in the T Con Board inputs and strips/connectors

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but to no avail.

I am considering purchasing a new one off Ebay for about $80, but wanted to know if any of you fine gentlemen could advise if you believe replacing the T con board would actually solve my problems or whether you believe it to be the LCD Screen itself.

I did try powering on the tv without the T con connected and the lines didn't appear so I think that is maybe a tick on the replace the t con board list. Any help would be much appreciated. other photos of tv components:

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Thanks,

Joel

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I guess its not the Tcon , but the main-board flash ic problem issue. check whether the 5.5 v mosfet is overheating by touching it.

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I have Sony Bravia LED 3D TV KDL 43W950D. Sl no. 8526842.

Few days before i,e. on 15/12/2020 in the morning when I was started my tv it was displayed white screen then blinking red 5 times and so on. I have informed to Sony Service station then service engineer came to me on18/12/2020 and open the back cover and clean the dust then tv was o.k. I have given him Rs.1300.00 as a service charge. Next day morning same problem appeared. Again service engineer come to me and open the back cover and done something again tv was restored. Next day again same problem appeared he came to me and put software for update then tv was restored and he told me it was a problem of Tcon board but Sony does not supply only tcon board so I have to purchase full panel and it will cost more then 17 thousand. Next day morning same problem persist. why he try to replaced my tv parts instead of minor repairing? Let me know what is the actual problems.

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@samir kumar mukherjee, do you know where can we get a full panel?

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Hey I probably should have posted earlier. Replaced the main board and after that didn't work, I figured it was the panel and just sucked it up and bought a new TV.

Good news is now I have 2 main boards that I don't need...

Thanks for all the help from the people on this board, I really appreciated it.

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LG 50” lcd tv has no sound or video. The screen flashes once briefly then stays black... I’ve replaced a main board and there’s no sign of damage on the power supply. Could it be the t con? I am not so sure considering there’s no sound. Any ideas?

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46 inch LG, same issues. Tcon replacement fixed it. Electro Parts Online.

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In most cases it is neither the panel, nor the T-CON board. It is most likely bad contact of the FPC cables. There's an oxide layer forming on the FPC pads. So even reseating/wiggling them may not fix it and it gives a false impression. Please look for my post below

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@joel_h this does not look like a typical T-con board error. This appears more of a video processor error and could originate on your main board. Check that board and see if you notice any obvious damage and check all your cables to ensure they are not tore and are properly seated. After that I'd start by replacing the main board (get it from a place where you can return it in case it is not the fault)

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Thanks OldTurkey,

I'll check back in once I have had a look at the main board.

Cheers,

Joel

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So I have taken a look at the board (my extent of this is literally looking at it) and tried re-seating everything on it. issues is still persisting and I have no way of knowing what is causing the issue.

my only other information is that it appears I have horizontal lines as well as vertical lines, but I doubt this points to anything else?

Is there anything I can do to narrow down the culprit before changing out hardware? (I'm in Australia and anything I can source will not likely be returnable) Thanks again for your help mate.

Joel

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There is one point that has not come up before not is it visible on your pictures. " I have horizontal lines" is usually an indication that the panel as failed. Horizontal lines are never caused by a bad T-con board. Let me see if this is a common error for your model.

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what I meant by horizontal is that you can see black horizontal lines. (so the vertical lines aren't actually fully red, they have black lines in them. What I am talking about is visible in the pictures, so if you think I meant actual colored horizontal lines, that's not what I meant.) hopefully that makes sense.

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the only other thing I am worried about is that it might be the vertical bands. (the ribbon cable strips on the front of the TV) However, I haven't taken the metal exterior off to check these. Do you think this may be the cause?

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Tcon board is your best bet.

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If it recomends a specific model it will only work on that one. If it’s recommended for various models then you ca alternate. Sizes of screen will defer on boards to be used.

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It is not the panel, it's the 2 FPCs!

TLDR: Oxidized/bad contacts of the two flat flex cables from T-CON board to the LCD panel distribution board.

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I had the exact same issue and fixed it.

For me the issue started with static equally spaced horizontal lines every 6 pixels (this may not be the same for you). I didn't care much, because they were not noticable at normal distances. They were not completely black, but darker. So I lived with it.

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After 20 months, out of nothing suddenly also colored vertical lines appeared. Mostly red lines, but some few lines of other colors as well. The intensity varied depending on the displayed image, The lines were on both screen halves, left and right. After power on the lines faded in within 10 seconds. Powering off and on again gave the same observation. The lines, initially non-existent, were fading in slowly,

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Not knowing the cause I tried everything except replacing boards due to availability.

Things I've done without any effect:

  • Reseating and wiggling cables. I took out the 2 FPCs (which was the culprit not knowing at that time) multiple times and it did not change anything. So I searched on the T-CON board.
  • Heat gun on components
  • Freeze spray on components
  • Because of some 120Hz ripple on the 12V supply for the T-CON board I tried using an external power supply (it draws about 1.4A - 2A current)
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  • I reflow soldered the BGA components: 2x RAM chips, Sony and WISE-Processor, because I thought mechanical stress of the heatsinks could have broken some BGA contacts
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  • I even inspected the panel driver chips and panel substrate, despite it's obvious that it could not be the problem as the stripes were not limited to a specific section (column) of the screen.

3 days for nothing. I almost gave up.

I gave it a last try and when I tested the screen with only one of the FPCs seated, suddenly the lines were gone (the screen half of the connected FPC of course).

So I rubbed the FPC pads with antistatic clothing and isopropyl alcohol.

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(not the actual picture, because I forgot to take one)

Wipe these pads really good! 2 times is not enough! Do it for a minute or so and BAM:

No lines anymore!

I also cleaned the other one and this fixed the horizontal lines!

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Conclusion:

Check your FPCs first and clean them properly! Even if one is responsible for only one screen half it could influnce both halves!

Pressing the connector / cable, pushing, pulling, wiggling and reseating (multiple times) the cable did not make the slightest impression beeing the culprit.

I've also read that adding a stripe of scotch tape on the back of the cable (increases thickness) could improve the contact.

Also check the other end (panel distribution board). For that the screen must lay on it's back to prevent the display falling out.

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Albert - thank you for the info. I had the same TV and same issue, with the horizontal lines every so and so pixels and the coloured vertical lines that faded in and became more prominent as the TV warmed up and just spent a day trying to fix it. Unfortunately could not come to the same result.

Do you want me to salvage the boards for your future use as spare parts? The power supply and main board are in good shape, just seems to be somewhere between the TCON and the panel.

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I had trouble with Philips 58PUS7805/12 with no image. Backlight seem to work and one half of the screen at a time when only one of the cables connected to T-CON board. When switching to other connection the image was working on other side also.

I found from youtube video that it sometimes could be shorted capacitor somewhere that drags voltage of gate drivers off (VGH, VGL). In my case I suspected these as I measured both around 0 volts when both FPCs were connected.

Cleaned cables and connectors as per above instructions and it was not immediately working so tried to wiggle the cable a bit with the connector latch open and then closing the connector. That seems to have corrected the image.

Definitely seems some kind of connection issue on the flexible cables.

Thanks for the tip!

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