Saturday, 7 November 2015

LCD TV T-CON BOARD TROUBLESHOOTING - NO VIDEO – VERTICAL LINES – VERTICAL BARS – WHITE SCREENS – HALF OF THE SCREEN BLACK – HALF OF THE SCREEN LINE – BLACK PATCHES ON LCD SCREEN

LCD TV T-CON BOARD TROUBLESHOOTING 


SYMPTOM  

NO VIDEOVERTICAL LINESVERTICAL THICK BARS – SCREEN IS WHITE – HALF OF THE SCREEN BLACKHALF OF THE SCREEN HAS LINEBLACK PATCHES ON LCD SCREEN 

Video Process defect


Video signals received by the video process circuits are handled on a frame-by-frame basis. It I almost impossible for the video process circuits to cause a symptom on a specific area of the screen. Failures on the video process board usually presents themselves as distortions, color level shifts, video level shifts or noise that affects the entire picture. The TCON can develop symptoms that seem to be video process related but the video process circuits will not provide symptoms that would be mistaken for a failed TCON circuit.

LVDS cable defect

Although problems with the LVDS cable or connectors can cause symptoms that resemble TCON failures, they usually tends to be intermittent and wiggling of the connectors will likely cause a change in the symptom on the screen.



LCD Panel defect


At times, symptoms of a defective panel may be mistakenly identified as a TCON failure. Beside a broken LCD glass, most panel symptom would appear in a particular section of the screen. The TCON provides pixel data to groups of row and column drive ICs located on the upper and side edges of the panel. It is improbable that several of these ICs would fail at the same time. Therefore many columns or rows of pixels that are on or off point to a defective TCON. A single row of On or Off pixels cannot be attributed to the TCON. The TCON simply cannot cut out a single line of information

TCON defect



A failed TCON circuit can produce a symptom of no video or lines and patterns that usually occupy a sizeable portion of the screen. A “no video” condition caused by the TCON is a bit harder to determine since there are no indications on the screen to analyze.
TCON defect



A failed TCON circuit can produce a symptom of no video or lines and patterns that usually occupy a sizeable portion of the screen. A “no video” condition caused by the TCON is a bit harder to determine since there are no indications on the screen to analyze.

Troubleshooting a dead TCON board

When the TCON board completely fails, data communication data between IC and the TCON IC will come to an end. The television will shut down and the power LED will blink , indicating the failure of the TCON. When there is no error code, the usual approach is for the technician to replace the A-board. Once it is determined that the A board is not the fix, one can conclude with a degree of certainty that the problem is the TCON board.

Avoiding wrong board replacement

One way to determine the location of the fault is to loosen the LVDS connector at the TCON board while the unit is turned on. Unlock the connector and gently rock the cable in and out of the socket while observing the screen for any sign of noise. The response may be gentle white flashes, intermittent colored lines, or a screen full of random patterns. A TCON board that has completely failed will not generate any type of symptom on the screen. Another method to rapidly diagnose the TCON is to apply heat and/or cool with hot air devices or circuit coolant and watch for random noise to appear on the screen.



8 comments:

  1. I am having trouble with a LG Tv model 42lc55 and i thought this might have been the same but i am glad i checked because now i know it is something else so it has saved me a lot of time so thanks.

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  2. Replies
    1. I have added lots of information in this blog. Its all what i have.Hope I will be able to add more articles like this. Kindly Check updates if you wish to have more information. Also surf the blog there are some more article like this. Thanks for the appreciation.

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    2. I have a LG50PK350 which is powering up as soon as I plug it in and it clicks on plug in as well th I heard a crackling noise so pulled the plug straight away and I found the problem part removed it and replaced it.now I have noticed a little green led flashing on the T-con board so do you know what I can do.is that light telling me that I have a problem if so how do I find out about the flashing codes or whatever.im just going to troubleshoot my LG T-con now or should I sort the flashing light first.??Thanks

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    3. LG50PK350 is a plasma TV. So there ould be no TCON board. Tcon boards aer use in LCD and LED tvs.

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  3. Hi i am glad that there is Diagrams because they say it all if i was just reading it i would still be wondering what to try first but with those it all becomes clear where to start.I have Samsung UE42F5000 and i have replaced the screen after it got not smashed but the cracks like Web well instead of Binning it i tried fix i got screen on and got it running the picture and sound are better than my bought one but i can not get internet i get connected that is what TV says on screen so i asked about it and they said i need to replace main board plus couple said T-Con board and i have just seen that it can not be T board but i put the screen and T Con board from a 40" older Samsung that in bits i am glad i seen this cos i just gonna leave it how it is everything works good t is just that connection that was puzzling me so thanks.Sorry about going on, got carried away.

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    Replies
    1. The old tv Boards wouldn't have the smart tv options in it. Even if try to update the firmware it wouldn't work Because of the missing hardware in that old board. Its better to keep it as it is if its working well except the Internet option.

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