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My LG TV 42LT770H-UA has a vertical line down the left hand

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side of the screen?...
My LG TV 42LT770H-UA has a vertical line down the left hand side of the screen?
Submitted: 2 years ago.Category: TV
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Answered in 1 minute by:
9/15/2015
TV Technician: Aric, Technician replied 2 years ago
Aric
Aric, Technician
Category: TV
Satisfied Customers: 45,073
Experience: 15+ years in the field. Owner of AV Installation, OEM and Repair company
Verified

Hello, How long have you owned the set for and when did the problem occur?

Also, what sources are connected to the set (DVD player, cable box, etc.), and is the white line there regardless of source you select?

How thick is the line on the screen as well please?

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Customer reply replied 2 years ago
Hi Aric, Me Tim again. Just had you recommend changing out the Main Board for my Panasonic 50¨
TV Technician: Aric, Technician replied 2 years ago

Hi Tim- thanks for the question. Can you reply back to the info request above please?

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Customer reply replied 2 years ago
I have owned the LG for 8 months but it is 3 years old. The problem just started when I turned it on 5 minutes ago. The line is about 1\2 an inch thick. ROKU and Cable is connected and connected or not there is a line?
TV Technician: Aric, Technician replied 2 years ago

Okay thank you. Please unplug the TV from power, and also remove the HDMI cables from the back. Wait 10 seconds and plug them back in and plug the TV back in. Check both the Roku source, and also the Cable source, and let me know if BOTH exhibit the line please.

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TV Technician: Aric, Technician replied 2 years ago

Is the line still there on both sources please?

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Customer reply replied 2 years ago
both exhibit the line!
TV Technician: Aric, Technician replied 2 years ago

This means the line is generated within the TV. There's no adjustments to remove the line. It's either caused by the T-Con (LCD controller) or the LCD panel itself (which is not repairable). Given it's a 1/2" thick- there's a good chance it's only the T-Con that needs to be replaced. Does the line move or flicker at all- or is it completely stationary?

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Customer reply replied 2 years ago
The line is stationary but there is a green, pink and black line within that half inch.
Customer reply replied 2 years ago
I was doing some other investigations and found other amateurs are saying that the soldering or connections in the main board may be affecting the vertical line? What do you think?
TV Technician: Aric, Technician replied 2 years ago

Okay, the only attempt at a fix is to replace the LCD controller board (T-Con) in the set- as there's no way to determine if the -Con or LCD panel itself have failed. The Mainboard is not anything I've ever seen cause this line. Vertical lines are generated by the T-Con or the panel itself. You can try to touch up the solder joints on the mainboard, but I honestly would not pursue that route myself.

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Customer reply replied 2 years ago
I would like to replace the LCD controller board (T- Con) myself. Can you point me in the right direction again to purchasing the correct part?
TV Technician: Aric, Technician replied 2 years ago

I am unable to find any parts at all available for that model number. Are you in the U.S. like the site shows? Or is there another model number off the back of the TV?

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Customer reply replied 2 years ago
I will take a look for another model number.
TV Technician: Aric, Technician replied 2 years ago

Okay.

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Customer reply replied 2 years ago
TWFM-BOO3D
Customer reply replied 2 years ago
42LT77OH?
TV Technician: Aric, Technician replied 2 years ago

TWFM-BOO3Dn is a Wi Fi chip, and I can find a manual for a 42LT770H- but not a single part for this model.

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Customer reply replied 2 years ago
YIKES what do I do?
TV Technician: Aric, Technician replied 2 years ago

The only thing you can try is remove the back of the TV and take a picture of the back. See if there's a metal shield in the upper middle of the screen. If so, the T-Con is underneath that shield, and there will be a part number on it.

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TV Technician: Aric, Technician replied 2 years ago

I'm signing off for the night- as it's late here, but you can postback at any time, and I will continue tomorrow morning.

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Customer reply replied 2 years ago
Thank you! Have a good night!Tim
TV Technician: Aric, Technician replied 2 years ago

Did you ever end up getting the back of the TV off?

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Aric
Aric
Aric, Technician
Category: TV
Satisfied Customers: 45,073
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Experience: 15+ years in the field. Owner of AV Installation, OEM and Repair company

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