How JustAnswer Works:

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

Ask Dan Your Own Question

Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 6894
Experience:  USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.
Type Your TV Question Here...
Dan is online now
A new question is answered every 9 seconds

I have an 42inch LG LCD tv. The sOund works but after a few

Customer Question

I have an 42inch LG LCD tv. The sOund works but after a few seconds, the picture will blink out. I switch to another input and get the same response- but the picture may remain for a longer time using the DVD or avi inputs
Any ideas. Is this a fuse or bad circuit breaker? Is this worth fixing? Can I order parts and do it myself?

I had been able to switch inputs from the menu: now the picture input cycles off before I can change the input. I get a grey screen, with the avi input and then all goes black. Now more sound not more picture. But the lack of sound Kay be due to the lack of a sound input signal. The sound was working fine when I had the hdmi input sell Ted. I cannot get the tv back to this input.

There is no back lighting as farbas I can tell. But then again, I have nothing to input anymore.
Thanks
Andy



model number 42 LG 30 UA
Product code : 42 LG 30 UA austljm
Serial 803mxzj01741
Submitted: 3 years ago.
Category: TV
Expert:  Dan replied 3 years ago.
Thanks for the question. My name is Dan.

Yes, you can order parts for this TV... they're readily available. And you should be able to affect repair yourself if you have some mechanical and electrical inclination.

Questions for you:

- When the picture goes out, does sound continue?
- When the picture goes out, please make the room as dark as possible. Are the backlights working? The screen might look dark gray (glowing slightly) as opposed to solid, pitch black.

Kindest regards,
Dan T.
Customer: replied 3 years ago.

Thanks dan
Yes,
the sound continues to work fine.
The screen goes completely out. No back lighting, no grey.
I have some limited skills- more theory than technical ability. But I can learn.

Andy
Expert:  Dan replied 3 years ago.

Ok, turn the TV on so you can hear the audio, then again please make the room as dark as possible. Then hold a flashlight very close to the screen and look for faint images, shadows, or movement of what should be displayed on the screen. You can try to bring up the TV menu, too... so you'll know what to look for. Can you see anything?

Customer: replied 3 years ago.
I am having trouble switching back to cable hdmi input. I plugged in my kids wii and now can't switch back. The tv goes on and displays the input (avi) that is selected and then blinks off.there is a sound that is a little like a modem that I hear which also cuts off when the screen goes blank. It is black. I see nothing but blackness.

Now the wi iis booting up to display an image....or sound.
Expert:  Dan replied 3 years ago.
So you turn it on and you see the selected input for a second, then it turns off and audio continues?
Customer: replied 3 years ago.
Yes, that is what was happening. Now I am no longer in an input mode that has audio so I can't tell. I can't get the imput back to hdmi so now I get nothing after a few seconds. Wnen the input was on hdmi, I still would get the sound signal because the tv is hooked up to my cable (verizon) box. I am on my blackberry for the 2 hours and away from my set and my computer.

Andy
Expert:  Dan replied 3 years ago.
Ok, let me know when you're ready to continue. You should be near the TV. No rush.
Customer: replied 3 years ago.
Hi Dan-

I am back home near my tv. When I was out my son played on his wi for a while until the picture went out. He said that the sound kept working. It is not working now.
Andy
Silver Spring, Maryland
Expert:  Dan replied 3 years ago.
Ok, now can you double check that flashlight test please?
Customer: replied 3 years ago.
The wii is working now..... Image and sounds. So I do not think the flashlightbtest is valid.
And
Expert:  Dan replied 3 years ago.
Wait for the picture to go black again... then use the flashlight. It'll go black again, just give it time. Let me know.
Customer: replied 3 years ago.
My son says he can see movement, (link ). I am having motor trouble than him.... Sound is on, faint shadows....hard to see......but something is there. It is black........no picture any more...
Andy
Expert:  Dan replied 3 years ago.
Ok, thanks!

