REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday, 25 February 2019

HOW AN LCD PANEL WORKS BASIC DISPLAY THEORY

HOW AN LCD PANEL WORKS



      After turning ON the power switch, power board sends (5V) standby supply voltage to microprocessor IC waiting for ON signal from keyboard or from the remote control.    When an ON signal either from keyboard or remote control is detected, microcontroller will send On control signals to Power board.  Then Power board sends [5Vsc, 12Vsc, 24V and Rly On, Vs On] to PCBs working.  This time, VIF will send signals to display back light, OSD on the panel and start to search available signal sources.  If the audio signals input, them will be amplified by audio amplifier and transmitted to speaker.


     If some abnormal signals are detected, for example (over volts, over current, over temperature and under volts), the system will be shut down by Power Off.


LCD BASIC DISPLAY THEORY


     When an electrical field is applied to the Liquid Crystal {LC} planes, molecules re-align so that, they are parallel to the electrical field.  This electrical process is know as [Twisted Nematic Field Effect] or (TNFE).  In this alignment, polarized light is not twisted as it passes through the LC material.  If front polarizer is oriented perpendicular to rear polarizer, light will pass through the energized display but will be blocked by the rear polarizer.  An LCD in this form is acting as a light shutter.


     Displays with various characters are created by etching away the conductive surface that was originally deposited on the glass.   Etched areas becomes the displays' background; unetched areas become the displays character.