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 Anthony_Infotech Your Own Question
Anthony_Infotech, Technician
Category: TV
Satisfied Customers: 13147
Experience:  20+ years experience TV expert in the main
Type Your TV Question Here...
Anthony_Infotech is online now
A new question is answered every 9 seconds

Hi, I have a SHARP LCDTV LC-32SB24U with the green LED blinking

This answer was rated:

I have a SHARP LCDTV LC-32SB24U with the green LED blinking every second after I plug the power on plug. To turn it on, after I plug it in the power outlet, I press and hold the power button (it takes 5 seconds) until the power led becomes red. I release the power button and press it again. In seven seconds the screen lits up, shows Channel 47 in upper-right corner and after a second shuts down. After another 3 seconds I hear a click on the power supply board and the power led starts blinking green again.

The power supply board is RUNTKA397WJQZ, the main unit board is QPWBXE450WJN2. I have replaced the power supply board with another identical one purchased from eBay. The TV does the same as before, which leads me to believe that there was nothing wrong with the power supply board in the first place (or maybe both are fried). I have downloaded the service manual, as well as the firmware from Sharp.
Thank you.


Thanks for using this service

Welcome to JustAnswer


Theirs probably nothing wrong with that original powerpack

Its the mainboard also the part number for powerinverter was wrong too

Im afraid these things happen in tv fixing

Your going to have to replace it (firmware pre-loaded)

Maybe a google and search for this board might be a good idea?



Im not sure what they mean by this above as the bulletin says different?

Its very important you end up with the correct mainboard


Please post back if you have questions



Anthony_Infotech, Technician
Category: TV
Satisfied Customers: 13147
Experience: 20+ years experience TV expert in the main
Anthony_Infotech and other TV Specialists are ready to help you
Customer: replied 6 years ago.
Hi Anthony,

I really appreciate your fast answer. Please find attached two pictures with the powersupply and mainboard.

First is the mainboard -- QPWBXE450WJN2 or KE450XE450WJ:

Second is the powersupply:

The model numbers I listed in my original question are from these boards.
I have replaced the mainboard with another one, identical, same serial, but the TV was doing the exact same thing as above.

Is there a reset sequence I need to do? I have downloaded the firmware from Sharp, here and downloaded the service manual from here --
Thank you,



The photos are good

Them numbers on the boards unfortunately are not the part numbers as such

If you click on my links above they are the part numbers them are like a reference code(on the panel)im not sure why Sharp do this as I have noticed this on virtually every panel I have fitted that them numbers dont tally up

I have had both of these boards fail on occasion and you have done the right thing it could have been one or the other,the power one has the combined inverter

It looks like the right firmware you have as this firmware is in other models too its firmware version 1.13

I thought you changed the powerinverter board? in your first comments


Im afraid their isnt any other way other than to change the main board firmware pre-loaded in other words their is no reset

It will be the firmware gone down but it can only be re-loaded now in a jig with specialist programs on a laptop so another board will get it on that board may be repairable by its worth ringing them to find out


Hope this helps



Customer: replied 6 years ago.
Anthony, sorry for the delay.
I will call them tomorrow, tonight is too late they left for the day.
Thank you for your patience.



OK worth a call they do a lot of mainboards



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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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
< Previous | 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:

  • Louie



    Satisfied Customers:

    25+ yrs. experience in the field and 5+ yrs. online, down to component level.
< Last | Next >
  • Louie's Avatar



    Satisfied Customers:

    25+ yrs. experience in the field and 5+ yrs. online, down to component level.
  • Rod's Avatar


    TV & Communications Sys Repair

    Satisfied Customers:

    FCC Commercial License, Previous owner of Electronics Repair shop, 40+ years in electronic systems.
  • Pete's Avatar


    Electronic Engineer

    Satisfied Customers:

    Over 16 years of experience installing and repairing electronics.
  • Steven's Avatar



    Satisfied Customers:

    Ma. Master Technician Lic. Authorized Warranty Support.
  • euro-pro llc's Avatar

    euro-pro llc


    Satisfied Customers:

    20 years in TV repair,certified by all major brands- Sony,Samsung, LG,Toshiba, Panasonic, RCA,
  • Daniel's Avatar


    Electrical Engineer

    Satisfied Customers:

    BSEE (Electrical Engineer), 10+ years electronic design experience ,chip, board, component expert
  • Conrad's Avatar



    Satisfied Customers:

    Training on many types of consumer electronics, training on Sony Samsung and JVC