There's about a 90% chance you're going to need new inverters. Your TV has 2... master and slave. The inverters are, essentially, the power supplies for the CCFLs in the backlight panel. If they fail, the CCFLs don't get the proper voltage and can't illuminate. The master is part number 19.26006.414, slave is 19.26006.413 and they'll run you about $50 each from moduslinkptstvboards.com (they rebuilt/recondition then resell).
graphic

Now, there's a slight chance you have a faulty main power supply (4%) or that the CCFLs themselves have failed (1%)... but both of these would be much more rare. If you have a voltmeter handy, check to see if you have 24VDC leaving the main power board and going into the inverters. If you do, the power supply is fine and will be removed from this list.

Please click ACCEPT (even if you're a trial or subscription member) if you are 100% satisfied with my answer and plan on leaving me positive feedback (your acceptance is the only way I get paid for my work). A bonus would also be appreciated!

I'm sorry if my answer wasn't what you wanted to hear, but it reflects the most honest and accurate information available. I hope you take that into account when deciding whether or not to accept and leave positive feedback.

That said, if you aren't fully satisfied please do not accept my answer. Instead, let me know what else I can do for you!

Finally, please know that accepting my answer does not mean our dialog is over... you can still post follow-up questions or comments afterward.

Kindest regards,
Dan T.




Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 6894
Experience: USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.
Dan and 5 other TV Specialists are ready to help you
Customer: replied 3 years ago.
Thanks for your help. I will give it a shot. For 100.00 it may be worth it. But If the price of plasma keeps dropping I may just get a new set..... If i can fix it, i may learn something along the way. ( I used to do some work for chungwha picture tubes from Taiwan. If I can fix a tv ( even a Korean one) I would get street cred.

Thanks again.......
Andrew c. aitken
Expert:  Dan replied 3 years ago.
Andrew,

Sorry for the delay... it was getting late last night. Yes... fix this yourself... you'll be happy you did, even if you replace it. Though for what it's worth, I would only get a plasma if someone gave it to me. LED (LCD) is a much more reliable technology... fewer things to go wrong.

Dan

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. VM United States
< Last | Next >
  • 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. VM United 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. Windy USA
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • TV Tech1

    Technician

    Satisfied Customers:

    4800
    30 Years experience. Authorized Warranty servicer.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TV/TVTech1/2013-3-25_625_TECH1Nobanner.64x64.jpg TV Tech1's Avatar

    TV Tech1

    Technician

    Satisfied Customers:

    4800
    30 Years experience. Authorized Warranty servicer.
  • http://ww2.justanswer.com/uploads/OR/OriginalSeadog/2011-7-22_191917_ProfilePicture.64x64.jpg Rod's Avatar

    Rod

    TV & Communications Sys Repair

    Satisfied Customers:

    2354
    FCC Commercial License, Previous owner of Electronics Repair shop, 40+ years in electronic systems.
  • http://ww2.justanswer.com/uploads/benimur/2009-03-29_003401_id_2.jpg Louie's Avatar

    Louie

    Technician

    Satisfied Customers:

    2208
    25+ yrs. experience in the field and 3+ yrs. online, down to component level.
  • http://ww2.justanswer.com/uploads/P0/p0llinate/2011-4-27_174649_tucker.64x64.JPG Nathan's Avatar

    Nathan

    Installer

    Satisfied Customers:

    1683
    Custom home theater installer, authorized dealer top brands.
  • http://ww2.justanswer.com/uploads/ST/steven.benoit/2011-4-1_194735_untitled1.64x64.jpg Steven's Avatar

    Steven

    Technician

    Satisfied Customers:

    1366
    Ma. Master Technician Lic. Authorized Warranty Support.
  • http://ww2.justanswer.com/uploads/IT/ITPeter/2011-5-3_23187_Pete.64x64.JPG Pete's Avatar

    Pete

    Electronic Engineer

    Satisfied Customers:

    1260
    12+ years experience installing and repairing electronics.
  • http://ww2.justanswer.com/uploads/3G/3guk/2011-1-15_132320_D1SC01363.64x64.jpg James's Avatar

    James

    Technician

    Satisfied Customers:

    1154
    AV Service Engineer (4 Years)