We have a Samsung HDTV 55″ inch LCD TV which is showing lines (vertically) and getting extremely hot. At times it powers on at only half of the brightness for a 20 seconds or so and then goes completely black like it is turned off. I do not know what I should be looking for or how to diagnose these TV problems. Do you think that replacing the power boards would be a good place to start? Maybe I need to open up the TV and start to check to see if the capacitors are okay? Where do I even get these TV repair replacement parts? Please help.
The issue could be related to a bad capacitor or capacitors. Maybe 10 years ago there was a Chinese capacitor supplier company selling faulty and low quality caps. Your TV may have these.
THINGS TO TRY TO FIX YOUR TV FAST:
- Try to connect all connectors including HDMI, coax, etc, to be sure all inputs are producing same issue.
- Push the HDMI connector firmly into the back of the set.
- Be sure your actual cable is not bad and causing the issue.
First: Open up the TV case (unplugged of course) and look for a bulging or leaking capacitor. If you see any that are leaking or fat and bulging, replace them. If you find no bad caps, you could replace the complete circuit board but that may be more than the TV is worth. Some of these issues are common on Samsung, Sony, Vizio, and Toshiba. Here are some places to buy caps and circuit boards for replacement HDTV parts.
2 Types of lines on a broken LCD TV screen
Possible Components That Could Be Bad:
Bad T-Con Main Control Board can cause vertical lines or half of the screen is black. Horizontal lines usually indicates a defective screen not a bad t-con board.
Bad Power Supply (Bad Capacitors, Blown Fuse, Bad rectifier) This means that the TV won’t turn on or shuts off randomly.
TV repair – Vertical lines on flat panel TV
- You have to find out, are the lines vertical or horizontal?
- Are the lines a certain color or black and white?
- What section of the TV, do the lines show up in?
- The top half?
- The lower half?
- The right side?
- Or the left side
- Is your screen discolored?
- Do the lines always appear on the screen when using different inputs?
- If you switch from HDMI-1 input to HDMI-2 input, are the lines still there?
- Do the lines on the screen show up over the menu or behind the menu?
- Do the lines always appear on the screen or are they intermittent?
HOW TO FIX LED TV VERTICAL LINES ON SCREEN
Do you have experience in fixing these types of TV issues? Please leave a comment below.
Written by Keith Schneerer
Certified Appliance Tech · Founder, RemoveAndReplace.com
Keith has spent 30+ years repairing machines, starting as a military mechanic and later maintaining food processing equipment before moving into appliance repair. He founded RemoveAndReplace.com to share field-tested repair advice.
More about Keith →
I have a CONCORD LED TV Slim panel, my 2 years 6 month old daughter poured a drink (Fanta) on the screen of the TV.
It shows 3 thin colored vertical lines on the middle of the screen.
They were pretty noticeable all the way then 1 line gradually fade until it disappeared and the other one halfway in the screen.
When I change the input or channel they are still there.
Then I switched off the TV and its been off for a day now, what should I do?
Will do that – been putting it off in all honesty as its fine when up to temp. Thanks.
Peter Fordham,
Have you checked ribbon cables? You should be able to test them with a meter for continuity.
Also you need to check the multiple pins on any of the ends of the cables or wires to be sure they aren’t shorted also.
-RR
Hi model number is Toshiba Regza 37XV635DB A bit old now I guess but still a very good picture when warmed up!
Many thanks for taking the time to answer appreciate any advise RR
Pete Fordham,
What is the model number of your Toshiba 37in LCD TV?
-RR
Thanks for your response.
I never thought of paper towel thing until I saw a guy on youtube demonstrate fixing such issue by spraying component cooler. I still don’t understand how that will fix something like that. So, I guess the liquid might have sopped through the edge and damaged the screen.
The lines go from one end to the other end and is very prominent on the bottom 4 inches and less prominent for the next 4 inches. So, yes they are on the bottom corners and bottom edge mostly.
I don’t think the issue occurred right after cleaning with paper towel.
My Toshiba LCD 37 INCH has horizontal lines and frozen when cold. If powered off completely it takes 20 minutes for the picture to stabilize and unfreeze and from then on its perfect. Leave on stand by it comes back a little faster from cold. Whilst in this frozen state the top few centimeters of the screen is normal with movement. Obviously heat related and been doing it for two years! Any ideas anyone?