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My LCD TV has developed about twenty different coloured lines down one side of the screen, can anybody tell me if I can fix this.

On the left hand side of the LCD screen there has appeared about twenty assorted coloured straight lines, culminating in like a digital crack at the very bottom of the screen. I am to say the least puzzled. Can anyone please help me.

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Sounds like the Tcon board is causing the lines which is very common issue when the Tcon fails. You can get the replacement Tcon form www.tvrepairworld.com

Posted on Apr 05, 2013

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6ya6ya
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SOURCE:

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Posted on Jan 02, 2017

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SOURCE: Sky PDS4250 42'' Plasma TV - Black line down centre of screen

not sure if this is the fix or not ...but i was tryin to fix a problem with my tv(not the same as yours)...but in the menu under adanced you can split the screen ....when i do that it puts a blue line down the middle of the screen

Posted on Dec 04, 2008

  • 1 Answer

SOURCE: LG flat panel plasma with red line

I had the same problem and fixed it by replacing the control board. It's a little nerve wracking, but required only simple hand tools. If you'd like to see detailed pictures of the repair check out my blog.

http://greenrenovation.wordpress.com/du-42px12xc-repair/

Posted on Feb 04, 2009

  • 98 Answers

SOURCE: Vertical lines in LCD tv screen

Need to check the two things.

1st -- need to exchange T-con Board.
2nd -- need to exchange the cables between T-con & LCD panel or
between T-con & Main(LVDS cable)

Posted on Feb 06, 2009

  • 1 Answer

SOURCE: Thin Red Line on LCD TV

I had a similar problem with my LCD screen TV, and to my dismay, my warranty just ran out. A thin red line began to appear on the right side of the screen, and since many online and expert sources pretty much say replace the expensive LCD screen or get a professional to fix it (in which I suspect to be a business plot to get people to go to pricey experts), I decided to look for other possible alternatives. 
Here is some tips/solutions I was given (and it worked! at least for me): 
1) Turn off the LCD and unplug the power source and let it rest for 5-10 minutes. Turn it back on and see if it disappears or improve. (This is the one I used.)
2) While turned off, try jiggling gently all chords connected to the TV (cables, power chords, etc.); you could even try unplugging and replugging the chords/cables. Turn the TV back on and see if the red line disappeared or improve. (This is the one I heard worked for others.)
If the above doesn't work then I'm afraid you do have a bad panel on your screen and will need to call in the experts or get a new TV. I hope this will help. Best Wishes. 

Posted on Jul 07, 2009

  • 1 Answer

SOURCE: I have an LG 42" LCD tv with blurred image on half the screen

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

Posted on Feb 05, 2010

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How do I fix my Samsung LN52A580 TV as the right half of the screen is totally black (even thought I get sound and picture on the left hand of the screen)?


Samsung HL-R6178W DLP TV half of screen goes black [Solved] - HDTV ...

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Jan 21, 2016 | Samsung LN52A580 52 in. HD-Ready LCD TV

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I have a 46" toshiba zf355. when i first turn on the tv i get vertical lines...


This is the basic guide that can be applied to most LCD flat panel TV.
By Bud Martin
First, try unplugging it from the outlet for about an hour to see if the TV will reset itself since the minute the TV is plugged into the wall, the power supply and processor will be running 24/7 and the EPROM can get corrupted by spikes and surges. Try using good quality surge suppressor to see if it will help if it happen often.
Look for burnt brown hot spots on the circuit boards, capacitors with leaking/bulging top or seals. Loose wires and connectors. Blown fuses.
Notes: We are dealing with high voltage that can kill you! so if you are not sure what you are doing, please have it fixed by the pro that has proper tools and safety equipment. Try to use GFI outlet and isolation transformer when work around the TV set and DO NOT DEFEAT THE GROUND PIN OF THE OUTLET/POWER CORD.

1) The power supply module (There are 4 regulated output voltages:- Standby 5vdc, switched 5vdc, 12~16vdc, and 24vdc).

The power supply converts the 120/230vac 50/60Hz into DC, then the high frequency (50~100kHz) switching circuits convert it back to AC but at high frequency which allows the power supply to use smaller and much lighter weight transformers (Ferrite core instead of heavy iron core), then this high frequency AC voltage is fed to the rectifier Diodes to get the DC output and filtered by DC filter capacitors that must have low ESR (Equivalent Series Resistance), if general purpose electrolytic caps are use, they will fail within a year or less due to high ESR.

