lcd panel destroys t-con manufacturer

If it was the lcd display, the lines would still be present regardless of the tcon i suppose. if it is a voltage issue blowing the tcon, the display is just a feedback loop through tcon to main board as opposed to the main board being the output to the tcon. is my thinking in the ball park on this?

So this image is from the new board ordered, after power cycling a few times while getting readings. it would turn on and then shut itself down. like the original board, now the tv stays powered on with the lines. once i disconnect the tcon, the lines disappear and the tv stays powered on with backlight. Off of what you had posted in your reply @oldturkey03 , it appears that the driver boards are connected to the powerboard and the lcd panel. the tcon board is connected to the lcd panel and the main board. if the driver boards and tcon are connected on this unit, it is internal and through the lcd it appears. it looks weird haha. but to trouble shoot the driver boards, i have disconnected each side of the lcd boards one at a time and the the tv will go through post and shut down.

One of my business associate asked me whether I can analyse the Samsung LCD TV for him. The model is LA32A330JLX which is in the store room for quite some time as it is very dusty when I received it. He said it too expensive to repair so he just kept it for sentimental reason. When I switched it on, the LCD display has incorrect colour, noisy disturbances at black level and poor contrast picture as shown below.

This type of defects normally caused by the main or the T-Con board .  From the TV channel display, it is unlikely that the main board failure as it is impossible for the video processing circuits in the main board to display a problem on a specific area of the screen. Failure of the main board or video circuit normally appear noisy or distortion of colours across the whole screen.

Most likely the T-con board BN81-01868A (V315B1) is creating the problem. It cost around US$60 including postage which is on the high side considering the age of this model. Changing the T-con board can be a very fast & easy repair job but it is not cost effective or may not worthwhile to repair it. A better solution will be to try to trouble shoot the T-con board, since it may not be big problem as the major function i.e the timing controller is working fine or else the TV channel will not be able to display normal picture except with the problems mentioned earlier.

The analogue grey scale signal is apply to the LCD TV AV input and the screen display turned out to be abnormal grey scale image (see photo 1). From the abnormality and discoloration of the grey scale display, it is confirmed that the gamma correction or generator IC is no longer operating normal and not performing gamma correction with the original characteristic. The gamma correction IC could be damaged or deteriorated which resulted in tinted colour and noise generated being superimposed on the dark or grey level.

Most LCD TV manufacturers do not provide schematics for T-con board and there are limited information on the internet. Spotting the gamma correction IC is not a problem as there are only a few IC’s on the board. The gamma correction or generator IC on this T-CON board  is labelled as U6 with marking “ AS15-G” and it cost only around US$4.

Superimposed picture might be a bad tab bond, or might be a bad connection on the timing controller. I"d take the TV apart, enough to expose the timing controller and ribbon cables going from it to the panel. Run it with the back off (keep hands free of backlight inverters and the AC power supply) and start pushing on things. When you can make the image change by pushing on something, you"ve found your culprit.

One thing I did figure out is that if I have right LCD ribbon disconnected and left connected that half the screen works (no lines) and the other half turns white, and the VREF light on the tcon board comes back on. OTOH if I have left LCD ribbon disconnected and right connected it is backlight and black and no picture on either side.

I read another post in here last night about a similar issue and the response was a brief "panel problem". Does anyone have more information about common problems in that area or how I might diagnose or repair the board going into the LCD (that is, the board that takes the LCD ribbon, I don"t know its name). It doesn"t look like something I can just order.

I noticed that there are some capacitors on the LCD-connecting board (do not know how to name it), that are connected to GND on both ends (marked red). This looks suspicious to me.

I tried on the tcon side as well and noticed that I have good voltages there when I disconnect the panel, but when I connect it again, I will not see any voltages there.

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3) Lastly I"m not going to go chasing it buying all the boards eg main etc, but I am thinking TCON at least, possibly main, but is there a good chance I"ve also blown that driver board, the one I mentioned, and I don"t think that one can be replaced anyway, also is there a good chance that the panel was already the issue right from the start, hope you"ll reply, Thanks.

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"New Samsung 3.9mm LED TV Panel Is World"s Thinnest". I4U. 28 October 2009. Archived from the original on 28 January 2011. Retrieved 16 November 2010.

"SMD Enjoys Soaring Demand for AMOLED Panel". Maeil Business Newspaper. 1 July 2010. Archived from the original on 21 January 2012. Retrieved 26 November 2010.

Drew Guarini (29 July 2013). "Exploding Samsung Galaxy S4 Allegedly Starts Fire, Destroys House". HuffPost. Archived from the original on 25 January 2014. Retrieved 5 January 2014.