Question about Toshiba 65HX81 65" Rear Projection Television
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
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Posted on Jan 02, 2017
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