Common LCD TV features

* HD (High Definition TV)
* HDMI (High Definition Multimedia Interface)
* VGA port
* SCART (21-pin port)
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What Determines What LCD TV to Buy?

What determines the LCD TV you choose to buy? What should you look for in an LCD TV? I stated earlier in one of my first posts that LCD panels are generally the most expensive parts of LCD TVs, and the most susceptible to damage. So if you're concerned about spending too much on TVs, I suggest you have these tips in mind: First and most important - What LCD panel is usually found in a particular TV model..............

Below is a list of common LCD panel makes/brands:

* Chimei Optronics (CMO)

*  AU Optronics (AUO)

*  LG.Philips

*  LG

*  Samsung

*  Quanta Display Inc. (QDI)

*  Sharp

Also, below is a list of LCD panel models and compatible T-CON, showing also their VCC rating:

NOTE: T-CONs are generally made to accept either 5 or 12Volts VCC.

*   Troublesome screen: Samsung,  32….  T-CON: 324046WHC6L V2.2

*  CMO, V260B1 –L03  Rev. C2

* LG.Philips, LC171W03 (C4)

* Samsung, LPA320AP02

*  LG, LC420WUH-SCM1;  T-CON: LC420WUN-SCA1

*  AU Optronics, T260XW03 V.3

*  AU Optronics, T260XW02 V.1

*  AU Optronics, T370XW02 VC;  T-CON:  12V

*  Samsung, LTF320AA01

* CMO, T-CON: V270B1-L01-C

* CMO, T-CON: V320B1-L01-C,

* Samsung, LTF220MT05; T-CON attached: LTF220MT05S2LV0.3_HF

* Samsung , LTA400HTSL4L V0.3

* CMO,  ; T-CON: V260B1-C0

* LG.Philips, LC420W02

* QDI,

*  AOU, T370XW01  V0-V2

* QDI,

*  BEO

* LG, LC220WXE, T-CON attached-5Volts

* T315XW01_V5/T260XW02_v2;  5Volts

* 320WTS2L2.7

* Sony TV KLV-32S310A  uses Samsung, 320WTS2L2.7 T-CON: 320WTC2L V3.7

* Sharp, LK420D3LA43; T-CON: CPWBX  RUNTK 4323TP

Note: I am still gathering information to post and update. I will be better. If you have read this post, please drop a comment to urge me on.

Why Get LCD TV?

Whereas in developed countries, LCD TVs are so common that you'll likely find them in most households, in certain other parts of the world, they are still very much a novelty. In these parts of the world (like some places in West Africa), people are usually afraid of buying these appliances because they wonder: "If it develops a fault, who's gonna fix it?" But there's good news! Electronics technicians have been keeping abreast with new display technologies even before they started getting common. That's the trend. So, your neighbors generally can find a solution to their faulty LCD TVs.

Terminology Explained

Flex: Also called zebra strip, flex is a flexible strip of silicon or rubber material with embedded thin strips of wires that conduct electricity. It comes in a number of colors like white, orange, brown etc. Here is a picture of a typical flex cable:

                                                   

                       This is one of a pair of zebra strips form a Samsung LCD module (400WTSR4LV0.0)


Pixel: Pixel is derived from the amalgamation of two words, Picture and Element. It refers to one of the thousands of little dots that form the display or graphics on the LCD panel.




Flip-Chip: This is a flexible circuitry usually carrying a chip which is the the pixel driver. Flip-chips that control vertical pixels usually have one end attached to the LCD glass while the other end is attached to the slim PCB that is part and on top of the LCD panel. But some flip-chips that control horizontal pixels have only one attachable end, and attach only to the LCD glass. Below are photos of what I am trying to describe.

                                                      
                                                       A Flip-Chip Attached to a slim PCB
                                         (Underside shown; the black, rectangular part is the chip)

                                      
                                                             The top part of a Flip-Chip

There can be as many as 12 vertical- and 4 horizontal-pixel flip-chips controlling an LCD panel's picture elements. Now in  some LCD panels, one (or two in the case of larger panels like 40" or more) among these flip-chips is probably most vital because it serves as a passage of energy for the horizontal-pixel flip-chips. Pictures of all this I will show as time progresses.

Common LCD panel faults

I thought you would be interested in getting familiar with most of the common faults exhibited by LCD TVs and monitors, and how they are sometimes described. You have probably seen some of them before. I plan to illustrate  these faults by use of pictures.

