TV

Facing TV Problems? Ask a TV Technician.

Ask an Expert,
Get an Answer ASAP!

TV

I have an LG 50PK550 plasma tv that has a problem with the

Customer Question
picture not appearing but I...
I have an LG 50PK550 plasma tv that has a problem with the picture not appearing but I can hear sound. In one instance the display managed to turn on but it was static noisy picture and I could still faintly see the menu and navigate it but after that time the display no longer turn on. Any help fixing or at least diagnosing the problem would be greatly appreciated.
Submitted: 2 years ago.Category: TV
Show More
Show Less
Ask Your Own TV Question
Answered in 3 minutes by:
7/14/2015
TV Technician: Anthony_Infotech, Technician replied 2 years ago
Anthony_Infotech
Anthony_Infotech, Technician
Category: TV
Satisfied Customers: 15,172
Experience: 20+ years experience TV expert (field and bench) 9 approved qualifications in TV-ELECTRONICS
Verified
Hello my name is Anthony
Welcome
Thanks for the Question
Sorry you're having trouble hopefully I can help, the first check is press the menu button of the sets own remote control does the menu come up?
If not can you see any feint light at all on the display even in a darkened room and even for a second?this will indicate if the panel is primed or not
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
Hi AnthonyThe menu does not appear and there is no feint light on the display.
TV Technician: Anthony_Infotech, Technician replied 2 years ago
OK its very likely the Y scan board is none operational however there is a procedure to follow to confirm that using a meter (volt/ohms/amps)to check the Vs or VSUS and the Va scan voltages on the power-board depending on the result of those checks moves the diagnosis on, if you think you can do this work let me know it will mean replacement of a board or boards.
Sorry its nothing easier.
A tech would charge around $280 for the work you can locate a approved tech in your area by using this web address www.tvrepairpros.com
Let me know if you can do this or need more info
A positive rating is appreciated thank you, ***** ***** be a rating bar of smileys or stars with this post please pick out a positive rating and click submit or finish thanks again, rating me positively is the only way I receive a proportion of the fee from the site, please note the question will remain open.
If for some reason you do not see the rating bar please let me know and let me know in that case if you are satisfied with my diagnosis or answer.
Regards
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
on the power board the Vs reads 200V and Va is 60V
TV Technician: Anthony_Infotech, Technician replied 2 years ago
Hello
That sounds OK and this is WITH both scan boards connected you HAVE NOT disconnected them?
If so run the set for 15mins , switch the set off and feel the heatsinks on the scan boards left and right are they warm or cold?
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
yes this is with both scan boards connected.Heatsinks on the Y board are warmed up (some of the heatsinks are warmer than others) and Z board they are cold.
TV Technician: Anthony_Infotech, Technician replied 2 years ago
And the logic board has the light blinking about once every second yes?
Has the set suffered a storm damage or any other outcome like that?
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
the logic board blinks in this sequence, long blink,quick blink, pause, long blink,quick blink, long pause.Unfortunately I wasn't home at the time the display stopped working but we were bad storm for a couple weeks.
TV Technician: Anthony_Infotech, Technician replied 2 years ago
There is no short circuit on the power-board so usually if the scan boards fail they go short and take down the power-board, it could be a logic board issue as I suspect that blinking is not correct, its the thing I would replace next unfortunately in this situation your left swapping out boards to eliminate....there is no effective check for any board except when they go short (scan boards)...its a possibility too that the Z board or both are bad, storm damage is the usual culprit for this type of problem
