As a science and tech nut decided to take on the tv for learning experience.my problem and what i have done..
1-typical power-on seconds later HV shutdown
2-replaced Horiz Out Transistor
3-it worked!,but, width became wavy and HV
shutdown after 45 sec.Had trouble
adjusting white balance.
4-replaced flyback transformer. improved
white balance, still shutting down
5-voltage checks in multiple points on board seem to all be around 2x listed rating of said points. suggestions?????
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Re: Sanyo DS31650 31
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).
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This is another typical issue with power supply boards. You need to have a qualified tech look at this and determine which board is bad, but it points to the power supply, they get the hottest and burn out the earliest.
Sally, You or hubby or boyfriend will need to investigate the internal "switch-mode-power-supply" because it may be going into "shutdown mode" because it has detected a "fault condition" with itself or another periferal electronic circuit. If not into DIY repair, I suggest contracting out the repair work. Before you do that, a visit to YOUTUBE will help. Search out similar or same size Sanyo model there and here at fixya for any history of typical "black screen of death" symptoms that may be the same as your unit. After your research is done return to this posting and provide us tech's more info and what you intend to do about your sanyo unit. 12fixlouie
Found 1 of the 2 ac supply ( 8amp) fuses blown on the main pwr. supply. Replaced fuse and good so far. Looked over the ps for damaged components, none found. Checked current with ampmeter with tv on, showing 3amps.
You problem is in the power supply. I am an authorized tech for Sanyo, and in the Chattanooga TN
area. Contact Sanyo at 1-800-877-5036. At the prompt hit the 0 key, and
then ask for customer service. They will be more then happy to assist.
You could have a power supply problem or a sweep supply problem. If you have had any TV repair experience, you will need to get a schematic and go from there. if you have not and still want to learn, Please read the article im posting for you. A tv set is not a place to be poking around in if your not sure where to poke. Good Luck
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Typical relay power problem on these sets for the relay power. most of the time, its the capacitor in the standby power supply that supplys the main 12 to 15 volts to the relay for the main power supply.. Problem is it is not a repair that can be done or understod by a layman in electronics. its a repair for an experienced tech as a TV set is not a place to be experimenting in.