 Common faults:

* Horizontal bar

* Vertical bar

* Vertical line(s)

* Horizontal line(s)

* White screen

* Grey/Black screen (No display)

* Rainbow display

* No backlight

* Terrible Motion Blurr, etc

However, there is an important question begging for answers. Knowing the answers can help a great deal in understanding why certain faults seem to be common. The question is: why are LCD panels so prone to faults? This is one question I promise to address sooner or later...

If you have been visiting this blog and are interested in the subjects covered, you may add your comments, or you can ask questions if you have any and I will try my best to respond as soon as I can. All the best!

What to expect

I thought that I should wet your appetite further by letting you know what i'll be writing on (ie what to expect to learn from this blog).

Apart from what I have already written on, which is like an introduction to the LCD technology, you can hope to learn about the following:

* Different terminologies used in field of Optoelectronics

* Why LCD panels seem to be more prone to developing faults

* The various problems/faults common to LCD displays, and how to correct them

* Common LCD panel models and the T-CONs they use
* Perfect picture settings

** Solder application substitute to electrically conductive adhesive in LCD panel rework.

You notice here that I have two asterisk on the last item listed, solder application substitute to electrically conductive adhesive. This should be be particularly interesting to you. I think so because as far as I know, repairing LCD panels demands that you have the conductive adhesive I mentioned. But these things can be very expensive. Aside from that, they are not yet widely available. So you think of a possible substitute...More on this Later.

Terminology

There are certain terms relating to the Liquid Crystal Display technology that must be explained in order for their problems to be understood (up to their root causes) and then repairs can be more readily carried out.

Terminology:

*Flex

*Electrically conductive adhesive (ECA)

*LCD panel/module

*LCD glass

*Polarizer

*PCB (Printed Circuit Board, or Board for short)

* Source PCB, Gate PCB

*Joint (flex-to-PCB joint and flex-to-glass joint)
*Pixel (row and column pixels)
*T-CON
* Flip-chip

     I am going to be explaining all the above-listed terms through a stretch of time. So please check back as soon as you can for additional updates.

Practical Solutions to LCD TV Display Problems

                     LCD TV AND MONITOR DISPLAY PROBLEMS

Note:

Did you know that the LCD panel of an LCD TV is often as expensive as the entire unit itself? What this means is that if your LCD TV has a faulty display, you probably would want to repair it yourself by all means. In fact, making money from repairing LCD panels could actually fetch you NOT a few dozens of dollars a day if you knew how to troubleshoot them. And the good news is troubleshooting LCD modules is relatively REALLY easy because there is usually smaller circuitry on the modules. To be fair, some display faults you see may be caused by a faulty power module or a faulty main board. So it would help to make sure that a display problem originates from the LCD panel, so that you do not spend time on the LCD panel in vain. A lot of care has been taken to ensure that this information is presented in a clear and concise way so that even those with little or no knowledge of electronics may readily understand. However, attempting to carry out repairs on any LCD panel following the directions in this guide is an action you are solely responsible for. The author of this guide will not be held responsible for any damages that result from such actions.  that being the case though, I can confidently say that you will find this guide to be very helpful.






Before I go into much of the repair details I would like to present some preliminary information on the subject of this blog: LCD.


Liquid Crystal Display (LCD) is a display technology that has been in use for decades now. You can find it in mobile phones, TVs, digital wrist watches, computer monitors, Walkmans, in fact, in most digital electronics. However, the application of LCD technology especially in large-sized TVs is still a fairly recent development. Interestingly, watching your favorite shows, movies and other programs on an advanced LCD TV is really a great experience. Moreover, LCDs are common because they offer some real advantages over other display technologies; they are lighter and use up much less power than cathode ray tubes (CRTs), for example. 

  

Typical LCD TV

A digital wrist watch with an LCD screen

A mobile phone with a Liquid Crystal Display

I'm sorry I have not posted a lot of information since I started this blog, but I promise to upload most if not all of my knowledge (and challenges in this field) in a few months time; and on and on because as you know, there is no limit to electronics knowledge. I am a very busy person working in the LCD field of electronics so I urge readers of this blog to be patient with me. However, please check back as often as you can for I will continually update this blog. Many thanks for your patience.

Solutions to LCD TV and LCD Monitor Display Problems

Solutions to LCD TV and LCD monitor display problems REVEALED! This is from my time-tested methods which have been used to fix a good number of LCD panels. Please visit soon for the much needed information.