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?????
An expert who has achieved level 2 by getting 100 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
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).
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
I have same model. First set went out of convergence, and I was able to adjust it. A few days later I had same problem and fixed it again. Then I was no longer able to adjust it. I watched TV the way it was. The picture got darker.Then I was watching TV, and there was a flash from the middle of the picture, and TV powered itself off. I unplugged TV and plugged it in 30 seconds later. I powered TV on, and red LED on front panel blinked a few times, and stopped. TV powered itself off.
From what I learned, the LAMP has to be replaced, and so do the convergence chips and convergence resistors. The TV shop charges around $300 and up just for the convergence chips. The TV is selling on craigs list for $150 to $200 in good working condition.
You have to decide if the repairs are worth your while. Probably not in mmost cases.
Could be a bad spark gap on the ballast board. Should have a tech come in a do some Hv testing to see whether the ballast should be replaced, could make the difference on getting the lamp to last 1000 hrs or 3000 hrs...
I would suspect that the shutdown circuit is triggering. Have you checked the HV anodes of the CRTs to see if the voltage is fluctuating? In addition I would check the Horizontal output transistor and the Power FET in the switching power supply. The fact that you removed the blue CRT and put it back and the problem seemed to go away points to a possible cold solder joint which could have this effect also. There are a number of things that could be wrong, Here is a list of some of them that you can check:
1) Faulty component on power supply board (check capacitors for problems) 2) Faulty connection on power supply board (check for cold solder joints) 3) Faulty component on Deflection of HV power supply board (check for bad capacitors, zener diodes, Horizontal Output Transistor, and Integrated High Voltage Ttransformer) 4) Faulty connection on HV power supply board (check for cold solder joints) 5) Faulty CRTs (check anode voltages, remove anodes from CRTs and see if the set remains on, if so check for shorts on the CRT socket board or using a CRT analyzer check for internal CRT shorts)
You need the HV splitter. You can leave a email at the following link state your model number and let them know you need a HV splitter. They will respond quickly to your inquirery and they will provide free tech support to explain how to change the part. http://servicemanuals.vstore.ca/
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.