Lcd tv fault finding

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

Samsung LCD TV with no video and high pitched sound - Digital TV ...

www.tomsguide.com/forum/54120-4-samsung-video-high-pitched-sound

Jan 7, 2010 - 26 posts - ‎15 authors
Hi, I have a Samsung LN40A550 LCD TV which I have had for just over a year. ... I was watching TV yesterday and all of a sudden the picture went all. ... started makinga very high pitched buzzing sound with no picuture coming on. We did have a bunch of green vertical lines, but now just a black screen.

Samsung LCD Green Screen - Forums - CNET

www.cnet.com > Forums > Samsung

CNETJun 11, 2015 - TV hooked up to basic cable and getting green screen picture. ... I was getting green static in the dark areas and green fuzz down the left hand ... where can you find the white ribbion, i have a lg rt-32lz50. it works sometimes, but i goes green. Samsung LCD TV screen went black (audio on, no picture)
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www.badcaps.net > ... > Troubleshooting TVs and Video Sources

It sounds that the back-light CCFL lamp is faulty. It is time to replace it. When replacing, do it to all CCFLs, because, the life time to these lams are expiring now, as the set is nearly 4 years old. Check this link http://electronicshelponline.blogspot.com/ to get more details about how to replace the CCFLs. Pull up older posts there. Some among it have details.

t con board failed if its half and half. can also be a lose cable on the screen to the tcon board from the lcd screen side. Tcon is in the middle off the screen on the back.

the short answer is you need a new lcd screen

the long answer is you have a fault with your lcd screen and if you take it apart you will find what are known as tabs connecting the glass part of the screen to the controller boards by manipulating these tabs you can cure your lcd fault

( note to get this far i assume you know what your doing and have already stripped the unit down to leave just the screen and the boards to control it including taking off the metal rimband of the screen itself )

with the screen upside down and tabs facing you you should be able to turn the tv on and find out what tab is faulty by gently pressing on each tab untill the fault goes away once you see any kind of movement of the fault you have touched the correct tab ( usually the first tab on the left hand side of the tv as you look at it in its current service position ) or the right hand side of the screen if its standing upright on its base

there are many methods of lcd screen repair used at this point . some use hot glue guns to hold the tab in place some use super glue others use heat resistant pads that you will find in any tv repair shop usually attached to the back of a high heat board

the only way to 100% cure the tab is by computerised laser & microscope

but you can do a good job fixing your tab by just flying blind and making up the connection again

what you use to hold the tab in place is your choice just dont use anything that reacts with heat or is conductive and could cause a fire

good luck to you ...

please dont forget your other option is simply to replace the lcd screen

All these sets use two boards (most) inside----one drives the picture left side and the other right side----sounds like your problem.

Contact LG (you listed it here as the brand) to see if this is a known issue with your model and if even if out of warranty do something.

It does not hurt to ask.

no. there's some problem on its display circuits that it need to be corrected, picture becoming dark has some problem with the inverter power supply circuits that responsible for lighting the small lcd flourescent light. maybe some loose connection in the components cause that to happen

lg 42 in lcd tv power button blinks nine times before staying on and has sound but no picture

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size