Question about Toshiba Projection Televisions

12 Answers

My 42h81 toshiba lcd tv went black after a clicking noise with my power indicator light flashing there is no sound I unpluged the tv and then repluged it but no result. What could be wrong and how much to repair it?

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  • jnkunec Jul 20, 2008

    You have offered no solution Just give a possible reason why my toshiba 42h81 went blank after a clicking sound with no sound and the power light is blinking .I unpluged the tv overnight and pluged it agan but no solution

  • jnkunec Jul 20, 2008

    My 42h81 toshiba is a lcd tv I donnot believe it is a rear projection one

  • jnkunec Jul 20, 2008

    If the convergence ic are gone wouldnot your sound continue to work

  • jnkunec Jul 20, 2008

    I will restate my problem as clearly as possible my toshiba 42h81 lcd clicked and went black with no sound or picture the remote does not work and the only thing that works is the red blinking light on the power source the manual power switch does not work nor do any of the options on the remote.

  • jnkunec Jul 20, 2008

    where do you find the f850 f851 f470 and f890 fuses for my toshiba 42h81 tv

  • jnkunec Jul 20, 2008

    are there any fuses on my toshiba 42h81 tv where are they found

  • jnkunec Jul 20, 2008

    Please answer the previous questions

  • jnkunec Jul 20, 2008

    I already tried unpluging and pluging it after soom time 8 hrs. just a clicking sound to start of and then the red light in front of the tv blinking and none of the switches in front working nor the remote

  • jnkunec Jul 21, 2008

    my 42h81 toshiba tv made a clicking sound and then went blank with the front power red light blinking no sound no remote only way of stopping the red light was to unplug Could it be a fuse where is it ant ideas thanks

  • jnkunec Jul 21, 2008

    From the last comment I have to conclude that none of the answers provided any insight into anything not even if the tv has fuses and where they are located

  • jnkunec Jul 21, 2008

    Ofcourse its a hardware problem still havennot answered the question if the tv has fuses

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12 Answers

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Such symptoms comes only if Power Supply becomes bad or LCD Panel got defective. In either case, You have to contact concern service center for proper repair. Its not matter to handel it at home by yourself.

Posted on Jul 21, 2008

  • Shahid Electronics
    Shahid Electronics Jul 21, 2008

    Attention to all who says Convergence Problem, Let me tell one thing, there is NO Convergence Section in LCD TV.

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Hi-

Hi chances are you are having a bad mainboard for your TV, you can only access it by opening the TV so that you can check on it, before you do that check the warranty status of your television first so that you wont void it if you open it up, and suggesting that you have it check by an experienced technician. Thanks for using Fixya!


Posted on Jul 21, 2008

  • Edgar Allan Pagayona
    Edgar Allan Pagayona Jul 21, 2008

    Hi-

    No it doesn't have one that you can replace instantly since the fuse is on the board connected.


  • Edgar Allan Pagayona
    Edgar Allan Pagayona Jul 21, 2008

    It doesnt have a fuse

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This is hardware failure in your Tv , you need to give to local service center for repair it will cost you $150 to $500 depending upon the problem......




Good luck.....

Posted on Jul 21, 2008

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Hello,

You TV now require a TV LCD specialist to personally check all the parts inside. My final diagnose is the power input of the tv cannot regulate the correct voltage to project the picture on the screen. so if the power input is in correct out put you need to isolate some parts and test it using multimeter or any specific tools for testing in the capacitor, regulator and some other resistor and diode. when resistor burnout means that there is a short circuit either in regulator..

But for most effective solution is to let check the TV personally by electronic tech.


melnavz

Posted on Jul 21, 2008

  • Emelio Navaja
    Emelio Navaja Jul 22, 2008

    Bring the LCD to the qualified electronic repair for best result. or call TV service center in your area.



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Power Supply Details
The defective power supply module will cause the following symptoms:
*No Display and no Sound, Then Power indicate light changes from Green to Red.
No technical skills require to perform the replacement. Anyone can do it. It is easy, economic and convenience to repair LCD TV

Click this site for replacement power supply assembly;
www.MONISERV.com


Good luck and thank you of using fixya;







