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Dead set, have checked fuses diodes and resistors in power supply and cannot fix

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Hi,

tv's are good for around 10 years. then they start to have problems. it does have a fuse in it you might want to check, but in most cases i would say the power supply in the tv has gone bad. it is hard to say without testing some voltages in the tv. if i am right a repair will cost around 200.00. i would not put this type of money into a tv of this age.
good luck :)
let me know if you need more info??

Check the owner's manual before consulting other sources. Often, the possible problems are laid out right there, along with a troubleshooting guide.

  • Step 2 See if the television manufacturer has a Web site with troubleshooting tips or FAQs.
  • Step 3 Check all the connections - AC plug into the wall, cable television connection, input and output cables to other machines such as VCRs. Unplug or disconnect them, then plug them in again.
  • Step 4 Look in the fuse/circuit box to see if the switch for the television's room is flipped, meaning that a fuse blew. If it did, flip the switch back to reset the fuse.
  • Step 5 Check the remote control and replace its batteries if necessary.
  • Step 6 Adjust the television controls, following advice in the manual. Incorrectly set controls can cause problems like sound but no picture and picture but no sound.
  • Step 7 Test the setup of the cable television or VCR hookups by referring to their manuals. If you can identify which item is causing the problem, you can call the company's customer service number and talk with a technician.
  • Step 8 Clean the parts of the television that are visible, but don't dig into openings. Make sure the television is unplugged from the outlet when you clean it.
  • Step 9 Double-check the antenna if you have one. Replacing it or pointing it in a different direction may help solve the problem.
  • Step 10 Take the television for professional service, if necessary. It's better than nullifying the warrantee or ruining the machine by attempting repairs yourself.

  • Thank you for contacting Fixya.

    Posted on Jun 02, 2009

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    Sony kv32v15 is dead with no sounds are lights. How difficult is it to replace the power supply / power management components?


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    Hi,
    Components on the printed circuit board are still faulty, you need to carefully check the components on the board with the use of an ohmmeter.
    Do follow the below procedures to enable you repair your television.
    The click probably means that the power relay is working, though there could be bad contacts.

    Since the fuse doesn't blow, you need to check for:

    Other blown fuses - occasionally there are more than one in a TV.

    Replace with one of exactly the same ratings.

    Open fusable resistors. These sometimes blow at the same time or in place of the fuses. They are usually low values like 2 ohms and are in big rectangular ceramic power resistor cases or smaller blue or gray colored cylindrical power resistors. They are supposed to protect expensive parts like the HOT but often blow at the same time.

    If any of these are bad, they will need to be replaced with flameproof resistors of the same ratings (though you can substitute an ordinary resistor for testing purposes). Before applying power, check: Rectifier diodes, horizontal output transistor, regulator pass or chopper transistor (if present), and main filter capacitor for shorts.

    An initial test with an ohmmeter can be done while in-circuit. The resistance across each diode and the collector to emitter of the transistors should be relatively high - a few hundred ohms at lest - in at least one direction (in-circuit). If there is a question, unsolder one side of each diode and check - should be in the Megaohms or higher in one direction. Removed from the circuit, the collector-emitter resistance should be very high in one direction at least. Depending on the type, the base-emitter resistance may be high in one direction or around 50 ohms. If any reading on a semiconductor device is under 10 ohms - then the device most likely bad. Assuming that you do not have a schematic, you should be able to locate the rectifiers near where the line cord is connected and trace the circuit. The transistors will be either in a TO3 large metal can or a TOP3 plastic package - on heat sinks. The filter capacitor should eventually measure high in one direction (it will take a while to charge from your ohmmeter). It could still be failing at full voltage, however.

    If you find one bad part, still check everything else as more than one part may fail and just replacing one may cause it to fail again.

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    Other possible problems: bad hybrid voltage regulator, bad startup circuit, bad standby power supply (dried up filter capacitor, etc.) bad relay contacts as mentioned above. However, these probably would not have blown the fuse in the first place so are less likely.

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