Sanyo TV, model DS31650, suddenly has no power. Sanyo customer support suggests that it needs a new fuse. Sounds simple enough, except which one of all the thingys in the back of the TV is the fuse? What does it look like, should I be able to replace it myself, and where would I get a repacement? Home Depot? Best Buy?
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Check and replace damaged component/s at its main power supply regulator stage [SMPS] circuit. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
there is an SIF coil (sound-intermediate-frequency) that goes bad on these units. it will be near the video jungle ic and marked sif on the board. since your sound is poor anyway you could try to adjust, in very small incremens at a time to see if audio picks up. sometimes dirty connections in the coil will cause poor conductivity, by turning this will move contact to new position mch
If the set runs at all, your flyback and output transistor are good. If the set shuts down after a few seconds and the sides are wavy, it usually means that the main B+ in your power supply is too high and not regulating properly. I do not know what kind of power supply that model uses, but if has an old-style STR regulator (like the STR30130) then it is probably shorted, and if the set uses a switching power supply then look for an open or leaky electrolytic cap on the primary side. If the power supply is working correctly and the set shuts down, check for an open safety cap (the large 1.6 - 2Kv cap connected to the collector of the horizontal output transistor).
It sounds as you desribe, the vertical output IC and or the b+ feed capacitor off the Hi voltage transformer feeding the vert. IC its required voltage. Not a really hard job to replace, but not for a handi person to do. This should be left to the professional, as there are no user serviceable parts inside this set and with the HI voltage and the safety issues its best to call somesone to assist you with this repair. Good Luck