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TitleTcon Training
TagsElectrical Connector Power Supply Power Inverter Backlight Thin Film Transistor Liquid Crystal Display
File Size6.1 MB
Total Pages38
Table of Contents
                            2012 UNDERSTANDING LCD T-CONTRAINING PRESENTATION
	Table Of Contents
	1) T-CON COVERED BY A HEAT SINK SHIELD
		The T-CON Shield Examples
		T-CON Shield Purpose and Key Points
	2) WHAT IS A T-CON?
		What is the T-CON Function?
	3) WHAT VOLTAGE SOURCE DOES THE T-CON USE?
		Understanding the Voltage Source for the T-CON .
	4) WHAT VOLTAGE DOES THE T-CON GENERATE?
		Understanding the Voltages that the T-CON Generates.
	5) WHAT IS AN LVDS CABLE?
		Understanding the LVDS Cable.
		Understanding the LVDS Cable.
		Types of LVDS Cable Connectors
		Example of LVDS Connector Contents
	6) DIFFERENCE BETWEEN A T-CON AND A 3D T-CON?
		Differences between a T-CON and a 3D FRC T-CON
		Differences between a T-CON and a 3D FRC T-CON
	7) HOW TO TROUBLESHOOT A T-CON ?
		Troubleshooting a No Picture problem.
		Troubleshooting a No Picture problem, checking Power Supply voltages.
		No Picture problem, Checking the T-CON’s Voltage  from the Main board 1 of 2
		No Picture problem, Checking the T-CON’s Voltage  from the Main board 2 of 2
		No Picture problem, Checking the T-CON’s Voltage
		No Picture problem, Checking the T-CON’s DC to DC Converter
		No Picture problem, Checking the T-CON’s DC to DC Converter
		Checking a 3D FRC T-CON’s DC to DC Converter
		No Picture problem, Running the Panel Test 1 of 2
		T-CON (TFT Drive) Board Panel Test 2 of 2
	8) P-DIM ROUTED THROUGH THE T-CON
		Some T-CONs Deliver P-DIM (Dimming Signals) to the Inverter
		Example of P-DIM Routed Through the T-CON
		Troubleshooting the P-DIM Line when Routed Through the T-CON
		47LG90 Backlight Dimming Control Through T-CON
	9) THE PURPOSE OF THE BRIGHT BLUE LED ON SOME T-CONs
		The Function of the Blue LED on Some T-CON Boards.
	End of  the T-CON Troubleshooting Presentation
                        
Document Text Contents
Page 1

2012 UNDERSTANDING LCD T CON
LG No.1

2012 UNDERSTANDING LCD T-CON
TRAINING PRESENTATION

Published March 1st, 2012
Updated April 20th, 2012

Page 2

Table Of Contents

1) The T-CON Heat Sink Shield [Pg 3]1) The T CON Heat Sink Shield. [Pg 3]

2) What is a T-CON, (TFT Controller)? [Pg 6]

3) What Voltage source does the T-CON use? [Pg 8]

4) What Voltages does the T-CON generate? [Pg 10]

5) What is an LVDS Cable (Low Voltage Differential Signal)? [Pg 12]

6) What is the Difference between a T CON and a 3D FRC T CON? [Pg 17]6) What is the Difference between a T-CON and a 3D FRC T-CON? [Pg 17]

7) How to Troubleshoot a T-CON board. [Pg 20]

8) Some T-CONs Route the P-DIM (Dimming Signals) to the Inverter. [Pg 31]

9) What is the purpose of the Blue LED on some T-CONs? [Pg 36]

Be First, Do it Right, Work Smart! March 2012 LCD T-CON Troubleshooting2

) p p [ g ]

Page 19

Differences between a T-CON and a 3D FRC T-CON

This shows the location of the additional

P803 P804 P802 P101 n/c Example from LX6500, LX9500 series

Tru-Motion

circuitry on the 3D FRC T-CON.

FRC
The 12V is sent to the T-CON by two separate

connections. P802 and P803.

FPGA
Check pins
49 51 (12V)

P802

FPGA

P803

49~51 (12V)

TFT TFT Check pins
Driver Driver 1 or 2 (12V)

Troubleshooting is the same for this type of
T-CON. See troubleshooting section.

Be First, Do it Right, Work Smart! March 2012 LCD T-CON Troubleshooting19

P806 P805To the panel
FRC: Frame Rate Converter
FPGA: Field-programmable gate array

Page 20

7) HOW TO TROUBLESHOOT A T-CON ?

1) The T-CON Heat Sink Shield. [Pg 3]1) The T CON Heat Sink Shield. [Pg 3]

2) What is a T-CON, (TFT Controller)? [Pg 6]

3) What Voltage source does the T-CON use? [Pg 8]

4) What Voltages does the T-CON generate? [Pg 10]

5) What is an LVDS Cable (Low Voltage Differential Signal)? [Pg 12]

6) What is the Difference between a T CON and a 3D FRC T CON? [Pg 17]6) What is the Difference between a T-CON and a 3D FRC T-CON? [Pg 17]

7) How to Troubleshoot a T-CON board. [Pg 20]

8) Some T-CONs Route the P-DIM (Dimming Signals) to the Inverter. [Pg 31]

9) What is the purpose of the Blue LED on some T-CONs? [Pg 36]

Be First, Do it Right, Work Smart! March 2012 LCD T-CON Troubleshooting20

) p p [ g ]

Page 37

The Function of the Blue LED on Some T-CON Boards.
On some of the LCD T-CONs there is a bright Blue LED that turns on for a brief moment during turn on and then it shuts off.
These are only used in set with Florescent Bulbs as the Backlights. As in the example below (from 42LG60), it shows the Blue
LED is on the lower right hand sideLED is on the lower right hand side.
The purpose of LD1 is to help excite the Selenium gas in one of the backlight bulbs.
This helps the bulb to light when there’s little room light by pre-exciting the gas.
With little room light, the gas in the florescent Bulbs tends to lie dormant,
(Little movement). This LED help to get the Electrons moving just before the point
of firing, (turning on). You may note the hole in the board just above LD1. There isg ( g ) y j
A small hole under LD1 too. This is how the light goes through the board to get to the
Bulbs. (There is a hole in the back metal cover of the panel as well).

LD1
Blue LED

Noticing that the g
LED lights and then
goes off is a good
indication that the
12V to the T-CON
has arrived

Be First, Do it Right, Work Smart! March 2012 LCD T-CON Troubleshooting37

has arrived.

Page 38

End of the T-CON Troubleshooting Presentation

This concludes the Presentation

Thank You.

Be First, Do it Right, Work Smart! March 2012 LCD T-CON Troubleshooting38

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