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 Steve G. Your Own Question

Steve G.
Steve G., Technician
Category: TV
Satisfied Customers: 16906
Experience:  VP of electronic repair company. Audio nut.
329447
Type Your TV Question Here...
Steve G. is online now
A new question is answered every 9 seconds

hello, I have a dell 4201C. 42 plasma. its been through a

Customer Question

hello, I have a dell 4201C. 42'' plasma. its been through a power surge of some sort and no longer has picture or sound. I am an E.E. student and know my way circuit boards and am capable of testing components, but have never touched a plasma TV before. Where do i start once getting the back off of the unit? What is commonly fried in a situation like this? Do you know where I can find a parts diagram for this model? Thanks for your help!!
Submitted: 6 years ago.
Category: TV
Expert:  Steve G. replied 6 years ago.

Hi and welcome to Just Answer. I'm sorry to hear about your TV.

 

Is there any sign of life at all? Clicks? LEDs? Buzzing?

Customer: replied 6 years ago.
Yes. When i turn it on the blue power led illuminates, and i here a click like the TV would turn on, but no picture and no back light.
Expert:  Steve G. replied 6 years ago.

Hello again. I would start with the power supply although I have no idea where to get spares for this model. It would have to be repaired maybe.

 

The easiest thing to check is the main fuse and it may be just that. If the fuse is ok then it gets a bit tougher. There are a series of diodes in there that are critical to the functioning of the TV, ditto some caps and resistors. It can all be checked if you know what you are doing.

 

I would take the back off and check the fuse.

 

Then report back and I will help you further.
-----------------------------------------------------------------------------------------------

Please also consider a BONUS. Thanks.

 

 

Steve G., Technician
Category: TV
Satisfied Customers: 16906
Experience: VP of electronic repair company. Audio nut.
Steve G. and 3 other TV Specialists are ready to help you
Customer: replied 6 years ago.
I got the back off of the TV.There are no visible signs of any burnt components nor any smells of such. About the main fuse would it be right off of the power input, i see what looks like a fuse or a filter wraped in heat wrap. then It goes to a large circuit board with large coils and some cooling fin stacks. Is this the board the main board or a power supply?
Customer: replied 6 years ago.
can you still help me or was the $15 for that one question?
Customer@yahoo(dot)com
Thanks
Expert:  Steve G. replied 6 years ago.

Yes, I am here. A little tired :)

 

The fuse should be right there near the power input. SHould be a regular cylindrical fuse.
-----------------------------------------------------------------------------------------------

Please also consider a BONUS. Thanks.

Customer: replied 6 years ago.
there are three small ones that i see. these fuses test fine.
Expert:  Steve G. replied 6 years ago.

I see. Are you able to check other components in the PS? Resistors, diodes?

 

Do you have a multimeter?

-----------------------------------------------------------------------------------------------

Please also consider a BONUS. Thanks.

Customer: replied 6 years ago.
yes i have a multimeter. should i begin testing components with the power on to the set? should i just place the ground lead on the input ground and follow the components with the other lead?
Expert:  Steve G. replied 6 years ago.

No. Turn off the TV for now and unplug it. Wait 5 mins before diving in there.

 

Stick to the PS for now. Check everything you can. Resisistors should neither be open or shorted - they should show a resistance.

 

Diodes should check very low resistance in one direction and high in the other. Visually inspect the capacitors for leakage or bulging tops.

 

Check everything you can.

 

Then take a look at the back of the TV and tell me if this model has a label in one of the corners with test voltages on it.
-----------------------------------------------------------------------------------------------

Please also consider a BONUS. Thanks.

Customer: replied 6 years ago.
i have a sticker showing input ratings from 100-240v. But can not find anything about test test voltages. I''m going through the components now. i really appreciate you time and will do my best to make it worth your while.
Expert:  Steve G. replied 6 years ago.

The label may be on the inside of the back cover.

-----------------------------------------------------------------------------------------------

Please also consider a BONUS. Thanks.

Customer: replied 6 years ago.
I believe I have found it.
Va=70 Vsc=-190 Vs=207 Ve=84 Vset=190

how do i test these?
Customer: replied 6 years ago.
I have found where i can test these voltages. i do this with power on the unit correct?
Expert:  Steve G. replied 6 years ago.

That's it. Be really careful.

Let me know.
-----------------------------------------------------------------------------------------------

Please also consider a BONUS. Thanks.

Customer: replied 6 years ago.
I found Va, Vs, and Vset all to be at their test voltages.
i am un able to locate Vsc and Ve. I will continue to look.
From what i am able to see the PS seems to be ok.
Customer: replied 6 years ago.
The green led lights do light up on the main board after the PS. they indicates S5v, +5v and +12v
Customer: replied 6 years ago.
After the Power supply, wire harnesses branch off into one large board in the center of the set, then there is another board behind this one which branches off with ribbon cables to the two boards on the left and right side. Can you tell me determine what these boards are called or how to identify which is which?

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)