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I have an LG LB7100 That has a backlighting issue.

Customer Question
Hi,I have an LG LB7100...
Hi,I have an LG LB7100 That has a backlighting issue.Backlights appear to be ok when powering up as I get the LG logo and it will show input for a second before backlights go out.Opened it up and see the power board has a green led on it that flashes 4 times stops and then repeats the 4 flashes and stops on and on
Submitted: 1 month ago.Category: TV
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Answered in 1 hour by:
3/17/2018
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 1 month ago
Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 7,478
Experience: USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.
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Welcome to the site! Are you sure the TV is staying on when the backlights go out? If you shine a flashlight into the screen after they go out, can you see what is supposed to be displayed?

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Customer reply replied 1 month ago
image is there with sound--just can't see unless flashlight used.
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 1 month ago

OK let me pull up some service data.

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TV Technician: Dan, Master Tech and Repair Facility Trainer replied 1 month ago

What size screen is this?

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Customer reply replied 1 month ago
60
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 1 month ago

OK, thanks. I've seen this issue several times on these new LED sets from LG. It can come from a couple different areas but it's almost always a defective LED set behind the screen (the backlights themselves). They are probably 6916L-1720A LEDs but you would want to confirm by comparing the ones behind your screen to the ones shown >>HERE<<. If you do replace the LEDs, you should install the latest TV software after installation to minimize the risk of repeat failure.

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TV Technician: Dan, Master Tech and Repair Facility Trainer replied 1 month ago

Do you still need help with this?

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Dan
Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 7,478
7,478 Satisfied Customers
Experience: USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.

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