Let me know which way you want to go with this
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
if the control board is bad would it cause the z board to not function since it doesn't even get warm and does the blink pattern mean anything?
TV Technician: Anthony_Infotech, Technician replied 2 years ago
No there is no blink code but the blinking can become erratic or no blink at all the logic board controls the action of the scan boards and yes it could be the Z board or both there is no way of knowing you would need to swap boards in a workshop its usual to be able to do that you do not have that option without ordering boards, the thing is there is no short circuit the most common cause of scan board failure is a short circuit taking out the Vs and Va, one other thing carefully check the panel itself for any cracks
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
The panel is definitely not cracked at one point it managed to display a static picture and I could faintly see the menu and move around but since that time it hasn't come back on.
TV Technician: Anthony_Infotech, Technician replied 2 years ago
Its as I have already explained your caught between a rock and a hard place with the swapping of boards even at workshop level we are left doing the same and its not just with plasma LCD are the same, you can get someway into checking then its just down to experience and the most suspicious board....I would change the logic board then the Z
The mainboard is working because you have the logic board doing something and you have sound
Anthony
Ask Your Own TV Question
TV Technician: Anthony_Infotech, Technician replied 2 years ago
If you wish to order the boards you will need the part-numbers found on the boards themselves then using those part-numbers www.shopjimmy.com or google the part-numbers thank you
If you need any more info please let me know
Regards
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
After doing research I was hoping to get a some guidance on what specifically to test for like capacitors, diodes or transistors etc that I have seen others test/replace on various tv repair forums and youtube videos. Thanks for the help tho
TV Technician: Anthony_Infotech, Technician replied 2 years ago
No there is no way to do that, the boards do not lend themselves to component level repair its ALWAYS aboard replacement exercise even at workshop level 90% of the time, its because the boards are densley populated with electronics and even the soldering is not approachable if it was you would need very expensive solder/desolder equipment, I know you do not like what you are hearing but honestly this IS the way it is, there cant be a you-tube video for this otherwise you will not be asking the question...
I will help you but you must swap out the logic and maybe the Z sus
Anthony
Ask Your Own TV Question
Customer reply replied 2 years ago
I didn't mean youtube video for my specific tv but I've seen video on other tv brands/models being repaired this way on youtube channels like tampatec and even Shopjimmy's own youtube channel, there is just not much info on my tv that's why I asked here. Even shopjimmy.com sells kits to replace components that have failed, like this kit (again not my tv but just an example) http://www.shopjimmy.com/panasonic-txnsc1eduu-sc-board-component-repair-kit.htm. I do have soldering/desoldering equipment and I've fixed my amplifier and other audio equipment in the same manor with help from users on audio forums.
TV Technician: Anthony_Infotech, Technician replied 2 years ago
Yes I understand what you say but NOT in this instance, the Zsus is $32? the logic $24 why get involved with component repair when the boards are that cheap?and also NOT for every fault (as per what you say)
Sir you have asked a question I have replied with my answer(s) if you don't believe them you have the option of opting me out or I will opt out
Anthony
Ask Your Own TV Question
Ask Anthony_Infotech Your Own Question
Anthony_Infotech
Anthony_Infotech
Anthony_Infotech, Technician
Category: TV
Satisfied Customers: 15,172
15,172 Satisfied Customers
Experience: 20+ years experience TV expert (field and bench) 9 approved qualifications in TV-ELECTRONICS

