Question about Toshiba TW40F80 40" Rear Projection Television

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Tv not powering up

Red light come on but blinks,no sound and no picture

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  • tkasza00 Nov 28, 2007


    I have a Toshiba TW40F80 in which the power indicator light blinks and I cannot get the TV to turn on. I have been reading up on some of the previous advice given on replacing the Convergence ICs P/N#STK392-120 from Sanyo. I am trying to reference in the USer Manual were these ICs are located on the PCB and I have taken off the back panel of the TV but cannot seem to find a good starting point. What is the easiest way to replace these ICs and were can they be found? I appreciate the help!



  • Anonymous Mar 27, 2009

    nothing response, the red light keeps flashing



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You likely have bad convergence ouput IC's that have caused a fuse to blow.  The IC's are fed with a +27v and a -27v and the fuse for one of those supplies is likely open.  If so you will also need to replaced the convergence output IC's type #STK392-120.

Posted on Oct 23, 2007

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Check micro fuses in power supply,Ex. F851,F852,etc.
Common cause is convergence IC's are bad,located on large heat sinks.let me know....T.

Posted on Oct 23, 2007

  • Vista Electronics Oct 27, 2007

    Careful-be sure to use the correct replacement IC's ----
    STK392-120's are used in a few Philips models---take a look
    at the number on the IC's and let me know....T.



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SOURCE: TV on/off light keeps blinking red light/no sound or picture on screen

Here's a solution that I received from an TV expert in another website: "This sounds like a power supply problem. i have seen it several time on your model. i would not keep trying to turn it on it might damage something else in the tv. the reason it is shutting off is because the power supply is putting out too much voltage. a repair cost will range around 300-400. this is a great model and well worth a repair. here is a web site that might help you in finding a repairman." <-- $300-$400 is too much! But throwing away a 300lbs TV will cost a lot of $$$ for the towing and dumping too. I haven't decide what to do yet.

Posted on Dec 19, 2007

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