lcd panel destroys t-con price

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.

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 used to repair television sets, not just replacing circuit boards, I am talking about troubleshooting down to the component level and replacing the bad parts. Problem is, with the cost of the new television sets being so low, and with the cost of technical labor being what it is, repairing television sets these days is usually not economically practical. Also, many of the components (microprocessors and other flat pack IC"s) require special de-soldering and soldering equipment which makes it difficult, if not impossible, for the DIY people to try and make the repair. To replace the whole circuit board most times is not a viable option due to the high cost and to replace the LCD screen is usually more expensive than what the whole television cost.

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LCD televisions can be quickly destroyed by water. Contact with water is one of the worst things that can happen to an electronic device, such as an LCD television. The water causes the metal pathways in the circuit board to short circuit and corrode, making the board useless.

Water damage can ruin an LCD computer screen or any LCD display. If you have water visible in the display or even a hint of suspicion that water has breached your screen, take action immediately. Leaving moisture unattended will surely cause permanent damage.

Second: If your flat-screen TV has the dreaded vertical lines, half of the screen has turned darker, the screen is cracked, or the screen is broken, this can be repaired but may cost more than you paid for the complete TV. If your screen is cracked or broken, you can try replacing the screen, LCD, Plasma, or LED part.

Vertical lines on a TV appear for the same reasons as horizontal lines: loose cables and wires, screen damage, or a faulty T-Con board. Leaving the TV turned on for too long can also cause vertical lines.

What you"re describing is high probability to be either a video processor or switcher IC fault (mainboard) or a T-con board (usually attached directly to the panel, between the panel and the LVDS cable to the mainboard). The T-Con and the panel are USUALLY sold as a matched pair; as in the T-Con is designed and firmware-specific to the particular panel. In many cases, even different product runs of the same panel will require a differently calibrated T-Con.

Fortunately, as the T-con is produced this way, you MAY be able to find a generic part by the LG Part no that will work most of the time but may have inaccurate color reproduction; in many cases these are pretty cheap and well-worth taking a gamble on resurrecting your screen.

Some screens may have an LED Driver between the mainboard and T-Con; this processes the LVDS signal to control the LED backlighting zones for dynamic contrast. It is usually a go/no-go part, but can kill all picture to the screen as well.

[EDIT] Almost 100% certain now; dead T-Con board. You"ll want to check the power rails to the T-Con and make sure they"re within spec before you change it. If you can find one. [/EDIT]

Here are 3 photos, not of the actual monitor but of one that I found a link to on the web, but mine is identical to this, the first one is of the thing with the back removed and shows the LVDS board at the bottom, the inverter for the screen lighting to the left and at the top under the cover is the T-Con board, the only other board that I can see in the bottom left corner (on the bottom) and holds the on/off switch and brightness up/down buttons all of which is working OK. I cannot see any other boards or leads disappearing off anywhere other then the 2 ribbon cables leaving the T-Con board and presumedly connecting to the screen?

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Since 1997, US courts have divided price fixing into two categories: vertical and horizontal maximum price fixing.State Oil Co. v. Khan,US Supreme Court held that vertical price fixing is no longer considered a per se violation of the Sherman Act, but horizontal price fixing is still considered a breach of the Sherman Act. Also in 2008, the defendants of United States v LG Display Co., United States v. Chunghwa Picture Tubes, and United States v. Sharp Corporation, heard in the Northern District of California, agreed to pay a total sum of $585 million to settle their prosecutions for conspiring to fix prices of liquid crystal display panels. That was the second largest amount awarded under the Sherman Act in history.

In 2008 in the US, LG Display Co., Chunghwa Picture Tubes and Sharp Corp., agreed to plead guilty and pay $585 million in criminal finesliquid crystal display panels.

In 2010, the EU fined LG Display €215 million for its part in the LCD price fixing scheme.Chimei Innolux, AU Optronics, Chunghwa Picture Tubes Ltd., and HannStar Display Corp.