Anthony_Infotech 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

2,906 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

1,425 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
Was watching TV on my Panasanic Viera Plasma TV and all of a
was watching TV on my Panasanic Viera Plasma TV and all of a sudden the sound went out … read more
Mike G.
Mike G.
Television Repair Technician
Vocational, Technical or Trade Scho
1,672 satisfied customers
Pioneer elite plasma tv model pro1140hd. No picture.
Pioneer elite plasma tv model pro1140hd. No picture. Blinking blue light next to power button.Unplugged power for two minutes. … read more
Anthony_Infotech
Anthony_Infotech
Technician
15,172 satisfied customers
Our panasonic plasma tv model th-p50ut50a is not allowing
our panasonic plasma tv model th-p50ut50a is not allowing wireless connection - would you help? It works on and off. Wireless reception is fine in the room - (I am currently using it on my wireless ma… read more
Louie
Louie
Technician
Associate Degree
2,906 satisfied customers
My Panosonic Plasma tv was working this morning and when I
My Panosonic Plasma tv was working this morning and when I disconnected my dvr box to attach to another tv since the technician was going to switch the box to another tv it stopped working. I tried tr… read more
Aric
Aric
Owner/Operator of a custom AV company
Run A/V and repair business for over
13,651 satisfied customers
Looking for a remote control replacement. PDP42V18HA
nothingt is working no matter what I do with the manual buttons I keep getting no aignal … read more
Louie
Louie
Technician
Associate Degree
2,906 satisfied customers
I have vertical lines in plasma tv. PN42A450P1D 9YRS. About
i have vertical lines in plasma tv JA: What's the model number of your TV? How old is it? Customer: PN42A450P1D 9YRS JA: Does the TV menu work? Do you have the same problem on all sources/inputs? Cust… read more
Richard
Richard
IT Manager
IT Manager, Consultant
3,214 satisfied customers
Samsung plasma tv 550 series has good image but when first
Samsung plasma tv 550 series has good image but when first power on a green screen pattern then it auto magically shuts down and starts up again with perfect image and sound Is it my hdmi to cable box… read more
p0llinate
p0llinate
Bachelors of Science
14 satisfied customers
I have vertical lines on my plasma TV, samsung pn63C8000,
a few weeks started with 1-2 lines and now there are a whole bunch … read more
p0llinate
p0llinate
Bachelors of Science
14 satisfied customers
I have a Pioneer Plasma TV model PDP 505PU (yep, it's old).
I have a Pioneer Plasma TV model PDP 505PU (yep, it's old). it has functioned perfectly for many years and from one moment to the next, the screen went totally black except for some tiny green spots i… read more
Anthony_Infotech
Anthony_Infotech
Technician
15,172 satisfied customers
My Panasonic 50 inch Plasma TV just suddenly stopped having
Hi John, My Panasonic 50 inch Plasma TV just suddenly stopped having a picture. The power lght is on but I can't get it to show any picture. … read more
Richard
Richard
IT Manager
IT Manager, Consultant
3,214 satisfied customers
Can't get closed captio to work. Plasma tv z42pt320. Menu
was working but stopped can not get it to se caption,about a month … read more
Shahid
Shahid
Owner of Repair Shop
High School or GED
3,494 satisfied customers
Looking for a 42 inch Panasonic Plasma Tv. Help Me. I had a
Looking for a 42 inch Panasonic Plasma Tv. Help Me … read more
Electrotech2017
Electrotech2017
Audio and Video Technician
Vocational, Technical or Trade School
85 satisfied customers
I have a Panasonic TH_50PZ85U Plasma TV that will not turn
I have a Panasonic TH_50PZ85U Plasma TV that will not turn on after moving it to a different room. The power light is flashing 13 times then starts over with another 13 flashes. What does this mean? … read more
Anthony_Infotech
Anthony_Infotech
Technician
15,172 satisfied customers
Have a PN50B53052FX2A plasma tv that i want to connect to
have a PN50B53052FX2A plasma tv that i want to connect to sound bar HW-KM55C. i do not believe i have SoundConnect feature. now what? … read more
p0llinate
p0llinate
Bachelors of Science
14 satisfied customers
Can yo supply remote control unit for an LCD TV receiver
Can yo supply remote control unit for an LCD TV receiver L42E9ADF and if yes,what will be the cost? Karel Tille… read more
p0llinate
p0llinate
Bachelors of Science
14 satisfied customers
How can I get the remote control my tv remote control is
Hi sir how can I get the remote control my tv remote control is broken and my serial # LX20600039. … read more
Mike G.
Mike G.
Television Repair Technician
Vocational, Technical or Trade Scho
1,672 satisfied customers
I have a 22 inch Voxson LCD TV with DVD. The remote control
I have a 22 inch Voxson LCD TV with DVD. The remote control is hard to connect. Do you have replacement remote controls please? … read more
Louie
Louie
Technician
Associate Degree
2,906 satisfied customers
The remote control for my plasma TV ( PDP 505HDG) is
The remote control for my plasma TV ( PDP 505HDG) is faulty.Where do I buy a replacement in Perth WA … read more
Sam Dennis Bradley
Sam Dennis Bradley
owner
Vocational, Technical or Trade School
59 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