TV

Facing TV Problems? Ask a TV Technician.

Ask an Expert,
Get an Answer ASAP!

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: 4 months ago.Category: TV
Show More
Show Less
Ask Your Own TV Question
Answered in 1 hour by:
3/17/2018
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 4 months ago
Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 7,481
Experience: USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.
Verified

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?

Ask Your Own TV Question
Customer reply replied 4 months ago
image is there with sound--just can't see unless flashlight used.
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 4 months ago

OK let me pull up some service data.

Ask Your Own TV Question
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 4 months ago

What size screen is this?

Ask Your Own TV Question
Customer reply replied 4 months ago
60
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 4 months 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.

Ask Your Own TV Question
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 3 months ago

Do you still need help with this?

Ask Your Own TV Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a tv technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Dan Your Own Question
Dan
Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 7,481
7,481 Satisfied Customers
Experience: USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.

Dan is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I'm screaming your praises!! WOW! I plugged my TV in and bammo! The picture came on bright and beautiful. What a relief! YOU saved me some money and headache.

VMUnited States

I love this site! $9 instead of a repairman or new/used frig can't be beaten. This older woman will worry less now that she knows about this site. Bless you all.

WindyUSA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

< Previous | Next >

Meet the Experts:

Louie

Louie

Technician

3,022 satisfied customers

25+ yrs. experience in the field and 5+ yrs. online, down to component level.

Rod

Rod

TV & Communications Sys Repair

2,355 satisfied customers

FCC Commercial License, Previous owner of Electronics Repair shop, 40+ years in electronic systems.

Steven

Steven

Technician

1,457 satisfied customers

Ma. Master Technician Lic. Authorized Warranty Support.

euro-pro llc

euro-pro llc

Technician

1,128 satisfied customers

20 years in TV repair,certified by all major brands- Sony,Samsung, LG,Toshiba, Panasonic, RCA,

Daniel

Daniel

Electrical Engineer

1,072 satisfied customers

BSEE (Electrical Engineer), 10+ years electronic design experience ,chip, board, component expert

Conrad

Conrad

Technician

946 satisfied customers

Training on many types of consumer electronics, training on Sony Samsung and JVC

Neil

Neil

Technician

803 satisfied customers

More than 10 years experience repairing TV's and electronics equipment.