The power supply has Standby 5vdc (5VSB, this is a MUST have before anything else will work, when this voltage is not present, there will be no any indicator light on the front panel) which is always on the minute the TV is plugged into the AC outlet, so it is on 24/7 and that is why the power supply will fail even though you may use the a TV not very often. It will see all the voltage spikes and surges 24/7.
This 5vdc is used to power the Processor and the Infrared remote receiver module which will be waiting for the command from the remote control or from the power switch, when the Power on command is received, the Processor will send the turn on signal (3.3~5vdc) to the power supply module (PSON pin) to the switch on the main 5vdc for the rest of the logic and Tuner circuits, 12~16vdc for the sound amplifiers (mostly Class D amplifier for efficiency and small size) and for the T-CON board (interface board between the LCD panel, some T-CON uses 5vdc, and the Logic board), and 24vdc for the Back lights inverter board (if there is no 24vdc then no back light).
Common failures:
Blown main AC fuse due to shorted out Diodes, transistors.
Bad capacitors leaking or bulging tops:
Shorted Diodes, transistors in the DC output side.

Testing the power supply output with dummy load:
24vdc testing: Disconnect the wires that go to the inverter board first. You can use two #1157 (using both Lo & Hi filaments by paralleling them at the base) car light bulbs connected in series so they can handle the 24vdc, this will put light load (about 70w) on the 24vdc output, the voltage out should be steady at 24vdc (+/-2v), if not, the power supply has regulation problem.
12vdc testing: disconnect the 12vdc TV load from the power supply board and attach one #1157 (using just the Hi filament), the 12vdc output should stay at 12v (+/-1v), if not, the power supply has regulation problem.

You should see the lamps go on when the TV power switch is ON and go OFF when the TV is powered OFF.

2) Main Logic board (It has Processor, Tuner, Sound Processor, Sources selector, Power amplifiers for speakers, interface port to the T-CON board for pictures).
This logic board sends out the turn on signals (3.3~5vdc) to turn on the rest of the Power supply module (Switched main 5vdc, 12~16vdc, and 24vdc), Inverter backlight ON (if no back light on command then there is no back lights),
Logic board supplies 5 or 12vdc to T-CON board B+ pin through switched transistor if T-CON board does not get the voltage from the logic board, you will get white/gray glowing screen without pictures.
Back lights Dimming (PWM) control signal.

3) Back lights Inverter board. Its job is to provide the drive voltage for the CCFL (Cold Cathode Fluorescent Lamp) to give white light for the screen.
This board is fed by the switched 24vdc (VBL) from the power supply module, it also get the Back lights on (BL on) control signal and the Dimming (Dim/PWM/) signal from the logic board. So for it to work, it needs 24vdc and the BL_ON signal.
Common failures:
Blown surface mounted fuses due to shorted transistors/ICs, Transformers.
Bad capacitors.

4) The T-CON (Timing Control or LCD controller) board (on the LCD panel assembly). It transfer the universal image signal of TTL and LVDS signal to specific TFT (Thin Film Transistor) LCD.
This is the interface board that talks to the Logic board and the LCD panel to produce pictures on the screen. White/gray glowing screen when it fails or not getting the voltage from the logic board (the 5 or 12vdc is supplied by switched transistor on the logic board). Notes: T-CON board is mounted under the metal cover shield.
Common failures:
Scrambled pictures, Lines, multiple pictures, color smears/blotches, rolling pictures after warm up.
Blown surface mounted fuse.
No pictures, very dark screen almost like there is no backlights.

5) LCD panel assembly to display pictures. The LCD pixels will block or unblock the back lights from the back of the panel to the front of the panel. This is the most expensive part of the TV, it will be more than the TV is worth.

As you can see, you must have all the above Voltages and signals for the TV to work properly. This may help you narrowing down the bad modules instead of buying the wrong module just to find out later that it did not solve the problem. Hope this will help you out.

Sound problem:
Let verify first to narrow down to where the problem can be. First, check the on screen sound set up menu to make sure the speakers are not set to OFF. If the setting is OK, then attach the powered PC speakers to the Audio Line out RCA jacks to see if you can get the sound there, if you do, then the problem can be in the power amp circuits, if you do not get the sound at RCA jacks, then the problem can be in the sound processor circuit. To get the sound repair, it can be from $150 and up, so if you can put up with using the good set of Powered PC speakers which actually give better sound than the tiny speakers inside the TV, I would keep using it that way, you may want to find out if the on screen sound setup will allow you to set the audio line out to be VARIABLE which means the sound output feeding the PC speakers can be varied using the TV remote control, then all you have to do is to set the PC volume to about half way up and set the TV volume to what ever you want.

