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Sharp TV Model 32SF56B will not stay on. It powers up for 5 to 10 seconds then shuts down only to try and restart again and then the cycle repeats. I have a schematic and con do some basic trouble shooting. No electronic tools.

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  • echeinrich Sep 13, 2010

    Give me 24 hrs to pop this baby open and take a look inside. I am not real happy about the "go find a repairman" solution. I had copy of repair manual with schematics before I contacted you folks.

    What I am looking for here is some experienced guidance in focusing in on possible causes -- most probable -- etc.

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A schematic witth no electronic tools is a disadvantage. I would prefer that you must a have a mutlimeter to check basicc voltage conditions for the possible fault.
1. Check the Power supply voltage, see the +B, the +5 to the processor.
2.make sure that there is no component that is heating up in a hurrry. If so discconnect and check for short or check if the set powers up.
3.Check the voltage on the processor controller using the schematic , see for the trigger volatage and feedback.
4. While shutting dwon and restarting look for the voltage build up in the output sections, if there is a good loss then disconnec the section to test if the shunting stops,
5.During the period of the shunting do you get the picture on the screen , if yes then check for faulty storage electrolytic capacitors.
6. If no then check for fault in the Y-processing stages.

Posted on Sep 14, 2010

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This is a classic switchmode power supply, shutting down to avoid a fire, explosion, or both. This set had developed a problem, that is so severe that the set must be shut down, This set should be removed from the Power, and in my professional recommendation, you should get a "Quote" for repair, from, a, Sharp, Approved Service Center, this point is very important for a good result, Always contact, their local, Sharp in your case, Contact, a "Head Office", or an Agent. Now, when you get the information you want, from the "Quote" well, then you can decide as to repair of replacement. The reason we want an approved agent, is that way, all the engineers are trained on their own brand sets, they have seen almost all faults, and will get the job done quicker, and for less cost, and usually have parts on hand, also sometimes, there has been a service bulletin in issued and the repair may be subsided or even free.
If you wish to DIY, (NOT really recommended) I have included a link for your service manual.
I have found a link for a service manual, below.
http://www.eserviceinfo.com/index.php?what=search2&searchstring=tv-sharp-32sf56b-gb-3d.part1.r
Another copy here, in case top link is bad, whatever. http://english.electronica-pt.com/electronics-search.php?find=32SF56B

Posted on Sep 13, 2010

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