< Previous | Next >

Related TV Questions
I have LG 55UB8500 JUST STOP WORKING, AFTER RESEARCH I
I have LG 55UB8500 JUST STOP WORKING , AFTER RESEARCH I THOUGHT THE POWER BOARD I REPLACE 2 OFF THEM STILL HAVE THE SAME PROBLEM WHEN I PUT THE TV ON THE LG SIGN IS ON THE GOES BLACK … read more
Shahid
Shahid
Owner of Repair Shop
High School or GED
3,506 satisfied customers
When I press the power button, the signal light will flash
When I press the power button, the signal light will flash three times and then remain steady the screen will flash and off again … read more
Jack
Jack
technician
factory trained engineer
2,164 satisfied customers
Second opinion] I have an LG LB7100 That has a backlighting
Second opinion] 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.Opene… read more
Louie
Louie
Technician
Associate Degree
3,022 satisfied customers
I have a lc-90le657bu that is blinking 1 slow and 1 fast
I have a lc-90le657bu that is blinking 1 slow and 1 fast after displaying the Sharp logo on the screen after it displays the logo about 10 sec later starts blinking and the power shuts off to the back… read more
Shahid
Shahid
Owner of Repair Shop
High School or GED
3,506 satisfied customers
Lg 55LA7400 - TV goes on for 3-4 minutes then goes black,
lg 55LA7400 - TV goes on for 3-4 minutes then goes black, audio remains fine. Done some research, replaced power board - same problem. Just noticed power board has an LED on it - TV goes on...then off… read more
Mike G.
Mike G.
Television Repair Technician
Vocational, Technical or Trade Scho
1,674 satisfied customers
LG MOD 47LM5790-U1, 4 YR OLD, screen is black, sometimes
LG MOD 47LM5790-U1, 4 YR OLD, screen is black, sometimes flashes "LG" mometarily and will sometimes turns off if a different channel is selected, Audio OK … read more
Aric
Aric
Owner/Operator of a custom AV company
Run A/V and repair business for over
13,666 satisfied customers
When I put on the tv it just flashes then go black. Sound it
when I put on the tv it just flashes then go black. Sound it is ok. … read more
Aric
Aric
Owner/Operator of a custom AV company
Run A/V and repair business for over
13,666 satisfied customers
I have a TEAC LEV3292HD LED tv. I cannot get any vision when
I have a TEAC LEV3292HD LED tv. I cannot get any vision when I turn on. The red power light is working and the remote turns it to green. The TEAC logo appears but within a few seconds it flashes red/g… read more
Sam Dennis Bradley
Sam Dennis Bradley
owner
Vocational, Technical or Trade School
59 satisfied customers
Polaroid 55" DE550M3N4AU-YA4 red light comes on when plugged
Polaroid 55" DE550M3N4AU-YA4 red light comes on when plugged in, but when you hit "power", light turns off, a few seconds later, Polaroid logo flashes briefly then disappears and nothing else happens.… read more
Shahid
Shahid
Owner of Repair Shop
High School or GED
3,506 satisfied customers
I have a Sony KDL-46EX500 LCD TV that when plugged in has an
I have a Sony KDL-46EX500 LCD TV that when plugged in has an amber stand by led. When the power button is pressed the amber led turns blue a but no backlight, no audio or video. Can't turn off TV with… read more
Shahid
Shahid
Owner of Repair Shop
High School or GED
3,506 satisfied customers
My name is ***** *****. I have a LG 55LE5400 TV. The TV has
Hi my name is ***** ***** . I have a LG 55LE5400 TV. The TV has no picture , or backlight and no sound. the power supply PCB has been replaced. All voltages are normal on this new board. the other PCB… read more
Aric
Aric
Owner/Operator of a custom AV company
Run A/V and repair business for over
13,666 satisfied customers
I have an LG 42LN5700, that turns on, but the display shuts
I have an LG 42LN5700, that turns on, but the display shuts off after the logo flashes. Afterwards, the sound works and I have the faint ghost images. The LED flashes twice after the screen turns off,… read more
Aric
Aric
Owner/Operator of a custom AV company
Run A/V and repair business for over
13,666 satisfied customers
Sharp LC-60LE810UN won't power on.Front LED blinks one short
Sharp LC-60LE810UN won't power on.Front LED blinks one short and one long blink constantly. Any ideas on how to fix it ??… read more
Shahid
Shahid
Owner of Repair Shop
High School or GED
3,506 satisfied customers
I have a lg 50ln5750 led tv as soon as I push the on button
I have a lg 50ln5750 led tv as soon as I push the on button on the smart remote the tv comes on but the lg logo flashes and goes out help please.… read more
Aric
Aric
Owner/Operator of a custom AV company
Run A/V and repair business for over
13,666 satisfied customers
I have an LG 42LA6200-UA TV. Recently the TV will power on,
I have an LG 42LA6200-UA TV. Recently the TV will power on, flash the LG logo, and then go blank. The center power indicator light will flash two times. I will still have sound, and If I shine a flash… read more
Aric
Aric
Owner/Operator of a custom AV company
Run A/V and repair business for over
13,666 satisfied customers
Model: LG 55ls4500Problem: Turn on power on get power indicator
Model: LG 55ls4500 Problem: Turn on power on get power indicator steady red 2 seconds then 3 or 4 short red blinks then LED turns off. Plug in a TV source (audio & video) get sound dark gray screen, s… read more
Michael Hannigan
Michael Hannigan
Bachelor\u0027s Program
239 satisfied customers
I have a Emerson LCD TV lc320em9 3 --- momentary the red led
I have a Emerson LCD TV lc320em9 3 --- momentary the red led then it goes out and the green led starts flashing---after a couple of seconds later the green led flashes faster and thats all I get till … read more
Anthony F.
Anthony F.
Owner
High School or GED
70 satisfied customers
My Polaroid LCD TV model TLX-04044B shows polaroid logo and
My Polaroid LCD TV model: TLX-04044B shows polaroid logo and the screen turns black after the LED flash blue for about 6 or 7 times. After that the LED stays blue. I changed both backlight envertors a… read more
Bluextc89
Bluextc89
Owner
Vocational, Technical or Trade Scho
243 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x