Inverter board connector: you can also see the Fuse 4A/160V
http://i.fixya.nethttp://i.fixya.net13ca788.jpg
Power supply connector:
http://i.fixya.nethttp://i.fixya.net78e0d9a.jpg

http://i.fixya.nethttp://i.fixya.net2fc510f.jpg
T-CON board: (metal cover shielding is removed to show the bd.)
http://i.fixya.nethttp://i.fixya.net0b5367e.jpg
Inverter board:
http://i.fixya.nethttp://i.fixya.netaf0a695.jpg
Logic board:
http://i.fixya.nethttp://i.fixya.net4bd108e.jpg
T-CON board is dead, no power or blown fuse on the board, screen turns WHITE, must see it in darkened room, otherwise you may mistaken it for failed backlight.
http://i.fixya.nethttp://i.fixya.net3a91b68.jpg
Bad T-CON board after warm up, you get lines, multiple pictures, strange colors blotches, etc.
http://i.fixya.nethttp://i.fixya.netd3cf194.jpg
Bad caps (leaking/bulging tops). Make sure to replace bad cap with good cap such as PANASONIC FM or FC series , they are Low ESR (Equivalent Series Resistance) which is a must for switch mode power supply, and 105c rating. Do not use generic electrolytic caps.
http://en.wikipedia.org/wiki/Capacitor_plague

http://i.fixya.nethttp://i.fixya.netbe827ec.jpg
Bad T-CON board or power supply problem

http://i.fixya.nethttp://i.fixya.net034e1db.jpg

24vdc power supply output testing using two 12vdc car lamps in series.

http://i.fixya.nethttp://i.fixya.net4f2929c.jpg
Bad LCD panel, vertical 1~2 pixel wide lines
http://i.fixya.nethttp://i.fixya.net28e50c1.jpg
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm

Free service manuals: www.elektrotanya.com

on Jan 15, 2011 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

Bravia KDL46w5500. Why does it display vertical lines all over the screen?


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

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I have a toshiba 22 inch hd tv, when i go on my ps3 at the start screen there is a thin green line (or different colour line depending on the colour of my theme) down the right hand side of the screen. Any...


Hi,
Would like to tell you that there is nothing wrong with your PS3, but it's the T.V that is causing the problem.

Unfortuntely, the only thing that will cause a thin line or two is the lcd panel assembly. The cost to replace this would be really high so the best you can do is put up with it as long as you can, then replace the set.

Apologies on the bad news but i must be honest with you. I have seen this with all makes of both lcd and plasma tv's

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My samsung lcd tv is 18 months old and has now developed shadow lines on the screen. Its more noticibale when things klike football and snooker are on as the screen is mostly the same colour is there...


Sounds like burn-in. Yep, LCD TVs can have it too. If you look close, I would bet you will the channels that has the bars down each side line up pretty good with that shadowy line. I have spoken with Samsung about this issue in the past, they will not cover it.

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I have a veiwsonic n3752w LCD TV which is 3 yrs old,the screen on the left hand side as you look at it has a coloured line, pencil thin, and with the colour of green. This green pencil line is about 6...


A LOT OF THE LCD,s have cold solder joints, Inspect it with a magnafiying glass or somethingfor bad solder joints,bad,or burnt caps,or resistors, call ENCOMPASS PARTS DISTURBUTION for parts or service manuals.1-800-638-3328

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Vertical line on LCD TV Panel


Had this same issue on right side of 52" about 1 inch from side but had 3 vertical lines that disappeared after 40 minutes. Have Samsung LNT5265FX/XXA and about 16 months old. LCD Panel itself had to be replaced to fix it, fortunately had extended service plan

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40 inch lcd blue line vertical


The display screen is made of a matrix of elements connected to cables along the side and top. On your unit, some of these many, tiny connections are making contact intermittantly thus losing the elements in that area. These contacts are held in place with just pressure and if that is disturbed, you lose that line of elements. Try squeezing the cabinet of the TV on the outside at the top in the area of the loss and see if that makes a difference. May have to go inside and see if the contact assembly is disturbed or warped or something.
Hope ya fix it!

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