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 Rick williams Your Own Question

Rick williams
Rick williams, Technician
Category: TV
Satisfied Customers: 7432
Experience:  20 YEARS OF TV REPAIR ALSO HD, DLP LCD AND PLASMA EXPERIENCE
10191312
Type Your TV Question Here...
Rick williams is online now
A new question is answered every 9 seconds

I have an LG plasma TV model 42PG20-UA. The blue(power) light

Resolved Question:

I have an LG plasma TV model 42PG20-UA. The blue(power) light comes on, but nothing else happens; no video, no sound. What might be the problem?
Submitted: 4 years ago.
Category: TV
Expert:  Rick williams replied 4 years ago.

Hello friend, Thank you for posting your question on Just Answer! I will be happy to help you with this problem, And possibly help you save on these Labor charges today, So please don't Accept my answer unless you are satisfied, Can you please give us some more information so I can better answer your question?

 

have you any Television electronics experience? if not A family/friend with electronics skills that can help you out.

Do you have a meter and Tools?

Are to trying to repair your Self?

Just know what to say to the tech, so time isn't a problem in repairs?

 

Customer: replied 4 years ago.
I am a high school electronics teacher. I also built and sold computers for several years. I was, however, never very good at working on analog CRT's. I have a digital multimeter and an o-scope if necessary. This TV looks very simple inside; only about five boards, and looks like no adjustments should be required. Just identify the bad board(s) and repalce it (them). I hope I'm right. I'd like to do this myself.
Expert:  Rick williams replied 4 years ago.

 

(Please click on high lighted words) this is my sample may not be the same model but doesn't matter the technology is the same.

 

 

Would like for you to take your meter and place it on DC voltage the positive end on every connector that says a voltage and the negative wire to the panel this is the best ground. Turn on and see if the voltage is present at the VS, VA, V-scan, According to the Label. Also if a voltage is missing remove each board from the power supply to make sure they are not holding down the voltage If you don't find one that's trying to climb, or shows close to what it should be, another method is to locate a short circuit place meter on ohms or beep test follow same procedure no voltage should be shorted to ground. And this is the problem. You can unplug each board one at a time, Starting with the Y-SUS then the Z-SUS.

Friend this is a very common problem with plasma. Within the power supply the capacitors

Start to fail and the way you can tell is to check them visually for swelling or expanding of the top.

It will be easy to see the bad caps will not be as flat on the top as the good ones

 

Normally the parts for this unit is a kit Y-SUSTAIN AND Z-SUSTAIN BOARD, this is what most manufacturers would want you to do, purchase them. But go to high lighted words and go through all the voltage checks to find the bad part, here is also a chart that should help a lot, also this is a picture that will help with identity.

Well Good luck friend, and if my efforts are appreciated, feedback and a bonus will be appreciated

 

Thanks Simplified click here

Customer: replied 4 years ago.
Thanks Rick! I'll have to wait until tomorrow to do the work you suggested. Can we continue this tomorrow evening? Also, I have taken pictures of the circuit boards. Can I send them to you? How can I do so? I'd like for you to see my TV and help me identify the Y-sus and Z-sus boards. I visually checked all the caps and didn't see any obviously bad ones.
Expert:  Rick williams replied 4 years ago.
Sure,, upload on your tool bar,, using the tree picture
Customer: replied 4 years ago.
graphic

Here's the whole thing. I also have pics of individual boards. How can we pause our discussion until tomorrow so I can check the voltages you suggested?
Expert:  Rick williams replied 4 years ago.
just reply to this message later
Customer: replied 4 years ago.
ok, Rick. I've marked this page. I hope I can get back to you tomorrow. Your help is certainly aappreciated. I don't want to stiff you on the money thing. If I can get this thing to work, it'll be worth more than $13. If you don't hear from me its because I can't figure out how. My email address isXXX@XXXXXX.XXX. If you don't hear from me tomorrow, email me, please.
Expert:  Rick williams replied 4 years ago.
This message dont reply until ready
Customer: replied 4 years ago.
Results of this evenings work:
I set out to check the voltages that you suggested: VS, VA, etc. However, I could not get the unit to power on. Although the blue LED surrounding the on/off switch is lit, pushing the putton produces nothing. There were no voltages at any of the points you mentioned.

The power button leads to a board that contains all other inputs and outputs. I think its called the main board. I decided to unplug the connector at the power supply board that leads to this main board and see if the main board is getting power. When I did this, and plugged the unit in, it tried to power up. A relay clicked and an LED lit up on one of the other boards. I didn't leave it on long, only about 15 seconds, not long enough to check voltages anywhere else. Could this main board be the problem? I didn't expect the TV to power up with this board disconnected.
Expert:  Rick williams replied 4 years ago.

Yes, sir sounds good to me,, main board

 

These are some part stores, CALL THEM IF POSSIBLE always check with manufacturer, and you may need the name of the part and its part number off the part itself

www.andrewselectronics.com

www.partstore.com

 

www.mcmelectronics.com

 

www.encompassparts.com

And this one rebuilds board's very helpful company

www.PTSCORP.COM

www.tristatemodule.com

Well Good luck friend, and if my efforts on trying to help you save on those large labor charges are appreciated, feedback and a bonus will be appreciated

 

Thanks.

 

 

 

 

And also manuals sites

www.completeservicemanuals.com

www.free-service-manuals.com

www.s100-manuals.com

www.eserviceinfo.com

www.manuals-paradise.com

 

Rick williams, Technician
Category: TV
Satisfied Customers: 7432
Experience: 20 YEARS OF TV REPAIR ALSO HD, DLP LCD AND PLASMA EXPERIENCE
Rick williams and 3 other TV Specialists are ready to help you

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)