HOW TO REPLACE A FAULTY T'CON BOARD TO LCD TELEVISIONS

 

Part -1

     What is T'Con board.  This is the board that controls the pixels in an LCD television.  It is connected between main digital board, and LCD panel.  Fault to this board is a common problem to all brands of LCD TVs. For a Sony KDL52XBR5, if its stand by light blinks 5 times, then a pause, again blinks 5 times, means T'Con error.  The T'Con board is attached to the LCD panel and is included with a  new LCD panel along with the inverter board.  The first check to do is, check the connections of flat cables to them. See the picture of some of flat cables connected to T'Con board.

How to make sure that the T'Con board is faulty.  So many strange screens will be displayed, if T'Con board is faulty.  Here are pictures of some of them.

Magic How to Remove LCD Screen Lines 

In most cases TV may show other symptoms too. If T'Con boards' processor IC gets direct shorted, it will apply a more load to TVs power supply section, and in some sets the technician might go before it. Check all the connections to both end of each ribbon cable connected to this board.  Normally, these boards are not repairable, except for some capacitors or SMD type fuses can.  How a T'Con board look like.  This is the picture of a typical T'Con board.  The shape and appearance to this board may differ to different TVs.

For Sony KDL32BX300, six blinks, pause, six blinks indicates a back light error and location is on the LCD panel. Not with T'Con board. The LCD panel includes the "Inverter MT board" and T'Con control MT board.    So different brands of televisions will show different blinking codes.  The technician must fully aware of these blinking codes. 

 Contd:

HOW TO REPLACE FAULTY T'CON BOARD

Part-2

     Normally T'Con board can be located fitted with LCD panel, either horizontally or vertically.  In most sets, it will be shielded withe a metal case, screwed upon it, which acts as an electrostatic shield, as well as a heat sink to main processor IC.  Upon unscrewing out the metal shield, the T'Con board is exposed, secured by screwing it on to the chassis.
  
See the normal position to a T'Con board:

     After locating the T'Con board, carefully check it for any capacitor fault or any on board surface mounted fuse blown up.  Refer the schematic diagram of the Tv under service for details.  If found any, replace them and try once more by connecting it.  Be careful when unplugging the flat cable connections to this board.  Look for any lock, if any, at the side of each connecting sockets.  If there is such locks, pull out the strip wires only after releasing them.  See a typical connection.

     Be very patient, and concentrate only to work you are doing.  Never handle board or wire with careless.  As you can see, no ICs on it can be replaced by normal soldering techniques.  The board  has been manufactured by automatic PPS; [Pick Place and Solder], machines controlled by computer and robotic hands.   Before unscrew the board out from chassis, just unplug all the flat cable connections, and reinsert them as it was.  Check once more by switch ON the set, after all connection has been done properly.  

Keep all the wire dressings same as before. If you have damaged any strip wires that connected with, not use it any more.  Buy new ones' of same connection numbers and dimensions.  These flat cables can be bought from most of the electronic spare part selling shops. 

 

     In rare cases, there might be some alignment be done after this board replacement.  To do it, you have to enter the service mode option to your set.  If you are not sound in electronics, seek tech support.  Never enter to service mode option, and change data values there, without proper knowledge.  it might make the set irresponsible to any further commands.