Question about Televison & Video
This is a classic "Hic-upping" switchmode power supply problem. The protection circuitry inside the SMPSU, has sensed a severe potential problem, and is attempting the shutting of the set, down to avoid a fire, explosion, or both. Although it is evident that you may already have had the explosion... Any explosion, always has a bad consequence, and destroys the component(s) concerned. there is also frequently, "Co-lateral" damage, caused by the failure...
This set had developed a problem, that is so severe that the set must be shut down, (This set should be removed from the Power),
What is happening is the internal "Fault" that is causing the Protection Circuitry , to detect the problem and attempt to shut down the set, keeps restarting the set, because as soon as it shuts down, the "Faulty" component(s) cool down?, and the "Fault" ostensibly "Clears" so the PSU starts up again, only for the component(s) to heat up, whatever, again and fail, so it shuts down, and if left unattended, this would continue on until the part eventually failed. As related this is called a "Hic-upping Power Supply". Any fault that involves the power supply is usually quite serious, and needs a professional, usually, unless one is familiar with servicing current day, televisions.
And in my professional recommendation, you should get a "Quote" for repair, from, an, Approved Service Center. Now, this point is very important for a good result, Always contact, their "Local" or a, "Head Office" Sanyo in your case. Ask them, for a referral to an authorised servicing center, where you ask for a "Quote". Now, when you get the information you want, then you can decide as to repair of replacement.
The reason we want an approved agent, is that way, all the engineers are trained on their own brand sets, they have seen almost all faults, and will get the job done quicker, and for less cost, and usually have parts on hand, also sometimes, there has been a service bulletin in issued and the repair may be subsided or even free. There are many, many, many reasons that display this symptom, one must work through the troubleshooting steps to isolate and identify, the Cause and repair that and any damage done.
Unless one has money to spare, hours to spare, access to a service manual and spares, plus the required aligning, programming & servicing equipment & knowledge.. DIY service of these sophisticated computer controlled digital receivers, ie: The TV, is in reality rather impracticable.
These sets are often a challenge for even qualified engineers, and things can actually be made worse by inexperienced DIYers, say doing something as simple as doing a setup step out of order.
Posted on Mar 19, 2011
You have not mentioned if this is a rear projection set, meaning has pictubes, but from the discription you are giving i am asumming so. Check the High Voltage retrace scan Capacitors near and around the Flyback Transformer, also the Flyback could be arching inside of its casing. It is best to change the flyback transformer and the horizontal output transistor, they work in conjunction with each other, The H.O.T is mounted on a heatsink in the same area of the transformer. You might also try checking the High voltage spitter this device seperates the high voltage from the flyback to all three tubes.
Posted on Mar 19, 2011
You haven't specified anything about your TV in your post; that i means, its brand name and model number etc; Please provide these to me by Fixya, and it will help me to detect the fault, and help you. The model number is important as well as brand name. Give me some details about what you have done in it till now, and which componets has been replaced. OK.
Posted on Mar 19, 2011
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Posted on Jan 02, 2017
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