Posted on Jul 21, 2008

  • LORETO LACARON
    LORETO LACARON Jul 21, 2008

    > Hi everybody!
    > > Hope someone has encountered a disaster that I
    > have with a Toshiba 42H81
    > blowing a 5A fuse.
    > > Sent to a home outside of Philadelphia with the
    > complaint "red light
    > blinks only". Found F850, F851 (5amp fuses),
    > F470 (2A) and F890 (3.15A) all
    > blown. Carefully checked for ANY defective parts
    > and found NONE (quite a
    > surprise when 4 fuses blow). I replaced all 4
    > fuses and held my breath..
    > TV immediately came on with a great picture which
    > really was a surprise!
    > Since there have been so many electrical storms
    > around I was hopeful.. 2
    > days later customer called and said "red light
    > blinks only". I expected to
    > find all the fuses blown again but only F850
    > (+16V) had blown. When I
    > replaced it the set immediately came on but I
    > "knew" there was no way it was
    > only a bad fuse. I pushed the service manual cd
    > in my laptop and found that
    > F850 and F851 both fed the 2 convergence IC's. I
    > replaced both and really
    > did not expect to hear from the customer again.
    > Surprise..2 more days and
    > "red light blinks only". I'm planning on driving
    > back tomorrow but I would
    > appreciate anyone's th
    > > oughts on this. Set cannot be removed from
    > home in this case so I will
    > certainly have to figure it out there.. I have
    > had some new bad
    > STK392-110's in the past but it seems unlikely
    > but any ideas are helpful!

  • LORETO LACARON
    LORETO LACARON Jul 21, 2008

    The fuses are near around the convergence section.
    click below a picture guide sample of convergence STK..

    http://cmpalmer.blogspot.com/2006/11/fix...


    http://www.repairfaq.org/sam/tvfaq.htm#t...

    hope may this help;

    Good luck, and thank you in using Fixya;





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Try doing a hard reset to the unit,,, unplug the unit for 3 hrs and then reconnect it back then tell me the status.

Posted on Jul 20, 2008

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Hi there this monitor must give us a code variable there is an auto service directory if its the us model so press these buttons on the tv to enter blinking code hold a convergence down for 4 seconds while you strt up set the flashing led on the front of set will indicate fault code ok count the flashes then go online and google lct monitor fault codes and you will locate the problem its a good way to start

Posted on Jul 20, 2008

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Most LCD faults are of two types
1 Dead (Psu faults)
2 Display Panel Faults

Posted on Jul 20, 2008

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 20, 2008

    The Psu are Just like any Psu using SMPS (chopper), so use normal PSU fault finding techniques
    Start with , Any power from secondary of chopper transformer, at the diodes)
    usual PSU voltages are 5v,3.3v 12v (the 12v feeds the CCF tubes power generators)
    If yes the psu ok, If no check for 320v across mains smoothing capacitor.
    If 320v ok but no output, check for shorts on the output lines (schottly diodes)
    If the PSU is running and there are any leds glowing on the front
    check to see it the flurecent tubes (on each side) are glowing
    they usually have their own supply generators powered by 12v from PSU




    All faults that are within the panel aren't repairable (Specialist repairs are possible , But the COST)

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I really think you have blown a fuse inside for the sound

Posted on Jul 20, 2008

  • chris07551 Jul 20, 2008

    well u have a power supply issue now u may have blown the power box inside

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Sir,

This is the problem of convergance. U must replace the convergance IC's then the problem is solved. Go to the authorized service centre for replace the convergance ic's.

Thanks

Don't forget to rate the solution

Posted on Jul 20, 2008

  • Asfiya Ahamed
    Asfiya Ahamed Jul 20, 2008

    Dear Sir,

    There are two main power supply capacitors in this set. they are C-809
    and C-810. One their negitive lead on the printed circuit boar, you
    may need to repair the area, and resolder that lead also. Because the
    factory left out a printed circuit board eyelet, the connection will
    come loose over time. Also be sure to check the fuse number F-860, as
    this will sometimes blow when these connection are bad. If you replace
    the fuse and the set works, you could be making a fire trap if you do
    not resolder these connections as they have caused some problems in the
    past, as this is why Toshiba has sent out a service bulliten on this
    problem. Now one thing for the both of you. If you do not have any
    solid stae repair experience, please play it safe and do not attempt to
    do this repair by yourself. Call in a pro to assist you as these
    capacitors may be floating from the printed circuit board and are fully
    charges up and can cause a seriuos shock to you. Bottom line? BE
    CAREFULL!!! Good luck and let us know how you made out with this
    repair.



    Thanks
    Good luck


    "Don't forget to rate the solution"


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The model you've provided is for a rear projection TV. The failure on Toshiba's rear projection TV is found most of the time in the convergence circuitry.
This ty
pe of repair is not a DIY, if you take the TV for repair it might cost you anywhere between $300.00 to $400.00

Posted on Jul 20, 2008

  • Jaime Hernandez Jul 20, 2008

    Can you check the specs on your TV and see if it's a LCD. I have the same model that is why I'm saying is a rear projection.

    Here's is the solution for you, replace the STK392-110 ICs and you will get the TV working again, you should know where locate them on the circuitry.

    Good Luck.

  • Jaime Hernandez Jul 20, 2008

    Click here for more info on what could be causing the TV not to work. Download the first PDF file when you open the link.

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Is there a light on the tv led, stating the it has a power... please add more info.

thanks

Posted on Jul 20, 2008

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