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Re: TV Cuts off
Appreciate the "Ask Me". With your permission, I would likewise be posting this reply in your original post here.
Repairs of course would require familiarity with electronic circuitry and components, use of a DM and a soldering iron and access to to a service manual or at the very least a schematic diagram with voltage measurement.
Assuming the above and you are considering a DIY (do-it-yourself), perhaps the easiest and fastest would be to do a shotgun approach, i.e. open the unit and re-solder most of the solder joints with particular attention to the power components such as resistors, transistor, ICs, transformer (including the FBT). Of course one can never be sure which really is defective but the objective is to repair with no in depth diagnosis. Another component type to check would be the big capacitors right after the diode(s). Look for any visual indication of bulging/blistered, leaky or anything out of the ordinary among the power capacitors (and even the other components), if found/yes, then replacement(s) would be needed.
Other than the above, further diagnosis requires that you operate the unit with the back cover off and determine if it is heat related. This could be done by powering the unit, wait the 75 seconds, quickly unplug and feel for any component that heated up. There might be a different smell to it also. Of course safety precautions when working with live sets and/or units just unplugged must be observed.
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Your TV need a through check-up. Contact any service technician. Burning smell should be due to any short circuited component/s; either its main power regulator section circuit, or, horizontal output section circuit. This is not a user repairable fault, need some practical experience to do repair work. To get some details, http://electronicshelponline.blogspot.com/ Pull up older posts
Sounds like the power supply has copped a mains-borne surge. Replacing the fuse doesn't always fix it unfortunately. The cost to repair the switchmode PSU depends on how many components have been affected within it and the extent of the damage as a result of the surge. If the damage is serious, for example burn marks/large cracks on the board, and the optocoupler is destroyed, the whole set would be uneconomical to repair.
You can never predict when or where a power surge is likely to strike.
Looks like the flyback (high voltage transformer and probably the majority of the power board is kaput. It would be cheaper and probably worth your while to invest in a new TV rather than try to fix this one..
it might be due to speaker.
if it is ok then check for
1 loose connection in sound section.
2 speaker wire loose.
3 any capacitor in sound section might be faulty.
4 check supply to sound section
5 loose connector in sound section.
6 sound ic might be defective.
if not tech.person take help from tv tech.
hope this will help.
it was not necessry to replace so many parts if you go as per proper procedure.please proceed as
1 isolate horizontal output section
from power supply & make power supply ok.
2 if it becomes ok check hor osc,driver&h/output section.
3 if it is ok connect power input to hor.section which was isolated.
4 check for loose contact or print.
5 put on tv .
If you had a burning smell, well the board is toast. These sets are made to replace the entire board at one time. Before installing the replacement module, the picture tube should be checked. A defective picture tube ( such as a G1 short) may cause a failure in the power supply section.