The LED comes on and blinks three times. No power, but I can hear the high voltage flyback at startup. I suspect one of the low-voltage supplies. This set has a half dozen low-voltage regulators. I guess I'll have to purchase the service manual. Anyone have a solution?
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The hissing sound could be high voltage leaking from a tripler. Observe in a dark room for blue arcing. Look at tripler and connections to the projection tubes. If the tripler is leaking replace the tripler.
look for trouble in the low voltage and or high voltage power supply circuits. the popping sound could be an exploded safety capacitor in the horizontal output to the flyback transformer. the horizontal output transistor maybe damaged. chances are the low voltage regulator is also damaged.
There are three main reasons that convergence can still be inoperable after replacing the convergence amps. One, when the amps failed they blew the fuses protecting the power supply from shorts. Two, when the amps failed the yoke return biasing resistors burned open. And Three the Digital Convergence Unit has failed. Once things have gotten to this point it is usually time to have a professional have a look at the set.
Replacing a flyback is not something I would suggest for anyone with no electronics experience. Second, lets see where the noise is coming from first. Take off the back and listen to the noise. The flyback will be at one end of the large red wires that go to the tubes. Sometimes the connection at the tube is not 100% and the noise comes from there. BE CAREFUL - there are high voltages going through this red wire that can be dangerous even with the set UNPLUGGED!! IF the noise is coming from the connection at the tube, with the set unplugged, carefully turn the rubber cap back and forth touching only the rubber part with one hand. Put the other hand in you pocket while doing this.
If the noise comes from the flyback side, if you can solder, again with the set unplugged, try resoldering the pins on the transformers. That may resolve the problem.
Not simple at all it require a Technician yes it very common problem in the high voltage output you can replace the whole printer circuit board but it require to adjust a few thing after replace the new PCB such high voltage for 3 picture tube and convergence
Part No. is BP94-01249G or L
Not sure of the part number most use STK392-110 or 120s . You will need to look at the ics in your set they will have the IC numbers stamped on them they will have STKxxx-xxx whatever that number is thats the sanyo part number for those ICs