Question about Toshiba 65HX81 65" Rear Projection Television

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Power button blinks and there is no picture - Toshiba 65HX81 65" Rear Projection Television

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  • billmccurdy May 06, 2010

    do I need to take the back off and were is the chip located in the tv

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The most common reason for this in this model (model indicated is 65HX81) is one of the two STK-392-110 Convergence chips is shorted and has taken a protection part out. The set will instantly detect a missing voltage and shut down. There are a few easy ways to try to prove if this is the case or not. A lot of this depends on your skill and if you have a volt/ohm meter. If I was looking at the set (I have fixed hundreds of them) I would first look for the two pico fuses that protect the chips mentioned. All these sets produce two voltages in the power supply and one is a + voltage (22-30 volts) and the other is identical but a - or negative voltage. In the model indicated each is protected by a pico fuse (does not look like a glass fuse but in these sets is usually a 5 amp device and I can supply photos of what they look like.) If either of the fuses was blown it means one of the two chips got it. The other clue would be to carefully look at the group of gray resistors in front of the two chips and check them with a ohm meter--like testing a fuse--they are fast acting and usually not burnt but if no reading across one of them you have found your problem. If the fuses indicated are good I would test for voltage on each and if it is good and the resistors around the chips are good you have another problem. Fixing sets is all about trying to narrow down where the problem is and then zero in on it. This is the most common problem and it should be examined first. Let me know your skill level--I am in California and usually here from after 3 pm to after 8 pm every day PACIFIC time. I am here to help you. Feel free to ask me any question as there are no foolish questions-- SD TECH

Posted on May 06, 2010

  • SD Tech
    SD Tech May 06, 2010

    yes, you will have to remove the back cover of the set and do much more to get at the chips. I will enclose/attach a photo of what the chips and the fuses look like--fuses may be a different color but usually will be on board on far left as you look from the back. The two chips are usually on two metal heat sinks with fins near the middle of the set on the board on the right.

    You do know how to test and have a meter to do this?

    It is not rocket science but you will not be able to tell if the fuses or resistors are bad by looking at them--it does not work that way. What is your skill level or experience?

    I never know what level of skill someone has unless they tell me--I have helped people who ranged from novice to electronics engineers.

    Note: One photo will show what the chips look like, a second what the fuses look like (should be orange or green in color) and a third will show what the metal heat sinks the chips are bolted to look like--it is a different brand but you will know what to look for.

    SD TECH.











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