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: 6887
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

my LG 32LG10 has no picture or sound but the TV does have power.

Customer Question

my LG 32LG10 has no picture or sound but the TV does have power. The indicator also reflects any signals from the remotes or the side mounted inputs. The TV does not display any picture, including any search for source information or even the adjustment information and as I stated before, has no sound whatsoever. Also when switch off and switch on the TV the display comes for half a sec and goes off.

Let me know how to fix this issue.
Submitted: 3 years ago.
Category: TV
Expert:  Dan replied 3 years ago.
Hello,

Thanks for the question. My name is Dan.

Let's try a couple things so we can narrow this down. Turn the lights off, and turn the TV on. Though the screen is black, can you see a faint glow coming from it, like the backlight is working? If you can detect the backlight, stop here and let me know. If you can't detect the backlight... with the TV still on, try holding a flashlight 1-2 inches from the screen. Can you see faint images or colors? Try bringing up the TV menu, so you’ll know what to look for.

Regards,
Dan
Customer: replied 3 years ago.
hello Dan,

no i can't see any light

Expert:  Dan replied 3 years ago.
And nothing with the flashlight?
Customer: replied 3 years ago.
when i start the TV it flashes for a half sec and goes of. I can flash light in the starting
Expert:  Dan replied 3 years ago.

Ok, thanks. There are a couple possibilities here. I'll do my best to give some insight into each.

First, it could be your power supply (PSU). This circuit takes the line input... chops/rectifies/filters it, and sends it to the different circuits (3V, 5V, 24V, etc.). A fault here could very easily explain your symptoms... as this is the base for everything else. Repair here will vary depending on where you live, and on part availability, but usually runs $250-$450.

Next, it could be the main board. This is your TV's main processor, so to speak. It controls the logic functions, and all I/O capabilities. So again, this could be your issue. Repair cost will be slightly more than the PSU, usually $100-$200 more.

Finally, it could be the LCD panel itself (the screen). You're well aware of what part this is. Though, this would be far too expensive to replace... as it's the most expensive in your TV, by far.

I wish I had a more definite answer on this one... but there really are a couple possibilities. You'll need a tech to determine for sure.

If this information was helpful, please click "Accept"... it's the only way I get paid for my work. You can still post follow-up questions afterward.

Customer: replied 3 years ago.
Hello Dan,

how to identify the problem is with PSU or main processor. I searched on google and people told me that problem may be with inverter. i got a part from someone and tried but no luck
Expert:  Dan replied 3 years ago.
I don't think it's the inverter. That's what the flashlight test was for. If you were able to see an image, chances are the inverter is bad. No image with the flashlight... inverter is probably OK.

You should only poke/prod/test inside your TV if you have experience... as your TV harbors lethal voltages (kilovolts), even when it's unplugged. That said, the PSU will be the first PCB you encounter while tracing the input power cord. You'll need to look/smell/test for burnt or open (missing) components... or bulging/swollen capacitors like these. They might also be leaking. If you have a multimeter or oscilloscope, you can test the output voltages, too... they should be labeled (use the panel or chassis for ground). Else, consider replacing the whole PSU... it will cost more than a component or two, but will save you time and frustration.

That's the first step here... eliminating the PSU.

-Dan
Customer: replied 3 years ago.
can i ask more questions after pressing the accept answer button?

Expert:  Dan replied 3 years ago.
Certainly! As long as they apply to this issue =)
Customer: replied 3 years ago.
ok tell me one more thing. how to see whether problem is not there with main processor.

i have little knowledge on electronics boards. i would like to identify where is the problem.
Expert:  Dan replied 3 years ago.
There usually aren't many things to check on the main board, except waveforms... and you'd need an oscilloscope for that. Usually there is a heatsink or two... you could remove the back panel and turn the TV on for awhile, then touch the heatsinks. If they're stone cold, something is probably wrong with the board.

Else, again... start with the PSU. If the PSU doesn't fix things, go for the main board.

-Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 6887
Experience: USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.
Dan and 3 other TV Specialists are ready to help you
Customer: replied 3 years ago.
ok thanks. I will be questions about the same issues.
Expert:  Dan replied 3 years ago.
No worries. Let me know.

There is no need to reply to this post unless you have further questions. Doing so will only generate a request for me to reply.
Customer: replied 3 years ago.
Hi Dan,

thank you so much for all your help on identifying problem.

Thanks,
Jagan
Expert:  Dan replied 3 years ago.
No problem, Jagan. Let me know if you need anything else.

There is no need to reply to this post unless you have further questions. Doing so will only generate a request for me to reply.

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)